Comparison

RM vs AddStation

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

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.

Highlights
  • Fractal additive synthesis
  • Sound morphing
  • Over 170 sound presets
  • AUv3 AudioUnit integration
  • Built-in effects suite
  • Audiobus 3 and Ableton Link support
Features
Read full description

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

AddStation4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

RM costs $9.99 and AddStation $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

RM ships an update every 10 months, AddStation weekly. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.

Scorecard5 real differences · 5 level
RM versus AddStation: the parameters behind the verdict, then further details
ParameterRMAddStation
Price$9.99$8.99 — better
Rating4.6 (18 ratings) — better4.5 (43 ratings)
Positive reviews66.7% of reviews82.1% of reviews — better
Number of ratings1843 — better
Update frequencyEvery 10 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS9.0 — better12.0
Further details — not scored
Size35 MB133 MB
Age rating4+4+
DeveloperKai ArasHarry Gohs

Customer experience

RM

All ratings18 ratings
Positive94.4%
Neutral0.0%
Negative5.6%
Written reviews6 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

AddStation

All ratings43 ratings
Positive88.4%
Neutral4.7%
Negative7.0%
Written reviews39 reviews
Positive82.1%
Neutral2.6%
Negative15.4%

In-app purchases

None

RM

No in-app purchases

None

AddStation

No in-app purchases

Questions

Is RM free?
RM costs $9.99, with no in-app purchases.
Is AddStation free?
AddStation costs $8.99, with no in-app purchases.
Which has better reviews, RM or AddStation?
RM is rated higher. RM averages 4.6 out of 5 from 18 ratings, while AddStation averages 4.5 from 43 ratings.
Do RM or AddStation have ads?
Neither RM nor AddStation shows ads.
Which is updated more often, RM or AddStation?
RM ships an update every 10 months, and AddStation weekly. Most recently, RM was updated on October 6, 2026 and AddStation on October 9, 2026.

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