Termius vs PuTTY: which SSH client should you use?

Termius vs PuTTY in one line

PuTTY is a free, no-frills SSH client for Windows that has worked the same way for 20 years. Termius is a modern, cross-platform client (Windows, Mac, Linux, iOS, Android) with sync, a nicer UI, and paid extras. If you only SSH from a Windows PC and want something free and minimal, PuTTY is fine. If you want one client across your computer and your phone, Termius — or a mobile-first option like TermAI — is the better fit.

Side by side

PuTTY — free, minimal, Windows

PuTTY's appeal is that it's free, tiny, and utterly dependable. It does SSH, Telnet, and serial; it doesn't sync, doesn't have an account, and doesn't try to be more than a terminal. The downsides: managing many servers means juggling saved sessions by hand, the UI hasn't modernized, and there's no official mobile version — the "PuTTY for Android/iPhone" you see in app stores are not from the PuTTY project (more on that here).

Best for: Windows users who want free and minimal.
Trade-off: no sync, no mobile, manual everything.

Termius — modern and cross-platform

Termius is what a lot of people move to from PuTTY: it syncs hosts, keys, and snippets across every device, has a clean UI, and runs on phones too. The trade-off is that the genuinely useful features (sync, SFTP, the AI assistant) live behind the Pro subscription, where PuTTY gives you the basics for free.

Best for: people who want one polished client everywhere and don't mind paying.
Trade-off: best features are paid. See Termius alternatives.

If you're really asking "how do I SSH from my phone?"

A lot of "Termius vs PuTTY" searches are from people who realized PuTTY has no mobile app and want to SSH from a phone. For that, a mobile-first client is the better answer. TermAI is built for the phone: it adds an AI assistant in the terminal (describe a task, get a command to review and run), built-in Tailscale to reach private servers, and the same app on iOS and Android — with a free tier.

How to pick

• Free, minimal, Windows-only → PuTTY
• One polished client across computer + phone → Termius
• SSH from a phone, with AI help → TermAI

FAQ

Is Termius better than PuTTY?
For cross-platform use and a modern workflow, yes — but PuTTY is free and perfectly good if you only need a basic Windows terminal. It comes down to whether you value sync, mobile, and UI over zero cost.

Is there a PuTTY for iPhone or Android?
No official one. Use a maintained mobile SSH client like Termius or TermAI instead of a look-alike app.

Is PuTTY still safe to use in 2026?
Yes, the official PuTTY is still maintained — just download it from the real site, not a third-party bundle.

Quick Facts

• PuTTY: free, open source, Windows, minimal, no sync, no mobile
• Termius: cross-platform, sync, modern UI, best features paid
• For phones: TermAI — mobile-first, AI assistant, built-in Tailscale, free tier
• Warning: app-store "PuTTY for mobile" apps are not official