# Size Guesser vs Fermi

The clearest difference is ads: Fermi at none against Size Guesser's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Size Guesser sells 1 one-off in-app purchase and Fermi sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Size Guesser ships an update weekly, Fermi every 4 days. The most recent releases landed on November 3, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Size Guesser | Fermi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/size-guesser-compare-objects/id6810711526/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 108 MB | 13 MB |
| Requires iOS | 18.6 | **18.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [EMIRHAN KASAL](https://appshunter.io/developer/1836752963) | [AppFusion Labs](https://appshunter.io/developer/1896597393) |

## What reviewers say

### Size Guesser

[App page](https://appshunter.io/ios/app/size-guesser-compare-objects/id6810711526)

Test your perception of scale by resizing objects to match their real-world dimensions. Compete with friends or play solo across diverse themed categories. Earn points and unlock achievements as you master the art of size comparison.

**Highlights:** 12 themed categories, Over 1,000 objects, Online 1v1 multiplayer, Party Mode for up to 8 players, Achievements and stats, 27 language support, Dark mode

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Upgrade | $2.99 | one-time |


### Fermi

[App page](https://appshunter.io/ios/app/fermi-daily-estimation-quiz/id6820531955)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fermi Pro · aylık | $0.99 | per month |
| Fermi Pro · yıllık | $7.99 | per year |


## Frequently asked questions

### Is Size Guesser free?

Size Guesser is free to download, with in-app purchases available.

### Is Fermi free?

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

### Do Size Guesser or Fermi have ads?

Size Guesser shows ads; Fermi does not.

### Which is updated more often, Size Guesser or Fermi?

Size Guesser ships an update weekly, and Fermi every 4 days. Most recently, Size Guesser was updated on November 3, 2026 and Fermi on October 29, 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.*