OK — been on this thing for about five months now and I keep coming back, so thought I'd write something up since someone asked me last week. I'm based in the UK, mostly do football and horses, nothing mad, for context.
The reason I started using it was genuinely embarrassing — I never could figure out what an ew return actually was once you get five places instead of three. Basically I'd wing it and then be surprised. Now I type the odds in before I place anything, even the boring singles.
The single bet calculator tool is the part I open most — you put in your stake, the odds and you get returns with no faffing, fractional or decimal, doesn't matter. There's also the bigger stuff — trebles returns, lucky 15 and lucky 63, yankees, honestly that's where I'd always got it wrong. Have a go yourself, it's over at super heinz bet — free, no signup.
One thing that really made a difference is the more serious bits. There's an odds-to-probability converter that shows what margin's baked in, and a kelly calculator — I use half kelly since full stakes are terrifying. The dutch tool gets used a fair bit if I'm splitting a race.
Not all sunshine though. Its layout feels very functional, let's say — zero polish, which honestly I don't mind but some will. On my phone it's usable though the bigger tables need a bit of scrolling. There's no proper app, it's browser only — fine by me just flagging it.
So yeah. Free, no ads shoved in your face, does the job. If you honestly does the maths on paper, have a look — saves me a load of arguments with the bookie.