Comparison

Stellr vs Rotary Mod

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

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.

Highlights
  • 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
Read full description

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

Stellr2 screens
Rotary Mod3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Stellr costs $4.99 and Rotary Mod $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Stellr versus Rotary Mod: the parameters behind the verdict, then further details
ParameterStellrRotary Mod
Price$4.99 — better$7.99
Rating3.4 (9 ratings)4.3 (23 ratings) — better
Positive reviews66.7% of reviews80.0% of reviews — better
Number of ratings923 — better
Update frequencyEvery 40 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.011.0 — better
Further details — not scored
Size26 MB24 MB
Age rating4+4+
DeveloperBACKPULLVER SOFTWARE LTD OODEventide

Customer experience

Stellr

All ratings9 ratings
Positive55.6%
Neutral11.1%
Negative33.3%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Rotary Mod

All ratings23 ratings
Positive82.6%
Neutral4.3%
Negative13.0%
Written reviews10 reviews
Positive80.0%
Neutral10.0%
Negative10.0%

In-app purchases

None

Stellr

No in-app purchases

None

Rotary Mod

No in-app purchases

Questions

Is Stellr free?
Stellr costs $4.99, with no in-app purchases.
Is Rotary Mod free?
Rotary Mod costs $7.99, with no in-app purchases.
Which has better reviews, Stellr or Rotary Mod?
Rotary Mod is rated higher. Stellr averages 3.4 out of 5 from 9 ratings, while Rotary Mod averages 4.3 from 23 ratings.
Do Stellr or Rotary Mod have ads?
Neither Stellr nor Rotary Mod shows ads.
Which is updated more often, Stellr or Rotary Mod?
Stellr ships an update every 40 months, and Rotary Mod every 3 months. Most recently, Stellr was updated on November 2, 2026 and Rotary Mod on November 3, 2026.

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