# MaiPDF vs Sift

The clearest difference is in-app purchases: MaiPDF at none against Sift's 2. MaiPDF also leads on iOS requirement (15.0 vs 18.0). Sift's advantage is update cadence (every 2 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Sift sells 2 in-app purchases, starting at $2.99 per month. MaiPDF asks for nothing beyond the download.

MaiPDF ships an update every 3 weeks, Sift every 2 days. The most recent releases landed on October 12, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | MaiPDF | Sift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/maipdf-secure-pdf/id6782001233/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 35 MB | 4 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [嘉峰 黄](https://appshunter.io/developer/6780922729) | [Charles Ley Baldemor](https://appshunter.io/developer/6805788145) |

## What reviewers say

### MaiPDF

[App page](https://appshunter.io/ios/app/maipdf-secure-pdf/id6782001233)

Securely share PDFs with full control over access, device usage, and expiry. Protect your documents with anti-screenshot features and traceable watermarks. Revoke access instantly to prevent leaks.

**Highlights:** Anti-screenshot protection, Traceable watermark, Device binding and limits, Access expiry, Recipient whitelisting, Instant revocation, Secure .maipdf format

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

**In-app purchases:** none


### Sift

[App page](https://appshunter.io/ios/app/sift-screenshot-sorter/id6817036290)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sift Pro Monthly | $2.99 | per month |
| Sift Pro Yearly | $19.99 | per year |


## Frequently asked questions

### Is MaiPDF free?

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

### Is Sift free?

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

### Do MaiPDF or Sift have ads?

Neither MaiPDF nor Sift shows ads.

### Which is updated more often, MaiPDF or Sift?

MaiPDF ships an update every 3 weeks, and Sift every 2 days. Most recently, MaiPDF was updated on October 12, 2026 and Sift on October 29, 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.*