# SustEarn vs Frequency Detector Analyzer

The clearest difference is in-app purchases: SustEarn at none against Frequency Detector Analyzer's 2. SustEarn also leads on update cadence (every 10 days vs every 2 months) and iOS requirement (12.4 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Frequency Detector Analyzer sells 2 in-app purchases, starting at $8.99 per 7 days. SustEarn asks for nothing beyond the download.

SustEarn ships an update every 10 days, Frequency Detector Analyzer every 2 months. The most recent releases landed on October 2, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | SustEarn | Frequency Detector Analyzer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (20 ratings)](https://appshunter.io/ios/app/frequency-detector-analyzer/id6752298079/reviews)** |
| Number of ratings | — | **20** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 months |
| Monetization | — | Free with in-app purchases |
| Size | 41 MB | 65 MB |
| Requires iOS | **12.4** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Harshit Kanodia](https://appshunter.io/developer/1456221091) | [NEURASYNC](https://appshunter.io/developer/1639101560) |

## What reviewers say

### SustEarn

[App page](https://appshunter.io/ios/app/sustearn/id1666982947)

**Features:** macOS Compatibility

**In-app purchases:** none


### Frequency Detector Analyzer

[App page](https://appshunter.io/ios/app/frequency-detector-analyzer/id6752298079)

This application transforms your device into a precise sound analysis tool. It offers real-time frequency detection, visualization, and data logging for musicians, engineers, and curious individuals. Gain clarity and accuracy in understanding the soundscape around you.

**Highlights:** Live frequency tuner, Spectrogram visualization, Automatic logging and CSV export, Customizable logging interval, Elegant and modern design, Reliable performance

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Frequency Detector Weekly Sub | $8.99 | per 7 days |
| Frequency Detector Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is SustEarn free?

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

### Is Frequency Detector Analyzer free?

Frequency Detector Analyzer is free to download, with in-app purchases available.

### Do SustEarn or Frequency Detector Analyzer have ads?

Neither SustEarn nor Frequency Detector Analyzer shows ads.

### Which is updated more often, SustEarn or Frequency Detector Analyzer?

SustEarn ships an update every 10 days, and Frequency Detector Analyzer every 2 months. Most recently, SustEarn was updated on October 2, 2026 and Frequency Detector Analyzer on October 14, 2026.

---

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