# TWDIW vs Lens Smudge Detection

The clearest difference is ads: TWDIW at none against Lens Smudge Detection's shown. TWDIW also leads on iOS requirement (13.0 vs 26.5). Lens Smudge Detection's advantage is update cadence (weekly vs every 3 weeks). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

TWDIW ships an update every 3 weeks, Lens Smudge Detection weekly. Both last shipped on October 25, 2026.

## The numbers

| Metric | TWDIW | Lens Smudge Detection |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 200 MB | 42 MB |
| Requires iOS | **13.0** | 26.5 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [數位發展部](https://appshunter.io/developer/1759963812) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### TWDIW

[App page](https://appshunter.io/ios/app/twdiw/id6742222992)

**In-app purchases:** none


### Lens Smudge Detection

[App page](https://appshunter.io/ios/app/lens-smudge-detection/id6771600873)

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

**In-app purchases:** none


## Frequently asked questions

### Is TWDIW free?

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

### Is Lens Smudge Detection free?

Lens Smudge Detection is free to download, with no in-app purchases.

### Do TWDIW or Lens Smudge Detection have ads?

Lens Smudge Detection shows ads; TWDIW does not.

### Which is updated more often, TWDIW or Lens Smudge Detection?

TWDIW ships an update every 3 weeks, and Lens Smudge Detection weekly. Most recently, TWDIW was updated on October 25, 2026 and Lens Smudge Detection on October 25, 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.*