# CIDR vs PDF Scanner · OCR Docs

The clearest difference is ads: CIDR at none against PDF Scanner · OCR Docs's shown. PDF Scanner · OCR Docs's advantage is update cadence (every 3 days vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. CIDR sells 1 one-off in-app purchase and PDF Scanner · OCR Docs sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

CIDR ships an update every 3 weeks, PDF Scanner · OCR Docs every 3 days. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CIDR | PDF Scanner · OCR Docs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cidr/id1564239813/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | Free | — |
| Size | 23 MB | 94 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [akira ohmachi](https://appshunter.io/developer/1338624340) | [UPDEITO INC.](https://appshunter.io/developer/1113275046) |

## What reviewers say

### CIDR

[App page](https://appshunter.io/ios/app/cidr/id1564239813)

This utility calculates IP address ranges from an IP address and subnet mask. It supports IPv4 calculations, including prefix display, address range counts, and bit notation. Useful for quick CIDR notation checks and subnet mask conversions.

**Highlights:** IP address range calculation, Subnet mask to CIDR conversion, IPv4 prefix display, Number of address ranges, Bit notation display, Quick reference table

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### PDF Scanner · OCR Docs

[App page](https://appshunter.io/ios/app/pdf-scanner-ocr-docs/id6757154986)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide ads | $12.99 | one-time |


## Frequently asked questions

### Is CIDR free?

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

### Is PDF Scanner · OCR Docs free?

PDF Scanner · OCR Docs is free to download, with in-app purchases available.

### Do CIDR or PDF Scanner · OCR Docs have ads?

PDF Scanner · OCR Docs shows ads; CIDR does not.

### Which is updated more often, CIDR or PDF Scanner · OCR Docs?

CIDR ships an update every 3 weeks, and PDF Scanner · OCR Docs every 3 days. Most recently, CIDR was updated on October 2, 2026 and PDF Scanner · OCR Docs on October 7, 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.*