# Viana 2 vs ByCS

The clearest difference is monetization model: ByCS at free against Viana 2's paid. ByCS also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.4). On price, review sentiment, update cadence and ads there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Viana 2 | ByCS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 42.3% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Paid | **Free** |
| Size | 19 MB | 251 MB |
| Requires iOS | 17.4 | **15.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Freie Universitaet Berlin](https://appshunter.io/developer/1031084427) | [Manage Now GmbH im Auftrag d. bay. Staatsregierung](https://appshunter.io/developer/1847562750) |

## What reviewers say

### Viana 2

[App page](https://appshunter.io/ios/app/viana-2/id1554845327)

This app allows users to record and analyze motion from videos. It automatically determines the trajectory, position, and velocity of objects, offering advanced graphing and coordinate system tools for physics education.

**Highlights:** Record and analyze motion from videos, Automatic trajectory, position, and velocity determination, Adjustable video frame rates, Object tracking with marker adjustment, Display up to three graph types simultaneously, New phase diagram types, Real-time coordinate system and graph comparison, Export and import projects

**In-app purchases:** none


### ByCS

[App page](https://appshunter.io/ios/app/bycs-messenger/id6446783774)

Secure and free communication for Bavarian schools, enabling quick information and file exchange. Features include voice calls, messages, location sharing, and flexible availability settings, all within a privacy-compliant environment.

**Highlights:** Privacy-compliant school communication, Secure user access, Voice calls and voice messages, Location sharing, Customizable availability times, Integration with ByCS-Drive, Create video conferences

**Features:** Siri integration, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Viana 2 free?

Viana 2 is free to download, with no in-app purchases.

### Is ByCS free?

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

### Do Viana 2 or ByCS have ads?

Neither Viana 2 nor ByCS shows ads.

### Which is updated more often, Viana 2 or ByCS?

Viana 2 ships an update every 2 months, and ByCS every 2 months. Most recently, Viana 2 was updated on November 3, 2026 and ByCS 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.*