# Sci vs 66 Days

The clearest difference is in-app purchases: Sci at none against 66 Days's 2. Sci also leads on update cadence (every 2 days vs every 10 days) and iOS requirement (15.1 vs 17.0). 66 Days's advantage is ratings volume (260 vs 2). On price, rating, 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. Sci asks for nothing beyond the download.

Sci holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: 66 Days has 260 ratings behind it against 2, so its average is the more settled of the two.

Sci ships an update every 2 days, 66 Days every 10 days. The most recent releases landed on October 30, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Sci | 66 Days |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sci-map/id6560105262/reviews)** | [4.8 (260 ratings)](https://appshunter.io/ios/app/66-days-ai-interview-prep/id6752681422/reviews) |
| Number of ratings | 2 | **260** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 10 days |
| Monetization | **Free** | Freemium |
| Size | 33 MB | 110 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hands On Gainesville Inc](https://appshunter.io/developer/1758431842) | [Uru Technologies, LLC](https://appshunter.io/developer/1840551197) |

## What reviewers say

### Sci

[App page](https://appshunter.io/ios/app/sci-map/id6560105262)

Explore STEM concepts and problem-solving skills through hands-on activities tied to real-world locations. Search activities by site, STEM field, or curriculum standards. Activities are categorized for pre-visit, during-visit, and post-visit engagement.

**Highlights:** Hands-on STEM activities, Location-based exploration, Searchable by site name, Filter by STEM field, Curriculum standard alignment, Pre/during/post visit activities

**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 Sci free?

Sci 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, Sci or 66 Days?

Sci is rated higher. Sci averages 5.0 out of 5 from 2 ratings, while 66 Days averages 4.8 from 260 ratings.

### Do Sci or 66 Days have ads?

Neither Sci nor 66 Days shows ads.

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

Sci ships an update every 2 days, and 66 Days every 10 days. Most recently, Sci was updated on October 30, 2026 and 66 Days on November 8, 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.*