Right — been on this thing for something like five months now and it's stuck on my phone, reckon I'd write something up since a lad on another thread asked me last week. I'm based in the UK, mainly do football and horses, small stakes, just so you know where I'm coming from.

The reason I started using it was genuinely embarrassing — I couldn't ever figure out what an ew payout would be once you get five places instead of three. Basically I'd wing it and get a shock. Now type the odds in first, every time, even a simple single bet.

Their single bet calculator tool is the part I open most — type in the price and your stake and you get profit and total return instantly, fractional or decimal, doesn't matter. Same tool covers the multiples — trebles maths, lucky 15s, yankees, and that's where most people I know lose track. Have a go yourself, it's over at bet exchange calculator and it's free with no account nonsense.

One thing that actually changed how I bet were the geekier bits. They've got an probability converter and it makes obvious the overround, and there's the kelly criterion calculator — I stick to fractional kelly since full stakes are a quick route to a dead bankroll. The dutch tool is decent when I'm spreading across selections.

Couple of gripes. The design looks pretty plain — no polish, it's clearly function over form. Phone-wise it's fine though the bigger tables make you pinch and zoom. Also there's nothing on the app store, just the site — fine by me but worth saying.

So yeah. Doesn't cost anything, not plastered in adverts, does the job. If you honestly works out returns on a calculator app, try it — saved me a load of dumb bets I'd have regretted.