# O3 vs Study Guard

The clearest difference is review sentiment: O3 at 91% against Study Guard's 27%. O3 also leads on monetization model (free with in-app purchases vs subscription) and rating (4.9 vs 4.6). Study Guard's advantage is ratings volume (390 vs 12). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. O3 sells 1 in-app purchase, starting at $6.00 per 7 days and Study Guard sells 6 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

O3 holds the better App Store score, 4.9 against 4.6. That said, the two scores are not equally well evidenced: Study Guard has 390 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 91% of O3's written reviews are positive against 27% of Study Guard's.

O3 ships an update every 9 days, Study Guard fortnightly. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | O3 | Study Guard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (12 ratings)](https://appshunter.io/ios/app/o3-study-with-friends/id6730118317/reviews)** | [4.6 (390 ratings)](https://appshunter.io/ios/app/study-guard-study-and-focus/id6744607430/reviews) |
| Number of ratings | 12 | **390** |
| Positive reviews | **90.9% of reviews** | 27.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Fortnightly |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 171 MB | 85 MB |
| Requires iOS | **16.0** | 17.4 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [O3 Platforms Limited](https://appshunter.io/developer/1850051015) | [Jason Mayo](https://appshunter.io/developer/1808403182) |

## What reviewers say

### O3

[App page](https://appshunter.io/ios/app/o3-study-with-friends/id6730118317)

Discover and access 24/7 study cafes designed for focused work and social interaction. Book spaces, connect with others, and enhance your productivity in a unique cafe environment.

**Highlights:** Unlock 24/7 study cafes, Book study spaces, Work and study environments, Meet new people, Socialize in cafes

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10HR COMBO | $6.00 | per 7 days |


### Study Guard

[App page](https://appshunter.io/ios/app/study-guard-study-and-focus/id6744607430)

This app transforms social media habits into a learning tool. It uses flashcard mastery to unlock social media access, ensuring focused study sessions. Create custom flashcards or generate them automatically from notes and PDFs.

**Highlights:** Social media leverage for motivation, Flashcard accountability for phone access, Custom flashcard creation, AI flashcard generator from notes/PDFs, Social media blocking during study, Progress tracking and insights, Unlimited flashcard sets

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Study Guard (Weekly) | $4.99 | per 7 days |
| Study Guard Plus | $5.99 | per month |
| Pro Plan (Yearly) | $19.99 | per year |
| Study Guard Plus Yearly | $24.99 | per year |
| Study Guard (Yearly) | $34.99 | per year |
| Study Guard (Lifetime) | $79.99 | one-time |


## Frequently asked questions

### Is O3 free?

O3 is free to download, with in-app purchases available.

### Is Study Guard free?

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

### Which has better reviews, O3 or Study Guard?

O3 is rated higher. O3 averages 4.9 out of 5 from 12 ratings, while Study Guard averages 4.6 from 390 ratings.

### Do O3 or Study Guard have ads?

Neither O3 nor Study Guard shows ads.

### Which is updated more often, O3 or Study Guard?

O3 ships an update every 9 days, and Study Guard fortnightly. Most recently, O3 was updated on November 4, 2026 and Study Guard on October 30, 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.*