Been using Single Bet Calculator for about four months now, mostly in the evenings after work, so this is just my experience. The game selection is properly stacked — somewhere around 2,500 titles going by the counter, and the usual suspects present: NetEnt, Play'n GO, Betsoft. Sweet Bonanza and Book of Dead get most of my spins, although I've had more luck on the Megaways stuff.
The welcome offer is 100% up to ?500 plus 100 free spins, with wagering at 35x on the bonus. Honestly, I only cleared it because I was playing anyway — the spins expire in 72 hours on the spins, and that caught me out. There's a small no deposit thing too — around 20 spins when you complete KYC, nothing life-changing but free is free.
The live tables get more of my money than the slots do. Evolution power it, meaning you've got real croupiers, loads of roulette and blackjack seats, plus stuff like — Crazy Time being the obvious one. Streams hold up fine on 4G, which is more than I can say for a couple of other sites. You can see what's running right now over on bet calculator double before you deposit.
Withdrawals from Single Bet Calculator have been quick enough — e-wallet took under 12 hours both times, debit card ran the usual couple of days. They take Visa, Mastercard, e-wallets and Bitcoin, minimum's ?10. Verification was the annoying bit — passport and proof of address and it sat there two days.
Took maybe three minutes to open the account, they hold a UK licence so the usual deposit limits and reality checks are there. There's no dedicated app, the mobile site just works in the browser and honestly I don't miss it. The live chat at Single Bet Calculator is 24/7 live chat, but you'll wrestle with an automated agent before a human shows up. Once you get a person they're fine.