GAP — Text & Code Diff Tool
GAP is a free, privacy-first text and code diff tool that runs entirely
in your browser. Paste two texts or code snippets and see the differences
instantly. Everything is computed client-side: no upload, no account, and
no telemetry beyond anonymous page-view counts. Bilingual interface
(한국어 · English).
Features
- Runs 100% client-side — your text and code never leave the browser
- Syntax highlighting for 18 languages: TypeScript, JavaScript, TSX, JSX, Python, Go, Rust, Java, C, C++, SQL, Shell/Bash, HTML, CSS, JSON, YAML, Markdown, plain text
- Split and unified diff views
- Dark and light themes that follow the OS preference
- Drag-and-drop file loading with language inference from the extension
- Keyboard shortcuts: ⌘/Ctrl+Enter to diff, ⌘/Ctrl+Shift+S to swap
- Free, no account, no sign-up
FAQ
Is my text or code uploaded to a server?
No. GAP runs entirely in your browser. The diff is computed client-side and
nothing you paste or load is ever sent to a server — there is no upload, no
account, and no telemetry beyond anonymous page-view counts.
Is GAP free?
Yes. GAP is completely free, with no account, sign-up, or paywall, because
all processing happens locally in your browser.
How is GAP different from server-based online diff tools?
Most online diff tools send your text to a server to compute the comparison.
GAP does the entire diff in the browser, so your data never leaves your
machine — making it safer for confidential code or sensitive documents.
Release notes & changelog