Undulator vs WoodScaper
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Undulator
This app offers a classic modulated tremolo effect inspired by a renowned hardware processor. It allows musicians to add rhythmic movement, ethereal feedback, and detuned echoes to various instruments and samples, creating evolving soundscapes and dynamic textures.
- Modulated tremolo effect
- Ethereal feedback and detuned echoes
- AM/FM modulation
- Tempo sync
- Real-time ribbon control
- Multiple modulation waveforms
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Undulator is Eventide’s classic modulated tremolo effect from the iconic H3000 effects processor. This unique, rhythmic effect combines ethereal feedback and detuned echos, run through an AM / FM modulated tremolo. Whether used for manipulating samples or adding movement to strings, pads, guitars, and keys, Undulator is a muse for creative musicians. Add Undulator into your plug-ins collection for the most playable tremolo-style effect on your DAW or iOS device. Undulator excels at evolving pads, sync’d chops, and time-lapsing dreamy soundscapes. Combined with a multi-tap delay and powerful tremolo, Undulator’s controls give any sound sustain and shape. This is perfect for transforming ordinary synths, keys, guitars, and even vocals into evolving pads, tempo synced production elements, or ethereal and fluctuant delays. Simply put, Undulator can make shorter sounds into longer layered effects, and give sustaining sounds shape and rhythmic character. Use the Ribbon to morph tremolo patterns into vacillating and varying rhythmic territories. This can be effective for calling attention to synth pads and creating a state of flux or rarity which is otherwise arduous to achieve. - Turn up the MIX to increase the dry/effect ratio. - Utilize multiple modulation waveform shapes and sources to alter the rhythmic feel. - Subtly finesse detuning of delays by using SPREAD. - Add FEEDBACK to accentuate delays or create infinite loops. - The Secondary LFO determines how fast the depth and speed modulation “wiggle” their targets. - Lock the tremolo to tempo using SYNC. - RETRIG at the top of the waveform for a more predictable effect. - RIBBON lets you ‘play’ the effect in real-time and provides dynamic and fluid control to morph back and forth between the settings of your choice. - SLOW/FAST button toggles on a “Slow LFO” mode. Holding it down to “BRAKE” temporarily slows down the LFOs at a constant rate until released. - Update the tremolo speed in real time using the TAP button. - Available as an AUv3 plug-in and Standalone App.
WoodScaper
This app offers a versatile suite of four classic guitar effects: phaser, chorus/flanger, wah-wah, and tremolo. It provides extensive customization options for each effect, allowing for complex sound design and routing possibilities. It functions as both a standalone application and an AUv3 effect.
- Four classic guitar effects: phaser, chorus/flanger, wah-wah, tremolo
- Advanced LFO modulation with multiple waveforms and sync options
- Flexible routing: series, parallel, and custom combinations
- Stereo output from mono input
- AUv3 and standalone operation
- MIDI control for major parameters and preset switching
- iCloud Drive preset storage
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WoodScaper combines into one unit the 4 classic guitar effects : phaser, chorus/flanger, wah-wah and tremelo. Besides the familiar controls each effect has some extra not-so-commonly-found options. The 4 effects can be routed in series (pedalboard mode), parallel (DAW mode) or some combinations of those modes. Panning or the Stereo control can create stereo sounds from a mono input source. WoodScaper is both stand-alone and an AUv3 effect. - All LFO’s can be set to different waveforms : Sine, Square, Saw Up, Saw Down, Triangle. - All LFO frequencies can be set to a bar fraction (1/4, 1/8 , …) of the BPM or can be set free to a specific rate (independent from the BPM). - All LFO phases can be reset with a button. - All effects have an On/Off (parallel routing) or On/Bypass (serial routing) switch like on a pedalboard. The switches can be toggled by Midi CC’s. - Phaser has settings for number of poles, frequency range and modulation flavour. - Phaser has second LFO to modulate filter Q. - Chorus has feedback, HighPass, LowPass and Saturation. - Wah-wah control can be LFO, Envelope, Envelope + LFO, side chain, Midi note velocity or Midi CC 1 (mod wheel). - Wah Envelope has Attack, Release and Threshold or Sensitivity controls. - Wah can go up or down. - Wah filter type and Q can be set. - Tremolo has 3 types : Amplitude, Ring or Harmonic. - Harmonic Tremolo has cross-over frequency control. - Tremolo has a Threshold control to have more tremolo when the signal increases. - Tremolo has “Biased Tremolo” mode to get more tremolo when the signal decreases. - Has a global Input and Output Gain control. - Has 2 extra LFO’s to modulate most parameters (rates, depths, …) - Modulation LFO’s have their own slew rate control and a random mode. - Presets can be stored in iCloud Drive (makes them available on all your devices). - Presets can be switched with Midi Program Changes or a Midi CC (up or down) - Major controls can be set with Midi CC messages.
Screenshots
Verdict
The clearest difference is rating: WoodScaper at 4.9 against Undulator's 4.3. WoodScaper also leads on update cadence (every 3 weeks vs every 2 months) and review sentiment (100% vs 86%). Undulator's advantage is price ($7.99 vs $9.99). On ratings volume, ads, in-app purchases and monetization model 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
Undulator costs $7.99 and WoodScaper $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
WoodScaper holds the better App Store score, 4.9 against 4.3. Both are backed by a comparable volume of ratings — 12 and 7 respectively. Written reviews point the same way: 86% of Undulator's written reviews are positive against 100% of WoodScaper's.
Undulator ships an update every 2 months, WoodScaper every 3 weeks. Both last shipped on November 3, 2026.
| Parameter | Undulator | WoodScaper |
|---|---|---|
| Price | $7.99 — better | $9.99 |
| Rating | 4.3 (12 ratings) | 4.9 (7 ratings) — better |
| Positive reviews | 85.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 12 — better | 7 |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 | 9.3 — better |
| Further details — not scored | ||
| Size | 16 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Eventide | Woodman's Immaculate Maple Syrup Studio |
Customer experience
Undulator
WoodScaper
In-app purchases
Undulator
No in-app purchases
WoodScaper
No in-app purchases









