The things that actually determine what a betting app costs you — pricing, limits, market depth and withdrawal reliability — and why the sign-up bonus is close to irrelevant.
Most rankings of betting apps are affiliate lists sorted by who pays the most per signup. The criteria that matter are boring, measurable and rarely mentioned, because they are not what the marketing budget is for.
An app is a shop. The only questions that matter are what it charges, whether it will let you buy, and whether it pays out.
The difference between -105 and -115 on the same bet is enormous over a season. At -110 you need 52.4% to break even. At -105 you need 51.2%. That 1.2% gap is larger than the entire edge most winning bettors have.
To compare two books, take both sides of the same market, convert each to implied probability, and add them. A total of 104% means the book is charging 4% to take your action. Anything at or under about 4% on major markets is competitive; 6% or more is expensive, and no promotion offsets paying that on every bet you ever make.
Having accounts at several books and taking the best available number on each bet is the most reliable edge available to a recreational bettor. It requires no model and no expertise — just the discipline to check before betting.
This is also why 'which app is best' is slightly the wrong question. The best app is whichever one has the best number on the bet you want right now, and that changes constantly.
Some books tolerate winning customers and some restrict them fast, cutting maximum stakes to a few dollars after a modest winning run. A book with slightly worse prices and no restriction policy can be worth more than a sharp-priced book that will not take your bets in three months.
This is genuinely hard to research before you have an account, and it is the single biggest difference between books over a long horizon. Community reports are imperfect but they are the only real source.
Reliability is not app-store rating. It is whether the book is licensed by a regulator with real enforcement in your jurisdiction, whether withdrawals process in days rather than weeks, and whether disputes have a path to a regulator rather than a support ticket.
An offshore book with better prices and no licence in your state is not cheaper. You are being paid a small pricing premium to accept counterparty risk on your entire balance.
Sign-up offers are real money, and they are also a one-time payment designed to move you onto a platform you will use for years. Compute what a 2% worse price costs you over a season of normal volume and compare it to the bonus. The bonus usually loses.
Read rollover requirements specifically. A bonus that requires wagering the amount several times over at minimum odds is not worth its face value, and sometimes is not worth anything at all.
Add both sides of a main market and check the hold. Confirm the regulator and that it covers your jurisdiction. Check the maximum stake on a market you would actually bet. Make one small withdrawal early, before you have a balance worth worrying about. Then keep at least two more accounts open so you can shop.