SL950 vs variStretch
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SL950
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SL950 is a Sample Librarian for the AKAI S900 and S950 samplers. The application doesn't make any sound by itself and is designed to communicate with the hardware. The application needs a MIDI connection to the hardware to make changes. Please refer to the included manual to learn more. - Edit programs - Upload samples - Generate new programs by chopping samples Drum Machine Funk is not affiliated with AKAI and is an independent developer of innovative apps for your favorite samplers and synthesizers.
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
Screenshots
Verdict
The clearest difference is price: variStretch at $5.99 against SL950's $24.99. SL950's advantage is update cadence (every 4 days vs every 7 months). On ads, in-app purchases, device support and iOS requirement 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
SL950 costs $24.99 and variStretch $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SL950 ships an update every 4 days, variStretch every 7 months. The most recent releases landed on September 19, 2026 and September 30, 2026 respectively.
| Parameter | SL950 | variStretch |
|---|---|---|
| Price | $24.99 | $5.99 — better |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 4 days — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 24 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Delta Seven Kft. | Satoshi Kajii |
In-app purchases
SL950
No in-app purchases
variStretch
No in-app purchases
