# Contact Separator vs OT Subnet Calculator

The clearest difference is update cadence: Contact Separator at every 9 days against OT Subnet Calculator's every 3 weeks. Contact Separator also leads on iOS requirement (17.0 vs 26.2). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Contact Separator sells 2 in-app purchases, starting at $0.99 per month and OT Subnet Calculator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Contact Separator ships an update every 9 days, OT Subnet Calculator every 3 weeks. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Contact Separator | OT Subnet Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/contact-separator/id6477601880/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 11 MB | 8 MB |
| Requires iOS | **17.0** | 26.2 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Lars Herres](https://appshunter.io/developer/1713803692) | [Dominik Gausmann](https://appshunter.io/developer/1870320985) |

## What reviewers say

### Contact Separator

[App page](https://appshunter.io/ios/app/contact-separator/id6477601880)

This utility app allows you to separate your contacts into distinct lists, such as business and personal, and protects them from unauthorized third-party access. It also provides caller identification and identifies calls within your call history.

**Highlights:** Separate contacts from standard list, Caller Identification, Call History Identification, vCard Import, Privacy protection for contacts

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Abo | $0.99 | per month |
| Lifetime | $5.99 | one-time |


### OT Subnet Calculator

[App page](https://appshunter.io/ios/app/ot-subnet-calculator/id6758581610)

This app offers advanced IP subnet calculations and comprehensive IP address management (IPAM) tools. It helps organize networks, devices, and reservations with features like visual address maps, conflict checks, and collaboration options. Learn network concepts through guides and interactive examples.

**Highlights:** IPv4 subnet calculations, IP address management (IPAM), Network and device organization, Conflict detection, Collaboration via iCloud sync, CSV and PDF reporting, IPv6 exploration

**Features:** macOS Compatibility, Family Sharing, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| IP Calc Profi Features | $2.99 | one-time |


## Frequently asked questions

### Is Contact Separator free?

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

### Is OT Subnet Calculator free?

OT Subnet Calculator is free to download, with in-app purchases available.

### Do Contact Separator or OT Subnet Calculator have ads?

Neither Contact Separator nor OT Subnet Calculator shows ads.

### Which is updated more often, Contact Separator or OT Subnet Calculator?

Contact Separator ships an update every 9 days, and OT Subnet Calculator every 3 weeks. Most recently, Contact Separator was updated on November 4, 2026 and OT Subnet Calculator on November 5, 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.*