Sendsei

Sendsei adds a Check before send button to Gmail's compose window to preview the draft before sending.

Sent is forever. Sendsei reads every outgoing email before you send it and tells you how it will actually land. One click on "Check before send" and Sendsei gives you: — A tone read: how the email comes across, not just whether it's grammatically correct — Risk flags: the passive-aggressive phrase, the buried ask, the line that reads as hostile — with the exact words that cause it — A suggested rewrite that keeps your point but loses the problem It's not a grammar checker. It reads for how a real person on the other end will feel reading it. WHITE BELT — free Tone read and risk flags on every email. 4 checks a day. No credit card. BLACK BELT — $10/month Everything in White Belt, plus the full context form (tell Sendsei your intent, the relationship, your tone goal, the stakes) and an intent read that judges whether your draft actually achieves what you set out to do. 50 checks a day. Works with Gmail. Outlook for web coming soon. HOW IT WORKS When you click "Check before send," your draft is sent securely to Sendsei's servers and to the Anthropic API to generate the review. Your drafts are never stored and never used to train any model. Privacy policy: https://sendsei.org/privacy Questions: hello@sendsei.org