# NS Docs vs Class surveyor

The clearest difference is update cadence: Class surveyor at every 7 months against NS Docs's every 16 months. Class surveyor also leads on iOS requirement (11.0 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NS Docs ships an update every 16 months, Class surveyor every 7 months. Both last shipped on September 10, 2026.

## The numbers

| Metric | NS Docs | Class surveyor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 7 months** |
| Size | 54 MB | 58 MB |
| Requires iOS | 16.6 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ABS Nautical System LLC](https://appshunter.io/developer/1194431728) | [OLEKSANDR IZERGIN](https://appshunter.io/developer/1678396126) |

## What reviewers say

### NS Docs

[App page](https://appshunter.io/ios/app/ns-docs/id1491309568)

**Features:** macOS Compatibility

**In-app purchases:** none


### Class surveyor

[App page](https://appshunter.io/ios/app/class-surveyor/id6450609017)

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

**In-app purchases:** none


## Frequently asked questions

### Is NS Docs free?

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

### Is Class surveyor free?

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

### Do NS Docs or Class surveyor have ads?

Neither NS Docs nor Class surveyor shows ads.

### Which is updated more often, NS Docs or Class surveyor?

NS Docs ships an update every 16 months, and Class surveyor every 7 months. Most recently, NS Docs was updated on September 10, 2026 and Class surveyor on September 10, 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.*