The Telegram captcha bot that keeps bots out — without annoying humans.
New members are muted the moment they join and get one friendly message with a single button. Tap it, and they’re chatting in seconds; stay silent, and they’re removed a few minutes later. No image puzzles, no maths quizzes — and it’s free on every plan, inside the bot that already runs your group’s stats.
One tap, zero puzzles
The check is a single “I’m human” button — the interaction spam bots never perform, and the one real people finish in two seconds. No distorted letters, no fire-hydrant photos, no friction that makes genuine newcomers give up at the door.
Muted until verified, gone if not
Joiners can’t post until they tap the button, and anything a scripted account squeezes in before the mute lands is removed automatically. Members who never verify are removed after a few minutes — rejoining simply restarts the check, so a human who missed the window is never locked out.
Raid-tidy by design
When several accounts join at once, they share a single verification message instead of flooding the chat with prompts. The prompt cleans itself up once everyone is resolved — a bot raid leaves behind muted accounts, not a wall of captcha spam.
Why groups need a captcha at the door
Most Telegram spam never starts with a message — it starts with a join. Scripted accounts enter open groups by the dozen to drop promo links, harvest members for private-message scams, or simply sit there inflating your member count until they wake up weeks later. Once they’re inside, every defence is playing catch-up.
A join captcha stops the problem at its cheapest point: the door. Automated accounts fail the one thing they’re not built to do — respond to an interactive prompt — while your real newcomers barely notice the step. Groups that get raided, crypto and trading communities, and any group with an open invite link benefit the most.
How Limzo’s newcomer verification works
Turn it on once in the Mini App under Moderate — it’s off by default, so nothing changes until you decide. From then on, every new member is muted the moment they join and greeted with one message: tap the button to start chatting. Tapping unmutes them instantly. Anyone who doesn’t verify within a few minutes is removed — and can simply rejoin to try again, so there’s nothing for an admin to clean up manually. Admins are exempt, simultaneous joiners share a single prompt, and even messages that slip in before the mute takes hold are removed automatically.
Verification is one layer of Limzo’s smart moderation: scam-message detection, link and flood control, a link safety scan, member warnings (/warn), a fake-admin impersonator guard, and a cross-group network shield all run alongside it — so the rare spammer who passes the captcha still meets the rest of the wall. And it’s free on every plan, because member safety shouldn’t sit behind a paywall.
Button captcha vs. image puzzles — an honest take
Distorted-text and pick-the-traffic-light captchas punish the wrong crowd. Telegram spam bots are defeated by any required interaction — they join and post, nothing more — so a single button stops them just as cold as a puzzle, while your human newcomers keep a friendly first impression. That’s why Limzo deliberately ships a one-tap check rather than a quiz.
Two honest limits, and they apply to every captcha bot. A human spammer who taps the button gets in — that’s what the anti-spam layer behind the door is for. And no bot can verify members who joined before it was enabled. If join-gating is the only thing you need, a single-purpose tool like Shieldy does that one job well; Limzo’s case is doing the same job inside the bot that already runs your stats, levels, and weekly highlights — one admin slot instead of five.
Common questions
Try it on your own group.
Add Limzo, and this week your group gets its first highlights post, its first badges, and a public stats page worth sharing. Free plan included — Pro is $9/month when you need more.
