# Perturbation > Simple task completion tracker with data management features. (iPhone/iPad app by Hassan Usman.) - Source: https://appshunter.io/ios/app/perturbation/id6478964353 (this page in markdown: same URL + `.md`) - Developer: [Hassan Usman](https://appshunter.io/developer/1733858468) - Category: Reference, Utilities - Price: Free - Rating: 4.53/5 from 176 App Store ratings · 37 written reviews indexed - Age rating: 17+ - Requires: iOS 12.4 · 81 MB - Languages: English - Released: 2024-03-06 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/perturbation/id6478964353/reviews.md ## What is Perturbation? Mark each task you complete. This application is very easy to use and I hope you like it. This gives you options to delete and mark saved data. ## Key features - Mark tasks as complete - Delete saved data - Mark saved data - Easy to use interface ## Recent user reviews (10 of 37) All indexed reviews: https://appshunter.io/ios/app/perturbation/id6478964353/reviews.md ### 2/5 — Could use some changes *2024-07-13* If you close the app without saving the note it deletes. And the time frame for it to save is 5 minutes which could be improved. ### 5/5 — Annoying ads *2024-07-10* Other then the annoying ads this is a good app ### 5/5 — (costs $20 a month) BEST NOTE APP EVER!! *2024-07-01* (costs $20 a month) a range of people have said they don’t like it because they don’t know how to use it but let me tell you, it’s so easy to organize and practice all your notes everyday and it’s skill programmed into the app to help you throughout the day is INCREDIBLE!! i have never missed an assignment after downloading this app😊 ### 5/5 — 🤩🤩🤩 *2024-07-01* It's the best app I've ever tried in my life that may be a little annoying because of the ads but I'm used to it and also trust me that it has all the animes you might be thinking about. Also, if you are looking for an anime or did not find it, it may be your mistake because you did not write the name of the anime or the movie correctly, and you must write the name of the anime or the movie and not the characters in them. ### 4/5 — Rating *2024-06-30* App is amazing but the only problem is the ads. I should not have an add everytime i swipe out of the series. When I logged in, it doesnt require me to watch adds to watch the series but when Im not watching anything in general i see multiple ads on the app. Its obnoxious. I like to research things while watching series, so when i come back to the app i dont want to see an ad. ### 5/5 — why *2024-06-30* Why do I have to watch ads every time I finish watching or start an episode 😒 ### 5/5 — Ads *2024-06-29* Its goods its really just the ads that gets me. once I finish one note and try to make another I have to watch a ad and each ad is like 1 minute or less and than sometimes when you already watched a ad another 1 minute ad will occur so that’s frustrating. But other than the ads its so good I love writing down my schedule down ! ### 5/5 — soo amazingg! *2024-06-29* This app helps me get what needs to be done, done with no distractions!! It really changes things up in your life, I recommend! 😉 ### 5/5 — GREAT app *2024-06-26* it helps be keep up w my to do’s, keeps me organized and well timed all day ### 5/5 — WONDERFUL APP *2024-06-26* 10/10 baby ive never been so organized in my life, i finish all my task on time and ive notice because of this list im left with more personal time . ## Frequently asked questions about Perturbation ### What does this app do? This application is designed to help you mark and track your completed tasks. It provides a simple interface for managing your progress and saved data. ### What are the main features? Key features include the ability to mark tasks as complete, delete saved data, and mark saved data. The app is designed for ease of use. ### Is this app free to use? Yes, the application is free to use. There are no mentioned costs or in-app purchases associated with its functionality. ### Who is this app for? This app is ideal for anyone who needs a straightforward tool to keep track of their completed tasks without complex features. ## Version history (last 2 releases) ### 2.0 — 2024-03-15 1. The application supports iPad use 2. Fix some problems and optimize the user experience ### 1.0 — 2024-03-06 No release notes. --- *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 2026-06-10.*