# Decision Muscle vs String Theory!

The clearest difference is ads: Decision Muscle at none against String Theory!'s shown. On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Decision Muscle sells 2 in-app purchases, starting at $9.99 per month and String Theory! sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Decision Muscle | String Theory! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (1 ratings)](https://appshunter.io/ios/app/string-theory/id6757779491/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 days | — |
| Monetization | — | Free with in-app purchases |
| Size | 86 MB | 56 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Decision Muscle LTD](https://appshunter.io/developer/1861438815) | [Synthify Inc](https://appshunter.io/developer/1089257745) |

## What reviewers say

### Decision Muscle

[App page](https://appshunter.io/ios/app/decision-muscle-overthinking/id6756568279)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $9.99 | per month |
| Yearly | $59.99 | per year |


### String Theory!

[App page](https://appshunter.io/ios/app/string-theory/id6757779491)

This app provides a digital space to visually organize ideas, clues, and connections. Create interactive boards with photos, notes, and images, then link them with strings to uncover patterns. It's designed to help users map out complex information for various creative and analytical tasks.

**Highlights:** Unlimited detective boards, Add photos, images, and notes, Pin items freely, Connect clues with strings, Organize with tags, Distraction-free design

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Yearly | $24.99 | per year |
| One Time | $29.99 | one-time |


## Frequently asked questions

### Is Decision Muscle free?

Decision Muscle is free to download, with in-app purchases available.

### Is String Theory! free?

String Theory! is free to download, with in-app purchases available.

### Do Decision Muscle or String Theory! have ads?

String Theory! shows ads; Decision Muscle does not.

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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.*