4Dice vs HappyKey
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
4Dice
Explore a hypercube visualized as a 4-dimensional, 8-sided die. Interact with the die using multitouch controls to reveal its hidden faces as they come into view during rolls. Experience a unique perspective on geometric visualization.
- Multitouch controls
- 4D hypercube exploration
- Interactive die rolling
- Geometric visualization
- Unique perspective rendering
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This application exploits multitouch controls to explore a hypercube labeled as a 4-dimensional, 8-sided die. The hypercube's eight cube-shaped faces are rendered as a 4D being would see them in 4D light: thus, only one, two, three, or four cubic faces can appear at one time while the die rolls, but no more. Faces that would be invisible to a 4D gambler cannot be seen without interactively rolling the die to bring them into view.
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).
Screenshots
Verdict
The clearest difference is review sentiment: 4Dice at 100% against HappyKey's 50%. 4Dice also leads on rating (4.8 vs 3.7) and iOS requirement (9.3 vs 17.6). HappyKey's advantage is update cadence (every 8 months vs every 18 months). On price, ratings volume, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
4Dice holds the better App Store score, 4.8 against 3.7. Both are backed by a comparable volume of ratings — 4 and 9 respectively. Written reviews point the same way: 100% of 4Dice's written reviews are positive against 50% of HappyKey's.
4Dice ships an update every 18 months, HappyKey every 8 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.
| Parameter | 4Dice | HappyKey |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4 ratings) — better | 3.7 (9 ratings) |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 4 | 9 — better |
| Update frequency | Every 18 months | Every 8 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.3 — better | 17.6 |
| Further details — not scored | ||
| Size | 15 MB | 26 MB |
| Age rating | 12+ | 4+ |
| Developer | Andrew Hanson | Alexander Baratti |
Customer experience
4Dice
HappyKey
In-app purchases
4Dice
No in-app purchases
HappyKey
No in-app purchases
