# COOP.66 vs PhiDr

The clearest difference is in-app purchases: COOP.66 at none against PhiDr's 3. PhiDr's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. PhiDr sells 3 in-app purchases, starting at $2.99 per 7 days. COOP.66 asks for nothing beyond the download.

## The numbers

| Metric | COOP.66 | PhiDr |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/phidr/id6755478588/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | — | Every 10 days |
| Monetization | — | Free with in-app purchases |
| Size | 67 MB | 56 MB |
| Requires iOS | 16.1 | **15.1** |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [DIGITAL KINGDOM INVEST JOINT STOCK COMPANY](https://appshunter.io/developer/1592238093) | [Hoang Nguyen](https://appshunter.io/developer/1854113147) |

## What reviewers say

### COOP.66

[App page](https://appshunter.io/ios/app/coop66/id1619454008)

**In-app purchases:** none


### PhiDr

[App page](https://appshunter.io/ios/app/phidr/id6755478588)

A community platform for intellectually curious individuals, including PhD students and researchers. It prioritizes meaningful connections based on shared academic interests and research, with a focus on fostering offline discussions.

**Highlights:** Academic profiling, Privacy-first discovery, Curated daily connections, Weekly engagement cycle, Focus on offline meetings

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium Monthly | $6.99 | per month |
| Premium 3 Months | $14.99 | per 3 months |


## Frequently asked questions

### Is COOP.66 free?

COOP.66 is free to download, with no in-app purchases.

### Is PhiDr free?

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

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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.*