# Lock PV vs Siga Tracking

The clearest difference is update cadence: Siga Tracking at every 8 months against Lock PV's every 18 months. Lock PV's advantage is iOS requirement (12.0 vs 15.1). 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.

Lock PV ships an update every 18 months, Siga Tracking every 8 months. The most recent releases landed on September 28, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Lock PV | Siga Tracking |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 8 months** |
| Size | 33 MB | 35 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 17+ |
| Developer | [Marcelo Soares](https://appshunter.io/developer/1144995004) | [Softruck](https://appshunter.io/developer/1254561953) |

## What reviewers say

### Lock PV

[App page](https://appshunter.io/ios/app/lock-pv/id6450878613)

**Features:** macOS Compatibility

**In-app purchases:** none


### Siga Tracking

[App page](https://appshunter.io/ios/app/siga-tracking/id6478226661)

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

**In-app purchases:** none


## Frequently asked questions

### Is Lock PV free?

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

### Is Siga Tracking free?

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

### Do Lock PV or Siga Tracking have ads?

Neither Lock PV nor Siga Tracking shows ads.

### Which is updated more often, Lock PV or Siga Tracking?

Lock PV ships an update every 18 months, and Siga Tracking every 8 months. Most recently, Lock PV was updated on September 28, 2026 and Siga Tracking 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.*