# Tap OChem vs BrainRetain

The clearest difference is price: BrainRetain at Free against Tap OChem's $4.99. BrainRetain also leads on update cadence (every 5 days vs every 3 months) and rating (5.0 vs 4.7). Tap OChem's advantage is in-app purchases (none vs 3) and ratings volume (39 vs 4). On ads there is nothing between them.

BrainRetain is free to download; Tap OChem costs $4.99 up front. BrainRetain sells 3 in-app purchases, starting at $4.99 per 7 days. Tap OChem asks for nothing beyond the download.

BrainRetain holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Tap OChem has 39 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 92% of Tap OChem's written reviews are positive against 100% of BrainRetain's.

Tap OChem ships an update every 3 months, BrainRetain every 5 days. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Tap OChem | BrainRetain |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [4.7 (39 ratings)](https://appshunter.io/ios/app/tap-ochem/id579861146/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/brainretain-remember-it/id6769563092/reviews)** |
| Number of ratings | **39** | 4 |
| Positive reviews | 91.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | Paid | **Freemium** |
| Size | 3.5 GB | 66 MB |
| Requires iOS | **13.2** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tap OChem, LLC](https://appshunter.io/developer/579861209) | [Bering Digital Group LLC](https://appshunter.io/developer/1896668816) |

## What reviewers say

### Tap OChem

[App page](https://appshunter.io/ios/app/tap-ochem/id579861146)

Visualize complex organic chemistry reactions and concepts with animated explanations. This app covers a wide range of undergraduate organic chemistry topics, aiding in exam preparation and understanding of molecular behavior.

**Highlights:** Animated organic chemistry reactions, Detailed concept explanations, Electron pushing diagrams, Full-color text descriptions, MCAT, PCAT, OAT, DAT prep, Regular content updates

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

**In-app purchases:** none


### BrainRetain

[App page](https://appshunter.io/ios/app/brainretain-remember-it/id6769563092)

This app helps you retain information from videos, podcasts, and articles using spaced repetition. Share content, and it will extract key ideas, quizzing you over time to ensure long-term memory. It supports various platforms and aims to make online learning stick.

**Highlights:** Spaced repetition learning, Content sharing from various apps, Extracts key ideas from content, Personalized recall algorithm, Supports videos, podcasts, articles, Long-term memory retention

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BrainRetain Pro | $4.99 | per 7 days |
| BrainRetain Pro (Monthly) | $9.99 | per month |
| BrainRetain Pro - Annual | $79.99 | per year |


## Frequently asked questions

### Is Tap OChem free?

Tap OChem costs $4.99, with no in-app purchases.

### Is BrainRetain free?

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

### Which has better reviews, Tap OChem or BrainRetain?

BrainRetain is rated higher. Tap OChem averages 4.7 out of 5 from 39 ratings, while BrainRetain averages 5.0 from 4 ratings.

### Do Tap OChem or BrainRetain have ads?

Neither Tap OChem nor BrainRetain shows ads.

### Which is updated more often, Tap OChem or BrainRetain?

Tap OChem ships an update every 3 months, and BrainRetain every 5 days. Most recently, Tap OChem was updated on October 10, 2026 and BrainRetain on October 14, 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.*