# Vacuum Link vs HPLC Calculator

The clearest difference is in-app purchases: Vacuum Link at none against HPLC Calculator's 6. Vacuum Link also leads on ads (none vs shown) and iOS requirement (8.0 vs 13.0). HPLC Calculator's advantage is update cadence (every 5 weeks vs every 18 months). 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. Vacuum Link asks for nothing beyond the download.

Vacuum Link ships an update every 18 months, HPLC Calculator every 5 weeks. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Vacuum Link | HPLC Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 18 months | **Every 5 weeks** |
| Size | 65 MB | 66 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Agilent Technologies, Inc](https://appshunter.io/developer/355827609) | [Youhana Mehany](https://appshunter.io/developer/1600330996) |

## What reviewers say

### Vacuum Link

[App page](https://appshunter.io/ios/app/vacuum-link/id1457811255)

**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 Vacuum Link free?

Vacuum Link 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 Vacuum Link or HPLC Calculator have ads?

HPLC Calculator shows ads; Vacuum Link does not.

### Which is updated more often, Vacuum Link or HPLC Calculator?

Vacuum Link ships an update every 18 months, and HPLC Calculator every 5 weeks. Most recently, Vacuum Link was updated on October 26, 2026 and HPLC Calculator on October 27, 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.*