# 21 Trainer — Beat the man > Card counting practice game for blackjack players. (iPhone/iPad app by Bulletproof Entertainment.) - Source: https://appshunter.io/ios/app/21-trainer/id1309810444 (this page in markdown: same URL + `.md`) - Developer: [Bulletproof Entertainment](https://appshunter.io/developer/1309810443) - Category: Entertainment, Games, Card, Casino - Price: Free - Rating: 3.40/5 from 20 App Store ratings · 13 written reviews indexed - Age rating: 17+ - Requires: iOS 9.0 · 37 MB - Languages: American English - Released: 2017-11-10 - Data updated: 2026-06-07 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/21-trainer/id1309810444/reviews.md ## What is 21 Trainer? Want to learn how to count cards? This game will help you getting better and beat the game of blackjack. Features: - Challenge yourself to count as many cards as possible in 30 seconds ## Key features - Card counting practice - 30-second challenges - Blackjack game improvement - Beat the dealer strategy ## Recent user reviews (10 of 13) All indexed reviews: https://appshunter.io/ios/app/21-trainer/id1309810444/reviews.md ### 4/5 — Cool app *2024-03-16* Nice app with nice aesthetic but needs to be tested for bugs. There are lots of bugs and exact same cards shouldn’t be able to appear subsequently. ### 4/5 — Good but could be better *2023-03-14* I wrote a counting practice program for the pc but purchased this because I’m not an iOS coder. I have 2 problems. First, sometimes it shows the same card twice. I thought i hadn’t advanced to the next card so tapped again to advance the card. Consequently my count was off. It shouldn’t show the same card twice. Second, I think it counts the last card before showing it. Since the time is up. It asks for the count and never does show the last card. This should be fixed. Otherwise it’s a great practice app. ### 4/5 — Well made. A couple of flaws. *2023-01-12* Not being able to see the last card on top after the thirty seconds is a HUGE problem. Often I will click for a new card as soon as the time is up and it takes the new card into account, even though I didn't see it, or if I did it was for a fraction of a second, ruining the test. Also not giving a sound que or visual que for a new card that is the same as the one before it often gets me mixed up because I think my tap didn't register leading me to skip a count. ### 1/5 — Math is wrong! *2022-08-30* Lol first off the pictures of the cards In the instructions are wrong. There’s no 6 card just 2 fives. Also the count is off very often. ### 4/5 — Could be better *2020-11-02* Good app. It would be great if it gave the actual count when incorrect. ### 1/5 — Hack *2020-09-16* I got the global high score in just a couple minutes by spamming the button and guessing the number I never got to pick my name for the high score so it’s stuck as diamond Dana ### 4/5 — The app is good to start the raining of card counting for beginners. *2020-07-08* One improvement can be added display the correct count when the user miscount ### 2/5 — Very very basic needs more to be useful *2020-02-20* So I like the simplicity of this. Try your best to count as many cards in 30 seconds. But like a lot of others mentioned on here, it needs to show how far you were off on the count, not just wrong. Cause I could swear I’m right sometimes and it just tells me I’m wrong. Makes me wonder if there is a bug in its count or maybe I’m messing up somewhere. Also it’s be nice if there was more ways to count them a single flip deck. Like if there was an actual poker table with hands and a dealer. May help to shift your eyes around. ### 2/5 — Good... but how will I learn? *2020-01-02* It’s decent for learning cards quick. But it just says wrong or right... there is no teaching. And there is no telling what the count was if you’re wrong. Needs that in an update. ### 4/5 — Great app for on the go *2019-11-23* Great app for on the go counting. I really wish it told me how far off I was when I miss the correct count. It would also be an amazing feature to “review your deck” at the end of the 30 sec. This feature would show you where you went wrong. ## Frequently asked questions about 21 Trainer ### What is 21 Trainer? 21 Trainer is a game designed to help you practice card counting to improve your blackjack strategy. It offers timed challenges to test your counting speed and accuracy. ### How long are the challenges in 21 Trainer? Each challenge in 21 Trainer lasts for 30 seconds, during which you aim to count as many cards as possible. ### What devices does 21 Trainer support? 21 Trainer is available for iPhone and iPod devices. ### What is the age rating for 21 Trainer? 21 Trainer has an age rating of 17+, likely due to its association with casino-style games. ### When was 21 Trainer last updated? The latest version of 21 Trainer was released on December 10, 2020. ### Does 21 Trainer have ads? No, 21 Trainer does not contain advertisements. ### What is the user rating for 21 Trainer? 21 Trainer has an average rating of 3.4 stars based on 20 ratings. ### Can 21 Trainer be played offline? The provided information does not specify if 21 Trainer can be played offline, but card counting games typically do not require an internet connection. ## Version history (last 5 releases) ### 1.0.15 — 2020-12-10 Fixed a bug where you where not able to see your high scores. ### 1.0.14 — 2019-12-09 Bug fixes. ### 1.0.13 — 2019-11-22 Bug fixes. ### 1.0.12 — 2018-12-04 Bug fixed again. ### 1.0.11 — 2018-12-03 Bug fixes in high scores. 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User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-07.*