Generally, Tuvis doesn’t have any limit (upgraded users).
Every WhatsApp user must be compliant with their Terms of Use - which are limiting the total number of messages you can send every day and for people you don’t know.
Also - Tuvis should not be used for marketing purposes over WhatsApp, meaning - users are not allowed to do any type of bulk or automated messaging over WhatsApp with or without Tuvis.
We do have a limit for the product regarding the number of custom fields you can include in the Agent Panel layouts (10 per every layout).