# ZEISS Observe vs CNS+

ZEISS Observe and CNS+ are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

ZEISS Observe ships an update every 7 months, CNS+ every 4 months. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ZEISS Observe | CNS+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/cns-plus/id1580882992/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 months** |
| Monetization | — | Free |
| Size | 39 MB | 116 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Carl Zeiss AG](https://appshunter.io/developer/488066215) | [Congress of Neurological Surgeons](https://appshunter.io/developer/551149057) |

## What reviewers say

### ZEISS Observe

[App page](https://appshunter.io/ios/app/zeiss-observe/id1436174038)

**In-app purchases:** none


### CNS+

[App page](https://appshunter.io/ios/app/cns-plus/id1580882992)

Access a comprehensive collection of neurological surgery educational resources, including guidelines, publications, and courses. Manage your professional development with features like 'My Education' and 'My CME'.

**Highlights:** CNS Guidelines access, CNS Publications access, My Education & My CME integration, Case of the Month, Neurosurgery Watch, Podcasts, Courses & Webinars

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

**In-app purchases:** none


## Frequently asked questions

### Is ZEISS Observe free?

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

### Is CNS+ free?

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

### Do ZEISS Observe or CNS+ have ads?

Neither ZEISS Observe nor CNS+ shows ads.

### Which is updated more often, ZEISS Observe or CNS+?

ZEISS Observe ships an update every 7 months, and CNS+ every 4 months. Most recently, ZEISS Observe was updated on October 26, 2026 and CNS+ on October 30, 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.*