Extra CreditLearn the engineering behind what your agents build.
Extra Credit reads your Claude Code sessions while you work, finds the concepts in the code your agents write, and quizzes you on them before you forget. Your progress is measured against each technology's own official docs.
How it works
It watches your sessions
A menu bar app that reads your Claude Code transcripts and spots the languages, frameworks and services each change touches.
It teaches what you shipped
Short lessons and quizzes on the concepts in your own code, filed under the sections of each technology's official docs.
It tracks what you know
Spaced repetition asks again before you forget. Each technology climbs from bronze to platinum on your skill map.
The skill map
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Languages
729Popular, More languages, Data and config formats, Markup and templating, and more
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Frameworks and libraries
205Popular, Application Frameworks, Tooling, Hosted Platforms, and more
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Cloud providers
972Popular, AWS services, Azure services, Google Cloud services, and more
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Databases and data
180Popular, Database, Streaming & Messaging, Data Architecture, and more
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Infrastructure and DevOps
9,670Popular, Docker images, GitHub Actions, Helm charts, and more
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AI and LLMs
2,138Popular, Hugging Face models, Framework, Agent Framework, and more
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Web platform
145Web APIs, Web guides
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Platforms and SDKs
471Apple frameworks, Android Jetpack, Android platform, Games and XR, and more
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Standards and protocols
157Web and networking protocols, Language and platform specs, Data and API specs, Auth and identity, and more
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Security
61OWASP, Supply chain and secure development, Cloud and platform security, MITRE and vulnerability data
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Industry standards and compliance
83Healthcare data and interoperability, Compliance and privacy, Healthcare codes and terminologies, Payments and finance, and more
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Systems and hardware
102Operating systems and internals, Embedded and IoT, Compilers and toolchains, GPU and parallel computing, and more
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Developer tools
4,041Popular, Homebrew formulae, Editor extensions
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APIs and services
2,301Popular, Public APIs: Development, Public APIs: Government, Public APIs: Geocoding, and more
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Packages and libraries
63,807Python packages, npm packages, Go modules, Maven packages, and more
Popular technologies
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AssemblyScript 9 docs sections -
Bash 20 docs sections -
C 11 docs sections -
C# 20 docs sections -
Actix 14 docs sections -
aiohttp 13 docs sections - Alembic 13 docs sections
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Alpine.js 12 docs sections -
Akamai CDN 14 docs sections - Akamai Cloud 14 docs sections
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Appwrite 14 docs sections - AWS 18 docs sections
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Airbyte 12 docs sections -
Airflow 17 docs sections - Amazon Redshift 14 docs sections
- Apache Iceberg 13 docs sections
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Ansible 13 docs sections -
Apache HTTP Server 15 docs sections -
Argo CD 14 docs sections -
Bazel 15 docs sections -
Claude API 17 docs sections -
Claude Code 19 docs sections - Cohere 12 docs sections
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CrewAI 13 docs sections -
Android 14 docs sections - AsyncAPI 13 docs sections
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Bitbucket 11 docs sections -
Chrome DevTools 16 docs sections -
Adyen 14 docs sections -
Airtable 9 docs sections -
Algolia 11 docs sections - Amplitude 12 docs sections