Overview
The Measurably Chrome extension tracks and scores your AI prompt effectiveness across supported tools. Your raw prompt text is scored entirely on your device and is never transmitted to any server. Only aggregated scores and metadata are stored.
What the Extension Collects
When you submit a prompt on a supported AI tool, the extension computes the following locally on your device:
- AI Effectiveness Score (AES): A 0–100 composite score computed from six dimensions.
- Dimension scores: Specificity, Context Engineering, Task Decomposition, Iteration Quality, Token Efficiency, and Output Specification.
- Session metadata: Tool name (e.g. ChatGPT, Claude), estimated token count, prompt length, and timestamp.
What the Extension Does NOT Collect
- Raw prompt text or AI conversation content
- AI-generated responses or output
- Browsing history, cookies, or activity on other websites
- Personal files, documents, or screenshots
- Keystrokes outside of prompt submission events
How Data Is Stored
- Locally (always): Scores, sessions, and daily metrics are cached in
chrome.storage.local on your device. - Cloud sync (optional): If you sign in, scores and metadata (not raw prompts) are synced to our Supabase backend over HTTPS so you can view your dashboard at measurably.dev. This sync is entirely optional.
Supported Tools
The extension only activates on these AI tool websites:
- ChatGPT (chatgpt.com, chat.openai.com)
- Claude (claude.ai)
- Google Gemini (gemini.google.com)
- Grok (grok.x.ai, x.com/i/grok)
- DeepSeek (chat.deepseek.com)
- Perplexity (perplexity.ai)
- GitHub Copilot (github.com/copilot)
- Microsoft Copilot (copilot.microsoft.com)
- OpenAI Codex (codex.openai.com)
The extension has no access to any other websites.
Permissions Used
storage — Cache scores and session data locally on your device.alarms — Schedule periodic background sync (every 5 minutes when signed in).- Host permissions: Limited to the 9 supported AI tool domains listed above.
AI-Powered Prompt Improvement (Pro Users)
Pro, Team, and Enterprise subscribers have access to AI-powered prompt rewriting and scoring. When you use the “AI Improve” or “AI Score” features, your prompt text is sent to xAI (Grok) for processing.
- Opt-in only: Prompts are only sent when you explicitly click the AI Improve or AI Score button. No prompts are sent automatically.
- Not stored: Prompts sent for AI processing are not stored on our servers or by xAI beyond the immediate request.
- Free tier unaffected: Free users' scoring and improvement remains fully local and heuristic-based. No prompt data leaves your device on the Free tier.
- First-use disclosure: The first time you use AI Improve, a notice is displayed informing you that your prompt will be sent for processing.
Third-Party Data Sharing
We do not sell, rent, or share your data with third parties. Synced data is stored in Supabase (PostgreSQL with row-level security) and is only used to power your personal Measurably dashboard. AI-powered features use xAI (Grok) as described above; no other third parties receive your data.
Your Rights
- Use without an account: The extension works fully offline. Scores are computed and displayed locally without signing in.
- Log out at any time: Logging out stops all cloud sync. Local data remains on your device.
- Request data deletion: Email support@ashlr.ai to delete all server-side data. Local data can be cleared by removing the extension.