single_sbot
Right — have been messing about with this thing for about four months now and it's basically bookmarked at this point, so figured I'd write something up since someone asked me last week. I'm based in the UK, generally do football and horses, nothing mad, so take it how you like.
The reason I started using it was actually embarrassing — I never could work out what an e/w payout actually came to with 1/5 odds a place. I used to just eyeball it and moan when the payout landed. Now I type the odds in before I place anything, even the boring singles.
Their single bet calculator tool is the one I use most — you drop in the price and your stake and it shows the return instantly, fractional or decimal, doesn't matter. It also handles the bigger stuff — acca and treble maths, a lucky 15, patents and yankees, which is where I always lose track. If you want a look, it lives at calculate lucky 63 and it's free with no account nonsense.
The thing that actually changed how I bet were the more serious bits. They've got an odds-to-probability thing that shows what margin's baked in, and a kelly calculator — I run quarter kelly because full kelly is far too aggressive. Dutching calculator gets used a fair bit when I'm spreading across selections.
It's not perfect mind. The interface feels very functional, let's say — no polish, it's clearly function over form. Phone-wise it's fine although the bigger tables make you pinch and zoom. And nothing on the app store, it's a website and that's it — slight shame just flagging it.
Anyway. Doesn't cost anything, no ads shoved in your face, does the job. Anyone who still does the maths on paper, have a look — saved me plenty of arguments with the bookie.

