⚡ Reflex in your browser

The browser is the most underrated game console ever shipped: it's already on every device you own, it updates itself, and it starts games in seconds. Reflex was built for it — not ported to it — which is why a pure reaction time duel feels identical on a gaming PC and a mid-range phone.

One game, every device

Chrome, Safari, Firefox, Edge; Android, iPhone, Windows, Mac, Linux, Chromebook — same rounds, same scoring, same leaderboards. Start a duel on your laptop, answer a rematch from your phone in a queue. Nothing syncs because nothing needs to: the game lives at one URL and meets you wherever you open it.

Why browser-native suits Reflex

A game about pure reaction time needs instant availability more than it needs a 4K install. The browser delivers exactly that trade: page-load in seconds, input latency low enough to measure milliseconds honestly, and a share model — plain links — that turns any chat thread into an arena. The heaviest thing about the whole site is your opponent's ego.

How to play Reflex

  1. A block appears red. Both players wait — fingers hovering, nerves fraying.
  2. After a randomised delay it snaps to green. Tap immediately.
  3. Your time is measured in milliseconds from the colour change to your tap.
  4. Tap while it's still red and you forfeit the round — anticipation is the cardinal sin.

Play Reflex now

30-second duels, free in your browser. No download, no signup.

Play now — free

Frequently asked questions

Which browsers run Reflex?

Any modern one — Chrome, Safari, Firefox, Edge, and their mobile versions. If it can open this page, it can run the game.

Browser vs app — is there an app version?

The browser version is the game. No app exists because none is needed: full features, leaderboards and duels all run from the URL.

Does it work on old or weak devices?

Yes — the whole game is lighter than a single photo and runs comfortably on years-old phones and basic Chromebooks.

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