# isfizz vs Spindles

The clearest difference is price: Spindles at Free against isfizz's $2.99. Spindles also leads on rating (5.0 vs 4.7) and update cadence (every 5 days vs fortnightly). isfizz's advantage is in-app purchases (none vs 5) and iOS requirement (15.0 vs 18.0). On review sentiment, ratings volume, ads and device support there is nothing between them.

Spindles is free to download; isfizz costs $2.99 up front. Spindles sells 5 in-app purchases, starting at $6.99 per month. isfizz asks for nothing beyond the download.

Spindles holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 14 and 10 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

isfizz ships an update fortnightly, Spindles every 5 days. The most recent releases landed on September 19, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | isfizz | Spindles |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.7 (14 ratings)](https://appshunter.io/ios/app/isfizz/id6470708963/reviews) | **[5.0 (10 ratings)](https://appshunter.io/ios/app/spindles/id6479562471/reviews)** |
| Number of ratings | **14** | 10 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 5 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 6 MB | 26 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ryouta Kira](https://appshunter.io/developer/862984358) | [Redsquared Inc](https://appshunter.io/developer/1736324648) |

## What reviewers say

### isfizz

[App page](https://appshunter.io/ios/app/isfizz/id6470708963)

This app plays SFZ files, an open format for sampled sound instruments. It supports various audio file formats, MIDI, and Scala tuning files. It also functions as an Audio Unit Extension (AUv3) for use with other music apps.

**Highlights:** SFZ file playback, Audio Unit Extension (AUv3) support, Edit SFZ strings, Load SFZ files in place, Scala tuning file support, MIDI support

**Features:** Vision Pro support

**In-app purchases:** none


### Spindles

[App page](https://appshunter.io/ios/app/spindles/id6479562471)

Experience a curated sound environment designed for sleep, focus, and calm. Featuring analog music, soundscapes, and auditory patterns, it supports gradual transitions and sustained states for better rest and reduced anxiety. Enjoy a refined listening experience with intelligent playback controls.

**Highlights:** Purpose-composed analog and acoustic music, Immersive soundscapes, Gentle auditory patterns, Supports sleep, focus, and calm, Gradual transitions and sustained states, Intelligent playlist flow, Flexible playback controls

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Individual Renews Monthly | $6.99 | per month |
| Family Access Renews Monthly | $10.99 | per month |
| Individual Renews Annually | $69.99 | per year |
| Family Access Renews Annually | $110.99 | per year |
| Lifetime Access to Spindles | $299.99 | one-time |


## Frequently asked questions

### Is isfizz free?

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

### Is Spindles free?

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

### Which has better reviews, isfizz or Spindles?

Spindles is rated higher. isfizz averages 4.7 out of 5 from 14 ratings, while Spindles averages 5.0 from 10 ratings.

### Do isfizz or Spindles have ads?

Neither isfizz nor Spindles shows ads.

### Which is updated more often, isfizz or Spindles?

isfizz ships an update fortnightly, and Spindles every 5 days. Most recently, isfizz was updated on September 19, 2026 and Spindles on September 12, 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.*