# Lucky S vs Sign PDF Documents & Forms

The clearest difference is in-app purchases: Lucky S at none against Sign PDF Documents & Forms's 2. Lucky S also leads on iOS requirement (15.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Sign PDF Documents & Forms sells 2 in-app purchases, starting at $12.99 per 7 days. Lucky S asks for nothing beyond the download.

Lucky S ships an update every 9 days, Sign PDF Documents & Forms fortnightly. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Lucky S | Sign PDF Documents & Forms |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Fortnightly |
| Size | 118 MB | 28 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Zhengzhou Baodao Technology Co., Ltd.](https://appshunter.io/developer/1602308525) | [Yan Ramanovich](https://appshunter.io/developer/6789653776) |

## What reviewers say

### Lucky S

[App page](https://appshunter.io/ios/app/lucky-s/id6747330785)

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

**In-app purchases:** none


### Sign PDF Documents & Forms

[App page](https://appshunter.io/ios/app/sign-pdf-documents-and-forms/id6789653774)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $12.99 | per 7 days |
| Annually | $79.99 | per year |


## Frequently asked questions

### Is Lucky S free?

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

### Is Sign PDF Documents & Forms free?

Sign PDF Documents & Forms is free to download, with in-app purchases available.

### Do Lucky S or Sign PDF Documents & Forms have ads?

Neither Lucky S nor Sign PDF Documents & Forms shows ads.

### Which is updated more often, Lucky S or Sign PDF Documents & Forms?

Lucky S ships an update every 9 days, and Sign PDF Documents & Forms fortnightly. Most recently, Lucky S was updated on October 24, 2026 and Sign PDF Documents & Forms on October 21, 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.*