# GoPdf.io vs Mechanical Sound ID

The clearest difference is in-app purchases: Mechanical Sound ID at none against GoPdf.io's 2. GoPdf.io's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. GoPdf.io sells 2 in-app purchases, starting at $9.99 per month. Mechanical Sound ID asks for nothing beyond the download.

GoPdf.io ships an update every 2 weeks, Mechanical Sound ID fortnightly. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | GoPdf.io | Mechanical Sound ID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/gopdfio/id6468447409/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 21 MB | 36 MB |
| Requires iOS | **15.0** | 15.8.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KAYA SMART LLC](https://appshunter.io/developer/1641097768) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### GoPdf.io

[App page](https://appshunter.io/ios/app/gopdfio/id6468447409)

This app offers a comprehensive suite of tools for managing PDF documents. It allows users to scan, fill, sign, convert, merge, protect, and compress PDFs, streamlining document workflows.

**Highlights:** Scan documents to PDF, Fill and sign PDF forms, Convert PDF to JPG, Convert PDF to Word, Merge multiple PDFs, Password protect PDFs, Compress PDF files

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $9.99 | per month |
| Yearly | $99.99 | per year |


### Mechanical Sound ID

[App page](https://appshunter.io/ios/app/mechanical-sound-id/id6738972003)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GoPdf.io free?

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

### Is Mechanical Sound ID free?

Mechanical Sound ID is free to download, with no in-app purchases.

### Do GoPdf.io or Mechanical Sound ID have ads?

Mechanical Sound ID shows ads; GoPdf.io does not.

### Which is updated more often, GoPdf.io or Mechanical Sound ID?

GoPdf.io ships an update every 2 weeks, and Mechanical Sound ID fortnightly. Most recently, GoPdf.io was updated on October 24, 2026 and Mechanical Sound ID on October 9, 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.*