Right — been using this thing for something like six months now and it's stuck on my phone, reckon I'd say something since a lad on another thread asked me last week. I'm based in the UK, generally do football and horses, nothing mad, for context. The reason I started using it was honestly pretty stupid — I could never get my head round what an each way payout actually was when the place terms changed. I'd just guess and then be surprised. Now I type the odds in before every slip, even the boring singles. The single bet calculator tool is the part I use most — you put in stake and odds and it spits out returns instantly, fractions or decimals. There's also the multiples — doubles and trebles returns, lucky 15s, patents and yankees, which is where I always lose track. If you fancy a poke about, it's here accumulator odds calculator and there's no login wall, which I appreciated. The thing that really made a difference were the nerdier extras. There's an odds-to-probability calculator and it makes obvious the overround, and there's the kelly criterion calculator — I stick to fractional kelly since full stakes are terrifying. The dutching one gets used a fair bit if I'm covering two or three runners. Not all sunshine though. The layout feels very functional, let's say — no frills, which honestly I don't mind but some will. On mobile it works though the acca grid make you pinch and zoom. Also there's no proper app, it's browser only — fine by me but worth saying. Anyway. Costs nowt, no ads shoved in your face, does what it says. If you honestly does the maths on paper, give it a go — saves me a load of arguments with the bookie.