So — been on this thing for maybe five months now and it's stuck on my phone, so figured I'd chuck my thoughts in since a lad on another thread asked me last week. Am in the UK, mainly bet football and racing, nothing mad, for context. The reason I started using it was actually pretty stupid — I could never get my head round what an e/w payout actually came to with 1/5 odds a place. Basically I'd guess and moan when the payout landed. These days I punch the numbers in before I place anything, even a simple single bet. Their single bet calculator is the bit I'm on daily — type in the price and your stake and you get profit and total return straight away, fractional or decimal, doesn't matter. Same tool covers the bigger stuff — trebles returns, lucky 15 and lucky 63, patents and yankees, honestly that's where I always lose track. If you want a look, it's over at super heinz betting calculator — free, no signup. What really shifted things for me was the nerdier bits. They've got an odds-to-probability thing that shows what margin's baked in, plus a kelly criterion tool — I stick to fractional kelly because full kelly is far too aggressive. Dutching calculator is decent for when I'm spreading across selections. Couple of gripes. The design is very functional, let's say — no flash, looks like it was built by someone who cares more about maths than colours. On my phone it works but the bigger tables are a squeeze. And nothing on the app store, it's browser only — doesn't bother me but worth saying. Right, that's me. Costs nowt, barely any ads, works. If anyone honestly adds it up in their head, give it a go — it's saved me a fair few arguments with the bookie.