# 66 Days vs Variance

66 Days and Variance both sit at 4.9 stars, but that hides the real split: 100% of Variance's written reviews are positive against 50% of 66 Days's. 66 Days's advantage is ratings volume (228 vs 5) and iOS requirement (17.0 vs 26.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. 66 Days sells 2 in-app purchases, starting at $15.99 per month and Variance sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.9 for 66 Days against 5.0 for Variance. That said, the two scores are not equally well evidenced: 66 Days has 228 ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 50% of 66 Days's written reviews are positive against 100% of Variance's.

66 Days ships an update every 10 days, Variance every 2 weeks. The most recent releases landed on October 7, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | 66 Days | Variance |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (228 ratings)](https://appshunter.io/ios/app/66-days-ai-interview-prep/id6752681422/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/variance-the-quant-prep-app/id6760629839/reviews)** |
| Number of ratings | **228** | 5 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Monetization | Freemium | Freemium |
| Size | 110 MB | 18 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Uru Technologies, LLC](https://appshunter.io/developer/1840551197) | [Benjamin Kawano](https://appshunter.io/developer/1885410913) |

## 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 |


### Variance

[App page](https://appshunter.io/ios/app/variance-the-quant-prep-app/id6760629839)

Prepare for quantitative finance interviews with this app. Practice probability, mental math, logic puzzles, and more with detailed solutions and progress tracking. Sharpen your mathematical intuition and problem-solving skills for trading and research roles.

**Highlights:** Probability practice, Mental math exercises, Logic puzzles, Detailed solutions, Progress tracking, Topic-specific practice

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Variance Pro Monthly | $9.99 | per month |
| Variance Pro 6-Month | $49.99 | per 6 months |
| Variance Pro Yearly | $99.99 | per year |


## Frequently asked questions

### Is 66 Days free?

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

### Is Variance free?

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

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

Variance is rated higher. 66 Days averages 4.9 out of 5 from 228 ratings, while Variance averages 5.0 from 5 ratings.

### Do 66 Days or Variance have ads?

Neither 66 Days nor Variance shows ads.

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

66 Days ships an update every 10 days, and Variance every 2 weeks. Most recently, 66 Days was updated on October 7, 2026 and Variance on October 15, 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.*