HappyKey vs ArithmeType
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HappyKey
This app offers a specialized keyboard for easily inputting a wide range of mathematical symbols. It includes numbers, operators, pi, infinity, and more, simplifying the process of writing math notation on your device.
- Specialized math symbol keyboard
- Includes numbers and operators
- Supports pi and infinity symbols
- Simplifies math notation input
- Customizable keyboard layout
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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).
ArithmeType
This app provides a specialized keyboard for easily typing mathematical expressions. It simplifies access to symbols from arithmetic to calculus, with features for early learners and accessibility support. It works across various websites and apps.
- Simplified math typing
- Easy symbol access
- Works with any app
- Accessibility support (VoiceOver, Switch Access, Eye Gaze)
- Removable section covers for learners
- Covers arithmetic through calculus
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Simplified math typing with no complicated searching for characters. Popups keep users oriented on the home screen, thereby avoiding confusing screen changes. Symbols covers arithmetic through calculus. Compatible with any website or app that allows screen changes. The keyboard is accessible with VoiceOver, Switch Access, and Eye Gaze. Early learners can benefit from removable section covers, keeping attention on relevant math symbols.
Screenshots
Verdict
The clearest difference is price: HappyKey at Free against ArithmeType's $9.99. HappyKey also leads on rating (3.7 vs 3.5) and review sentiment (50% vs 40%). ArithmeType's advantage is update cadence (every 5 weeks vs every 8 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
HappyKey is free to download; ArithmeType costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
HappyKey holds the better App Store score, 3.7 against 3.5. Both are backed by a comparable volume of ratings — 9 and 4 respectively. Written reviews point the same way: 50% of HappyKey's written reviews are positive against 40% of ArithmeType's.
HappyKey ships an update every 8 months, ArithmeType every 5 weeks. The most recent releases landed on September 24, 2026 and September 21, 2026 respectively.
| Parameter | HappyKey | ArithmeType |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 3.7 (9 ratings) — better | 3.5 (4 ratings) |
| Positive reviews | 50.0% of reviews — better | 40.0% of reviews |
| Number of ratings | 9 — better | 4 |
| Update frequency | Every 8 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 26 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Alexander Baratti | ArithmeType LLC |
Customer experience
HappyKey
ArithmeType
In-app purchases
HappyKey
No in-app purchases
ArithmeType
No in-app purchases
