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One note holds the explanation and the snippet. Stop splitting answers across docs, gists, and scratch files.
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Your developer notebook for notes & snippets
The developer notebook that keeps your explanation and your code in one place — private, searchable, and ready when you ship again.
- Free to start — no credit card
- 35+ snippet languages
- AI explain · Cmd+K · VS Code
Not another generic notes app — built for how developers capture and reuse what they learn.
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Code Notebook — read view
Snippet
const tags = useMemo(
() => [...new Set(
notes.flatMap((note) => note.tags ?? []),
)],
[notes]
);AI Explanation
This pulls every unique tag out of your notes array by flattening each note's tags and deduping with a Set.
It wraps the work in useMemo so the list only rebuilds when notes changes — avoids redoing the work on every render.
Worth knowing
note.tagscan be undefined — the?? []fallback keepsflatMapfrom crashing- An empty
notesarray gives you an empty tag list, not an error Setremoves duplicates but doesn't preserve any particular sort order
Snippet languages in the composer
TypeScriptReact · TSXReact · JSXJavaScript / Node.jsPythonGoRustJavaKotlinC#C / C++PHPRubySwiftSQLGraphQLJSONYAMLXMLHTMLCSSSCSSLessMarkdownBash / ShellDockerfilePowerShellINI / TOML-style configDartElixirScalaLuaRSolidityRedisTypeScriptReact · TSXReact · JSXJavaScript / Node.jsPythonGoRustJavaKotlinC#C / C++PHPRubySwiftSQLGraphQLJSONYAMLXMLHTMLCSSSCSSLessMarkdownBash / ShellDockerfilePowerShellINI / TOML-style configDartElixirScalaLuaRSolidityRedis
35+Snippet languages
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Why Code Notebook
Built for developers who ship
Three reasons developers choose Code Notebook — feature details live in the docs.
Find it when it matters
Tags and fuzzy search built for growing libraries — not a folder tree you abandon after a week.
Learn moreCopy the way devs share
Raw code in one click, syntax screenshots when your team needs the highlight colors.
Learn moreThe flow
Compose → organize → reuse
A simple loop — no feature dump. See the full walkthrough in documentation.
Compose
Capture the solve
Title, rich body, tags, and a Monaco panel — one flow for create and edit.
Library
Organize at scale
Dashboard plus a searchable grid when your snippet count climbs.
Reuse
Copy and move on
Read view with instant copy — back to shipping, not re-finding.
How it works
Up and running in minutes
Three steps to your first snippet library. Read the full guide →
- 01
Create your account
Sign up — your notebook is private from day one.
- 02
Save your first note
Add context, tags, and a snippet in the composer.
- 03
Find and reuse
Search or filter by tag, then copy when you need the code again.
Power features
More than a notes app
AI explain, shareable links, keyboard navigation, and a VS Code extension — details in the docs.
AI explain
Stream a plain-English walkthrough of any snippet from the Monaco toolbar.
Learn morePublic share links
Opt in per note — copy a read-only URL for teammates without an account.
Learn moreCommand palette
Cmd+K or Ctrl+K to jump to notes, open the library, or create a note.
Learn moreVS Code extension
Select code, right-click Save to Code Notebook — snippet and language pre-filled.
Learn moreReady to build your snippet library?
Start free today. Questions? The documentation covers every feature in detail.