OK — been using this thing for something like four months now and it's stuck on my phone, so figured I'd say something since someone asked me last week. I'm based in the UK, generally bet football and racing, nothing mad, so take it how you like. The reason I started using it was honestly embarrassing — I couldn't ever figure out what an e/w return actually was when the place terms changed. I used to just wing it and then be surprised. Now I punch the numbers in before I place anything, even the boring singles. Their single bet calculator tool is the bit I use most — type in your stake, the odds and you get profit and total return with no faffing, fractional or decimal, doesn't matter. Same tool covers the multiples — doubles and trebles returns, a lucky 15, a yankee, which is where most people I know lose track. If you want a look, it's over at betting odds converter — free, no signup. What genuinely made a difference was the more serious bits. They've got an probability thing which shows you the overround, and there's the kelly criterion calculator — I stick to fractional kelly because full kelly is terrifying. Dutching calculator gets used a fair bit for when I'm splitting a race. It's not perfect mind. The interface feels very functional, let's say — zero frills, it's clearly function over form. On mobile it's fine though the bigger tables make you pinch and zoom. And no proper app, just the site — doesn't bother me but worth saying. Right, that's me. Costs nowt, not plastered in adverts, does what it says. Anyone who honestly adds it up in their head, give it a go — saves me a fair few dumb bets I'd have regretted.