# MPInventory vs Lock On

The clearest difference is in-app purchases: MPInventory at none against Lock On's 6. Lock On's advantage is update cadence (every 4 months vs every 11 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Lock On sells 6 in-app purchases, starting at $6.99 per month. MPInventory asks for nothing beyond the download.

MPInventory ships an update every 11 months, Lock On every 4 months. The most recent releases landed on November 13, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | MPInventory | Lock On |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 4 months** |
| Size | 13 MB | 51 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [MOBIL POHOTOVOST GSM s.r.o.](https://appshunter.io/developer/1299966713) | [BinVision Solutions Inc.](https://appshunter.io/developer/1834990667) |

## What reviewers say

### MPInventory

[App page](https://appshunter.io/ios/app/mpinventory/id1299966714)

**Features:** macOS Compatibility

**In-app purchases:** none


### Lock On

[App page](https://appshunter.io/ios/app/lock-on-limit-screen-time/id6760328819)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro - Monthly | $6.99 | per month |
| Pro - Annual | $59.99 | per year |
| 5 Credits | $4.99 | one-time |
| 10 Credits | $9.99 | one-time |
| 25 Credits | $24.99 | one-time |
| 50 Credits | $49.99 | one-time |


## Frequently asked questions

### Is MPInventory free?

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

### Is Lock On free?

Lock On is free to download, with in-app purchases available.

### Do MPInventory or Lock On have ads?

Neither MPInventory nor Lock On shows ads.

### Which is updated more often, MPInventory or Lock On?

MPInventory ships an update every 11 months, and Lock On every 4 months. Most recently, MPInventory was updated on November 13, 2026 and Lock On on November 5, 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.*