# HappyKey — Math notation made easy! > A custom keyboard for typing mathematical symbols and notation. (iPhone/iPad app by Alex Baratti.) - Source: https://appshunter.io/ios/app/happykey/id965705471 (this page in markdown: same URL + `.md`) - Developer: [Alex Baratti](https://appshunter.io/developer/1264988386) - Category: Education, Utilities - Price: Free - Rating: 3.67/5 from 9 App Store ratings · 12 written reviews indexed - Age rating: 4+ - Requires: iOS 16.6 · 5 MB - Languages: English - Released: 2015-03-01 - Data updated: 2026-06-11 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/happykey/id965705471/reviews.md ## What is HappyKey? HappyKey provides you with a simple keyboard with many useful math symbols. It will fulfill all of your math notation needs with numbers, superscripts, pi, math operators and relations, infinity, and beyond. Install the app first, then to setup the keyboard go to Settings > General > Keyboard > Keyboards > Add New Keyboard > HappyKey Note: This is not a calculator. This is an additional keyboard that makes it easier to type math notation. Credit for the keyboard functionality and design goes to the open source Tasty Imitation Keyboard by Alexei Baboulevitch (GitHub user archagon). ## Key features - Specialized math symbol keyboard - Includes numbers and operators - Supports pi and infinity symbols - Simplifies math notation input - Customizable keyboard layout ## Recent user reviews (10 of 12) All indexed reviews: https://appshunter.io/ios/app/happykey/id965705471/reviews.md ### 5/5 — Useful *2026-01-08, version 5.0* Convenient, no issues ### 4/5 — Where is it *2025-12-29* I can’t find it the letters THE LETTERS but love the app though! ### 5/5 — Free and Great *2024-04-11* I was scouting the internet for hours looking for a free keyboard that uses math notation and couldn’t find any that weren’t a few dollars, a subscription service or upwards of $24!!! This app is free and works perfectly! I wish there were differentials and integral symbols but I digress this is an amazing keyboard that adds super- and subscript functionality FOR FREE! Along with a few nifty math terms! I love it! ### 1/5 — Can’t seem to do anything *2019-06-19* When I launch the app, all I see is the teal blue screen with the smiley face on it. It won’t do anything. Otherwise, the app looks very helpful. ### 3/5 — The tiny numbers are where? *2019-05-30* On the App Store, the second screen shows much smaller numbers that I assumed would be superscript or subscript numbers. But on my phone it’s all large numbers, with the clunky way of using the ^ symbol to make a superscript that still is just a large size number. **Developer response:** Hello, To access the superscript or subscript numbers, tap and hold on the full-sized number on the first screen. You should see a pop out that shows the number with superscript and subscript options. Release your finger over whichever option you want to type. Thank you for your feedback and for using HappyKey! ### 3/5 — Great app. I find it very useful *2018-04-02, version 4.0* I know it’s not mathematical. However can you enable the power of 1 symbol. eg a^1. I’m not using this for mathematical notations and I have every number except 1. It’s there, it pops up I just cannot select it for use. Thanks ### 4/5 — Where is it *2018-03-12* Either I can’t find it or it isn’t there but I wish there was a division symbol **Developer response:** Hello, The division symbol is accessible by holding down on the / key and releasing on the ÷ key. Thanks for using HappyKey! ### 3/5 — Has potential *2016-12-10* This app has potential to be a great resource for students in school to support math recording. However, the multiplication symbol need to be a "X" rather than a dot. With this simple adjustment, it could be a very valuable tool for students to record math on the iPad. ### 2/5 — No times symbol *2016-07-09* This app doesn't have the X like multiplication symbol. I needed that. ### 2/5 — No multiplication symbol *2016-03-23* I got this keyboard because I really needed a multiplication symbol, but it is not included. Otherwise, it looks nice. Unfortunately, it does not do what I need. ## Frequently asked questions about HappyKey ### How do I set up HappyKey? To set up HappyKey, first install the app. Then, go to your device's Settings > General > Keyboard > Keyboards > Add New Keyboard and select HappyKey. This will add the custom keyboard to your device. ### Is HappyKey a calculator? No, HappyKey is not a calculator. It functions as an additional keyboard that makes it easier to type mathematical notation and symbols, rather than performing calculations. ### What kind of math symbols does HappyKey offer? HappyKey provides a variety of math symbols, including numbers, superscripts, pi, common math operators and relations, and the infinity symbol, among others. ### What devices does HappyKey support? HappyKey is supported on iPhone and iPad devices, running on iOS. ### How often is HappyKey updated? The latest version of HappyKey is 5.0, last updated on March 14, 2025. This indicates a history of updates, suggesting ongoing development and support. ### What is the age rating for HappyKey? HappyKey has an age rating of 4+, making it suitable for a wide range of users, including younger students. ### Does HappyKey have ads? No, HappyKey does not contain advertisements. The app is free to use without any ad interruptions. ### What is the user sentiment for HappyKey based on ratings? HappyKey has an average rating of 3.6 stars from 8 ratings. This suggests a generally positive but mixed user reception. ## Version history (last 5 releases) ### 5.1 — 2026-04-19 Liquid Glass Onboarding now uses Liquid Glass elements in iOS 26. Minor Fixes HappyKey has been optimized for iOS 26. ### 5.0 — 2025-03-14 New Guided Setup Experience A much improved user interface that guides new users through enabling the keyboard and how to use it Dark Mode Icons (iOS 18 Required) HappyKey's icon has been updated to have dark and tinted variants to match the rest of your App Library ### 4.0.2 — 2019-06-17 iPad Pro (3rd Generation) optimized iOS 12 optimized ### 4.0.1 — 2018-10-29 Minor bug fixes New in 4.0 Rebuilt from the ground up! New icon and user interface The long awaited multiplication sign (×) is finally here! Just long press on the multiplication dot (•) to select it. ### 4.0 — 2018-03-11 Rebuilt from the ground up! New icon and user interface The long awaited multiplication sign (×) is finally here! Just long press on the multiplication dot (•) to select it. ## Apps similar to HappyKey | App | Rating | Price | Category | | --- | --- | --- | --- | | [Crown Variety Cash Register](https://appshunter.io/ios/app/crown-variety-cash-register/id1606306781) | — | Free | Education | | [Civil Dictionary Offline](https://appshunter.io/ios/app/civil-dictionary-offline/id1480363022) | 4.0 (2) | Free | Education | | [Japanese Conjugation](https://appshunter.io/ios/app/japanese-conjugation/id1584792254) | 4.6 (30) | Free | Education | | [AP Physics Guided Sims](https://appshunter.io/ios/app/ap-physics-guided-sims/id1605724478) | 5.0 (1) | Free | Education | | [Real Solar System](https://appshunter.io/ios/app/real-solar-system/id6475644962) | — | Free | Education | | [CloudLabs Acid-Base Enthalpy](https://appshunter.io/ios/app/cloudlabs-acid-base-enthalpy/id1596470901) | — | Free | Education | ## More apps by Alex Baratti - [Cardiac King](https://appshunter.io/ios/app/cardiac-king/id6742724166) All apps by Alex Baratti: https://appshunter.io/developer/1264988386 --- *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 2026-06-11.*