Harmonium vs Rotary Mod
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
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 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
Harmonium costs $0.99 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 3.0. 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.
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.
| Parameter | Harmonium | Rotary Mod |
|---|---|---|
| Price | $0.99 — better | $7.99 |
| Rating | 3.0 (3 ratings) | 4.3 (23 ratings) — better |
| Positive reviews | 38.8% of reviews | 80.0% of reviews — better |
| Number of ratings | 3 | 23 — better |
| Update frequency | Every 6 weeks — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 13 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | C.BARATAY | Eventide |
Customer experience
Harmonium
Rotary Mod
In-app purchases
Harmonium
No in-app purchases
Rotary Mod
No in-app purchases









