# EqCalc vs cella

The clearest difference is update cadence: cella at every 10 days against EqCalc's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. EqCalc sells 1 one-off in-app purchase and cella sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

EqCalc ships an update every 2 months, cella every 10 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | EqCalc | 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 | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | — | Freemium |
| Size | 11 MB | 71 MB |
| Requires iOS | 18.2 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Jon Tonouchi](https://appshunter.io/developer/1814163396) | [武汉回到未来科技有限公司](https://appshunter.io/developer/1891400712) |

## What reviewers say

### EqCalc

[App page](https://appshunter.io/ios/app/eqcalc-g/id6759407516)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Version | $2.99 | one-time |


### 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 EqCalc free?

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

### Is cella free?

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

### Do EqCalc or cella have ads?

Neither EqCalc nor cella shows ads.

### Which is updated more often, EqCalc or cella?

EqCalc ships an update every 2 months, and cella every 10 days. Most recently, EqCalc was updated on November 5, 2026 and cella on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*