# HPLC Calculator vs Year Timer

The clearest difference is in-app purchases: Year Timer at none against HPLC Calculator's 6. Year Timer also leads on update cadence (every 8 days vs every 5 weeks). HPLC Calculator's advantage is iOS requirement (13.0 vs 16.0). On price, ads 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. Year Timer asks for nothing beyond the download.

HPLC Calculator ships an update every 5 weeks, Year Timer every 8 days. The most recent releases landed on October 3, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | HPLC Calculator | Year Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 5 weeks | **Every 8 days** |
| Size | 66 MB | 23 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Youhana Mehany](https://appshunter.io/developer/1600330996) | [kohei saiki](https://appshunter.io/developer/1640963707) |

## 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 |


### Year Timer

[App page](https://appshunter.io/ios/app/year-timer/id1640963703)

**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 Year Timer free?

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

### Do HPLC Calculator or Year Timer have ads?

Both HPLC Calculator and Year Timer show ads.

### Which is updated more often, HPLC Calculator or Year Timer?

HPLC Calculator ships an update every 5 weeks, and Year Timer every 8 days. Most recently, HPLC Calculator was updated on October 3, 2026 and Year Timer on October 10, 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.*