# Domain Check vs CiS

The clearest difference is in-app purchases: CiS at none against Domain Check's 1. CiS also leads on update cadence (every 2 months vs every 14 months) and iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Domain Check sells 1 one-off in-app purchase. CiS asks for nothing beyond the download.

Domain Check ships an update every 14 months, CiS every 2 months. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Domain Check | CiS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/domain-check/id649317039/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 6 MB | 58 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Geekme](https://appshunter.io/developer/823506026) | [CEJN](https://appshunter.io/developer/1384445211) |

## What reviewers say

### Domain Check

[App page](https://appshunter.io/ios/app/domain-check/id649317039)

Instantly retrieve detailed WHOIS information for any website using real WHOIS servers. Check domain availability, view comprehensive details, and maintain a history of your queries. Supports all top-level domains.

**Highlights:** Real WHOIS server queries, Unlimited queries, All TLD support, Domain availability check, Detailed domain information, Query history

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Advertising | $0.99 | one-time |


### CiS

[App page](https://appshunter.io/ios/app/cis-cejn/id1384445212)

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

**In-app purchases:** none


## Frequently asked questions

### Is Domain Check free?

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

### Is CiS free?

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

### Do Domain Check or CiS have ads?

Neither Domain Check nor CiS shows ads.

### Which is updated more often, Domain Check or CiS?

Domain Check ships an update every 14 months, and CiS every 2 months. Most recently, Domain Check was updated on October 23, 2026 and CiS on October 26, 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.*