Comparison

Harmonium 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

Harmonium

This app provides a virtual harmonium with customizable tuning for both Indian and Western music styles. It offers two distinct sound flavors and features automatic transposition for playing in any key. Enjoy playing along with your own music library.

Highlights
  • Customizable tuning for Indian and Western scales
  • Two sound flavors: Traditional Harmonium & Modern Flute Organ
  • Automatic transposition for playing in any key
  • Adjustable tuning frequency (380 Hz - 470 Hz)
  • Play along with iPhone/iPad music library
  • Single or double reed options
Features
Read full description

Harmonium will enable you to play different styles of harmonium, perfectly in tune. If you're interested to play indian music (karnatac or hindusthani), this is the perfect "travel" harmonium you need. Tune your harmonium such as the great singer masters where doing, in the indian harmonic scale. You select harmonic scale, and the base note. That's it. If you prefer to play western music, religious music, then tune the harmonium to the common tempered scale. You'll have a big church harmonium in your pocket! Our harmonium can do automatic transposition. You can play in any key with the same keyboard position. You just need to select the note to play on the C key of the keyboard. Harmonium contains two sound flavours : - Traditional Harmonium, with deep sound of original reeds - Modern flute organ, simpler, heavenly Each sound flavour has a simple set of reeds, or double (with octave). The harmonium can be tuned between A 380 Hz and 470 Hz. An option enables harmonium to play while your iPhone / iPad is playing music. This is very convenient for training yourself to accompagny your prefered artists! Play karaoke with your harmonium! For getting the best sound from this instrument, it is advised to use a good headphone or a pair of speakers with loudspeaker. We should distinguish Harmonium from Shruti (or sruti). Actually, the harmonium is a melody instrument and is usually used to follow the melody played by the soloist (sitar, bansuri, vocal, tabla, ...). The Shruti is only used to play continuously a set of notes (drone) for create the musical atmosphere.

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

Harmonium3 screens
Rotary Mod3 screens

Verdict

The call

The clearest difference is rating: Rotary Mod at 4.3 against Harmonium's 3.0. Rotary Mod also leads on review sentiment (80% vs 39%) and ratings volume (23 vs 3). Harmonium's advantage is price ($0.99 vs $7.99) and update cadence (every 6 weeks vs every 3 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

CostPrice · In-app purchases · Ads · Monetization

Harmonium costs $0.99 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 3.0. That said, the two scores are not equally well evidenced: Rotary Mod has 23 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 39% of Harmonium's written reviews are positive against 80% of Rotary Mod's.

UpkeepUpdate frequency

Harmonium ships an update every 6 weeks, Rotary Mod every 3 months. The most recent releases landed on October 15, 2026 and October 14, 2026 respectively.

Scorecard6 real differences · 4 level
Harmonium versus Rotary Mod: the parameters behind the verdict, then further details
ParameterHarmoniumRotary Mod
Price$0.99 — better$7.99
Rating3.0 (3 ratings)4.3 (23 ratings) — better
Positive reviews38.8% of reviews80.0% of reviews — better
Number of ratings323 — better
Update frequencyEvery 6 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.011.0 — better
Further details — not scored
Size13 MB24 MB
Age rating4+4+
DeveloperC.BARATAYEventide

Customer experience

Harmonium

All ratings3 ratings
Positive33.3%
Neutral33.3%
Negative33.3%
Written reviews98 reviews
Positive38.8%
Neutral3.1%
Negative58.2%

Rotary Mod

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

In-app purchases

None

Harmonium

No in-app purchases

None

Rotary Mod

No in-app purchases

Questions

Is Harmonium free?
Harmonium costs $0.99, with no in-app purchases.
Is Rotary Mod free?
Rotary Mod costs $7.99, with no in-app purchases.
Which has better reviews, Harmonium or Rotary Mod?
Rotary Mod is rated higher. Harmonium averages 3.0 out of 5 from 3 ratings, while Rotary Mod averages 4.3 from 23 ratings.
Do Harmonium or Rotary Mod have ads?
Neither Harmonium nor Rotary Mod shows ads.
Which is updated more often, Harmonium or Rotary Mod?
Harmonium ships an update every 6 weeks, and Rotary Mod every 3 months. Most recently, Harmonium was updated on October 15, 2026 and Rotary Mod on October 14, 2026.

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