# iDictionary vs Formula Motion

The clearest difference is in-app purchases: Formula Motion at none against iDictionary's 1. On price, update cadence, ads and device support there is nothing between them.

iDictionary costs $0.99 and Formula Motion $0.99 up front. iDictionary sells 1 one-off in-app purchase. Formula Motion asks for nothing beyond the download.

iDictionary ships an update every 6 weeks, Formula Motion monthly. The most recent releases landed on November 6, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | iDictionary | Formula Motion |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | — | Paid |
| Size | 80 MB | 40 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [天从 何](https://appshunter.io/developer/914453386) | [锐 冯](https://appshunter.io/developer/1896254031) |

## What reviewers say

### iDictionary

[App page](https://appshunter.io/ios/app/idictionary-chinese-dict/id1459028775)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reward developers | $0.99 | one-time |


### Formula Motion

[App page](https://appshunter.io/ios/app/formula-motion/id6769649267)

This app transforms abstract mathematical concepts into engaging visual animations. It helps users understand formulas, theorems, and patterns through step-by-step explanations and diagrams. Ideal for both quick learning on the go and deeper exploration on larger screens.

**Highlights:** Animated math formulas, Geometry theorem visualizations, Number pattern animations, Step-by-step explanations, Diagram-based reasoning, Key takeaways for math concepts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iDictionary free?

iDictionary costs $0.99, and also offers in-app purchases.

### Is Formula Motion free?

Formula Motion costs $0.99, with no in-app purchases.

### Do iDictionary or Formula Motion have ads?

Neither iDictionary nor Formula Motion shows ads.

### Which is updated more often, iDictionary or Formula Motion?

iDictionary ships an update every 6 weeks, and Formula Motion monthly. Most recently, iDictionary was updated on November 6, 2026 and Formula Motion on November 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.*