# PDF Max Pro vs StoneFlow

The clearest difference is price: StoneFlow at Free against PDF Max Pro's $9.99. StoneFlow also leads on iOS requirement (15.0 vs 18.0). PDF Max Pro's advantage is device support. On in-app purchases there is nothing between them.

StoneFlow is free to download; PDF Max Pro costs $9.99 up front. PDF Max Pro sells 4 in-app purchases, starting at $2.99 per 7 days and StoneFlow sells 1 in-app purchase, starting at $39.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | PDF Max Pro | StoneFlow |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.5 (1.5K ratings)](https://appshunter.io/ios/app/pdf-max-pro-edit-sign-pdfs/id552664144/reviews)** | — |
| Number of ratings | **1.5K** | — |
| Positive reviews | 41.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | — |
| Update frequency | Monthly | — |
| Monetization | Free with in-app purchases | — |
| Size | 266 MB | 1 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | **iPhone, iPad, Mac** | — |
| Age rating | +4 | 12+ |
| Developer | [Mobeera](https://appshunter.io/developer/540572076) | [Reon Coetzee](https://appshunter.io/developer/1891785462) |

## What reviewers say

### PDF Max Pro

[App page](https://appshunter.io/ios/app/pdf-max-pro-edit-sign-pdfs/id552664144)

This app provides comprehensive tools for reading, annotating, and editing PDF documents on mobile devices. Users can highlight, add text and voice notes, fill out forms, manage pages, and organize files with cloud integration.

**Highlights:** Read and annotate PDFs, Highlight, underline, strike out text, Add text, voice, and custom stamps, Fill and sign PDF forms, Manage PDF pages and outlines, Cloud storage integration (Dropbox, Google Drive), Organize files with color tags and favorites

**Features:** Family Sharing, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Subscription (1 week) | $2.99 | per 7 days |
| One year Premium | $34.99 | per year |
| Onboarding Yearly Offer | $34.99 | per year |
| Premium Package | $4.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Great features
- 🚀 Excellent PDF editing tools
- 👍 Useful for documentation

**What reviewers complain about**

- 🐛 Crashes frequently
- 🐛 Loses data/annotations
- 💰 Expensive subscription
- 🐛 Compatibility issues with new iOS versions
- 🐛 Unreliable file management

**Reported bugs**

- App crashes when opening certain PDF files
- Annotations and edits not saving properly
- Inability to restore previous in-app purchases
- Syncing issues with Dropbox and Google Drive

**Requested features**

- Add text-to-speech and speech-to-text functionality
- Improve integration with cloud storage services
- Enhance annotation tools and responsiveness
- Provide better documentation and support


### StoneFlow

[App page](https://appshunter.io/ios/app/stoneflow/id6761858408)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StoneFlow Monthly | $39.99 | per month |


## Frequently asked questions

### Is PDF Max Pro free?

PDF Max Pro costs $9.99, and also offers in-app purchases.

### Is StoneFlow free?

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

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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.*