No moat. Still in business.

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A browser extension that saves and highlights words you look up on web pages, then drills them with flashcards.

Since 2020

Free plan · Courses and learning · Individuals and families

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Runs coding agents in managed cloud machines for code review, bug fixes and background tasks, set up in YAML.

Since 2024

Developer tools · Developers

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Records program execution so developers can replay and step back through bugs in the IDE, CI and code review.

Since 2025

Free plan · Developer tools · Developers

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Graded Japanese stories at your JLPT level, with tap-to-define words, grammar notes, audio and flashcards.

Subscription · Courses and learning · Individuals and families

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Helps intermediate language learners reach fluency through spoken chats with an AI tutor, corrections and daily articles.

Courses and learning · Individuals and families

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A keyboard-driven Mac and Linux app for reviewing GitHub pull requests, with diffs, checks and threads loaded from a local cache.

Developer tools · Developers

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An app for learning Japanese with an AI tutor, speaking roleplays, kanji, quizzes and a personal study plan.

Free plan · Courses and learning · Individuals and families

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Mac editor where you write what to build, agents comment and explore options, then build the chosen one as a pull request.

Since 2024

Developer tools · Developers

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Listening drills that help language learners catch spoken numbers, phone numbers and clock times in over two dozen languages.

Courses and learning · Individuals and families

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Short Spanish stories pitched at the words an A2 to B1 learner already knows, with unknown words brought back for review.

Free plan · Courses and learning · Individuals and families

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Fixes the mixed content and insecure content warnings a WordPress site shows after it moves to HTTPS.

Website builders

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A light code hosting forge with repos, issues and pull requests that teams run on their own server.

Free · Developer tools · Developers

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Code review tool that splits pull requests into ordered chapters so reviewers follow changes faster.

Since 2026

Subscription · Developer tools · Developers

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Builds your app on every pull request, tests the affected user journeys and posts videos of any bugs it finds.

Since 2025

Developer tools · Developers

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Reviews pull requests against your own policies and docs, citing each finding and offering checked one-click fixes.

Free plan · Developer tools · Developers

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A Mac app that runs several AI coding agents side by side in separate clones and chains them to plan, build, review and test.

Free · Developer tools · Developers

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Stores the reasoning from AI coding chats with each git commit and posts it to pull requests for team review.

Free plan · Developer tools · Developers

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Mac app that runs Claude Code, Codex and other coding agents side by side in separate git worktrees, with a second agent reviewing diffs.

Since 2026

Free · Developer tools · Developers

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Live voice lessons with an AI language tutor that corrects mistakes as you speak and remembers your past sessions.

Free trial · Courses and learning · Individuals and families

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A shared workspace where teams run Claude Code, Codex and other coding agents on tasks, scheduled bots and reviewed pull requests.

Free plan · Developer tools · Developers

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A Mac app for comparing Git commits and branches, tracing file history and resolving merge conflicts.

Since 2023

One-off payment · Developer tools · Developers

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A web workspace where analysts write SQL over market prices, macro series and SEC filings, then chart the results without Python.

Subscription · Data and spreadsheets

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A language learning app for 77 languages where every lesson ends with you saying the sentence aloud and getting feedback.

Free plan · Courses and learning · Individuals and families

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Browser extension that swaps sentences on the pages you read into the language you are learning, scaled to your level.

Since 2024

Subscription · Courses and learning · Individuals and families

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Scans code for quality issues, security flaws and AI coding policy breaks across a team's repositories, with automated review.

Since 2012

Free trial · Developer tools · Developers

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Paste code to get a score and a list of security and quality problems, with the option to hire a human reviewer.

Free plan · Security and passwords · Freelancers

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Excel add-in for querying tables with SQL, scripting workbooks in C# and building custom Excel functions.

Since 2016

Free plan · Data and spreadsheets · Developers

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A coding agent app that works out a spec with you first, then writes, checks and hands back code for approval.

Developer tools · Developers

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An app for practising spoken conversations in 10 languages with an AI partner, then chatting with native speakers with translation.

Free plan · Courses and learning · Individuals and families

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Shared IDE and cloud where engineering teams run coding agents and review their plans and diffs together.

Since 2026

Subscription · Developer tools · Developers

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A Windows app that runs several AI coding agents as planner, coders, tester and reviewer on a shared board you control.

Free · Developer tools · Developers

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Translates words and short phrases with examples and pronunciation, then saves them to a personal list for language learners.

Since 2026

Courses and learning · Individuals and families

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A Mac menubar app that lists your GitHub and GitLab pull requests and gives you a workspace to review them.

Free plan · Developer tools · Developers

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A set of AI agents that turn customer requests into tickets, code changes and reviewed pull requests for software teams.

Subscription · Developer tools · Developers

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Git hosting and code review with stacked pull requests, usable alone or kept in sync with GitHub.

Since 2026

Developer tools · Developers

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Local Kanban board for handing tasks to coding agents like Claude Code and Codex, then reviewing plans and diffs before merging.

Free plan · Projects and tasks · Developers

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A 30 minute hiring test where engineering candidates review a realistic pull request and an AI agent answers their comments.

Hiring and recruiting · Software companies

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A coding environment for developers to run several AI agents at once and review the code changes they make.

Since 2023

Subscription · Developer tools · Developers

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Spreadsheet that links to databases and files and lets AI write the formulas, Python and charts for you.

Since 2023

Data and spreadsheets

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Desktop app that runs several AI coding agents in separate git worktrees and tells you when each needs input.

Since 2026

Free plan · Developer tools · Developers

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Writes pull request descriptions and team change summaries from your code diffs in GitHub and GitLab.

Free plan · Developer tools · Developers

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Mac app that pauses your shows and podcasts after each sentence to explain the translation, words and grammar.

Since 2026

Free plan · Courses and learning · Individuals and families

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GitHub style web interface over AWS CodeCommit so whole teams can read code and review pull requests without needing AWS logins.

Since 2026

Subscription · Developer tools · Developers

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A Chrome extension that translates X and Reddit posts and quizzes you on new words, for people learning English.

Subscription · Courses and learning · Individuals and families

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Language learners listen to free public domain audiobooks while following highlighted text and optional translations.

Free · Courses and learning · Individuals and families

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Ad-free app that teaches children aged 3 to 14 one of 19 languages through listening, speaking and reading along.

Since 2024

Free plan · Courses and learning · Individuals and families

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Gets and renews free Let's Encrypt SSL certificates on cPanel shared hosting without command line work.

Free plan · Security and passwords

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A federated code host with stacked pull request review and CI. You can use the hosted service or run it yourself.

Since 2025

Developer tools · Developers