# Tap OChem vs Chromatography

The clearest difference is update cadence: Tap OChem at every 3 months against Chromatography's every 41 months. Chromatography's advantage is price ($1.99 vs $4.99) and iOS requirement (11.0 vs 13.2). On ads, in-app purchases and device support there is nothing between them.

Tap OChem costs $4.99 and Chromatography $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Tap OChem ships an update every 3 months, Chromatography every 41 months. The most recent releases landed on October 10, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Tap OChem | Chromatography |
| --- | --- | --- |
| Price | $4.99 | **$1.99** |
| Rating | **[4.7 (39 ratings)](https://appshunter.io/ios/app/tap-ochem/id579861146/reviews)** | — |
| Number of ratings | **39** | — |
| Positive reviews | 91.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 41 months |
| Monetization | Paid | — |
| Size | 3.5 GB | 75 MB |
| Requires iOS | 13.2 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tap OChem, LLC](https://appshunter.io/developer/579861209) | [VIRTUAL FILAMENTS PRIVATE LIMITED](https://appshunter.io/developer/1474217212) |

## 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


### Chromatography

[App page](https://appshunter.io/ios/app/chromatography/id1569139868)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Tap OChem free?

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

### Is Chromatography free?

Chromatography costs $1.99, with no in-app purchases.

### Do Tap OChem or Chromatography have ads?

Neither Tap OChem nor Chromatography shows ads.

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

Tap OChem ships an update every 3 months, and Chromatography every 41 months. Most recently, Tap OChem was updated on October 10, 2026 and Chromatography on October 3, 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.*