Comparison

FAC Gravity vs BLEASS Spectral Reverb

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

Head to head
About

FAC Gravity

Create unique audio effects like Barberpole glissandos, spectral illusions, and evolving echoes. This frequency shifter offers stereo or mono processing with customizable feedback loops and modulation for dynamic sound design.

Highlights
  • Barberpole glissandos and spectral illusions
  • Stereo or mono frequency shifting
  • Spiral feedback loop with delay and filtering
  • Modulation matrix with LFO and envelope follower
  • Tempo-synced or MIDI-driven effects
  • Dry/wet mix and optional limiting
Features
Read full description

FAC Gravity AUv3 Plugin is a frequency shifter for creating Barberpole and Shepard style glissandos, spectral illusions, stereo rotation, chorusing, phasing, evolving echoes, infinite cosmic spaces, and all the combinations you’ll make. The plugin gives you two ways to process the audio source. In Stereo mode, each channel is shifted independently, with a Ratio control determining how closely their frequency shifts align. In Mono mode, FAC Gravity extends the internal quadrature processing to create a wide stereo image from the mono source. The frequency shift can move up or down, from subtle to more extreme spectral transformations. You can set the amount in Hz for classic Bode-style frequency shifting, make it follow your host tempo for rhythmic patterns, or even control it from MIDI notes for a more hands-on approach. A new dimension appears when you let the shifter feed back into itself with Spiral, a customizable loop with delay, blur, filtering, and different characters that shape how the sound circles, smears, interacts, and evolves over time. The result can range from bubbling textures to infinite sustained tones and noisy analog self-oscillation. Each character takes the feedback somewhere different. To dive deeper into new sonic dimensions, FAC Gravity comes with its own modulation module. The LFO, envelope follower, and flexible modulation matrix let you animate most parameters, from subtle evolving movements to complex, rhythmically reactive changes. You can even make the stereo field animate and rotate continuously by making the Width, Phase, and Pan parameters spin! You can shape the effect further by blending the processed signal with the original, while the optional limiter keeps the most extreme combinations in check. • Barberpole glissandos, spectral illusions, rotating stereo, evolving echoes • Dual Frequency Shifting, or Mono Shifting with Quadrature Stereo Widening • Organic Spiral Loop, from gentle feedback to pure analog self-oscillation • Integrated delay, diffusion blur, and independent low/high filtering • Modulation matrix, multi-source envelope follower • LFO with classic waveforms and random spline • Spinning modulation to rotate and animate the stereo field • Tempo-synced or MIDI-driven Frequency Shift, LFO, and Delay • Dry/Wet mix, optional limiting, and goniometer visualization • Advanced Responsive Design, portrait and landscape views • Universal Purchase: AUv3 for iOS (iPad/iPhone), macOS and Vision Pro The documentation is available at fredantoncorvest.com/FAC_Gravity.html This is an AUv3 Effect and requires a compatible host to work The in-app purchases are for tipping only, the app is fully functional without them

About

BLEASS Spectral Reverb

Shape ambient soundscapes with precise spectral control. Independently adjust frequency regions to create expansive spaces or glitchy textures. Integrate with other effects for advanced sound design.

Highlights
  • Spectral Maps for frequency-dependent control
  • Frequency-dependent Attack, Decay, and Width
  • Freeze and Kill for tail control
  • Configurable spectral engine parameters
  • Four processing slots for spectral effects
  • External sidechain support
Read full description

BLEASS Spectral Reverb is an effect and sound design tool that gives you precise control over how ambience evolves across the frequency spectrum. Its intuitive Spectral Maps let you shape different frequency regions independently, creating anything from smooth, expansive spaces to fragmented and glitchy textures. Attack, Decay and Width each come with their own frequency-dependent Spectral Map, extending the core reverb far beyond conventional controls. Freeze and Kill bring instant control over evolving tails, while Block Size, Hop Factor and Smooth Size let the spectral engine move from clean and precise to rough, fragmented and characterful. Four processing slots can host any of six dedicated spectral effects: Spectral Gate, Harmony Follow, Spectral Ducker, Spectral Enhancer, Pitch Shifter and Frequency Shifter. Shape, enhance, duck or shift selected parts of the spectrum, with external sidechain support for even more responsive processing. Explore spacious, polished, abrupt, fragmented and harmonic reverbs with the depth and immediacy of BLEASS Spectral Reverb. BLEASS Spectral Reverb is available as an AUv3 plugin or a standalone app. BLEASS Spectral Reverb is also available on Windows, macOS, and Linux. More information, technical specifications and tutorials available on https://www.bleass.com/spectral-reverb

Screenshots

FAC Gravity4 screens
BLEASS Spectral Reverb3 screens

Verdict

The call

The clearest difference is in-app purchases: BLEASS Spectral Reverb at none against FAC Gravity's 3. BLEASS Spectral Reverb also leads on iOS requirement (15.0 vs 17.0). FAC Gravity's advantage is price ($9.99 vs $12.99) and ratings volume (6 vs 2). On rating, ads, monetization model 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

FAC Gravity costs $9.99 and BLEASS Spectral Reverb $12.99 up front. FAC Gravity sells 3 one-off in-app purchases. BLEASS Spectral Reverb asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

BLEASS Spectral Reverb holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 6 and 2 respectively.

Scorecard4 real differences · 4 level
FAC Gravity versus BLEASS Spectral Reverb: the parameters behind the verdict, then further details
ParameterFAC GravityBLEASS Spectral Reverb
Price$9.99 — better$12.99
Rating4.8 (6 ratings)5.0 (2 ratings) — better
Number of ratings6 — better2
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS17.015.0 — better
Further details — not scored
Size4 MB14 MB
Age rating4+4+
DeveloperFrederic CorvestBLEASS

In-app purchases

3 purchases

FAC Gravity

One-time3
  • Small Tip$1.99
  • Medium Tip$4.99
  • Large Tip$14.99
None

BLEASS Spectral Reverb

No in-app purchases

Questions

Is FAC Gravity free?
FAC Gravity costs $9.99, and also offers in-app purchases.
Is BLEASS Spectral Reverb free?
BLEASS Spectral Reverb costs $12.99, with no in-app purchases.
Which has better reviews, FAC Gravity or BLEASS Spectral Reverb?
BLEASS Spectral Reverb is rated higher. FAC Gravity averages 4.8 out of 5 from 6 ratings, while BLEASS Spectral Reverb averages 5.0 from 2 ratings.
Do FAC Gravity or BLEASS Spectral Reverb have ads?
Neither FAC Gravity nor BLEASS Spectral Reverb shows ads.

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