Free: 2,500 words per month, all intensities, API access (60 requests/min), document history, no credit card required. Pro: $19/month for 100,000 words per month, 300 requests/min API limit, priority support. Word pack: $9 for 50,000 words with no expiration or subscription.
Not given
Key features
Self-hosted fine-tuned language model
Three intensity levels per request
3-5 second average response time
Content never used for training
Works with any AI model
Webhook support for real-time events
Dashboard with API key management
Document history and web-based interface
PASS, REVIEW or FAIL verdicts on emails
Detects unsolicited diagnoses and privacy intrusion
Catches generic flattery and fake familiarity
Identifies asymmetric asks and excessive homework
API integration for automated checking
MCP support for AI agents
Gmail and Outlook browser extensions
ChatGPT app integration
Structured JSON verdicts via API
What makes it different
Rewrites sentence structure and rhythm, not just synonyms
Completely private with no data sharing or third-party APIs
Simple integration with any HTTP client
Generous free plan without credit card requirement
API-first design for programmatic use at scale
Uses deterministic filters with fixed rules before applying AI analysis
Judges message form rather than facts it cannot verify
Scales across workflows and no-code platforms
Integrated with Zapier, Make, n8n, Clay and other tools
ToHuman
MailDignity