Free online play-testing
Play-test Vs System online.
Vs System on Untap.in: a free online simulator with a full card database, deck builder, and live multiplayer. Build a deck, shuffle up, and play-test against real opponents — no downloads, straight from your browser.
Play-test Vs System nowfree · in your browser
Everything you need to play-test Vs System
Deck builder
Search the full Vs System card pool, tune your list, and share decks with friends. Import from text or by URL from popular deck sites.
Live multiplayer
Create a table or join an open game from the public lobby. Play-test Vs System with friends or meet new opponents around the world.
Solo play-testing
Goldfish opening hands, test mulligans, and rehearse your lines against an empty seat before taking a deck to a real table.
Spectate games
Watch live matches to pick up the meta, or have a friend watch your game and coach from over your shoulder.
Any device, no install
Runs in the browser on desktop, tablet, and phone — installable as an app, nothing to download or patch.
Frequently asked questions
Is play-testing Vs System on Untap.in free?
Yes. Untap.in is free to play-test — build decks, goldfish, and join live multiplayer games at no cost. Optional supporter perks help keep the servers running.
Do I need to download anything to play-test Vs System online?
No. Untap.in runs entirely in your web browser on desktop, tablet, and phone. You can also install it as an app straight from the browser.
Can I import my existing Vs System decklists?
Yes. Paste a plain-text decklist or import directly from popular deck-building sites by URL, then start play-testing right away.
Is Untap.in affiliated with the makers of Vs System?
No. Untap.in is an independent fan-built play-testing platform and is not affiliated with or endorsed by the publisher of Vs System.