# Stackwax vs Mellow FM

The clearest difference is in-app purchases: Mellow FM at none against Stackwax's 3. Stackwax's advantage is update cadence (every 5 days vs every 2 months) and iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Stackwax sells 3 in-app purchases, starting at $4.99 per month. Mellow FM asks for nothing beyond the download.

Stackwax ships an update every 5 days, Mellow FM every 2 months. The most recent releases landed on September 24, 2026 and June 26, 2026 respectively.

## The numbers

| Metric | Stackwax | Mellow FM |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 months |
| Size | 18 MB | 3 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Martin Allais](https://appshunter.io/developer/1895003438) | [Yoshiyuki Koyama](https://appshunter.io/developer/1866580603) |

## What reviewers say

### Stackwax

[App page](https://appshunter.io/ios/app/stackwax/id6762770909)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stackwax Pro Monthly | $4.99 | per month |
| Stackwax Pro Annual | $34.99 | per year |
| Stackwax Pro Lifetime | $49.99 | one-time |


### Mellow FM

[App page](https://appshunter.io/ios/app/mellow-fm/id6763243053)

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

**In-app purchases:** none


## Frequently asked questions

### Is Stackwax free?

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

### Is Mellow FM free?

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

### Do Stackwax or Mellow FM have ads?

Neither Stackwax nor Mellow FM shows ads.

### Which is updated more often, Stackwax or Mellow FM?

Stackwax ships an update every 5 days, and Mellow FM every 2 months. Most recently, Stackwax was updated on September 24, 2026 and Mellow FM on June 26, 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.*