DaySandBox

DaySandBox takes a different approach from a captcha challenge at the door: new members are let in immediately but placed in a temporary sandbox, where their messages stay hidden from the rest of the group until enough signals suggest they are a genuine participant rather than a spam bot. This avoids the friction of an explicit puzzle for real newcomers while still filtering out automated accounts.

Its own Telegram profile carries only Telegram's generic group-bot description rather than a custom bio, so the sandbox mechanic described here is based on the bot's established reputation rather than its own written claims — test it in a low-stakes group first if you want to confirm the exact behaviour.