whoosin

Stop guessing who's available before you set the lineup

whoosin is a $5/mo tennis RSVP tool that finds the availability email already in your Sent folder — zero setup — and reads every reply into a live tally, so you know the second you have the players you need to fill your lineup.

The headache: You've sent the availability email, replies are trickling in across days, and you're mentally tallying yes/no/maybe in your head before you can even think about setting the card.

1. Join the beta, then connect your Gmail — whoosin finds the invite you already sent. Nothing to set up.
2. Your group just replies from whatever email they already use — no app, no account, no link. whoosin reads each reply as yes / no / maybe (or approve / reject, or a guest count) with AI.
3. You get a live list — a running headcount when you ask for one — with manual overrides and one-tap follow-up drafts.

Private by design. Your mail is read in your browser, replies are sorted by AI for a moment and then discarded, and only the answer — yes, no, maybe — is kept. No ad trackers. Follow-ups are drafts in your Gmail; whoosin never sends mail as you.