Comparison

Undulator vs BLEASS Dragonfly

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

Head to head
About

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.

Highlights
  • Modulated tremolo effect
  • Ethereal feedback and detuned echoes
  • AM/FM modulation
  • Tempo sync
  • Real-time ribbon control
  • Multiple modulation waveforms
Read full description

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.

About

BLEASS Dragonfly

This audio effect plugin offers a unique approach to tremolo, allowing music producers to add dynamic modulation to synths, vocals, and melodies. It syncs tremolo effects with input frequencies, MIDI notes, or sidechained signals for creative sonic textures.

Highlights
  • Pitch tracking for self or sidechain modes
  • MIDI input for precise triggering
  • Manual rate and amplitude control
  • Adjustable smoothing, stereo, attack, and release
  • Wild mode for saturation and waveshaping
  • Animated visualization of effect rate
Read full description

BLEASS Dragonfly is a completely new approach to tremolo effect which brings new sonic possibilities to all music producers. Make your synths, voices or any melody “vibrate” in correspondence with its own frequencies, or with external basses and leads! Just like in Billie Eilish’s song “Xanny”, Dragonfly helps you achieve the same effect as when the voice gets modulated by a heavy bass. BLEASS Dragonfly automatically syncs the tremolo effect applied on a track using various triggers: First, you can use the pitch tracking module on either the input audio track (“self mode”) or a sidechained audio track (“sidechain mode”). You also can use the midi input to trigger Dragonfly with accuracy: the tremolo will automatically sync with the notes’ frequencies. Finally, a manual mode allows you to set a fixed frequency. Then you can finetune your settings by adjusting the fine, factor, smoothness, stereo, attack & release. The “Wild” mode applies a waveshaper to the signal to produce a subtle saturation. The final tremolo effect rate is mirrored by the flapping wings of the Dragonfly. BLEASS Dragonfly is also available for Mac & Windows (AU / VST3) https://www.bleass.com/dragonfly/ ________________________________________________ Technical description: SOURCE stage: - MANUAL: Tremolo rate is set by the Rate knob. Tremolo amplitude is set by the Amplitude knob. - MIDI: Tremolo rate corresponds to the rate of the lowest MIDI note received by the plugin. Tremolo amplitude corresponds to the velocity value of this note. - SELF: Pitch tracking on the input signal gives the tremolo rate. Tremolo amplitude matches the input signal’s amplitude. - SIDECHAIN: Pitch tracking on the sidechain signal gives the tremolo rate. Tremolo amplitude matches the sidechain signal’s amplitude. - SOURCE CHANNEL: Sets the channel to be analysed for SELF and SIDECHAIN modes. - AMPLITUDE: Sets tremolo amplitude in MANUAL mode. - GAIN: Sets the input gain in MIDI, SELF and SIDECHAIN modes. DRAGONFLY stage: - RATE: Sets tremolo rate in MANUAL mode. - FINE: Offsets the detected pitch value by +/- 0.5 semitone in MIDI, SELF and SIDECHAIN mode. - FACTOR: Detected or set rate is multiplied by this factor to give the final tremolo rate. - SMOOTH: Sets the smoothing duration of rate variations. - STEREO: Sets phase difference between left and right channels. - ATTACK: Attack duration of the effect. - RELEASE: Release duration of the effect. - MODE: SIMPLE is a basic tremolo. WILD uses complex waveshaping for warm and saturated effect. - WILDNESS: Sets waveshaping strength in WILD mode. - VISUALISATION: Dragonfly wings are animated to match the rate and amplitude of the effect. Green label on the left indicates the input MIDI note and rate. Blue label on the right indicates the applied MIDI note and Rate. MIX stage: - GAIN: Output gain of the effect. - DRY/WET: Dry/wet balance. NOTE: This is an AUv3 effect which needs a compatible host that ideally offers audio sidechain or MIDI FX routing (such as AUM, Cubasis 3 or Logic)

Screenshots

Undulator3 screens
BLEASS Dragonfly4 screens

Verdict

The call

The clearest difference is rating: BLEASS Dragonfly at 4.8 against Undulator's 4.3. BLEASS Dragonfly also leads on review sentiment (100% vs 86%). Undulator's advantage is update cadence (every 2 months vs every 24 months). On price, 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

Undulator costs $7.99 and BLEASS Dragonfly $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

BLEASS Dragonfly holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 11 and 17 respectively. Written reviews point the same way: 86% of Undulator's written reviews are positive against 100% of BLEASS Dragonfly's.

UpkeepUpdate frequency

Undulator ships an update every 2 months, BLEASS Dragonfly every 24 months. The most recent releases landed on October 14, 2026 and October 18, 2026 respectively.

Scorecard3 real differences · 7 level
Undulator versus BLEASS Dragonfly: the parameters behind the verdict, then further details
ParameterUndulatorBLEASS Dragonfly
Price$7.99$7.99
Rating4.3 (11 ratings)4.8 (17 ratings) — better
Positive reviews85.7% of reviews100.0% of reviews — better
Number of ratings1117 — better
Update frequencyEvery 2 months — betterEvery 24 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better12.0
Further details — not scored
Size16 MB27 MB
Age rating4+4+
DeveloperEventideBLEASS

Customer experience

Undulator

All ratings11 ratings
Positive81.8%
Neutral0.0%
Negative18.2%
Written reviews7 reviews
Positive85.7%
Neutral0.0%
Negative14.3%

BLEASS Dragonfly

All ratings17 ratings
Positive88.2%
Neutral11.8%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Undulator

No in-app purchases

None

BLEASS Dragonfly

No in-app purchases

Questions

Is Undulator free?
Undulator costs $7.99, with no in-app purchases.
Is BLEASS Dragonfly free?
BLEASS Dragonfly costs $7.99, with no in-app purchases.
Which has better reviews, Undulator or BLEASS Dragonfly?
BLEASS Dragonfly is rated higher. Undulator averages 4.3 out of 5 from 11 ratings, while BLEASS Dragonfly averages 4.8 from 17 ratings.
Do Undulator or BLEASS Dragonfly have ads?
Neither Undulator nor BLEASS Dragonfly shows ads.
Which is updated more often, Undulator or BLEASS Dragonfly?
Undulator ships an update every 2 months, and BLEASS Dragonfly every 24 months. Most recently, Undulator was updated on October 14, 2026 and BLEASS Dragonfly on October 18, 2026.

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