# ETC Library vs ControllerApp

The clearest difference is update cadence: ControllerApp at fortnightly against ETC Library's every 3 months. 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.

ETC Library ships an update every 3 months, ControllerApp fortnightly. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | ETC Library | ControllerApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/etc-library/id733300518/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 68 MB | 45 MB |
| Requires iOS | **17** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Electronic Theatre Controls, Inc.](https://appshunter.io/developer/318210459) | [Naor Bonomo](https://appshunter.io/developer/1799544328) |

## What reviewers say

### ETC Library

[App page](https://appshunter.io/ios/app/etc-library/id733300518)

Access technical documentation for a wide range of products. Browse and share datasheets, application sheets, and brochures organized by product family. This virtual binder provides quick access to essential product information.

**Highlights:** Access to hundreds of technical documents, Organized by product family and category, View datasheets, application sheets, and brochures, Easy document sharing, Offline access to downloaded documents

**Features:** Vision Pro support

**In-app purchases:** none


### ControllerApp

[App page](https://appshunter.io/ios/app/controllerapp/id6749446742)

**In-app purchases:** none


## Frequently asked questions

### Is ETC Library free?

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

### Is ControllerApp free?

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

### Do ETC Library or ControllerApp have ads?

Neither ETC Library nor ControllerApp shows ads.

### Which is updated more often, ETC Library or ControllerApp?

ETC Library ships an update every 3 months, and ControllerApp fortnightly. Most recently, ETC Library was updated on October 3, 2026 and ControllerApp on October 6, 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.*