# QuantQwik vs 66 Days

The clearest difference is in-app purchases: QuantQwik at none against 66 Days's 2. 66 Days's advantage is rating (4.9 vs 4.5) and ratings volume (228 vs 6). On price, ads, monetization model 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. QuantQwik asks for nothing beyond the download.

66 Days holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: 66 Days has 228 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 33% of QuantQwik's written reviews are positive against 50% of 66 Days's.

QuantQwik ships an update monthly, 66 Days every 10 days. The most recent releases landed on October 3, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | QuantQwik | 66 Days |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (6 ratings)](https://appshunter.io/ios/app/quantqwik/id6752131119/reviews) | **[4.9 (228 ratings)](https://appshunter.io/ios/app/66-days-ai-interview-prep/id6752681422/reviews)** |
| Number of ratings | 6 | **228** |
| Positive reviews | 33.3% of reviews | **50.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | Freemium | Freemium |
| Size | 7 MB | 110 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shubham Tiwari](https://appshunter.io/developer/1832444203) | [Uru Technologies, LLC](https://appshunter.io/developer/1840551197) |

## What reviewers say

### QuantQwik

[App page](https://appshunter.io/ios/app/quantqwik/id6752131119)

This app offers cognitive training and mental math drills specifically designed for quantitative finance candidates. It simulates the pressure and structure of real interview assessments, focusing on speed, precision, and decision-making skills.

**Highlights:** Cognitive, mental math, and problem-solving assessments, Simulates interview timing and pressure, Fast arithmetic drills, Attention and cognitive control tasks, Memory and spatial reasoning challenges, Risk-assessment mini games

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is QuantQwik free?

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

### Is 66 Days free?

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

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

66 Days is rated higher. QuantQwik averages 4.5 out of 5 from 6 ratings, while 66 Days averages 4.9 from 228 ratings.

### Do QuantQwik or 66 Days have ads?

Neither QuantQwik nor 66 Days shows ads.

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

QuantQwik ships an update monthly, and 66 Days every 10 days. Most recently, QuantQwik was updated on October 3, 2026 and 66 Days on October 7, 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.*