# RFCReader Pro vs IPv4 Subnet Calculator

The clearest difference is price: IPv4 Subnet Calculator at Free against RFCReader Pro's $1.99. IPv4 Subnet Calculator also leads on review sentiment (100% vs 63%) and iOS requirement (15.1 vs 17.0). RFCReader Pro's advantage is ads (none vs shown) and update cadence (every 3 months vs every 35 months). On in-app purchases and device support there is nothing between them.

IPv4 Subnet Calculator is free to download; RFCReader Pro costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RFCReader Pro ships an update every 3 months, IPv4 Subnet Calculator every 35 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | RFCReader Pro | IPv4 Subnet Calculator |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[5.0 (8 ratings)](https://appshunter.io/ios/app/ipv4-subnet-calculator/id6446788822/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | 62.5% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 35 months |
| Monetization | Paid | **Ad-supported** |
| Size | 3 MB | 22 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [飞 龙](https://appshunter.io/developer/965611281) | [Daniel Nogueira](https://appshunter.io/developer/1679074829) |

## What reviewers say

### RFCReader Pro

[App page](https://appshunter.io/ios/app/rfcreader-pro/id1036461920)

Access and read technical internet standards documents efficiently. Features include keyword search, bookmarking, text styling, and offline reading. Supports PDF and HTML formats with navigation aids.

**Highlights:** List all RFC documents, Search RFC by keywords or number, Add RFC to favorites, Mark and style text, Offline RFC reading, Read RFC in PDF and HTML formats, Navigate via Table of Contents and thumbnails

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

**In-app purchases:** none


### IPv4 Subnet Calculator

[App page](https://appshunter.io/ios/app/ipv4-subnet-calculator/id6446788822)

This utility simplifies IPv4 subnet calculations for network professionals and students. Quickly obtain detailed subnet information like network address, broadcast address, and host ranges by entering an IP address and CIDR or subnet mask.

**Highlights:** Easy-to-use interface, Detailed subnet information, Supports CIDR and subnet mask input, Responsive design for various screen sizes, Calculates network address, broadcast address, and host ranges

**In-app purchases:** none


## Frequently asked questions

### Is RFCReader Pro free?

RFCReader Pro costs $1.99, with no in-app purchases.

### Is IPv4 Subnet Calculator free?

IPv4 Subnet Calculator is free to download, with no in-app purchases.

### Do RFCReader Pro or IPv4 Subnet Calculator have ads?

IPv4 Subnet Calculator shows ads; RFCReader Pro does not.

### Which is updated more often, RFCReader Pro or IPv4 Subnet Calculator?

RFCReader Pro ships an update every 3 months, and IPv4 Subnet Calculator every 35 months. Most recently, RFCReader Pro was updated on October 24, 2026 and IPv4 Subnet Calculator on October 24, 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.*