# Decibels vs PDF Studio(Pro)

The clearest difference is price: Decibels at Free against PDF Studio(Pro)'s $2.99. PDF Studio(Pro)'s advantage is in-app purchases (none vs 1) and update cadence (every 2 days vs every 5 months). On ads and device support there is nothing between them.

Decibels is free to download; PDF Studio(Pro) costs $2.99 up front. Decibels sells 1 one-off in-app purchase. PDF Studio(Pro) asks for nothing beyond the download.

Decibels ships an update every 5 months, PDF Studio(Pro) every 2 days. The most recent releases landed on October 17, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Decibels | PDF Studio(Pro) |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 days** |
| Size | 6 MB | 42 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Merano Studio Limited](https://appshunter.io/developer/1783493234) | [Hrishi Suthar](https://appshunter.io/developer/1660005858) |

## What reviewers say

### Decibels

[App page](https://appshunter.io/ios/app/decibels/id6749821741)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Leave a Tip | $0.99 | one-time |


### PDF Studio(Pro)

[App page](https://appshunter.io/ios/app/pdf-studiopro/id6757748809)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Decibels free?

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

### Is PDF Studio(Pro) free?

PDF Studio(Pro) costs $2.99, with no in-app purchases.

### Do Decibels or PDF Studio(Pro) have ads?

Neither Decibels nor PDF Studio(Pro) shows ads.

### Which is updated more often, Decibels or PDF Studio(Pro)?

Decibels ships an update every 5 months, and PDF Studio(Pro) every 2 days. Most recently, Decibels was updated on October 17, 2026 and PDF Studio(Pro) on October 12, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*