# i花椒 vs cella

The clearest difference is in-app purchases: i花椒 at none against cella's 1. i花椒 also leads on iOS requirement (9.0 vs 17.0). cella's advantage is update cadence (every 10 days vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. cella sells 1 one-off in-app purchase. i花椒 asks for nothing beyond the download.

i花椒 ships an update every 6 months, cella every 10 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | i花椒 | cella |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cella-crystal-viewer/id6790140743/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 10 days** |
| Monetization | — | Freemium |
| Size | 188 MB | 71 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [华东交通大学](https://appshunter.io/developer/1070814938) | [武汉回到未来科技有限公司](https://appshunter.io/developer/1891400712) |

## What reviewers say

### i花椒

[App page](https://appshunter.io/ios/app/i/id1181352992)

**Features:** macOS Compatibility

**In-app purchases:** none


### cella

[App page](https://appshunter.io/ios/app/cella-crystal-viewer/id6790140743)

Explore crystal structures in interactive 3D. Visualize atomic arrangements, view different molecular models, and access a curated atlas of common materials. Supports CIF file import and export with a one-time purchase.

**Highlights:** Interactive 3D crystal exploration, Fifteen visual Cell Notes, Curated structure atlas, Multiple view modes (ball-and-stick, space-filling), Unit cell and (hkl) plane visualization, CIF file import and export (Pro), No ads, tracking, or analytics

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| cella Pro | $5.99 | one-time |


## Frequently asked questions

### Is i花椒 free?

i花椒 is free to download, with no in-app purchases.

### Is cella free?

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

### Do i花椒 or cella have ads?

Neither i花椒 nor cella shows ads.

### Which is updated more often, i花椒 or cella?

i花椒 ships an update every 6 months, and cella every 10 days. Most recently, i花椒 was updated on November 2, 2026 and cella on October 31, 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.*