Undulator vs yaleD
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.
yaleD
This audio effect plugin creates a unique reverse delay sound. It offers detailed control over feedback, filtering, and timing, with options for synced beats or milliseconds. Ideal for musicians and producers seeking creative audio manipulation.
- Reverse delay audio effect
- AUv3 plugin extension
- Beat-synced or millisecond delay times
- Feedback with cross-pan and filtering
- Optional tape effect
- One-Shot mode for triggered records
- MIDI control and automation support
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yaleD is a dedicated reverse delay audio effect, with full support as an Audio Unit (AUv3) plugin extension. Please note that while it works as a standalone app, it is designed to be used from other host audio apps such as GarageBand, AUM, Audiobus 3, Cubasis, etc! A reverse delay effect continuously listens then plays back reversed chunks of the audio input depending on the delay time, feedback and filtering settings. Can be used for both obvious or subtle effects depending on the setup. Since a reverse delay is sensitive to positional sync as well as delay time, the reversals are appropriately synced to the host transport timeline when playing back and using the beat-based delay time. Or the Hold Time button can be used to both sync and set the delay time manually by pressing and releasing it at the appropriate time. - Complete control over input gain, and independent wet and dry output levels. - Feedback with cross-pan and both low-pass and high-pass filtering. - Two available repeat behaviors when using feedback: one keeps all repeats reversed, while the other alternates each repeat reversed then forwards. - Delay time specified either in milliseconds, or as beats (with 1/16th note resolution) synced to host tempo. You can also specify the maximum delay time (up to 20 seconds!) in the settings to control the per-instance memory usage. - Can apply a delay time scaling offset to the second channel for interesting stereo effects. - Optional Tape effect when changing delay time. - One-Shot mode for doing triggered records and single reverse playback. Great for playing a solo in and reversing just what you want to hear. The hold/record and replay buttons can be controlled with MIDI bindings. - All parameters are exposed to the AU host so that you can apply automation or MIDI bindings from the host - Easy to use resizable plugin interface optimized for host apps on both iPhones and iPads. Made for fingers!
Screenshots
Verdict
The clearest difference is rating: yaleD at 4.9 against Undulator's 4.3. yaleD also leads on update cadence (daily vs every 2 months) and price ($1.99 vs $7.99). 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 yaleD $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
yaleD holds the better App Store score, 4.9 against 4.3. Both are backed by a comparable volume of ratings — 11 and 24 respectively. Written reviews point the same way: 86% of Undulator's written reviews are positive against 100% of yaleD's.
Undulator ships an update every 2 months, yaleD daily. The most recent releases landed on October 7, 2026 and September 29, 2026 respectively.
| Parameter | Undulator | yaleD |
|---|---|---|
| Price | $7.99 | $1.99 — better |
| Rating | 4.3 (11 ratings) | 4.9 (24 ratings) — better |
| Positive reviews | 85.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 11 | 24 — better |
| Update frequency | Every 2 months | Daily — 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 | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Eventide | Sonosaurus LLC |
Customer experience
Undulator
yaleD
In-app purchases
Undulator
No in-app purchases
yaleD
No in-app purchases









