Last updated: June 10, 2026 · Provider: Tack and K
PromptLab collects and transmits no user data.
Everything you create is stored only in your own device's local browser storage.
Only what you create and save: prompt bodies, titles and tags, version history and notes, result notes, prompt chains, and extension settings.
All data is stored exclusively in chrome.storage.local (your device's local storage). Nothing is stored on any external server or cloud.
The extension transmits no data externally. Its source code contains no network code (fetch / XMLHttpRequest / sendBeacon, etc.) and makes no external API or LLM calls.
Your data is never shared, sold, or provided to any third party.
No analytics, behavioral tracking, or ad-identifier collection. No third-party analytics tools are used.
| Permission | Use |
|---|---|
storage | Save your data locally on the device |
sidePanel | Show the main UI (side panel) |
contextMenus | Right-click "Save to PromptLab" on claude.ai |
host: https://claude.ai/* | Save/insert in the claude.ai input field |
It does not request <all_urls> ("read data on all sites"). It runs only on claude.ai.
Delete any data anytime in the extension, export it as JSON for backup, and uninstalling removes all local data.
The extension is not directed at children and collects no information from anyone.
Changes are reflected by updating the "Last updated" date on this page.
For questions, contact the provider (Tack and K).
PromptLab は、利用者のいかなるデータも収集・送信を行いません。 作成したデータはすべて端末内（chrome.storage.local）にのみ保存されます。ソースコードにネットワーク通信は一切なく、外部API・LLM 呼び出しも行いません。第三者提供なし、解析・トラッキングなし。<all_urls> は要求せず、動作は claude.ai のみ。データは拡張機能内でいつでも削除でき、エクスポートでバックアップ可、アンインストールで端末内データは全削除されます。