# 66 Days vs Trading Interview Math Trainer

The clearest difference is in-app purchases: Trading Interview Math Trainer at none against 66 Days's 2. Trading Interview Math Trainer also leads on iOS requirement (15.1 vs 17.0). 66 Days's advantage is update cadence (every 10 days vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. 66 Days sells 2 in-app purchases, starting at $15.99 per month. Trading Interview Math Trainer asks for nothing beyond the download.

66 Days ships an update every 10 days, Trading Interview Math Trainer every 5 months. The most recent releases landed on October 23, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | 66 Days | Trading Interview Math Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (258 ratings)](https://appshunter.io/ios/app/66-days-ai-interview-prep/id6752681422/reviews)** | — |
| Number of ratings | **258** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 5 months |
| Monetization | Freemium | — |
| Size | 110 MB | 33 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Uru Technologies, LLC](https://appshunter.io/developer/1840551197) | [Trading Interview B.V.](https://appshunter.io/developer/1856959369) |

## 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 |


### Trading Interview Math Trainer

[App page](https://appshunter.io/ios/app/trading-interview-math-trainer/id6755886895)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 66 Days free?

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

### Is Trading Interview Math Trainer free?

Trading Interview Math Trainer is free to download, with no in-app purchases.

### Do 66 Days or Trading Interview Math Trainer have ads?

Neither 66 Days nor Trading Interview Math Trainer shows ads.

### Which is updated more often, 66 Days or Trading Interview Math Trainer?

66 Days ships an update every 10 days, and Trading Interview Math Trainer every 5 months. Most recently, 66 Days was updated on October 23, 2026 and Trading Interview Math Trainer on September 18, 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.*