# HPLC Calculator vs Atriumy

The clearest difference is in-app purchases: Atriumy at none against HPLC Calculator's 6. Atriumy also leads on ads (none vs shown) and update cadence (every 4 days vs every 5 weeks). HPLC Calculator's advantage is iOS requirement (13.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. HPLC Calculator sells 6 in-app purchases, starting at $0.59 per month. Atriumy asks for nothing beyond the download.

HPLC Calculator ships an update every 5 weeks, Atriumy every 4 days. The most recent releases landed on October 19, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | HPLC Calculator | Atriumy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 4 days** |
| Size | 66 MB | 9 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Youhana Mehany](https://appshunter.io/developer/1600330996) | [Atriumy](https://appshunter.io/developer/1792642336) |

## What reviewers say

### HPLC Calculator

[App page](https://appshunter.io/ios/app/hplc-calculator/id1600330994)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.59 | per month |
| Remove Ads | $4.99 | per year |
| 50K Token Top-Up | $2.99 | one-time |
| 100K Token Top-Up | $4.99 | one-time |
| 250K Token Top-Up | $9.99 | one-time |
| 500K Token Top-Up | $12.99 | one-time |


### Atriumy

[App page](https://appshunter.io/ios/app/atriumy/id6741027768)

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

**In-app purchases:** none


## Frequently asked questions

### Is HPLC Calculator free?

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

### Is Atriumy free?

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

### Do HPLC Calculator or Atriumy have ads?

HPLC Calculator shows ads; Atriumy does not.

### Which is updated more often, HPLC Calculator or Atriumy?

HPLC Calculator ships an update every 5 weeks, and Atriumy every 4 days. Most recently, HPLC Calculator was updated on October 19, 2026 and Atriumy on October 7, 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.*