Join Captcha Bot moderation bot
In short
Public group admins have relied on this one for years: set up in a minute and the wave of spam bots drops right away. We like how narrowly focused it stays: captcha, nothing else bolted on. The trade-off is a bit more friction for real newcomers.
About the bot
If accounts pushing casinos and crypto pour into your group every day, Join Captcha Bot is probably what you're after. It's a utility bot: you add it to the chat as an admin, and from then on it greets every new member with a little test.
The newcomer sees an image with characters and has to type them back. Get it right in time and you stay and chat as usual. Miss it or get it wrong and the bot removes you. That's exactly the step where spam bots tend to trip up.
As far as we know, the project is open source, and its settings let you change the language and the time allowed for an answer. The bot posts updates in its own info channel, which is worth checking if something breaks after a Telegram update.
The downside of any captcha is that real people sometimes miss the message and get kicked. Set a sensible timeout and pin a short note in the group. It won't stop a real person who passes the test and then posts junk; human moderators or keyword filters handle that part.
You'll like it if
- spam accounts flood your open group week after week
- you want a simple check without a complex dashboard
- open-source tools matter to you
Skip it if
- your group is private and invite-only
- you need a full moderator with word filters and warnings
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