The best Telegram anti-spam bot is the one that covers the whole path a spammer takes.

Group spam is a sequence, not a single event. Scripted accounts join open groups by the dozen. Some drop promo links immediately; some harvest your member list and move the scam into private messages; some sit quiet for weeks inflating your member count before they wake up. Along the way you get copy-paste floods, phishing links and the classic fake-admin trick where someone renames themselves to look like your team.

A tool that only checks the door will miss most of that. Use this as the checklist when you compare any option:

• The join: is there newcomer verification, and does it remove accounts that never verify?
• The message: are scam and promo posts removed automatically, or only when an admin writes a rule?
• The link: is every shared URL actually checked against a phishing and malware database, or just pattern-matched?
• The flood: do copy-paste repeats and bursts get cool-downs?
• The raid: when a wave of accounts arrives at once, does anything close the group automatically?
• The DM scam: is anyone watching for members who rename to mimic an admin?
• The gray areas: is there a fair warning ladder for the calls only a human should make?
• The cost: which of those layers are actually free, and which are behind a plan?

Limzo answers yes to every line, on the Free plan.

1. Limzo: our pick for protection that runs itself. Limzo covers every step of the path above: newcomer verification at the join, automatic scam and promo removal, a link safety scan that checks every shared URL against a continuously updated database of known phishing and malware sites, flood and duplicate control, /warn warnings with automatic enforcement, a fake-admin impersonator guard, raid protection, an optional language lock and a cross-group network shield. Every layer is on the Free plan and works from smart defaults, so there is no rule syntax or trigger chain to maintain. Analytics, levels and weekly highlights come in the same admin slot. Details: the full anti-spam stack.

The rest of the field. Rose, Combot, Group Help and ChatKeeper are command-driven: they can block a lot once your admins write and maintain the rules. Shieldy is a narrow captcha bot that guards the door and leaves link spam, floods and impersonation to you. Head-to-head: Limzo vs Rose, Limzo vs Combot, Limzo vs Group Help and Limzo vs ChatKeeper.

• Nothing to configure. Every layer runs from smart defaults, with one switch per layer.
• Verification that stays shut. One tap inside the chat, no web page to load, so it works on every Telegram app and connection. An account removed for not verifying is checked again if it rejoins.
• Built to avoid false alarms. Admins and trusted users are always exempt, a borderline message is left alone rather than deleted, and any mute or ban is one tap to undo from Recent actions in the Mini App.
• Welcomes that do not ping everyone. People who join close together get one shared welcome, and it can delete itself.
• Free where it matters. Every protection layer is on the Free plan, with no daily scanning quota and no ads in your group.
• Your members’ messages stay private. Nothing is sent to an AI service.