The Join Captcha Bot
@join_captcha_bot
FreeMULTI
International, open-source captcha bot: image or math verification for new group members. Free, multilingual, 18 thousand monthly users.
Key features
- Image or math captcha on join
- Post-captcha restrictions on media/links for new members
- Open source, multilingual
What The Join Captcha Bot does
The Join Captcha Bot verifies incoming group users are real humans through an image-based or math captcha before they can send messages. It is open-source and translated into a large number of languages, which makes it a solid pick for international communities where members speak different languages.
It also supports restricting new members from sending media, links or forwards for a grace period even after they pass the captcha, adding a second layer against accounts that get through verification but are still spam bots. Configuration happens through in-chat commands rather than a web dashboard.
How to start
- Add @join_captcha_bot to the group as admin
- Configure the captcha type with /captcha_mode
- Optionally restrict new members from posting links
Commands
/captcha_modeChoose the captcha type/helpFull command referencePricing and limits
Free
Pros / Cons
- Open source and auditable
- Extra restrictions for new members beyond just the captcha
- Command-based setup, less friendly than menu-driven bots
Alternatives
Read next
Score breakdown
| Criterion | Weight | Points | |
|---|---|---|---|
| Functionality | 25 | 8 / 10 | |
| Reliability & speed | 15 | 7 / 10 | |
| Popularity & trust | 15 | 6 / 10 | |
| Price & free tier | 10 | 10 / 10 | |
| Usability | 10 | 6 / 10 | |
| Safety & privacy | 10 | 8 / 10 | |
| Freshness | 5 | 6 / 10 | |
| Localization | 5 | 8 / 10 | |
| No intrusive ads | 5 | 9 / 10 | |
| Score | 100 | 75.0 |
FAQ
Is it free?
Yes, and the source code is publicly available.
Technical details
- Inline mode
- Mini App
- Works in groups
- Works in channels
- Accepts voice
- Accepts files
- Requires phone number
- Requires registration
- Shows ads
