# BrainHack > Interpreter for the esoteric B*******k programming language. (iPhone/iPad app by Katsuma Tanaka.) - Source: https://appshunter.io/ios/app/brainhack/id959976921 (this page in markdown: same URL + `.md`) - Developer: [Katsuma Tanaka](https://appshunter.io/developer/507370114) - Category: Utilities, Productivity - Price: Free - Rating: 4.17/5 from 6 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 11 MB - Languages: English - Released: 2015-04-24 - Data updated: 2026-06-02 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/brainhack/id959976921/reviews.md ## What is BrainHack? BrainHack is an interpreter app for B*******k. The B*******k programming language is an esoteric programming language noted for its extreme minimalism. It is a Turing tarpit, designed to challenge and amuse programmers, and was not made to be suitable for practical use. It was created in 1993 by Urban Muller. Commands: > increment the data pointer (to point to the next cell to the right). < decrement the data pointer (to point to the next cell to the left). + increment (increase by one) the byte at the data pointer. - decrement (decrease by one) the byte at the data pointer. . output a character, the ASCII value of which being the byte at the data pointer. , accept one byte of input, storing its value in the byte at the data pointer. [ if the byte at the data pointer is zero, then instead of moving the instruction pointer forward to the next command, jump it forward to the command after the matching ] command. ] if the byte at the data pointer is nonzero, then instead of moving the instruction pointer forward to the next command, jump it back to the command after the matching [ command. ## Key features - B*******k programming language interpreter - Execute esoteric code - Minimalist programming language support - ASCII character output - Byte input and manipulation ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/brainhack/id959976921/reviews.md ### 4/5 — Perfect with one bug *2021-06-07* I love this app it’s good but I found a bug I was making a truth machine with the following code ,.>++++++++++++[-<---->]++++++++++++<-[]+>[-<++++>]+[<.>] It ran fine on my and other compilers but when I tried in the app it dident The bug is how when the cell is not 0 it shouldn’t continue in a loop but it did I hope u can fix it ### 4/5 — Nice app *2019-09-21, version 1.1.0* Overall, amazing app, however, the ability to add comments would be amazing. ### 4/5 — Works great! Has a handy built-in bf keyboard *2019-03-09, version 1.1.0* Like others have mentioned, it needs to show current position of the data pointer. Would be nice to have cursor controlls and copy/paste. Also good would be a larger array. ### 4/5 — Good, But Change One Thing *2017-12-19, version 1.1.0* plz make an indicator to show which box you are currently in when running the program. Also, when I tried to send feedback the app crashes. One more feature would be a “undo” button, like ctrl+z ### 4/5 — Great *2016-12-28, version 1.1.0* Really fun, would be great to have Ook and spoon variants^^ ### 5/5 — Great ! *2016-11-17, version 1.1.0* This brainf interpreter works really well and the live state of every memory cell is very handy. Try that out (enter a two digits number, for 10, enter 1 and then in the second entry enter 0. For 2 enter 0 and then 2) : >+++++++[-<+++++++>]<->>,<<[->+>-<<]>>[->>>++++++++++<<<],<[-<+>>-<]>[->>>+<<<]+++++++[-<++++++>]>>>[->+<<+<+<<.>>>>]>--<<<--<++++++++++.>>>>>++++++++++++++++++++++++++++++++<<<<[-<<.>>>>>[-<+>>.<]<[->+<]<<<<.>><.>]>[-<<<.>>>] ++++++++++. ### 5/5 — Excellent! *2016-01-04* Easy debugging with the visible tape and step by step mode. Great app! ### 4/5 — Fantastic app! *2015-07-21, version 1.1.0* Being able to watch the program be interpreted in real time is very well done. The only feature I'd ask for is an identifier of where the pointer is. Maybe, the current byte is surrounded by a square to highlight it? Just a suggestion. The file system is exactly what I'm looking for: very simple and effective. The helper keyboard is very effective, it makes the a programming a lot easier. The ASCII table could be easier to access, though. I'd say in general: ++++++++++[>+++++++>+++++++++++>++++++++++>+++<<<<-]>+.>++++.>+.----.<++.>>++.<.<----..>>+. Thanks for developing this! :) ### 4/5 — Amazing app *2015-07-14, version 1.1.0* This application is great for the price. There haven't been any problems so far that I can see. I've made a Hello World and a number multiplier. 2 features I would recommend is the option to enter numbers directly instead of their Ascii counterparts, and a better ability to handle multiple character input. I don't know the specification, but I think it should enter each character separately until it reaches the end of the user's input then place a 0 in the final cell. Great other than that though! ## Frequently asked questions about BrainHack ### What is BrainHack? BrainHack is an interpreter application designed specifically for the B*******k programming language. It allows users to write and execute code written in this unique and minimalist esoteric language. ### Is BrainHack free to use? Yes, BrainHack is available for free. There are no costs associated with downloading or using the application. ### What devices does BrainHack support? BrainHack is supported on iPhone and iPod devices. It is designed for iOS users who want to experiment with B*******k programming. ### How often is BrainHack updated? The latest version of BrainHack, 1.1.0, was released on June 2, 2015. While updates have not been frequent recently, the app provides a stable interpreter for B*******k. ### What is the age rating for BrainHack? BrainHack has an age rating of 4+. This indicates it is suitable for a wide range of users, including younger individuals interested in programming concepts. ### Does BrainHack have ads? No, BrainHack does not contain advertisements. Users can enjoy an uninterrupted experience while interpreting B*******k code. ### What are the core commands supported by BrainHack? BrainHack supports the core B*******k commands: '>' (increment data pointer), '<' (decrement data pointer), '+' (increment byte), '-' (decrement byte), '.' (output character), ',' (accept input), '[' (jump if zero), and ']' (jump if not zero). ### What is the purpose of the B*******k language interpreted by BrainHack? B*******k is an esoteric programming language created in 1993 by Urban Muller. It is known for its extreme minimalism and is designed to challenge and amuse programmers, not for practical application. ## Version history (last 2 releases) ### 1.1.0 — 2015-06-02 This app has been updated by Apple to display the Apple Watch app icon. - Add interpreter speed setting ### 1.0.0 — 2015-04-22 No release notes. ## Apps similar to BrainHack | App | Rating | Price | Category | | --- | --- | --- | --- | | [Clarity2Go](https://appshunter.io/ios/app/clarity2go/id534532033) | — | Free | Utilities | | [OneCryption](https://appshunter.io/ios/app/onecryption/id1399893476) | 5.0 (1) | Free | Utilities | | [Shop With Brian](https://appshunter.io/ios/app/shop-with-brian/id1590742189) | — | Free | Utilities | | [555 Calc](https://appshunter.io/ios/app/555-calc/id868058244) | 4.0 (3) | Free | Utilities | | [Operational Amplifiers Pro](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953) | 5.0 (1) | $4.99 | Utilities | | [QR Generator—Fast Code Maker](https://appshunter.io/ios/app/qr-generatorfast-code-maker/id6477485258) | — | Free | Utilities | ## More apps by Katsuma Tanaka - [Rexif](https://appshunter.io/ios/app/rexif/id1042612936) All apps by Katsuma Tanaka: https://appshunter.io/developer/507370114 ## Related topics [katsuma tanaka](https://appshunter.io/ios/topics/katsuma-tanaka) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-02.*