# Flicker Check vs PDF Lock & Unlock

The clearest difference is device support: PDF Lock & Unlock at 3 against Flicker Check's 1. PDF Lock & Unlock also leads on iOS requirement (15.1 vs 18.6). On price, ads and in-app purchases there is nothing between them.

Flicker Check costs $0.99 and PDF Lock & Unlock $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Flicker Check | PDF Lock & Unlock |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Size | 3 MB | 25 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Raj Sheth](https://appshunter.io/developer/976941598) | [StudyBridge LLC](https://appshunter.io/developer/1830101876) |

## What reviewers say

### Flicker Check

[App page](https://appshunter.io/ios/app/flicker-check/id6756520447)

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

**In-app purchases:** none


### PDF Lock & Unlock

[App page](https://appshunter.io/ios/app/pdf-lock-and-unlock/id6756542477)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flicker Check free?

Flicker Check costs $0.99, with no in-app purchases.

### Is PDF Lock & Unlock free?

PDF Lock & Unlock costs $0.99, with no in-app purchases.

### Do Flicker Check or PDF Lock & Unlock have ads?

Neither Flicker Check nor PDF Lock & Unlock shows ads.

---

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