# Sigma Office vs PDF Editor

The clearest difference is in-app purchases: Sigma Office at none against PDF Editor's 3. PDF Editor's advantage is device support (4 vs 2). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. PDF Editor sells 3 in-app purchases, starting at $4.99 per month. Sigma Office asks for nothing beyond the download.

Sigma Office ships an update every 3 weeks, PDF Editor every 6 weeks. The most recent releases landed on November 7, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Sigma Office | PDF Editor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (95 ratings)](https://appshunter.io/ios/app/pdf-editor-pdf-readersigner/id6469578160/reviews)** |
| Number of ratings | — | **95** |
| Positive reviews | — | 33.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 81 MB | 22 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Joaquin Guevara](https://appshunter.io/developer/1443082715) | [AppDash LLC](https://appshunter.io/developer/1795398749) |

## What reviewers say

### Sigma Office

[App page](https://appshunter.io/ios/app/sigma-office/id1533340093)

**In-app purchases:** none


### PDF Editor

[App page](https://appshunter.io/ios/app/pdf-editor-pdf-readersigner/id6469578160)

Edit, sign, and annotate PDF documents with ease. This app allows you to fill forms, add stamps, manage pages, and even chat with your PDFs for content understanding and translation.

**Highlights:** Marking and annotation tools, Signature creation and saving, Stamp insertion and customization, Page editing (merge, split, rotate), Form filling (standard and interactive), PDF chat for content analysis, Bookmark management

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Month Subscription | $4.99 | per month |
| PDF Year Subscription | $39.99 | per year |
| Lifetime | $49.99 | one-time |

**What reviewers like**

- 🚀 Efficient PDF management
- 👍 User-friendly interface
- 💡 Versatile digital companion
- 🚀 Time-saving features
- 👍 Personalized digital workspace

**What reviewers complain about**

- 🐛 Crashes and stability issues
- 🔒 Subscription-based model
- 👎 Difficult to edit PDFs
- 👎 Limited free features
- 👎 Confusing user experience

**Reported bugs**

- Crashes when searching PDFs
- Inability to restore purchases
- Repeated prompts to purchase despite being a paid user
- Locked PDFs after making edits
- Incompatibility with certain devices

**Requested features**

- Improved PDF text editing capabilities
- Seamless integration with cloud storage
- Customizable view settings and defaults
- Ability to disable link highlighting
- Clear save button and auto-save functionality


## Frequently asked questions

### Is Sigma Office free?

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

### Is PDF Editor free?

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

### Do Sigma Office or PDF Editor have ads?

Neither Sigma Office nor PDF Editor shows ads.

### Which is updated more often, Sigma Office or PDF Editor?

Sigma Office ships an update every 3 weeks, and PDF Editor every 6 weeks. Most recently, Sigma Office was updated on November 7, 2026 and PDF Editor on November 12, 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.*