# Signed URL vs Chemister

The clearest difference is update cadence: Chemister at every 4 months against Signed URL's every 22 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Signed URL ships an update every 22 months, Chemister every 4 months. The most recent releases landed on September 22, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Signed URL | Chemister |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 4 months** |
| Size | 39 MB | 28 MB |
| Requires iOS | 13.0 | 13 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NXP Semiconductors](https://appshunter.io/developer/383827086) | [SILICON CRAFT TECHNOLOGY PUBLIC COMPANY LIMITED](https://appshunter.io/developer/1279674870) |

## What reviewers say

### Signed URL

[App page](https://appshunter.io/ios/app/signed-url/id1508896647)

**Features:** macOS Compatibility

**In-app purchases:** none


### Chemister

[App page](https://appshunter.io/ios/app/chemister-ca/id6443787192)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Signed URL free?

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

### Is Chemister free?

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

### Do Signed URL or Chemister have ads?

Neither Signed URL nor Chemister shows ads.

### Which is updated more often, Signed URL or Chemister?

Signed URL ships an update every 22 months, and Chemister every 4 months. Most recently, Signed URL was updated on September 22, 2026 and Chemister on June 1, 2026.

---

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