No moat. Still in business.

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An iPhone app that takes Japanese learners from beginner to fluent with one new sentence per flashcard and spaced review.

Since 2015

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.

Since 2026

Free plan · Security and passwords · Freelancers

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

Since 2026

Hiring and recruiting · Software companies

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Video player for language learners that shows two subtitle tracks at once, generates subtitles and translates them live.

Free · Video and audio · Individuals and families

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Describe a task in a sentence and get an automation workflow you can preview, cost out and approve before it runs.

Since 2025

Subscription · Automation and integrations

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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.

Since 2026

Free plan · Projects and tasks · Developers

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Turns prompts into editable Python for mesh modelling, simulation setup and 3D printing, with shareable 3D results.

Since 2025

Free plan · Design and images · Manufacturing

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Traces AI agent runs in production, flags silent failures and lets teams test changes in simulation before release.

Since 2025

Free plan · Uptime and monitoring · Developers

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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 Claude Code and Codex jobs in parallel inside isolated containers, locally or on cloud runners, with memory shared across them.

Since 2018

Free plan · Developer tools · Developers

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Deploys each labelled GitHub pull request as a live preview environment on your own Lightsail or Hetzner servers.

Since 2020

Developer tools · Developers

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Flash card app for learners to keep their own word lists and practise them with spaced repetition on Apple devices.

Courses and learning · Individuals and families

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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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Mobile app where learners practise speaking a new language with AI characters and get pronunciation scores.

Since 2024

Courses and learning · Individuals and families

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Run MATLAB-style code with automatic GPU speedups and live 3D plots, in the browser, on desktop or from the command line.

Free plan · Developer tools · Developers

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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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Keeps pull request discussions in sync across GitHub, Slack and VS Code so dev teams and AI agents review code faster.

Free plan · Developer tools · Developers

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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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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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A Mac app for comparing text, images and folders and resolving Git merge conflicts, for developers and designers.

Subscription · Developer tools · Developers

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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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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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Teaches English, Spanish, French and other languages through song lyrics, with spaced repetition for new words.

Since 2024

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 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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Flashcard maker that schedules reviews by spaced repetition, with dictionaries and text to speech for language learners.

Since 2024

Free plan · 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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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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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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Self-hosted platform for managing Git, Subversion and Mercurial repos with shared code review and permissions.

Free · 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.

Since 2026

Free plan · Courses and learning · Individuals and families

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A code review tool that explains changes made by coding agents as a story, with threaded questions for developer teams.

Since 2026

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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A language app that translates words offline, saves them to your own tagged word list and helps you review them with flashcards.

Since 2025

Courses and learning · Individuals and families

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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.

Since 2026

Free · Developer tools · Developers

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Records what each CI run did, such as processes and network calls, and posts a summary to the pull request.

Since 2025

Security and passwords · Developers

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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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Practise a new language by chatting with AI, tapping words to save them and reviewing them later with spaced repetition.

Since 2025

Free plan · Courses and learning · Individuals and families

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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

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Independent hosted git service with merge requests, CI runners, a container registry and AI code review for dev teams.

Since 2026

Free plan · 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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Run code review interviews for engineering candidates using ready templates and shared scoring rubrics.

Since 2026

Hiring and recruiting · Software companies

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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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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 browser extension for Chinese learners that puts words from your level into English pages, with readings and meanings on hover.

Since 2026

Courses and learning · Individuals and families

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

Since 2026

Free plan · Developer tools · Developers