# Processing & p5.js iCompiler — user reviews > 162 indexed App Store user reviews of Processing & p5.js iCompiler by riedel.wtf apps S.L., rated 3.50/5 from 80 ratings. - Source: https://appshunter.io/ios/app/processing-and-p5js-icompiler/id648955851/reviews - App overview in markdown: https://appshunter.io/ios/app/processing-and-p5js-icompiler/id648955851.md - Rating breakdown: 5★ 32 · 4★ 15 · 3★ 7 · 2★ 13 · 1★ 13 ## What do users think of Processing & p5.js iCompiler? Overall sentiment: mixed **Pros** - ✅ Works offline without internet connection - 👍 Free app with no mandatory payment - 🎨 Good for quick creative coding and sketches - 📱 Portable Processing development on mobile - ⚡ Relatively fast performance for mobile IDE - 📋 Copy/paste functionality works well - 🎯 Simple and intuitive interface for beginners - 🔄 Recent updates have improved stability **Cons** - 🚫 Compiler errors hidden behind paywall - 🐛 Data loss and code deletion issues - ❌ No error messages or debugging output - 📝 Poor syntax highlighting (highlights wrong keywords) - ⌨️ No auto-indentation or code formatting - 💾 Unreliable save functionality - 🔴 Black screen on errors with no feedback - 📚 Limited library support - 🔧 Incomplete feature implementation - ⚠️ Functions with parameters don't work - 🚨 Multi-file projects not properly supported - 🖥️ Portrait-only mode, no landscape support - ⏱️ Significant lag with large projects - 🔌 Viewport jumps when typing mid-file **Commonly reported bugs** - Code reverts to earlier versions after app sleep - Changes lost when phone falls asleep - Functions with parameters cause black screen - StringList data type not recognized - Boolean highlighting shows 'bool' instead of full word - Else statements break code formatting - Try/catch blocks don't work properly - Cursor position jumps unexpectedly while typing - Screen scrolls to bottom when typing mid-file - Swipe-to-go-back gesture interferes with drawing - mouseClicked() event fires multiple times per click - Import folder feature doesn't work - Cannot use numbers/underscores in project names - blendMode() and other complex functions fail - Silent failures with blank screen output - Inconsistent error highlighting - Typing lag with large projects (700+ lines) - Example project code disappeared after updates - Dialog boxes appear in German - About and new project buttons invisible in light mode **Most requested features** - Free basic error messages for all users - Undo/redo functionality - Project renaming capability - Project duplication feature - Robust auto-save and backup system - GIF animation support for sprites - Library import and management system - Landscape mode support - Find and replace functionality - Console output for debugging - Settings/preferences menu - File organization with folders - Project thumbnails - Built-in documentation/reference - Processing to p5.js conversion tool - Ability to import entire project folders - Font size customization - Fullscreen mode for screenshots - PVector class support - Pixel density optimization for Retina displays ## Newest reviews (14 of 162) ### 4/5 — Very good but with a flaw *2026-02-21* It works very well but it you play it multiple times, it will always crash which is very annoying. ### 2/5 — I Can’t Add Stuff to My Homepage After I wasted 10$!! *2025-08-24* I bought premium or whatever for 10$ to add little games I made to my home screen like it said I could. When I went to “share to home screen” it wasn’t there! It wouldn’t show “share to Home Screen” like it said it would. I was extremely disappointed and should have seen that it was a scam or something. Although I do love coding in JavaScript! ### 2/5 — Clunky and Faulty *2025-01-22* I have enjoyed writing Processing programs on my computer for about 3 years now. They are a great way for me to keep my skills polished and make things I can easily show others. Imagine my joy at finding out there is a way to do this on mobile! I immediately downloaded the app and even paid for the lifetime Pro features. I am now regretting this purchase. My biggest gripe with the app is just how limited it is. I should have taken it as a sign that ALL of the example projects are only one file long. I have tried to make multi-file projects work, but clearly that feature is just for show. Typing is also HORRENDOUS! Not only does it not auto-indent for you, but typing towards the middle of the file jumps the viewport to the bottom so you can’t even see what you’re typing. Overall, I can see that the projects I want to make will not work in this IDE. After reading reviews that are years old, I can see that the developers have abandoned this hot pile of garbage, and the pro content is not worth a single cent. ### 4/5 — Allow basic debugging for free *2024-09-19* At least allow free users to have basic debugging and make more complex error debugging for pro users. ### 4/5 — But I’m just *2024-08-14* I just wanted a few more ### 2/5 — Ist sein Geld nicht wert. *2024-08-09* Für 9,99 Euro habe ich jetzt ein Jahr lang eine Fehlerhilfe, die mir rät, dass ich die fehlerhafte Zeile auskommentieren soll. Da fühlt man sich etwas ver******. Das Hauptproblem des Programms ist aber, dass man keine "libraries" importieren kann. Zumindest habe ich es 3 Stunden lang vergeblich versucht. Die zwei Sterne gibt es für die schönen Einstiegsbeispiele. Ansonsten ist es wenig nützlich ohne funktionierenden "import". ### 2/5 — A bit disapointed *2024-01-28* This version does not support pixelDensity() nor fullScreen() features... My code was not working, to see faulty code, have to suscribe to pro plan... to see that these features were not supported ... Ne supporte pas la dernière occurrence de processing avec pixelDensity (sur les iPad et iPhone ce serait bien) ni fullScreen() qui éviterait de donner la définition du support. Pour voir les fautes de codes, il faut passer en pro (9,99€) pour comprendre que ce sont les trucs qui m’intéressent qui ne fonctionnent pas. Bref... Décevant et pas de période de test... il n‘y a pas d aide a l écriture (quand tu es en vacances tu n as pas ton dico processing…). Bref c est decevant et c’est un outil qui dev8ent obsolete (pas de mise a jour)… utilisez l ide p5js qui tourne dans un navigateur. ### 2/5 — Bug when using 4 lines using ellipseMode(CORNERS); *2023-10-22* When I use the 4 same sized ellipses after using the ellipse mode for corners, it does not draw the 4the line. Also, when I isolate the 4th line to see if I wrote the code wrong, it prints it from the center at the bottom left of the screen ### 3/5 — Nicht schlecht, aber neuerdings mit blödem Bug *2023-10-12* An sich gut, aber folgender Bug plagt mich neuerdings sehr: 1) Verwende eine Bluetoothtastatur, um zu programmieren. 2) Öffne ein längeres Programm. 3) Setze den Cursor an eine Stelle, an der Du etwas am Programmtext ändern willst (z.B. möchtest Du „if(x>0)“ zu „if(x>0 && x<255)“ erweitern) 4) Tippe den gewünschten Text (hier: „&& x<255“). Bug: Bei JEDEM Tastendruck (also & & < 2 5 5) springt der Editor an eine ganz andere Stelle im Programmtext. Obwohl zwar der Cursor tatsächlich an der Stelle „if(x>0 …)“ bleibt und auch dort die Zeichen & & < 2 5 5 schreibt, sieht man ganz andere Programmtextstellen. Der Editor ist jetzt mit diesem Bug leider unbrauchbar. ### 4/5 — blendmode *2023-09-24* が使えない。 ### 2/5 — DISAPPOINTMENT *2022-12-23, version 2.7* Imagine the least you could do for a Processing app, and you have this app. A huge disappointment. - No local reference (I can open the web reference by myself; it’s NOT THAT MUCH WORK) - No code complete/insight - the console is UNUSABLE for anything more than a single line - Not up to the standard of the current desktop app This is JUNK. PLEASE DO BETTER. ### 3/5 — Good editor, but with a fatal problem *2022-05-29* I love the fact that I can use this editor to work on sketches when I don’t have internet available, but several times I’ve had a situation where I’ve done substantial work on a file and found out later that none of my changes were saved and the file has reverted to an earlier version. ### 4/5 — File management error *2022-05-21, version 2.7* I absolutely love this app. I greatly appreciate coding apps that work without WiFi, and this is the only one I’ve found for Processing. A bug I’ve found, however: I’ll be working on a project, then my phone will fall asleep, I’ll wake it back up, and the changes will be reverted back and I’ll lose up to a few files of work. I’m not sure how or why this happens but I think it’s worth looking into. Secondly, and this is not a bug, just a design thing, the syntax highlighter highlights “bool” in orange - but the keyword is “boolean”. So a line of code will like this: “boolean flag = false;” And “bool” will be orange, while “ean” will be white. ### 4/5 — Programming issue and feedback *2022-03-08* The app takes longer to depict the results/images/graphics after you type in the code, compared to the typing the same thing on PC, however gives enough space for a person using the app to practice different codes ## Most critical reviews (10 lowest-rated) ### 1/5 — Makes you pay to see errors *2025-02-14* This is not reasonable at all. Any good IDE would allow you to see your errors or at least your program logs; it becomes incredibly difficult to program. Making you pay for something like that is **Incredibly** absurd. Do not use this unless you must. ### 1/5 — Adding to Home Screen doesn’t work *2024-10-19* I purchased a lifetime license because the prospect of adding my own sketches to my home screen appealed to me a lot. Turns out it’s just a web shortcut, and it doesn’t even work!! I follow the steps just as instructed but I don’t get the option on safari to add the Home Screen shortcut, so I just wasted my money for nothing. ### 1/5 — i feel ripped off. *2024-09-22* simple things fail silently - just a blank screen. errors that are trapped lead to an in-app purchase screen without even a hint of where the problem is. After you buy the upgrade, it might show where the error is and suggests you comment out the offending line. Useless. This product is scandalously bad and reflects poorly on the real processing software. ### 1/5 — If you don't want heartache, DO NOT DOWNLOAD THIS APP *2024-01-28* It seemingly randomly reverts progress and there is no save option other than to export the script as a file. I will not pay for an app that deletes entire functions and classes that I spent days working with. This seems to happen more often when using multiple .pde tabs, and when switching tabs it often undoes all work done in the previous tab after the new tab was created. Horrible file management and the data loss is not worth it. ### 1/5 — Won’t run .pde files *2023-11-30* If you try to upload pde files and run them, they won’t work. You have to pay $25 to “unlock” compiler output to see what’s wrong. I’d rather make my own app than pay tax to see a compiler output. ### 1/5 — Bonne app portable *2023-02-09* C’est une très bonne application en soi, Malheureusement, une fonction majeure (le débugger) est devenu payant. 30,99€ achat unique 3,49€ mensuel ou 9,99€ par an Impossible d’accéder à l’écran d’achat autrement qu’en laissant une faute volontairement dans son code afin d’avoir le prompt qui demande si vous voulez voir l’erreur. Sinon dans les menu normaux vous avez le choix entre un TIP de 5,99€ (qui n’a aucune influence sur l’application) « recommandé pour les étudiants » 🧐 et un tip de 119,99€ « recommandé pour les entreprises » (toujours aucun effet vis à vis de l’abonnement) Jusqu’ici j’aurais grandement recommandé l’application mais elle a bizarrement été transformée en « moyen alternatif de rémunération » pour les développeurs à base d’abonnements et de dons « recommandés » au vu de comment ont été implémentés les fonctionnalités payantes. Vraiment dommage. ### 1/5 — tip无法使用 *2022-11-25* 购买了tip却无法使用，且无法退款。很难受 ### 1/5 — One of a Kind Experience *2022-11-05* This is the worst experience I’ve seen in my life, excuse my profanity. -4th Year Comp Sci Student ### 1/5 — Keine Brauchbaren Fehlermeldungen *2022-09-11* Trotz Proversion ist es nahezu unmöglich Laufzeitfehlern auf den Grund zu gehen. loadImage und createImage funktionieren nicht, leider wird nicht klar, warum. Schlimmer obwohl durch Typisierung int-Arithmetik gefordert wird intern offenbar mit Gleitkommarithmetik gearbeitet. Schade. ### 1/5 — Does not work *2022-05-02* Some functions work. I could draw an ellipse. But others don’t . I could not draw a square. I paid $9.99 for the subscription to see if that would help, and it did not. Total rip off. They took my money and I still don’t have something that works. ## Most praised reviews (10 highest-rated) ### 5/5 — Please Add GIF *2025-06-30, version 2.7* This is by far the BEST iCompiler not just on apple app store but on the entire internet catering to the iPhone or Mobile device period far as cell phone!!! All it’s missing in my personal opinion is: 1.) GIF for animating sprites! 2.) The Ability to Rename my (p5.js) Projects! 3.) Ability to *Duplicate* a Project! 4.) And a more robust saving system to ensure my miner but tedious code corrections remain secure and doesn’t erase from data over time while I’m unaware (which unfortunately happens more often than what is convenient)! 5.) Oh and an undo / redo button would be absolutely delightful right now!!! 6.) And your conversion to home app (process) doesn’t work well! I’ll even go as far to say if you made all these updates and made a one time lifetime payment to acquire them and make a notice when we log in showing it’s available! I personally would pay for it! Note: A monthly fee would not work because you’d have a lot of angry customers (programmers) who would be unable to compile projects with features they can no longer afford to utilize like GIF etc! I really hope read this message and know that I mean well by it! Congratulations on your hard work and success thus far! Its a slow market but quality is rare to come by and trust me this is the most solid compiler for javascript probably on earth! And mist wont realize how much they need this until they have lol!!! And like why hasn’t Someone been created this! Try to hurry up and get those updates before the A.I. wave comes by! Everyone is looking to test their codes more on their phones! And all you need is one good wave and one good shout out and BOOM! Literally, Foot on the gas for life! It’s just like that! Peace & Blessings. ### 5/5 — Best App for p5js .... *2024-08-11* This is the best app by far for p5js scripts especially for ipad . Keep up the good work.. ### 5/5 — I hope that development gets going again *2024-04-06* It's a shame that this great app hasn't been developed for some time. I also bought the annual subscription to support the developers, but I have now canceled it for the time being. A modern file system is really needed. It should be possible to load and edit files directly from the cloud or from "Files". A rename function would be great. Some functions are not supported, but the app is really good for sketching on the go. I hope that development gets going again. Thank you! ### 5/5 — вдлвовльвлвьвллвтвлвтвлвшсоаоалв *2024-02-05, version 2.7* первый Российский комментарий ### 5/5 — Did they get the call *2023-06-28* Very nice and good luck ### 5/5 — It works :D *2023-03-03* I was able to copy paste the little game I made using my school computers Processing onto my iPad. Now I can show my family the progress I’ve made! ### 5/5 — Absolutely terrific *2021-07-09* This is a great app for quick cool processing and p5 sketches, i have a bunch of sketches on my phone, probably more than i have anywhere else, super great app i recommend it wholeheartedly! ### 5/5 — Super ich liebs *2021-03-22* Top ### 5/5 — Excellent *2021-03-05* I’ve used this for a few Processing sketches with p5js on my iPad Pro (with keyboard folio) and it works really well. My 3yo daughter loves watching and playing with some of the examples and code I’ve written too. Exporting of projects just got added too, so I can shuffle off my code to my desktop for finishing off. ### 5/5 — Please, could you add themes to choose? *2021-03-04* Hello! Thank you very much for this great app, I love it! Could you add some more code themes to choose, please? --- *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 2026-08-27.*