# Greybox Tool vs Reverse Voice

The clearest difference is rating: Reverse Voice at 4.3 against Greybox Tool's 2.5. Reverse Voice also leads on ratings volume (229 vs 2) and chart position (#182 vs unranked). Greybox Tool's advantage is in-app purchases (none vs 1) and iOS requirement (15.6 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Reverse Voice sells 1 in-app purchase, starting at $4.99 per 7 days. Greybox Tool asks for nothing beyond the download.

Reverse Voice holds the better App Store score, 4.3 against 2.5. That said, the two scores are not equally well evidenced: Reverse Voice has 229 ratings behind it against 2, so its average is the more settled of the two.

Greybox Tool ships an update every 2 weeks, Reverse Voice fortnightly. The most recent releases landed on October 9, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Greybox Tool | Reverse Voice |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (2 ratings)](https://appshunter.io/ios/app/greybox-tool/id6451376986/reviews) | **[4.3 (229 ratings)](https://appshunter.io/ios/app/reverse-voice-ai-changer/id6794034714/reviews)** |
| Number of ratings | 2 | **229** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#182** |
| Size | 19 MB | 153 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Yunfeng Wei](https://appshunter.io/developer/6808345644) | [Duc Duong Tran](https://appshunter.io/developer/1580090879) |

## What reviewers say

### Greybox Tool

[App page](https://appshunter.io/ios/app/greybox-tool/id6451376986)

A utility for developers to understand ad network operations. It allows manual triggering of postbacks and viewing device identifiers for debugging and attribution tracing. Developers can also inspect SKAdNetwork requests and postback content.

**Highlights:** Manual postback triggering, View device identifiers (IDFA, IDFV), Inspect SKAdNetwork requests, Share debugging information, Analyze ad network processes

**In-app purchases:** none


### Reverse Voice

[App page](https://appshunter.io/ios/app/reverse-voice-ai-changer/id6794034714)

**Currently charting:** #182 Top Free · Utilities (US App Store)

Transform audio by reversing it, adjusting playback speed and pitch, or applying AI voice styles. Flip images and explore creative audio-visual effects. Save and share your unique creations.

**Highlights:** Reverse audio recordings and imported files, Adjust playback speed and pitch, Apply AI voice styles, Flip photos horizontally and vertically, Save and share creations, In-app history for saved audio

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium Subcription | $4.99 | per 7 days |


## Frequently asked questions

### Is Greybox Tool free?

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

### Is Reverse Voice free?

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

### Which has better reviews, Greybox Tool or Reverse Voice?

Reverse Voice is rated higher. Greybox Tool averages 2.5 out of 5 from 2 ratings, while Reverse Voice averages 4.3 from 229 ratings.

### Do Greybox Tool or Reverse Voice have ads?

Neither Greybox Tool nor Reverse Voice shows ads.

### Which is updated more often, Greybox Tool or Reverse Voice?

Greybox Tool ships an update every 2 weeks, and Reverse Voice fortnightly. Most recently, Greybox Tool was updated on October 9, 2026 and Reverse Voice on October 25, 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.*