RM vs AddStation
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RM
This audio effect app offers versatile modulation capabilities, including ring, amplitude, phase, and frequency modulation. It features a built-in carrier oscillator, multimode filter, envelope follower, and LFO for creating unique sounds. It can be used standalone or with other audio apps.
- Multiple modulation types (Ring, AM, FM, Phase)
- Built-in carrier oscillator
- Multimode filter (LP, HP, BP)
- Envelope follower and LFO
- Standalone and IAA/Audiobus support
- AUv3 plugin compatibility
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RM-1 Wave Modulator RM-1 is a multi purpose audio effect designed around various types of modulation. Featuring a built-in carrier oscillator, multimode filter, envelope follower and low frequency oscillator, RM-1 creates new sounds by combining carrier waveform and the audio input in different ways. Types of modulation: - Ring Modulation (virtual analog) - Ring Modulation (digital) - Amplitude Modulation - Phase Modulation (DX-style FM) - Frequency Modulation (linear) Overview: - Built-in carrier oscillator with variable wave-shape (sine->square) - Built-in multimode Filter (LP, HP, BP) - Built-in Envelope Follower and LFO Connectivity: - Standalone (MIC, USB audio) - IAA / Audiobus - AUv3 Plugin
AddStation
Explore new sonic territories with this advanced additive synthesis tool. Create complex timbres by combining thousands of sine waves and unique morph sequencing. Integrate seamlessly with iOS production environments and enjoy a suite of built-in effects.
- Fractal additive synthesis
- Sound morphing
- Over 170 sound presets
- AUv3 AudioUnit integration
- Built-in effects suite
- Audiobus 3 and Ableton Link support
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The next generation of additive synthesis Additive synthesis is a sound synthesis technique that creates timbre by adding sine waves together. The timbre of musical instruments can be considered to consist of multiple harmonic or inharmonic partials or overtones. VirSyn already has a remarkable track record of products ( CUBE, POSEIDON ) trying to make this virtually unlimited synthesis method manageable for creative sound designers and musicians. AddStation is the next step forward giving you a tool to explore completely new sonic territory. The massive amount of sine waves in AddStation - thousands per voice - together with unique morph sequencing blocks blur the frontiers between analog and digital sonic realms. And all this integrated in all relevant iOS production environments especially the emerging AUv3 AudioUnit standard. Synthesis • Fractal additive synthesis • over 170 sound presets • Four parts with 8 Additive Sequence Blocks • Sound morphing • up to 512 partials per voice with independent AD envelopes • harmonic/inharmonic spectra • Ringmodulation • arbitrary filter function and noise spectra • four independent analog style Arpeggiators Effects • Chorus • Phaser • Flanger • Overdrive • Parametric EQ • Echo/Delay • Reverb Global • AUv3 for Host integration • Audiobus 3 compatible (Input slot) with state saving • Support for Ableton Link. • Inter-app audio compatible (Instrument/Generator) • CoreMIDI / Virtual MIDI • Audio recorder.
Screenshots
Verdict
The clearest difference is update cadence: AddStation at weekly against RM's every 10 months. AddStation also leads on review sentiment (82% vs 67%) and device support (3 vs 1). RM's advantage is iOS requirement (9.0 vs 12.0). On rating, ratings volume, ads and in-app purchases 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
RM costs $9.99 and AddStation $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.6 for RM against 4.5 for AddStation. Both are backed by a comparable volume of ratings — 18 and 43 respectively. Written reviews are what separate them: 67% of RM's written reviews are positive against 82% of AddStation's.
RM ships an update every 10 months, AddStation weekly. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.
| Parameter | RM | AddStation |
|---|---|---|
| Price | $9.99 | $8.99 — better |
| Rating | 4.6 (18 ratings) — better | 4.5 (43 ratings) |
| Positive reviews | 66.7% of reviews | 82.1% of reviews — better |
| Number of ratings | 18 | 43 — better |
| Update frequency | Every 10 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 35 MB | 133 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Aras | Harry Gohs |
Customer experience
RM
AddStation
In-app purchases
RM
No in-app purchases
AddStation
No in-app purchases







