# CIDR vs Overtime Calculator plus

The clearest difference is in-app purchases: Overtime Calculator plus at none against CIDR's 1. Overtime Calculator plus also leads on iOS requirement (11.0 vs 15.6). CIDR's advantage is update cadence (every 3 weeks vs every 17 months). On price, ads and device support there is nothing between them.

Both are free to download. CIDR sells 1 one-off in-app purchase. Overtime Calculator plus asks for nothing beyond the download.

CIDR ships an update every 3 weeks, Overtime Calculator plus every 17 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | CIDR | Overtime Calculator plus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cidr/id1564239813/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 17 months |
| Monetization | Free | — |
| Size | 23 MB | 31 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [akira ohmachi](https://appshunter.io/developer/1338624340) | [AMAR AWNI](https://appshunter.io/developer/1551109915) |

## 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 |


### Overtime Calculator plus

[App page](https://appshunter.io/ios/app/overtime-calculator-plus/id1615042862)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CIDR free?

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

### Is Overtime Calculator plus free?

Overtime Calculator plus is free to download, with no in-app purchases.

### Do CIDR or Overtime Calculator plus have ads?

Neither CIDR nor Overtime Calculator plus shows ads.

### Which is updated more often, CIDR or Overtime Calculator plus?

CIDR ships an update every 3 weeks, and Overtime Calculator plus every 17 months. Most recently, CIDR was updated on November 3, 2026 and Overtime Calculator plus on November 3, 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.*