# m/z vs HPLC Calculator

The clearest difference is in-app purchases: m/z at none against HPLC Calculator's 6. m/z also leads on ads (none vs shown) and iOS requirement (6.0 vs 13.0). On price, update cadence 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. m/z asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 5 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | m/z | HPLC Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (5 ratings)](https://appshunter.io/ios/app/mz/id1117272212/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | Every 5 weeks |
| Monetization | Free | — |
| Size | 3.6 GB | 66 MB |
| Requires iOS | **6.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kirill Blinov](https://appshunter.io/developer/630833420) | [Youhana Mehany](https://appshunter.io/developer/1600330996) |

## What reviewers say

### m/z

[App page](https://appshunter.io/ios/app/mz/id1117272212)

Instantly search a vast database of chemical structures based on their exact mass. This tool helps identify compounds with masses under 340 Da, drawing from millions of entries.

**Highlights:** Find chemical structures by exact mass, Search database of known structures, Database includes over 35 million compounds, Supports masses under 340 Da, Utilizes PubChem compounds database

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is m/z free?

m/z is free to download, with no in-app purchases.

### Is HPLC Calculator free?

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

### Do m/z or HPLC Calculator have ads?

HPLC Calculator shows ads; m/z does not.

### Which is updated more often, m/z or HPLC Calculator?

m/z ships an update every 5 weeks, and HPLC Calculator every 5 weeks. Most recently, m/z was updated on November 2, 2026 and HPLC Calculator on November 3, 2026.

---

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