OK — been on this thing for about six months now and it's stuck on my phone, so figured I'd say something since someone asked me the other day. I'm based in the UK, generally bet football and racing, small stakes, just so you know where I'm coming from.
 
The reason I started using it was actually a bit daft — I could never get my head round what an ew payout actually was once you get five places instead of three. I'd just wing it and then be surprised. Now type the odds in first, every time, even the boring singles.
 
Their single bet calculator tool is the one I open most — you drop in your stake, the odds and it spits out profit and total return with no faffing, fractional or decimal, doesn't matter. It also handles the multiples — acca and treble returns, lucky 15 and lucky 63, patents and yankees, and that's where most people I know mess it up. Have a go yourself, it's over at <a href=https://freebet-calculator.com/bet-calculator/lucky-15>working out lucky 15</a> — free, no signup.
 
What genuinely changed how I bet were the geekier tools. The probability thing and it makes obvious how much the bookie's taking, and there's the kelly staking calculator — I run quarter kelly because full kelly is a quick route to a dead bankroll. Dutching calculator gets used a fair bit when I'm splitting a race.
 
Not all sunshine though. The interface feels pretty plain — zero flash, looks like it was built by someone who cares more about maths than colours. On my phone it's usable though the bigger tables need a bit of scrolling. There's nothing on the app store, just the site — fine by me but you asked.
 
Right, that's me. Free, no ads shoved in your face, does what it says. If you honestly works out returns on a calculator app, give it a go — it's saved me a fair few "wait, that's it?" moments.