# Fermi vs CaseXcel

The clearest difference is in-app purchases: Fermi at none against CaseXcel's 4. Fermi also leads on iOS requirement (13.0 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. CaseXcel sells 4 in-app purchases, starting at $9.99 per month. Fermi asks for nothing beyond the download.

Fermi ships an update every 2 weeks, CaseXcel every 11 days. Both last shipped on September 30, 2026.

## The numbers

| Metric | Fermi | CaseXcel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/casexcel-case-interview-prep/id6748584932/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 11 days** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 61 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hui Jin](https://appshunter.io/developer/1594777897) | [ANIELLO DI POLITO](https://appshunter.io/developer/1822838772) |

## What reviewers say

### Fermi

[App page](https://appshunter.io/ios/app/fermi/id1662149326)

**In-app purchases:** none


### CaseXcel

[App page](https://appshunter.io/ios/app/casexcel-case-interview-prep/id6748584932)

Practice essential consulting interview skills daily in under 10 minutes. Improve mental math, market sizing, structuring, and framework recall with structured, timed drills. Access a reference library of frameworks without fluff.

**Highlights:** Daily mental math drills, Timed case math calculations, Market sizing estimation practice, MECE structuring drills, Framework recall flashcards, Reference library of frameworks

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CaseXcel Premium | $9.99 | per month |
| CaseXcel Annual (Best Value!) | $39.99 | per year |
| CaseXcel Pro Lifetime | $59.99 | one-time |
| CaseXcel Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is Fermi free?

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

### Is CaseXcel free?

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

### Do Fermi or CaseXcel have ads?

Neither Fermi nor CaseXcel shows ads.

### Which is updated more often, Fermi or CaseXcel?

Fermi ships an update every 2 weeks, and CaseXcel every 11 days. Most recently, Fermi was updated on September 30, 2026 and CaseXcel on September 30, 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.*