# Overlay One vs Proselens

The clearest difference is price: Overlay One at Free against Proselens's $3.99. Proselens's advantage is update cadence (weekly vs every 3 weeks). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Overlay One is free to download; Proselens costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Overlay One ships an update every 3 weeks, Proselens weekly. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Overlay One | Proselens |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 21 MB | 5 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [玉苏甫江 艾西热甫](https://appshunter.io/developer/1085611107) | [Robert Corbin](https://appshunter.io/developer/1890247992) |

## What reviewers say

### Overlay One

[App page](https://appshunter.io/ios/app/overlay-one/id6770309850)

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

**In-app purchases:** none


### Proselens

[App page](https://appshunter.io/ios/app/proselens-writing-style-guide/id6776186983)

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

**In-app purchases:** none


## Frequently asked questions

### Is Overlay One free?

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

### Is Proselens free?

Proselens costs $3.99, with no in-app purchases.

### Do Overlay One or Proselens have ads?

Neither Overlay One nor Proselens shows ads.

### Which is updated more often, Overlay One or Proselens?

Overlay One ships an update every 3 weeks, and Proselens weekly. Most recently, Overlay One was updated on October 28, 2026 and Proselens 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.*