# Sentinel Pro vs SlangDecoder

The clearest difference is price: Sentinel Pro at Free against SlangDecoder's $2.99. Sentinel Pro also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (13.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Sentinel Pro is free to download; SlangDecoder costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Sentinel Pro ships an update every 3 weeks, SlangDecoder every 2 months. The most recent releases landed on September 21, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | Sentinel Pro | SlangDecoder |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Size | 3 MB | 4 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ben Software Ltd](https://appshunter.io/developer/1142125927) | [Greg Anderson](https://appshunter.io/developer/345127565) |

## What reviewers say

### Sentinel Pro

[App page](https://appshunter.io/ios/app/sentinel-pro/id1581444500)

**Features:** macOS Compatibility

**In-app purchases:** none


### SlangDecoder

[App page](https://appshunter.io/ios/app/slangdecoder/id6761937094)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sentinel Pro free?

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

### Is SlangDecoder free?

SlangDecoder costs $2.99, with no in-app purchases.

### Do Sentinel Pro or SlangDecoder have ads?

Neither Sentinel Pro nor SlangDecoder shows ads.

### Which is updated more often, Sentinel Pro or SlangDecoder?

Sentinel Pro ships an update every 3 weeks, and SlangDecoder every 2 months. Most recently, Sentinel Pro was updated on September 21, 2026 and SlangDecoder on September 5, 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.*