# ETC Library vs Plotly

The clearest difference is in-app purchases: ETC Library at none against Plotly's 1. Plotly's advantage is update cadence (every 3 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Plotly sells 1 one-off in-app purchase. ETC Library asks for nothing beyond the download.

ETC Library ships an update every 3 months, Plotly every 3 days. The most recent releases landed on August 15, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | ETC Library | Plotly |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 68 MB | 1 MB |
| Requires iOS | 17 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Electronic Theatre Controls, Inc.](https://appshunter.io/developer/318210459) | [Jhomar Maravillas](https://appshunter.io/developer/6783703541) |

## 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


### Plotly

[App page](https://appshunter.io/ios/app/plotly-stage-plot-maker/id6792488544)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Unlimited | $4.99 | one-time |


## Frequently asked questions

### Is ETC Library free?

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

### Is Plotly free?

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

### Do ETC Library or Plotly have ads?

Neither ETC Library nor Plotly shows ads.

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

ETC Library ships an update every 3 months, and Plotly every 3 days. Most recently, ETC Library was updated on August 15, 2026 and Plotly on September 27, 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.*