# 66 Days vs Smart CDL

The clearest difference is ratings volume: 66 Days at 258 against Smart CDL's 1. Smart CDL's advantage is update cadence (every 5 days vs every 10 days) and iOS requirement (15.0 vs 17.0). 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 Smart CDL sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Smart CDL 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 1, so its average is the more settled of the two.

66 Days ships an update every 10 days, Smart CDL every 5 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 66 Days | Smart CDL |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (258 ratings)](https://appshunter.io/ios/app/66-days-ai-interview-prep/id6752681422/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/smart-cdl/id6809233186/reviews)** |
| Number of ratings | **258** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 5 days** |
| Monetization | Freemium | — |
| Size | 110 MB | 38 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Uru Technologies, LLC](https://appshunter.io/developer/1840551197) | [ALIAKSEI HRECHKA](https://appshunter.io/developer/6809233188) |

## 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 |


### Smart CDL

[App page](https://appshunter.io/ios/app/smart-cdl/id6809233186)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Combination Vehicles | $9.99 | one-time |
| Doubles and Triples | $9.99 | one-time |
| Hazardous Materials | $9.99 | one-time |
| Passengers | $9.99 | one-time |
| School Bus | $9.99 | one-time |
| Tank Vehicles | $9.99 | one-time |
| Upgrade | $9.99 | one-time |
| Upgrade | $19.99 | one-time |
| Upgrade | $29.99 | one-time |
| Upgrade | $39.99 | one-time |


## Frequently asked questions

### Is 66 Days free?

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

### Is Smart CDL free?

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

### Which has better reviews, 66 Days or Smart CDL?

Smart CDL is rated higher. 66 Days averages 4.8 out of 5 from 258 ratings, while Smart CDL averages 5.0 from 1 ratings.

### Do 66 Days or Smart CDL have ads?

Neither 66 Days nor Smart CDL shows ads.

### Which is updated more often, 66 Days or Smart CDL?

66 Days ships an update every 10 days, and Smart CDL every 5 days. Most recently, 66 Days was updated on October 23, 2026 and Smart CDL on October 24, 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.*