# ZoneClock vs Flicker Insight

The clearest difference is price: ZoneClock at Free against Flicker Insight's $0.99. ZoneClock also leads on in-app purchases (none vs 2) and iOS requirement (16.6 vs 18.0). Flicker Insight's advantage is update cadence (every 2 days vs weekly). On ads and device support there is nothing between them.

ZoneClock is free to download; Flicker Insight costs $0.99 up front. Flicker Insight sells 2 one-off in-app purchases. ZoneClock asks for nothing beyond the download.

ZoneClock ships an update weekly, Flicker Insight every 2 days. The most recent releases landed on November 9, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | ZoneClock | Flicker Insight |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flicker-insight-pwm-test/id6794661401/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 60.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Monetization | — | Paid |
| Size | 9 MB | 212 MB |
| Requires iOS | **16.6** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Andrei Lupanin](https://appshunter.io/developer/1882669105) | [名楷 王](https://appshunter.io/developer/1896763218) |

## What reviewers say

### ZoneClock

[App page](https://appshunter.io/ios/app/zoneclock/id6760105465)

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

**In-app purchases:** none


### Flicker Insight

[App page](https://appshunter.io/ios/app/flicker-insight-pwm-test/id6794661401)

Detects imperceptible light flicker from various sources like screens and bulbs that can cause eye strain. Offers detailed metrics, ambient light and color temperature estimates, and generates exportable reports. Prioritizes user privacy with offline functionality and no ads.

**Highlights:** Quick flicker test with camera, Eye comfort assessment, Detailed flicker metrics, Ambient illuminance estimate, Color temperature estimate, PDF report generation, Offline functionality

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A Popsicle | $0.99 | one-time |
| A Coffee | $2.99 | one-time |


## Frequently asked questions

### Is ZoneClock free?

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

### Is Flicker Insight free?

Flicker Insight costs $0.99, and also offers in-app purchases.

### Do ZoneClock or Flicker Insight have ads?

Neither ZoneClock nor Flicker Insight shows ads.

### Which is updated more often, ZoneClock or Flicker Insight?

ZoneClock ships an update weekly, and Flicker Insight every 2 days. Most recently, ZoneClock was updated on November 9, 2026 and Flicker Insight on November 13, 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.*