LangWatch provides evaluations for language models and tests for AI agent applications.
Open source
16 alternativesrehydra
rehydra scans LLM prompts for accidental personal information before they reach a model.
About rehydra
rehydra is an open-source SDK that scans LLM prompts for personal information before they reach a model. It detects structured data such as emails, phones, IBANs and credit cards with regex, and names, organizations and locations with an on-device NER model, then replaces values with stable placeholders that persist across a session and restores originals from an encrypted map for file writes, commands or final answers.
It can be used as a local proxy for AI coding tools, a Chrome extension for ChatGPT and Gemini, an OpenCode plugin, and an embeddable library for Node.js, Bun and browsers. The proxy requires an Anthropic API key and does not support Claude Max/Pro OAuth subscriptions through proxies, and the OpenCode plugin does not scrub the separate session-title request.
Key features
- Detect structured PII with regex patterns (emails, phones, IBANs, etc.)
- Detect names, organizations, locations with on-device ONNX NER model
- Replace PII values with stable session-persistent placeholders
- Restore original values from encrypted map for tool actions
- Local proxy for OpenAI/Anthropic-compatible clients including Claude Code, Cursor
- Chrome extension to anonymize ChatGPT and Gemini prompts in browser
Best for: Developers and teams using AI coding tools or browser chatbots who need to keep names, contact details and secrets out of prompts.
Good for
- NER detection runs on-device with no cloud calls
- Stable placeholders keep entity relationships across messages in a session
- Original values are stored encrypted with AES-256-GCM for restoration
Watch out for
- Proxy requires an Anthropic API key and does not support Claude Max/Pro OAuth subscriptions
- OpenCode session-title request bypasses plugin hooks and can send first message without scrubbing
rehydra at a glance
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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rehydra FAQ
How does Rehydra handle PII differently from permanent redaction?
It replaces each value with a stable placeholder for the session and restores the original from its encrypted map when needed for tool actions or final answers.
Does the proxy work with Claude Max/Pro subscriptions?
No. The proxy requires an Anthropic API key, and Claude Max/Pro subscriptions use OAuth which api.anthropic.com does not support through proxies.
Does the OpenCode plugin scrub all requests?
No. The separate session-title request bypasses the plugin hooks and can send the first message without scrubbing unless the title agent is disabled.
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