Count Trainer

Cards are dealt one at a time and the app checks whether you are keeping the Hi-Lo count correctly. Free, no account, runs entirely in your browser.

The Hi-Lo values

2 3 4 5 6Low cards count as +1

7 8 9Neutral cards count as 0

10 J Q K AHigh cards count as −1

A 52-card deck holds twenty +1 cards and twenty −1 cards, so counting a whole deck correctly always ends at zero. That is the first thing worth checking yourself against.

What a session looks like

Cards are dealtOne at a time, at the speed you set. Add each Hi-Lo value to your count as it appears.

You get quizzedEvery few cards the drill pauses and asks for your running count, and optionally the true count.

You see the numbersAccuracy, average answer time and longest streak are recorded, so you can tell whether you are improving.

Set it up

SettingsDecks, card speed, quiz frequency, difficulty›

StatsAccuracy, response times and streaks per session›

How counting worksRunning count, true count, worked examples›

Install it

On iPhone and iPad, tap the Share button in Safari and choose Add to Home Screen. On Android Chrome, open the browser menu and choose Add to Home screen.

It then opens full screen and works without a connection.

What this is for

This is a drill for the arithmetic: keeping a running count under time pressure and converting it to a true count. It is a practice tool, not betting advice and not a strategy guide.

Nothing you do here is stored anywhere except your own browser.

Start drill