# HappyKey vs Truly Simple Flashcards

The clearest difference is in-app purchases: HappyKey at none against Truly Simple Flashcards's 1. Truly Simple Flashcards's advantage is update cadence (every 6 weeks vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Truly Simple Flashcards sells 1 one-off in-app purchase. HappyKey asks for nothing beyond the download.

HappyKey ships an update every 8 months, Truly Simple Flashcards every 6 weeks. The most recent releases landed on October 10, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | HappyKey | Truly Simple Flashcards |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (9 ratings)](https://appshunter.io/ios/app/happykey/id965705471/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 26 MB | 2 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Baratti](https://appshunter.io/developer/1264988386) | [Colin Wright](https://appshunter.io/developer/1814828139) |

## What reviewers say

### HappyKey

[App page](https://appshunter.io/ios/app/happykey/id965705471)

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.

**Highlights:** Specialized math symbol keyboard, Includes numbers and operators, Supports pi and infinity symbols, Simplifies math notation input, Customizable keyboard layout

**In-app purchases:** none


### Truly Simple Flashcards

[App page](https://appshunter.io/ios/app/truly-simple-flashcards/id6783021916)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $4.99 | one-time |


## Frequently asked questions

### Is HappyKey free?

HappyKey is free to download, with no in-app purchases.

### Is Truly Simple Flashcards free?

Truly Simple Flashcards is free to download, with in-app purchases available.

### Do HappyKey or Truly Simple Flashcards have ads?

Neither HappyKey nor Truly Simple Flashcards shows ads.

### Which is updated more often, HappyKey or Truly Simple Flashcards?

HappyKey ships an update every 8 months, and Truly Simple Flashcards every 6 weeks. Most recently, HappyKey was updated on October 10, 2026 and Truly Simple Flashcards on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*