# STZ vs Flicker Meter for Light

The clearest difference is in-app purchases: STZ at none against Flicker Meter for Light's 4. Flicker Meter for Light's advantage is update cadence (every 2 months vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Flicker Meter for Light sells 4 in-app purchases, starting at $0.99 per month. STZ asks for nothing beyond the download.

STZ ships an update every 8 months, Flicker Meter for Light every 2 months. Both last shipped on October 27, 2026.

## The numbers

| Metric | STZ | Flicker Meter for Light |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (54 ratings)](https://appshunter.io/ios/app/flicker-meter-for-light-pwm/id1672848632/reviews)** |
| Number of ratings | — | **54** |
| Positive reviews | — | 62.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | — | Free with in-app purchases |
| Size | 22 MB | 43 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dominik Kedzierski](https://appshunter.io/developer/1611447563) | [Contechity AB](https://appshunter.io/developer/1649290454) |

## What reviewers say

### STZ

[App page](https://appshunter.io/ios/app/stz-7/id1669229641)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flicker Meter for Light

[App page](https://appshunter.io/ios/app/flicker-meter-for-light-pwm/id1672848632)

Detect and measure invisible high-frequency flickering in LED lights and screens that can cause eye strain and headaches. Find flicker-free alternatives to improve your comfort and health.

**Highlights:** Detect invisible high-frequency flickering, Measure flicker intensity (%), Measure flicker frequency (Hz), Identify flicker-free light sources, Easy-to-use interface, Instant results

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full access | $0.99 | per month |
| Full access | $4.99 | per year |
| Full access | $6.99 | one-time |
| Full access | $9.99 | one-time |


## Frequently asked questions

### Is STZ free?

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

### Is Flicker Meter for Light free?

Flicker Meter for Light is free to download, with in-app purchases available.

### Do STZ or Flicker Meter for Light have ads?

Neither STZ nor Flicker Meter for Light shows ads.

### Which is updated more often, STZ or Flicker Meter for Light?

STZ ships an update every 8 months, and Flicker Meter for Light every 2 months. Most recently, STZ was updated on October 27, 2026 and Flicker Meter for Light on October 27, 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.*