# Mental Chronometry vs The Spy

The clearest difference is update cadence: The Spy at every 4 weeks against Mental Chronometry's every 42 months. Mental Chronometry's advantage is iOS requirement (15.6 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Mental Chronometry costs $0.99 and The Spy $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Mental Chronometry ships an update every 42 months, The Spy every 4 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | Mental Chronometry | The Spy |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 42 months | **Every 4 weeks** |
| Size | 201 MB | 4 MB |
| Requires iOS | **15.6** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Paul Cohen](https://appshunter.io/developer/908777603) | [Julian Schumacher](https://appshunter.io/developer/1681063160) |

## What reviewers say

### Mental Chronometry

[App page](https://appshunter.io/ios/app/mental-chronometry/id1574095844)

**Features:** macOS Compatibility

**In-app purchases:** none


### The Spy

[App page](https://appshunter.io/ios/app/the-spy-mobile-game/id6502282465)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Chronometry free?

Mental Chronometry costs $0.99, with no in-app purchases.

### Is The Spy free?

The Spy costs $0.99, with no in-app purchases.

### Do Mental Chronometry or The Spy have ads?

Neither Mental Chronometry nor The Spy shows ads.

### Which is updated more often, Mental Chronometry or The Spy?

Mental Chronometry ships an update every 42 months, and The Spy every 4 weeks. Most recently, Mental Chronometry was updated on October 25, 2026 and The Spy on October 25, 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.*