# KCFIR vs FlickerSpec

The clearest difference is in-app purchases: KCFIR at none against FlickerSpec's 1. KCFIR also leads on iOS requirement (12.0 vs 26.0). FlickerSpec's advantage is update cadence (every 11 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. FlickerSpec sells 1 one-off in-app purchase. KCFIR asks for nothing beyond the download.

KCFIR ships an update every 3 weeks, FlickerSpec every 11 days. The most recent releases landed on September 17, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | KCFIR | FlickerSpec |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 11 days** |
| Size | 18 MB | 12 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Kang Cheng Century Technology Co., Ltd.](https://appshunter.io/developer/1448125513) | [Corey Thomas Slick](https://appshunter.io/developer/1818871667) |

## What reviewers say

### KCFIR

[App page](https://appshunter.io/ios/app/kcfir/id1448125514)

**In-app purchases:** none


### FlickerSpec

[App page](https://appshunter.io/ios/app/flickerspec-led-flicker-test/id6759629660)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FlickerSpec Pro | $49.99 | one-time |


## Frequently asked questions

### Is KCFIR free?

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

### Is FlickerSpec free?

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

### Do KCFIR or FlickerSpec have ads?

Neither KCFIR nor FlickerSpec shows ads.

### Which is updated more often, KCFIR or FlickerSpec?

KCFIR ships an update every 3 weeks, and FlickerSpec every 11 days. Most recently, KCFIR was updated on September 17, 2026 and FlickerSpec on September 11, 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.*