# EiS vs buchDB

The clearest difference is in-app purchases: buchDB at none against EiS's 2. buchDB also leads on update cadence (every 11 days vs every 4 months). EiS's advantage is iOS requirement (13.0 vs 16.4). On price, ads and device support there is nothing between them.

Both are free to download. EiS sells 2 in-app purchases, starting at $4.49 per month. buchDB asks for nothing beyond the download.

EiS ships an update every 4 months, buchDB every 11 days. The most recent releases landed on September 30, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | EiS | buchDB |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 11 days** |
| Monetization | Free with in-app purchases | — |
| Size | 81 MB | 55 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Wörterfabrik für unterstützte Kommunikation](https://appshunter.io/developer/1481083655) | [f5p UG (haftungsbeschraenkt)](https://appshunter.io/developer/1740522811) |

## What reviewers say

### EiS

[App page](https://appshunter.io/ios/app/eis-app/id1481083656)

This app teaches sign language for Augmentative and Alternative Communication (AAC) to children. It uses symbols, words, audio, and videos of children demonstrating signs, promoting inclusive learning and participation.

**Highlights:** Learn sign language for AAC, Includes METACOM symbols, words, audio, and videos, Demonstrations by children with and without disabilities, Inclusive and accessible design, Focus on core vocabulary, Continuous development based on user feedback

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EiS-App monthly subscription | $4.49 | per month |
| EiS-App yearly subscription | $44.99 | per year |


### buchDB

[App page](https://appshunter.io/ios/app/buchdb/id6760577929)

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

**In-app purchases:** none


## Frequently asked questions

### Is EiS free?

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

### Is buchDB free?

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

### Do EiS or buchDB have ads?

Neither EiS nor buchDB shows ads.

### Which is updated more often, EiS or buchDB?

EiS ships an update every 4 months, and buchDB every 11 days. Most recently, EiS was updated on September 30, 2026 and buchDB on October 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.*