# Decibel X PRO vs RulerBasic

The clearest difference is price: RulerBasic at Free against Decibel X PRO's $0.99. RulerBasic also leads on update cadence (fortnightly vs every 8 months) and iOS requirement (16.0 vs 18.4). Decibel X PRO's advantage is in-app purchases (none vs 4). On ads and device support there is nothing between them.

RulerBasic is free to download; Decibel X PRO costs $0.99 up front. RulerBasic sells 4 in-app purchases, starting at $2.99 per month. Decibel X PRO asks for nothing beyond the download.

Decibel X PRO ships an update every 8 months, RulerBasic fortnightly. Both last shipped on October 10, 2026.

## The numbers

| Metric | Decibel X PRO | RulerBasic |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Fortnightly** |
| Size | 3 MB | 15 MB |
| Requires iOS | 18.4 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Grzegorz Rakoca](https://appshunter.io/developer/1778459428) | [Hakan Kaba](https://appshunter.io/developer/1830840381) |

## What reviewers say

### Decibel X PRO

[App page](https://appshunter.io/ios/app/decibel-x-pro-db-sound-meter/id6747031691)

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

**In-app purchases:** none


### RulerBasic

[App page](https://appshunter.io/ios/app/rulerbasic/id6752628913)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Room Scan Pro | $2.99 | per month |
| Small Tip | $1.99 | one-time |
| Medium Tip | $4.99 | one-time |
| Large Tip | $9.99 | one-time |


## Frequently asked questions

### Is Decibel X PRO free?

Decibel X PRO costs $0.99, with no in-app purchases.

### Is RulerBasic free?

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

### Do Decibel X PRO or RulerBasic have ads?

Neither Decibel X PRO nor RulerBasic shows ads.

### Which is updated more often, Decibel X PRO or RulerBasic?

Decibel X PRO ships an update every 8 months, and RulerBasic fortnightly. Most recently, Decibel X PRO was updated on October 10, 2026 and RulerBasic on October 10, 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.*