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Fair use and limits.
Kata AI has generous limits, set so that almost nobody meets them. Here is what they are on every plan, and what happens if you ever do.
What counts
Fair use applies only to messages to Kata, the AI part. Logging, charts, streaks, every data view and everything non-AI is unlimited on every plan, always. One message often logs several things at once, so a real day rarely spends more than a handful.
The allowances
| Plan | Messages to Kata | In practice |
|---|---|---|
| Kata Free | 300 per month | Kata at starter volume: around 10 real exchanges a day. |
| Kata Plus | 500 per month | Kata at daily volume: around 16 real exchanges a day, more than almost anyone uses. |
| Kata Unlimited | Unlimited, on fair use | Use Kata as much as your days need; fair use applies. |
From 16 November every account gets 30 days of Kata Plus, so that month runs at the Plus allowance. The plans themselves are on Plans and fair use.
What happens at the edge
Kata does not slam a door. If you pass the included usage on Free or Plus, it keeps working and, only when it fits naturally, adds one line at the end of a reply: you can finish today and, if you want to keep this pace, tomorrow is a good moment to upgrade. It never nags twice in a row, and it says nothing at all in a sensitive moment. On Free, replies past 300 messages in a month keep coming in full on the fast model.
At 1,500 messages in a month sits the fair-use line: past it, replies keep coming on the fast model and new photo readings wait until the next month, said in one calm line; the text still gets a full answer. Above that, a hard monthly ceiling exists only to stop abuse: 4,000 messages on Plus and 12,000 on Unlimited, while Free rests at 1,500 until the month turns. Normal heavy use never comes close.
Voice and Talk are metered separately
Kata voices and Talk to Kata have their own, separate monthly allowance, not counted against your messages here: 60 interactions a month on Kata Plus, 400 on Kata Unlimited, none on Kata Free. The details are on the Voice page.
Usage is an aggregate message count tied to your account for billing. The content of what you said is never part of it. See What the servers do.