So — been on this thing for maybe six months now and it's stuck on my phone, so figured I'd write something up since someone asked me the other day. Am based in the UK, generally do football and horses, small stakes, just so you know where I'm coming from. What got me on it was honestly pretty stupid — I never could work out what an ew return actually came to when the place terms changed. I'd just wing it and then be surprised. Now type the odds in before every slip, even a simple single bet. Their single bet calculator tool is the one I'm on daily — type in your stake, the odds and it shows returns instantly, either odds format. Same tool covers the bigger stuff — doubles and trebles returns, lucky 15s, patents and yankees, and that's where most people I know mess it up. Have a go yourself, it's here super heinz bet calculator and it's free with no account nonsense. One thing that genuinely changed how I bet is the more serious tools. The odds-to-probability converter which shows you how much the bookie's taking, plus a kelly staking tool — I use half kelly since full stakes are far too aggressive. Dutching calculator gets used a fair bit if I'm spreading across selections. Not all sunshine though. Its design feels a bit basic — not much polish, looks like it was built by someone who cares more about maths than colours. On my phone it's usable though the bigger tables make you pinch and zoom. And nothing on the app store, just the site — slight shame but worth saying. So yeah. Doesn't cost anything, barely any ads, does the job. Anyone who honestly works out returns on a calculator app, have a look — it's saved me a load of "wait, that's it?" moments.