Stellr vs Rotary Mod
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stellr
Create deep, ethereal ambiance with a pitch-shifter, dual delays, and reverb. Explore sonic possibilities with 15 presets, randomization, and parameter automation. Enhance your music with a new dimension of sound.
- Pitch shifter with fine-tuning or semitone snap
- Two independent delays for complex feedback
- LFO modulation and various reverb types
- Pre-gain and dry/wet level control
- Audio Unit Extension, Audiobus, Inter-App Audio support
- 15 built-in presets with import/export
- Realtime frequency spectrum visualizer
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Stellr is a pitch-shifter/delay/reverb sound processor aimed to recreate the classic shimmer effect. It makes deep ethereal ambiance on top of your sound, providing you with a wide variety of sonic possibilities. Add a new dimension to your music. The effect features 20 ready to use presets which can be shared between devices as well as randomize button for endless variations. When loaded as Audio Unit effect, all parameters can be automated via host app. Stellr main features: – Pitch shifter which can be fine-tuned or snapped to semitone – Two separate delays for creating a complex feedback effect – LFO modulation and different types of reverb – Set pre-gain and dry/wet levels – Audio Unit Extension support – 20 built-in presets – Low-pass and High-pass filters – Ability to save and randomize parameters – Import and export of user presets – Realtime frequency spectrum visualizer
Rotary Mod
This app emulates a Leslie speaker, creating a pulsing vibrato effect for instruments and vocals. It offers precise control over rotor and horn speeds, cabinet size, and includes advanced features like frequency modulation and a unique Ribbon control for simultaneous parameter adjustments.
- Independent rotor and horn speed control
- Frequency modulation with secondary LFO
- Selectable cabinet size (Standard/Giant)
- Hicut control for tone shaping
- Tap Tempo for BPM sync
- Innovative Ribbon control
- Mix Lock for preset scrolling
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Rotary is a rotating cabinet effect that simulates a Leslie speaker. It produces a pulse-like vibrato effect depending on the speed of rotation. Rotary offers precise control to dial in the exact amount of movement you need. This classic, swirly effect has been used on countless hit records to drastically transform guitars, bass, synths and even vocals. Features: - Change the speed of the rotor and horn independently and adjust the mix of the two to produce pulsing effects and special vibratos. - Add frequency modulation to the rotor and horn speed using secondary LFO with selectable modulation source. - Choose cabinet size (Standard or Giant) to alter the sweetness of your tone. - Craft the exact sound you need with included Hicut control. - Use Tap Tempo to sync effect to the BPM of your song. - Incredibly easy to use with included presets. - Innovative Ribbon control allows for changing any combination of parameters simultaneously. - Use Mix Lock to scroll through presets while keeping the wet-dry mix constant. - Available as an Audio Units AUv3 plug-in and Standalone app.
Screenshots
Verdict
The clearest difference is rating: Rotary Mod at 4.3 against Stellr's 3.4. Rotary Mod also leads on update cadence (every 3 months vs every 40 months) and review sentiment (80% vs 67%). Stellr's advantage is price ($4.99 vs $7.99). On ratings volume, ads, in-app purchases and monetization model 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
Stellr costs $4.99 and Rotary Mod $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Rotary Mod holds the better App Store score, 4.3 against 3.4. Both are backed by a comparable volume of ratings — 9 and 23 respectively. Written reviews point the same way: 67% of Stellr's written reviews are positive against 80% of Rotary Mod's.
Stellr ships an update every 40 months, Rotary Mod every 3 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | Stellr | Rotary Mod |
|---|---|---|
| Price | $4.99 — better | $7.99 |
| Rating | 3.4 (9 ratings) | 4.3 (23 ratings) — better |
| Positive reviews | 66.7% of reviews | 80.0% of reviews — better |
| Number of ratings | 9 | 23 — better |
| Update frequency | Every 40 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 26 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | BACKPULLVER SOFTWARE LTD OOD | Eventide |
Customer experience
Stellr
Rotary Mod
In-app purchases
Stellr
No in-app purchases
Rotary Mod
No in-app purchases








