# App Lock vs SMS2PDF

The clearest difference is in-app purchases: App Lock at none against SMS2PDF's 2. SMS2PDF's advantage is iOS requirement (13.0 vs 16.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. SMS2PDF sells 2 in-app purchases, starting at $5.00 per month. App Lock asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | App Lock | SMS2PDF |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | Every 4 days |
| Size | 33 MB | 55 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [宝锋 张](https://appshunter.io/developer/1643161885) | [Shai Spetgang](https://appshunter.io/developer/1016286298) |

## What reviewers say

### App Lock

[App page](https://appshunter.io/ios/app/app-lock-block-apps/id6777914542)

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

**In-app purchases:** none


### SMS2PDF

[App page](https://appshunter.io/ios/app/sms2pdf/id6780619696)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SMS2PDF Pro Monthly | $5.00 | per month |
| SMS2PDF Pro Yearly | $40.00 | per year |


## Frequently asked questions

### Is App Lock free?

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

### Is SMS2PDF free?

SMS2PDF is free to download, with in-app purchases available.

### Do App Lock or SMS2PDF have ads?

Neither App Lock nor SMS2PDF shows ads.

### Which is updated more often, App Lock or SMS2PDF?

App Lock ships an update every 4 days, and SMS2PDF every 4 days. Most recently, App Lock was updated on October 8, 2026 and SMS2PDF on October 1, 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.*