I've been on Single Bet Calculator for the best part of a year, mainly on mobile, so make of that what you will. Found it through a Reddit thread, wasn't an ad.
The lobby is bigger than I expected — a bit over 3,500 titles if the counter is honest. Pragmatic Play takes up most of the space, so Book of Dead and the rest of the greatest hits all show up. Personally I mainly play Big Time Gaming megaways out of pure habit. The one thing that irks me — the search function on Single Bet Calculator is a bit rubbish, filters half work.
Live tables are Evolution-run, which is fine by me. Actual dealers, the stream holds up on 4G, and Crazy Time pulls a big crowd most evenings. Should mention the British tables are properly staffed from about 6pm onwards. If you want to compare the current terms it's worth a look over on single bet rather than taking my word for it.
Welcome offer on Single Bet Calculator is a 100% match to ?150 with 50 spins. Wagering is 40x nothing special but not predatory. I also got 20 no deposit spins on verification. Minimum is a tenner, registration was quick, verification took about 24 hours.
Payouts are decent. Debit card land in a couple of days, e-wallets hit in a few hours, and crypto clears fastest. Pulled ?180 out on Tuesday and it landed early. Support at Single Bet Calculator answered in about four minutes — copy-paste at first but fine after. They're UKGC licensed, so at least there's a complaints route. App-wise there's nothing, which is mildly annoying but the site works fine.