Y Combinator

Repl.it lets you start coding in your favorite programming language in 2 seconds; it lets you build and deploy apps right from your browser. The founders wanted to build something to solve their own problem -- back in school they were tired of setting up their development environment on every machine they wanted to code on, and they dreamed of a world where you could just open a tab in the browser and start working. They built Repl.it to give developers access to simple, powerful tools and a community of hackers, aspiring programmers and teachers. They make it possible to learn, practice and build, all in the same place.

Deepnote is a collaboration platform designed specifically for data scientists, founded in 2019 and headquartered in Prague, Czech Republic. The platform provides development software that facilitates real-time collaboration among users. Key features include versioning, code review, and the reusability of algorithms, which enhance the efficiency of data analysis projects. Additionally, Deepnote offers tools such as variables and plots, code intelligence, shortcuts, and a command palette, along with capabilities for creating dashboards or APIs. This combination of functionalities aims to streamline the workflow of data scientists and improve the overall quality of their work.

Codex is a dev tool that enables just-in-time documentation for deep collaboration. Codex is a code collaboration that answers the burning technical questions in a given database, right in IDE.

Emerge is building tools to monitor and reduce app size. Their actionable insights provide instant savings, while their continuous monitoring helps developers write smaller, better code by profiling binary size on every pull request. Bloated apps have a lower install rate and higher uninstall rate, leading to decreased customer engagement and ultimately revenue loss.

Gallery lets engineers spin up fully-featured cloud environments instantly on their own clouds, regardless of cloud provider or environment architecture. Engineers use Gallery to speed up development and share feature previews with QA and clients without spending hours maintaining custom DevOps workflows.

Codex is a dev tool that enables just-in-time documentation for deep collaboration. Codex is a code collaboration that answers the burning technical questions in a given database, right in IDE.

Bloop.ai is an extension for a code editor that surfaces code examples from each library’s official documentation.

Evidence is a developer of an open-source business intelligence platform that allows analysts to create reports and dashboards using a markup language. This innovative approach enables users to establish a trusted, version-controlled reporting system, enhancing the reliability and consistency of outputs. The platform's superset of markdown includes a growing library of components, such as charts and graphs, which support SQL analysts in delivering comprehensive business insights. By moving away from traditional drag-and-drop interfaces, Evidence's solution empowers users to efficiently build and manage their reporting processes.

Fig is a platform for developers that adds visual apps and shortcuts to the terminal. It makes it easy to build tools that make the team more productive. Fig's API allows to run shell commands from simple javascript. Build wrappers around CLIs, custom workflows, or configurations. It was founded in 2020 and is headquartered in San Francisco, California.

We're building the future of designer collaboration. Like developers, designers need advanced tools to match their increasingly collaborative and complex workflows. But unlike developer tools, designer tools for collaboration simply haven’t kept up with the industry. Thanks to a strong engineering background and backing from world-class investors, we're able to finally give designers the sophisticated infrastructure they need to work together at scale. Our mission is to empower design teams of all shapes and sizes to create truly amazing user experiences by working together more closely.

HyperLinq brings institutional-grade software with superior technology for people who trade multiple assets on multiple exchanges or trading venues. HyperTrader is the professional-grade desktop trading terminal that enables easier price discovery, consolidated liquidity, amazing chart analysis, studies & indicators, portfolio management, smart order routing, arbitrages, algorithmic trading, unified market data APIs and consolidated portfolio management. Currently, we support 16 crypto exchanges. The availability of the US stocks market is in works. We will also add Forex markets in the future.

Vue Storefront is a Progressive Web App Storefront possible to integrate with any eCommerce platform. You can develop a native-like web app that is downloadable on iOS and Android. It makes your eCommerce extremely fast and helps you to support a mobile-first experience.

FlutterFlow is an innovative platform designed to simplify mobile application development by leveraging the Flutter framework. It serves as a visual editor that allows teams to create cross-platform applications for both iOS and Android without extensive coding knowledge. By offering a no-code tool, FlutterFlow enables users to build applications significantly faster, enhancing productivity and efficiency in the development process. The platform supports seamless integration with Firebase and provides the option to download the generated Flutter code, thereby catering to the needs of both novice and experienced developers. Overall, FlutterFlow aims to revolutionize the app development landscape by making it more accessible and streamlined.

WeWeb is a website builder for professional teams. It enables to build high performance websites quickly thanks to no-code interfaces + integrates developer friendly features so teams can connect their own back-end (Headless CMS, Shopify, Airtable, GoogleSheet, Custom API, etc.) or add custom front-end components in the drag & drop editor.

Emerge is building tools to monitor and reduce app size. Their actionable insights provide instant savings, while their continuous monitoring helps developers write smaller, better code by profiling binary size on every pull request. Bloated apps have a lower install rate and higher uninstall rate, leading to decreased customer engagement and ultimately revenue loss.

Kitemaker UX was built together with game designed. As a result, it responds to every interaction instantaneously across all users, it works offline and comes with a native desktop app. You can operate everything without your hands leaving the keyboard and through our built-in command line.

Pyroscope is an open source continuous profiling platform. With just a few lines of code it will help you debug performance issues and find bottlenecks in your code.

Doppler Technologies, Inc. is a company that specializes in secret management software. Founded in 2018 and headquartered in Walnut, California, Doppler provides a platform that enables developers to securely store and manage sensitive information such as API keys, credentials, environment variables, and database URLs. The software enhances productivity by seamlessly integrating across various programming languages, technology stacks, and infrastructures, while also fortifying security measures for organizations. Additionally, Doppler's platform features a command-line interface that intelligently retrieves relevant secrets based on project directories, allowing for efficient management and synchronization of application configurations. This proactive approach helps developers and security teams address potential security concerns before they escalate.

Waydev analyzes your codebase from Github, Gitlab, Azure DevOps & Bitbucket to help you bring out the best in your engineers work.

Raycast is a developer of a command bar software intended to assist developers to control their tools. The company's software offers a search bar to quickly search commands and the built-in store to discover and install extensions such as Jira or GitHub, enabling clients to make easy access to various applications.

Index wants companies to use its no-code dashboard builder to help visualize their KPIs and track performance. The tool boasts integration with a variety of data providers so that users aren’t forced to manually enter data into another tool. The startup hopes that building embeddable dashboards will help their solution catch fire and that startups will turn to their tool when they want to track progress on goals.

MemberStack lets you build members-only websites, dashboards, web apps, and intranets with your favorite web design tools.

Avo creates one source of truth for analytics events and generates personalized tracking libraries that give developers dev time validation that implementation is correct. Avo is a toolbox (UI and dev tool) to define event based analytics, and generate personalized tracking libraries that provide dev time validation of correct implementation. It's like a spell-checker for people to define quality data, and a type-checker for developers to make sure they send analytics according to design.

Avo creates one source of truth for analytics events and generates personalized tracking libraries that give developers dev time validation that implementation is correct. Avo is a toolbox (UI and dev tool) to define event based analytics, and generate personalized tracking libraries that provide dev time validation of correct implementation. It's like a spell-checker for people to define quality data, and a type-checker for developers to make sure they send analytics according to design.

Reflect Software Inc. is a developer of an automated web testing platform that enables users to test their websites and web services without writing any code. Founded in 2019 and based in Villanova, Pennsylvania, Reflect offers a cloud-based solution that emphasizes maintainability and minimizes manual workflows. The platform allows users to set up automated end-to-end tests, receive alerts for any errors, and record actions into repeatable tests. It supports various editing modes, including modifying input values and managing visual changes that may impact previous assertions. Additionally, users can delete test steps and create new tests based on existing ones, streamlining the testing process for developers.

Basedash Inc. is a company that specializes in providing internal tools designed to enhance database management for businesses. Founded in 2019 and based in Dover, Delaware, the company offers a suite of solutions that includes an admin panel, SQL graphical user interface, user dashboard, customer support features, and a KPI dashboard. Recognizing that many businesses either struggle with building custom tools or resort to using inadequate applications, Basedash aims to deliver a polished and flexible internal tool that meets the core needs of various organizations. This focus on usability and efficiency positions Basedash as a valuable resource for modern companies seeking to streamline their internal operations.

Screen and code sharing platform for developers.

Fig is a platform for developers that adds visual apps and shortcuts to the terminal. It makes it easy to build tools that make the team more productive. Fig's API allows to run shell commands from simple javascript. Build wrappers around CLIs, custom workflows, or configurations. It was founded in 2020 and is headquartered in San Francisco, California.

Brevy enables teams to report bugs and provide feedback directly on their website without losing any detail.

Today, every company is a software company - but software developers make up less than 1% of the population. We're building a new visual programming language for anyone to become part of the future of software development. Paragon is a low-code platform that makes it easy to build product integrations and deliver the features your customers want, faster. Paragon's visual workflow editor provides building blocks like triggers, cloud functions, and API integration - so you can just focus on your core business logic. Once deployed, Paragon workflows provide end-to-end data visibility for easy debugging, and automatically scale to provide enterprise-grade performance with zero maintenance. Backed by world-class investors like Y Combinator and Village Global, our long term vision is to democratize software development by enabling engineers and non-engineers to build products together seamlessly.

Today, every company is a software company - but software developers make up less than 1% of the population. We're building a new visual programming language for anyone to become part of the future of software development. Paragon is a low-code platform that makes it easy to build product integrations and deliver the features your customers want, faster. Paragon's visual workflow editor provides building blocks like triggers, cloud functions, and API integration - so you can just focus on your core business logic. Once deployed, Paragon workflows provide end-to-end data visibility for easy debugging, and automatically scale to provide enterprise-grade performance with zero maintenance. Backed by world-class investors like Y Combinator and Village Global, our long term vision is to democratize software development by enabling engineers and non-engineers to build products together seamlessly.

Chaos Genius is an Open-source Business Observability tool that helps you monitor your business & system metrics and get automated RCA with multi-dimension drill-downs.

Embrace is the only performance monitoring and debugging platform built for mobile apps. Whether an unsolved crash, a bug in the checkout flow, an error log without resolution, or a startup that takes too long, developers need to find every issue and not take days. With Embrace, mobile teams instantly look up any user, see every user’s sessions on command, and understand what happened seconds and minutes before any error of any type.

We're building the future of designer collaboration. Like developers, designers need advanced tools to match their increasingly collaborative and complex workflows. But unlike developer tools, designer tools for collaboration simply haven’t kept up with the industry. Thanks to a strong engineering background and backing from world-class investors, we're able to finally give designers the sophisticated infrastructure they need to work together at scale. Our mission is to empower design teams of all shapes and sizes to create truly amazing user experiences by working together more closely.

NextUX is a visual editor and collaborative whiteboard that helps provide feedback, create designs, and share ideas quickly.

Embrace is the only performance monitoring and debugging platform built for mobile apps. Whether an unsolved crash, a bug in the checkout flow, an error log without resolution, or a startup that takes too long, developers need to find every issue and not take days. With Embrace, mobile teams instantly look up any user, see every user’s sessions on command, and understand what happened seconds and minutes before any error of any type.

Asayer is an online DevOps platform based in Paris, France, founded in 2017. The platform enables users to debug and automate high-value tests for web applications, providing insights into user interactions and the performance of the entire technology stack. By offering detailed visibility into application behavior, Asayer helps users identify the root causes of issues, facilitating efficient resolution and improving overall application reliability.

“Better code search,” currently for Swift, TypeScript and Javascript. Whereas many code environments only do plaintext search, Metacode sorts results by relevance, displays code in the context of code around it and allows you to filter results by keyword. The company says more than 700 engineers from companies like Pinterest and VueJS are currently using it. The cost is $25 per month per engineer.

Lantern is a software development company specializing in data analytics across various business sectors. The company focuses on user behavior monitoring for contemporary product teams, offering a solution that automatically identifies behavioral changes that may affect revenue. Lantern's platform operates autonomously, requiring no coding, configuration, or specialized data expertise, making it accessible for teams looking to enhance their understanding of user engagement and its impact on business performance.

Refinery Labs Inc. is a Seattle-based company founded in 2014, specializing in a web-based software platform tailored for software developers. The platform features a drag-and-drop interface that allows users to deploy new functionalities through linkable code blocks, significantly enhancing development speed. It leverages serverless technology to facilitate the integration of various AWS services, including AWS Lambda and API Gateway, which streamlines the software creation, testing, and deployment processes. Additionally, Refinery Labs provides tools for mood boards and concept delivery aimed at the TV, film, video production, and animation sectors, catering to a diverse range of creative and technical needs.

Midtype's SaaS Development Kit (SaaSDK) supplies the building blocks for developing SaaS products. Manage users, enable payments, and integrate with your favorite services, so you can stay focused on shipping features your customers will love.

CodeStream puts team chat directly into today’s most popular IDEs, making it easier for developers to talk about code and write software together. Build for coders by coders, its service helps software teams accelerate their development cycles and reduce technical debt through faster, easier communication.

Deepnote is a collaboration platform designed specifically for data scientists, founded in 2019 and headquartered in Prague, Czech Republic. The platform provides development software that facilitates real-time collaboration among users. Key features include versioning, code review, and the reusability of algorithms, which enhance the efficiency of data analysis projects. Additionally, Deepnote offers tools such as variables and plots, code intelligence, shortcuts, and a command palette, along with capabilities for creating dashboards or APIs. This combination of functionalities aims to streamline the workflow of data scientists and improve the overall quality of their work.

A cross-platform app development tool used for rendering HTML UI within games and desktop applications. The company’s goal is to replace Chromium by providing a GPU-accelerated proprietary renderer. Ultralight says it will be compatible with most programming languages.

Visly is a the design tool for front-end engineers.Visly enables you to manage and sync design assets across multiple platforms, directly with your codebase. No copy-pasting. No exporting. No manual work.Visly is creating a shared space for developers and designers to collaborate on products.

Dockup develops a platform for engineering industry to create an on demand-staging environment with unique URLs and delivers them to Slack. The platform provides automated deployments, automated quality assurance checklists, and slack integration. Dockup is headquartered in the United States.

Avo creates one source of truth for analytics events and generates personalized tracking libraries that give developers dev time validation that implementation is correct. Avo is a toolbox (UI and dev tool) to define event based analytics, and generate personalized tracking libraries that provide dev time validation of correct implementation. It's like a spell-checker for people to define quality data, and a type-checker for developers to make sure they send analytics according to design.

Toybox captures any web page - not just a screenshot of one. With one-click, they pull in every HTML and CSS element (whether it's live in production or on a local branch) and re-render your page in Toybox. Gain visibility into what's being developed before it reaches your users.

Key Values Helps software developers find teams that share their values.

User Hero is a software platform that allows UX researchers and Product Managers organize all of their qualitative information. As a repository, we allow you to run reports and analytics on your qualitative data to extract insights, highlight trends, and track features related to user feedback.

Repl.it lets you start coding in your favorite programming language in 2 seconds; it lets you build and deploy apps right from your browser. The founders wanted to build something to solve their own problem -- back in school they were tired of setting up their development environment on every machine they wanted to code on, and they dreamed of a world where you could just open a tab in the browser and start working. They built Repl.it to give developers access to simple, powerful tools and a community of hackers, aspiring programmers and teachers. They make it possible to learn, practice and build, all in the same place.

CodeStream puts team chat directly into today’s most popular IDEs, making it easier for developers to talk about code and write software together. Build for coders by coders, its service helps software teams accelerate their development cycles and reduce technical debt through faster, easier communication.

Retool is a developer of a platform that enables businesses to create custom tools without the need for programming knowledge. The platform allows users to build interfaces that facilitate the display and manipulation of data efficiently and accurately. By providing customizable workflows, Retool empowers operational development teams to enhance their productivity, enabling businesses to concentrate on their core products and expertise. This approach simplifies the tool-building process, making it accessible to a broader range of users and helping organizations streamline their operations.

Dost builds software, audio content, and toolkits that make it easy, fun and addictive for parents of any literacy level to boost their child’s early development.

Opsolutely allows development teams to understand their infrastructure at a glance and control it with ease.

Expo lets developers build universal native apps that work across Android, iOS, and the web by writing them once in just JavaScript.

Real Artists make Fast, native, comprehensive issue tracking and code review.

Instabug is a computer software company that specializes in providing tools for mobile app developers to enhance application quality and performance. Founded in 2012 and headquartered in Giza, Egypt, with operations in California, the company offers a platform that includes crash reporting, application performance monitoring, user surveys, and real-time contextual insights. These features enable developers to identify bugs and errors throughout the application's life cycle, facilitating a more efficient testing process. By leveraging crowdsourced feedback, Instabug helps developers pinpoint the exact conditions that lead to functionality issues, ultimately improving the overall user experience.

SourceDNA, Inc. is a technology company based in Oakland, California, founded in 2011. It specializes in application store intelligence, providing tools that automatically scan iOS and Android applications to identify code usage and track the market share of software development kits (SDKs). The company offers a platform called Searchlight, which allows users to analyze and monitor applications for security vulnerabilities and quality issues. SourceDNA's services enable developers and service providers to understand who is utilizing their code by continuously scanning app stores and binaries for matches. The analytics software developed by SourceDNA acts as a code watchdog, assessing the security of various platforms, including mobile devices, game consoles, and micro-controller firmware, thereby assisting users in making informed decisions about their software development and security practices.

Treeline is a United States-based company that specializes in designing and developing software for creating backend applications. Its platform simplifies the process of building custom, high-performance applications for Node.js, allowing users to develop enterprise-grade backends rapidly and efficiently. With Treeline's tools, users can accelerate application development, completing projects in hours rather than months.

CodeNow is a nonprofit focused on teaching under-represented youth to code. They provide free, out-of-school training hosted at local tech companies.

Appcubator has launched to allow users to create their own web applications with drag and drop, text inserts and custom themes, rather than having to endure the arduous process of learning to create a full-functioning website or hire a contractor.

Instant sandboxed server environments

Floobits lets you use native text editors to collaborate on code in real-time. Floobits has 7,000 users signed up with eight hours a day on average per usage. The two co-founders Matt Kaniaris and Geoff Greer used to pair program together while at Rackspace, and after leaving, they realized that they wanted to build something that could help others do the same. The service offers freemium pricing, where free accounts have up to five workspaces available. But to work privately, a paid account starting at $15 per month is required.

Backlift allows front end developers to build rich websites. Backlift allows you to deploy a new website to your Dropbox and the Web. When you change your Dropbox files, your website will automatically refresh

Light Table is a new interactive IDE that lets you modify running programs and embed anything from websites to games. It provides the real time feedback we need to not only answer questions about our code, but to understand how our programs really work.

Coderwall is a collaborative learning platform for software developers to improve their programming knowledge. It is based in San Francisco, California.

Clutch offers innovative tools designed to enhance the efficiency of website and mobile application development. By streamlining the process of creating user interfaces, Clutch enables designers and developers to collaborate seamlessly without the need for time-consuming code conversion. The platform features a visual design canvas called "Clutch Creator," which facilitates real-time teamwork, akin to a Google Docs experience, allowing multiple users to work on the same project simultaneously. Additionally, Clutch provides a component engine and marketplace that empower professionals to create and share reusable components that integrate easily with existing backends and APIs. This integrated approach addresses common challenges in mobile app development, such as A/B testing and rapid iteration, ultimately offering a more effective solution for building front-ends than traditional tools available in the market.

ZigFu provides tools to help developers create apps that are controlled by human gestures. The company is based in San Francisco, California.

Zenbox is a browser extension that connects all of your SaaS services.Open an email, and Zenbox pulls in your customer information from dozens of services right into the sidebar.

Proxino is a cloud platform for monitoring and debugging client-side JavaScript.

BakedCode, Inc. is a software development company based in San Francisco, California, founded in 2010. The company specializes in creating applications designed to assist developers and businesses in enhancing existing solutions or developing new ones. Its notable products include Interstate, which offers project management support through user-friendly roadmaps, and Prompt IM, a real-time chat application. BakedCode aims to streamline workflows and improve communication for its users.

Tumult Inc. makes the next generation of designer tools to produce beautiful web content.

NudgePad is an IDE in your browser

Trigger, a San Francisco, CA-based company that has just launched its cross-platform mobile development framework targeted at web developers who want to be able to create native mobile apps.

Trigger, a San Francisco, CA-based company that has just launched its cross-platform mobile development framework targeted at web developers who want to be able to create native mobile apps.

Wundrbar wants to improve upon the search bar experience by providing users with powerful inline commands. The idea is reminiscent of YubNub but Wundrbar strives to appeal to a larger audience and to incorporate functionality that helps people manage their personal online accounts in addition to searching the web.

AppJet was an online programming tool designed for building simple web applications, founded by former MIT students and backed by Y Combinator. The platform aimed to streamline the web application development process using a web-based text editor that employed JavaScript for both server and client-side programming. It provided users with various code libraries, including those for database management and Facebook API integration. To efficiently host user applications, AppJet developed a unique application virtualization system that managed processor allocation and prevented excessive resource consumption. While the platform was innovative in its approach to web app development, it appears to be inactive today, with only some legacy downloads available.

Better Desktop search solution.