Comparison

BLEASS Phaser vs Ulzii Drone

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

Head to head
About

BLEASS Phaser

This versatile audio effect plugin injects unique character into guitar, keyboard, vocal, and bass sounds. It offers a wide range of phasing effects, from subtle movement to atmospheric soundscapes, with an intuitive visual interface.

Highlights
  • Versatile phasing effect
  • Subtle movement to atmospheric soundscapes
  • Intuitive visualizer
  • Two LFO modulation sources
  • Tactile interface design
Read full description

More subtle than flanging and more colourful than chorus, phasing has long been a go-to effect for guitarists, keyboardists, vocalists and bassists who want to inject a touch of other-worldly character into their sound. No effects collection is complete without a phaser! BLEASS Phaser delivers a comprehensive and highly versatile phasing effect. Whether you’re looking for gentle movement, resonant swirls, or stunning atmospheric soundscapes, BLEASS Phaser can do it all. The plugin’s interface is dominated by a colourful and captivating visualisation that illustrates the notch frequencies that create the phasing effect. This detailed and intuitive display, coupled with BLEASS’ trademark tactile interface design, demystifies the entire phasing process, and makes working with BLEASS Phaser a joy. Phasers use all-pass filters to create frequency-specific phase changes within a sound. When this sound is overlaid on the original unprocessed sound, it creates notch filters at the cutoff frequencies of the all-pass filters. By using multiple all-pass filters, with frequencies that spread from a “centre” frequency determined by the first all-pass filter, a complex comb filtering effect is generated. Adding modulation to the filter frequencies leads to the characteristic sweeping, whooshing sound that phasing is known for. BLEASS Phaser has two LFO modulation sources. The first modulates the notch filter cutoff frequencies, the second modulates the spread of notch frequencies around the initial centre frequency. This allows the plugin to create classic repetitive phasing effects, as well as complex, ever-shifting notch patterns that add tons of sonic interest to a part. With BLEASS Phaser in your collection, you will never need another phaser! More information on bleass.com/phaser

About

Ulzii Drone

Read full description

Ulzii is an instrument for fingertip meditation, inspired by Mongolian throat-singing (khoomei) and the tradition of drone music. At its core is continuous tuning, free from the twelve equal-tempered Western scale. Two ribbons let you freely set the pitch of two voices; touching the central pad shapes the color of that voice's resonance (like a vowel) depending on where you touch. The name "Ulzii" comes from the endless knot found in traditional Mongolian ornamentation — echoing this app's core idea of an unbroken, continuous drone. - Continuous tuning ribbons: note names are just reference points — slide your finger to tune freely to anything in between - Central pad: touch position shapes vocal resonance (overtone color); an optional VOWELS overlay shows common vowel positions - Three playing modes: UNISON (locked to voice I), FOLLOW (a delayed echo of voice I), and ORBIT (an autonomous, ever-moving layer) - Sleep / meditation timer: 3–30 minutes, gently fading out at a slower tempo — ideal for bedtime or meditation Headphones are recommended. This app does not collect or transmit any personal data or performance data.

Screenshots

BLEASS Phaser3 screens
Ulzii Drone4 screens

Verdict

The call

The clearest difference is update cadence: Ulzii Drone at daily against BLEASS Phaser's every 21 months. Ulzii Drone also leads on price ($1.99 vs $6.99). BLEASS Phaser's advantage is iOS requirement (11.0 vs 17.0). On ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

BLEASS Phaser costs $6.99 and Ulzii Drone $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

BLEASS Phaser ships an update every 21 months, Ulzii Drone daily. Both last shipped on October 24, 2026.

Scorecard3 real differences · 7 level
BLEASS Phaser versus Ulzii Drone: the parameters behind the verdict, then further details
ParameterBLEASS PhaserUlzii Drone
Price$6.99$1.99 — better
Rating5.0 (11 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings11 — better—
Update frequencyEvery 21 monthsDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better17.0
Further details — not scored
Size27 MB5 MB
Age rating4+4+
DeveloperBLEASSKeisuke Oki

In-app purchases

None

BLEASS Phaser

No in-app purchases

None

Ulzii Drone

No in-app purchases

Questions

Is BLEASS Phaser free?
BLEASS Phaser costs $6.99, with no in-app purchases.
Is Ulzii Drone free?
Ulzii Drone costs $1.99, with no in-app purchases.
Do BLEASS Phaser or Ulzii Drone have ads?
Neither BLEASS Phaser nor Ulzii Drone shows ads.
Which is updated more often, BLEASS Phaser or Ulzii Drone?
BLEASS Phaser ships an update every 21 months, and Ulzii Drone daily. Most recently, BLEASS Phaser was updated on October 24, 2026 and Ulzii Drone on October 24, 2026.

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