variStretch vs FFT AUv3 Visualizer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
variStretch
This app allows real-time audio speed manipulation without altering pitch. It offers three distinct playback modes and adjustable buffer settings for precise control over sound processing.
- Real-time speed adjustment (0.5-2.0x)
- Tape mode (speed & pitch change)
- Phase Vocoder mode (speed only)
- Adjustable buffer size
- Buffer clear function
- AUv3 host compatibility
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Concept: The app is a so-called time-stretch machine. The user can change the speed (0.5-2.0) of audio source in real-time using keyboard or slider at will. Usage: There are three play modes: 1) Tape (to change the both speed & pitch) 2) Phase Vocoder (to change the speed alone) 3) Thru (no processing) "Buffer Size" slider determines how long the data will be stored. "Buffer Clear" button will reset the buffer to be zero. System Requirements: AUv3 host
FFT AUv3 Visualizer
This real-time spectral analyzer visualizes audio into spectrograms with high precision. It offers advanced features like mel-scale mapping and intelligent color coding to help musicians and audio engineers analyze sound frequencies for mixing, mastering, and sound design.
- Real-time spectral analysis
- High-resolution 4096-sample FFT
- Mel-scale frequency mapping
- 90dB dynamic range with intelligent color mapping
- Resizable interface
- 60Hz display with 75% overlap
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FFT is a real-time spectral analyzer designed specifically for musicians, producers, and audio engineers who demand precision in their frequency domain analysis. This plugin transforms your audio into visual spectrogram, featuring a high-resolution 4096-sample FFT engine that captures every nuance of your sound. With its advanced Blackman-Harris windowing and mel-scale frequency mapping, FFT provides perceptually accurate frequency representation that mirrors how your ears actually hear music. The plugin offers 90dB dynamic range with intelligent color mapping that highlights different frequency bands—from deep blues for sub-bass through vibrant greens for midrange to warm reds for sparkling highs. Whether you're mixing, mastering, sound designing, or analyzing acoustic spaces, FFT's real-time 60Hz display with 75% overlap ensures smooth, responsive visualization that helps you make critical EQ decisions, identify problematic frequencies, monitor stereo imaging, and understand the spectral content of your tracks with scientific precision. The resizable interface adapts to your workflow, making it an indispensable tool for any serious audio professional seeking to visualize and understand their sound in the frequency domain.
Screenshots
Verdict
The clearest difference is price: FFT AUv3 Visualizer at $0.99 against variStretch's $5.99. variStretch's advantage is iOS requirement (12.0 vs 15.0). On rating, ratings volume, update cadence and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
variStretch costs $5.99 and FFT AUv3 Visualizer $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for variStretch against 5.0 for FFT AUv3 Visualizer. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
variStretch ships an update every 7 months, FFT AUv3 Visualizer every 8 months. The most recent releases landed on September 6, 2026 and September 20, 2026 respectively.
| Parameter | variStretch | FFT AUv3 Visualizer |
|---|---|---|
| Price | $5.99 | $0.99 — better |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 7 months — better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 15 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Satoshi Kajii | DiscoDSP LLC |
Customer experience
variStretch
FFT AUv3 Visualizer
In-app purchases
variStretch
No in-app purchases
FFT AUv3 Visualizer
No in-app purchases
Questions
Is variStretch free?
Is FFT AUv3 Visualizer free?
Which has better reviews, variStretch or FFT AUv3 Visualizer?
Do variStretch or FFT AUv3 Visualizer have ads?
Which is updated more often, variStretch or FFT AUv3 Visualizer?
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