Modulin vs Zynth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Modulin
This app is a highly customizable analog modeling synthesizer designed for personal expression. It offers a wide range of visual feedback, sound modulation options, and built-in effects. Users can create, record, and share their musical creations.
- Customizable analog modeling synthesizer
- LFO with four wave types
- Low-pass filter and glide effect
- Built-in reverb, delay, and chorus
- Multi-track recording and playback
- Synthesis exploration area
- MIDI CC mapping
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Modulin is the world's most customizable synthesizer. It allows for unique personal expression while providing a wide spectrum of visual feedback. The playful colored strings are visually appealing while providing the user with fluent modulation of Modulin's LFO. The LFO replicates the vibrato effect heard throughout an orchestra or choir. The LFO can be set to four different wave types: Sinuous, Triangle, Sawtooth, and Square. It also can be set to a wide variety of frequency ranges. Modulin's oscillator can also be set to these four waveforms, but its pitch is controlled by the strings and a tuning knob. A simple low-pass filter allows you to cut off the unnecessary frequencies. The glide rate knob on Modulin creates a fluent portamento effect and allows for some pretty cool instrument replications. A slider located in the middle of the effects view can be dragged to reveal different effects and extra sound makers. Modulin includes reverb, delay, and chorus. It also contains a separate white noise module. Modulin simulates paraphonicness by allowing for a second VCO multiplied to form a gap of up to 2 octaves. Below all the knobs, an ADSR control allows you to manipulate the attack, decay, sustain, and release of your sounds. Modulin truly is the complete package for channeling your inner-composer. It can even record and store your works of art. A record button allows you to lay down a beat and overwrite it with complex melodies. The tracks button allows you to manage your tracks as you add them. New to synthesis? No problem. Modulin has an explore section that takes you through every component in an analog synthesizer, describing what it does alongside a diagram of how signals flow through it. Master of all things musical? Modulin's got you covered again. You can change the root note, octave, and type of scale that Modulin uses. If you feel really confident, you could even turn off the note names in the settings and try to memorize where everything is. With over 40 presets and other preset packages to buy, you will never run out of new and unique sounds. Even if you do, you can create your own and save it for later or share it with friends by the swipe of your finger. Fat fingers? Don't worry. With Modulin’s design, you can plug in an external MIDI keyboard and play it however you like. You can even map certain knobs on Modulin to knobs on your keyboard. It's magic! The more you explore Modulin, the more fun it becomes. You can personalize it by adding your own custom color or amp up the expression through the pressure sensitivity setting. FEATURES ・Comes with over 40 presets (More available through Modulin’s store) ・Easily share presets and recordings with friends ・MIDI CC mapping ・Amazing digital synth sounds ・Multi track recordings ・Synthesis exploration area ・22 Scales (With the ability to add your own) ・Save custom presets ・Favoritize presets for quick and easy access ・Built-in metronome for playing in time ・Customizable color ・Toggling of note labels ・Fun flexible strings and an oscilloscope in the upper corner give a great level of feedback ・Effortless and intuitive design SUPPORTS ・All 64-bit iOS devices ・External MIDI controllers ・Bluetooth MIDI controller ・Audiobus and Inter-App Audio ・Share custom preset files over AirDrop, Mail, or other 3rd party applications ・3D Touch LFO Modulation ・Drag and Drop for Presets
Zynth
This app transforms your device into an expressive electronic instrument. Create unique soundscapes using touch, tilt, and motion with an intuitive interface. It offers multiple waveforms, built-in effects, and dynamic visualizations.
- Gesture-based sound control
- Multiple waveforms (sine, square, triangle, sawtooth)
- Built-in audio effects (echo, pitch, modulation)
- Dynamic visualization
- Customizable themes
- Beginner-friendly and advanced options
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Transform your device into an expressive electronic instrument that responds to touch, tilt, and motion. Create hypnotic soundscapes with an intuitive interface inspired by the theremin and modern synthesis techniques. Features: - Gesture-based sound control with responsive visual feedback - Multiple waveforms: sine, square, triangle, and sawtooth - Built-in audio effects including echo, pitch, and modulation - Dynamic visualization that moves with your music - Dark and light themes with customizable color palettes - Simple enough for beginners, deep enough for experienced musicians - Create and perform anywhere - no external equipment needed Perfect for: - Musicians seeking a new creative tool - Sound designers and experimenters - Visual artists exploring audio - Anyone interested in music creation Download now and start your sonic journey! This app was my submission to the Swift Student Challenge 2025.
Screenshots
Verdict
The clearest difference is review sentiment: Modulin at 69% against Zynth's 0%. Modulin also leads on iOS requirement (10.0 vs 17.3). Zynth's advantage is in-app purchases (none vs 1). On price, ads and device support 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
Both are free to download. Modulin sells 1 one-off in-app purchase. Zynth asks for nothing beyond the download.
| Parameter | Modulin | Zynth |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (17 ratings) — better | — |
| Positive reviews | 69.2% of reviews — better | 0.0% of reviews |
| Number of ratings | 17 — better | — |
| Update frequency | Every 5 days | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.0 — better | 17.3 |
| Further details — not scored | ||
| Size | 29 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Grant Emerson | Philipp Ollmann |
Customer experience
Modulin
Zynth
In-app purchases
Modulin
- PhilharmodulinFree
Zynth
No in-app purchases









