# FFT vs Spark

The clearest difference is price: Spark at Free against FFT's $10.99. Spark also leads on rating (4.8 vs 4.0) and update cadence (every 2 weeks vs every 6 months). FFT's advantage is review sentiment (86% vs 55%). On ads, in-app purchases, monetization model and device support there is nothing between them.

Spark is free to download; FFT costs $10.99 up front. FFT sells 1 one-off in-app purchase and Spark sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Spark holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Spark has 25K ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 86% of FFT's written reviews are positive against 55% of Spark's, so the app with the better star average is not the one people write more warmly about.

FFT ships an update every 6 months, Spark every 2 weeks. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | FFT | Spark |
| --- | --- | --- |
| Price | $10.99 | **Free** |
| Rating | [4.0 (6 ratings)](https://appshunter.io/ios/app/fft/id298840058/reviews) | **[4.8 (25K ratings)](https://appshunter.io/ios/app/spark-chords-backing-tracks/id1457653921/reviews)** |
| Number of ratings | 6 | **25K** |
| Positive reviews | **86.1% of reviews** | 54.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 30 MB | 562 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 17+ |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [Positive Grid Inc](https://appshunter.io/developer/751979910) |

## What reviewers say

### FFT

[App page](https://appshunter.io/ios/app/fft/id298840058)

Analyze audio with high-resolution frequency and amplitude graphs. Features include a signal generator, cursor readouts, and adjustable graph smoothing. Save and export your analysis results.

**Highlights:** High-resolution amplitude vs. frequency graph, Built-in low-distortion signal generator, Adjustable graph smoothing and decay time, Cursor readout for dB and frequency, Save and export analysis graphs and data, Peak tracking for highest frequency identification

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reference Curve Files | $9.99 | one-time |


### Spark

[App page](https://appshunter.io/ios/app/spark-chords-backing-tracks/id1457653921)

This intelligent amp and app combination creates a virtual band that learns your playing style to generate accompanying bass and drums. Access millions of songs with auto-displayed chords, over 10,000 tones, and voice command functionality. It's designed to enhance your practice and performance experience.

**Highlights:** Auto chord display for millions of songs, Smart Jam with AI-generated bass and drums, Voice command control, BIAS tone engine with 10,000+ presets, Tempo control and looping for practice, Realistic virtual tube amps and effects

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Experience Jimi Hendrix™ | $19.99 | one-time |

**What reviewers like**

- 🚀 Versatile, powerful, and full of features
- 👍 Great sound quality and tone options
- 🎨 Impressive amp and effects modeling
- 💡 Useful smart jam and play-along features
- 🎸 Excellent for practice and jamming

**What reviewers complain about**

- 🐛 Connectivity and pairing issues with app
- 🐛 Buggy app with crashes and glitches
- 🔍 Difficult to organize and find saved tones
- 🔊 Muddy or harsh tones at times
- 🔋 Battery life could be better

**Reported bugs**

- App frequently disconnects from amp
- Tone selection issues and inconsistencies
- Sudden loud noises or feedback from amp
- Firmware update process is cumbersome
- Spotify integration not working as advertised

**Requested features**

- Add looping functionality
- Improve auto-chord detection and playback
- Allow more customization of signal chain and effects
- Integrate with more music services beyond Spotify
- Add EQ controls for Bluetooth speaker mode


## Frequently asked questions

### Is FFT free?

FFT costs $10.99, and also offers in-app purchases.

### Is Spark free?

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

### Which has better reviews, FFT or Spark?

Spark is rated higher. FFT averages 4.0 out of 5 from 6 ratings, while Spark averages 4.8 from 25K ratings.

### Do FFT or Spark have ads?

Neither FFT nor Spark shows ads.

### Which is updated more often, FFT or Spark?

FFT ships an update every 6 months, and Spark every 2 weeks. Most recently, FFT was updated on October 14, 2026 and Spark on October 16, 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.*