# PurEst® vs VIAVILab

The clearest difference is update cadence: VIAVILab at every 2 weeks against PurEst®'s every 5 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.

PurEst® ships an update every 5 months, VIAVILab every 2 weeks. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | PurEst® | VIAVILab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Size | 18 MB | 112 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Modality Apps](https://appshunter.io/developer/1122416398) | [NIRLAB Forensics Sarl](https://appshunter.io/developer/1590334637) |

## What reviewers say

### PurEst®

[App page](https://appshunter.io/ios/app/purest/id1122416399)

**Features:** macOS Compatibility

**In-app purchases:** none


### VIAVILab

[App page](https://appshunter.io/ios/app/viavilab/id6449706251)

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

**In-app purchases:** none


## Frequently asked questions

### Is PurEst® free?

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

### Is VIAVILab free?

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

### Do PurEst® or VIAVILab have ads?

Neither PurEst® nor VIAVILab shows ads.

### Which is updated more often, PurEst® or VIAVILab?

PurEst® ships an update every 5 months, and VIAVILab every 2 weeks. Most recently, PurEst® was updated on October 26, 2026 and VIAVILab 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.*