# COB vs Sign PDF

The clearest difference is in-app purchases: COB at none against Sign PDF's 10. COB also leads on iOS requirement (15.5 vs 18). Sign PDF's advantage is update cadence (every 2 weeks vs every 6 weeks). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Sign PDF sells 10 in-app purchases, starting at $2.99 per 7 days. COB asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for COB against 5.0 for Sign PDF. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

COB ships an update every 6 weeks, Sign PDF every 2 weeks. The most recent releases landed on September 8, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | COB | Sign PDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/cob-eoffice/id1578068882/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/sign-pdf-esign-and-fill-forms/id6763507968/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 45 MB | 43 MB |
| Requires iOS | **15.5** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Co-opBank](https://appshunter.io/developer/1578068884) | [DECLAN JOHN NANTON](https://appshunter.io/developer/1888733891) |

## What reviewers say

### COB

[App page](https://appshunter.io/ios/app/cob-eoffice/id1578068882)

This electronic office solution streamlines business operations with digital document management and workflow automation. It aims to enhance efficiency and accessibility for corporate users.

**Highlights:** Electronic office solution, Digital document management, Workflow automation, Business operations enhancement, Increased efficiency

**Features:** macOS Compatibility

**In-app purchases:** none


### Sign PDF

[App page](https://appshunter.io/ios/app/sign-pdf-esign-and-fill-forms/id6763507968)

Easily sign, fill, and scan documents directly from your iPhone. Add signatures, stamps, and text to PDFs without needing to print or use a computer. All your work stays private on your device.

**Highlights:** eSign PDFs by drawing, typing, or importing, Add custom stamps and seals with background removal, Built-in document scanner to PDF, Instantly fill out PDF forms, Save multiple signatures and stamps, Export flattened, device-consistent PDFs, Privacy-focused, on-device processing

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| eSign & Fill Contracts | $2.99 | per 7 days |
| Stamp, Seal & Scan Pass | $3.99 | per 7 days |
| Fill Forms Pro Monthly | $6.99 | per month |
| Paperwork Pass — 3 Months | $7.99 | per 3 months |
| PDF Editor & Scanner Plan | $9.99 | per month |
| Sign Documents Quarterly | $9.99 | per 3 months |
| Contract Kit — 3 Months | $12.99 | per 3 months |
| Annual — Unlimited Signatures | $19.99 | per year |
| Unlimited Signatures Annual | $29.99 | per year |
| eSignature & Stamps Yearly | $39.99 | per year |


## Frequently asked questions

### Is COB free?

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

### Is Sign PDF free?

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

### Which has better reviews, COB or Sign PDF?

COB and Sign PDF are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do COB or Sign PDF have ads?

Neither COB nor Sign PDF shows ads.

### Which is updated more often, COB or Sign PDF?

COB ships an update every 6 weeks, and Sign PDF every 2 weeks. Most recently, COB was updated on September 8, 2026 and Sign PDF on September 4, 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.*