# 66 Days vs FiveMinuteFox

66 Days and FiveMinuteFox both sit at 4.8 stars, but that hides the real split: 100% of FiveMinuteFox's written reviews are positive against 50% of 66 Days's. 66 Days's advantage is update cadence (every 10 days vs every 3 months) and ratings volume (258 vs 3). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. 66 Days sells 2 in-app purchases, starting at $15.99 per month and FiveMinuteFox sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

FiveMinuteFox holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: 66 Days has 258 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 50% of 66 Days's written reviews are positive against 100% of FiveMinuteFox's.

66 Days ships an update every 10 days, FiveMinuteFox every 3 months. The most recent releases landed on October 23, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | 66 Days | FiveMinuteFox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (258 ratings)](https://appshunter.io/ios/app/66-days-ai-interview-prep/id6752681422/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/fiveminutefox-mental-math/id6758168199/reviews)** |
| Number of ratings | **258** | 3 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 months |
| Monetization | Freemium | Freemium |
| Size | 110 MB | 4 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Uru Technologies, LLC](https://appshunter.io/developer/1840551197) | [KeepAddIt Works, LLC](https://appshunter.io/developer/1847586744) |

## What reviewers say

### 66 Days

[App page](https://appshunter.io/ios/app/66-days-ai-interview-prep/id6752681422)

Master banking and consulting interviews with daily AI-powered practice. Track your progress on a 66-day journey with personalized feedback on technical, behavioral, and case questions. Improve your resume and gain confidence for top firms.

**Highlights:** AI interview coach with personalized feedback, Daily drills for behavioral, technical, and case questions, 66-day progress heat map, Resume checker, Excel and valuation tools, Analytics dashboard

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 66 Days Prep Pro | $15.99 | per month |
| 66 Days Prep Pro | $49.99 | per year |


### FiveMinuteFox

[App page](https://appshunter.io/ios/app/fiveminutefox-mental-math/id6758168199)

Enhance your financial acumen with daily mental math exercises. Designed by a finance professional, this app offers progressive levels of practice to improve your calculation speed and accuracy for business contexts. Unlock advanced levels and features with a premium subscription.

**Highlights:** Daily mental math practice, 30 progressive difficulty levels, Specialized business context problems, Detailed solution explanations, Practice Mode for targeted skills, Streak tracking

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FiveMinuteFox Premium | $4.99 | per month |
| FiveMinuteFox Premium | $29.99 | per year |


## Frequently asked questions

### Is 66 Days free?

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

### Is FiveMinuteFox free?

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

### Which has better reviews, 66 Days or FiveMinuteFox?

FiveMinuteFox is rated higher. 66 Days averages 4.8 out of 5 from 258 ratings, while FiveMinuteFox averages 5.0 from 3 ratings.

### Do 66 Days or FiveMinuteFox have ads?

Neither 66 Days nor FiveMinuteFox shows ads.

### Which is updated more often, 66 Days or FiveMinuteFox?

66 Days ships an update every 10 days, and FiveMinuteFox every 3 months. Most recently, 66 Days was updated on October 23, 2026 and FiveMinuteFox on October 22, 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.*