Comparison

FAC Phazer vs Devil Spring Reverb

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

Head to head
About

FAC Phazer

This music effect plugin offers a rich sonic palette inspired by classic guitar pedals and hardware synthesizers. It provides extensive control over phasing effects with adjustable LFOs, unique characters, and versatile modulation options for all instruments and genres.

Highlights
  • Inspired by classic phaser units
  • Adjustable LFO with tempo sync
  • Four unique sonic characters
  • External modulation and Step mode
  • Stereo phase modulation
  • Universal AUv3 purchase
Features
Read full description

• Inspired by famous phaser units from guitarist and keyboardist world • Unique sonic character combined with a large amount of control • Adjustable LFO; diverse waveforms and synchronizable to host tempo • Versatile: External modulation (parameters), Step mode, and more • Unique Butterfly Meter: Shows LFO modulation and output level • Suitable for all musical genres and instruments • Stereo, adjustable phase modulation distance between both channels • Includes various presets for inspiration • Advanced Responsive Design, portrait and landscape views • Universal Purchase: AUv3 for iOS (iPad/iPhone), macOS and Vision Pro FAC Phazer will satisfy most fans of phasing effects, seducing them with its rich sonic palette and elegant interface. To achieve the classic phase effect, the original signal is blended with a slightly out-of-phase copy of itself. Altering the timing difference between the two signals produces the swooshing sound characteristic of phasing. Most phaser units available on the market are built around this circuit topology, each with its own specificities and limitations. Guitar pedals provide a great sonic signature out of the box and are a great source of inspiration, but we often overlook the impressive built-in effects sections of some hardware synthesizers. FAC Phazer combines the best of both worlds into a single plugin, offering access to all parameters involved in crafting the phasing effect. The design and development were inspired by both pedals and built-in phaser effects found in hardware synthesizers. This led to the creation of four unique characters: Classic, Midori, Step, and Tirus. All parameters can be applied to each of these characters, allowing you to create new, exciting, and outstanding sounds. The presets Slow, Moderate, and Jumpy Phase Pedal or also Fleur d’Oranger bring the classic pedals sound signature within your reach. If you're seeking more modern characteristics, the Step Sound I preset offers a splendid stepping mode, while the Midori Phase Shift II preset emphasizes the feedback in a unique way. On the other hand, the Tirus Anthem preset is an excellent starting point for exploring phasing effects produced with built-in synthesizer effects. An important aspect that strongly contributes to the variety of the sonic palette provided by the plugin is the modulation options. The LFO can run in free mode, be synchronized to the host tempo, or be defined by external automation parameters. The documentation is available at fredantoncorvest.com/FAC_Phazer.html

About

Devil Spring Reverb

This app emulates the sound of a vintage tube amp's spring reverb, offering a warm, analog feel. It utilizes impulse responses and a custom convolution engine for realistic soundscapes, usable as a standalone application or within a DAW.

Highlights
  • AUv3 support
  • 38 spring reverb impulse responses
  • Optimized convolution engine
  • Adjustable tone and reverb length
  • Standalone app functionality
Read full description

Boing Boing makes my old tube amp when I move it or when I wildly unplug my jack! Well now, you just have to move your favorite DAW to hear the evil melody of the wiggling spring. It's vintage and It's very warm. All the sounds come from impulse responses grappled on the web. They've been cleaned up and I've been working on a convolution reverb algorithm optimized with small onions (french expression to said fine tuning). Can be used as standalone app too - AUV3 support - 38 spring reverbs impulse responses selected and cleaned - 3 levels of complexity (low and mid limit the audio bandwidth) - An optimized convolution engine that can go up to 4 seconds - A tone to adjust the brightness of the reverb - A tunable impulse response size (which also plays on the complexity) and a dry / wet mix to be able to go to extreme settings If you hear audio glitches, try to lower quality or decrease the reverb length or increase the buffer length in your daw parameter.

Screenshots

FAC Phazer3 screens
Devil Spring Reverb2 screens

Verdict

The call

The clearest difference is rating: FAC Phazer at 5.0 against Devil Spring Reverb's 4.4. FAC Phazer also leads on review sentiment (83% vs 50%) and ratings volume (30 vs 7). Devil Spring Reverb's advantage is in-app purchases (none vs 3) and price ($3.99 vs $9.99). On update cadence, 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 Phazer costs $9.99 and Devil Spring Reverb $3.99 up front. FAC Phazer sells 3 one-off in-app purchases. Devil Spring Reverb asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

FAC Phazer holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 30 and 7 respectively. Written reviews point the same way: 83% of FAC Phazer's written reviews are positive against 50% of Devil Spring Reverb's.

UpkeepUpdate frequency

FAC Phazer ships an update every 4 months, Devil Spring Reverb every 5 months. The most recent releases landed on September 22, 2026 and July 16, 2026 respectively.

Scorecard6 real differences · 4 level
FAC Phazer versus Devil Spring Reverb: the parameters behind the verdict, then further details
ParameterFAC PhazerDevil Spring Reverb
Price$9.99$3.99 — better
Rating5.0 (30 ratings) — better4.4 (7 ratings)
Positive reviews83.3% of reviews — better50.0% of reviews
Number of ratings30 — better7
Update frequencyEvery 4 months — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPad, MaciPhone, iPad, iPod, Mac — better
Requires iOS16.411.0 — better
Further details — not scored
Size3 MB87 MB
Age rating4+4+
DeveloperFrederic CorvestJulien Faure

Customer experience

FAC Phazer

All ratings30 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews18 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

Devil Spring Reverb

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews6 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

3 purchases

FAC Phazer

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

Devil Spring Reverb

No in-app purchases

Questions

Is FAC Phazer free?
FAC Phazer costs $9.99, and also offers in-app purchases.
Is Devil Spring Reverb free?
Devil Spring Reverb costs $3.99, with no in-app purchases.
Which has better reviews, FAC Phazer or Devil Spring Reverb?
FAC Phazer is rated higher. FAC Phazer averages 5.0 out of 5 from 30 ratings, while Devil Spring Reverb averages 4.4 from 7 ratings.
Do FAC Phazer or Devil Spring Reverb have ads?
Neither FAC Phazer nor Devil Spring Reverb shows ads.
Which is updated more often, FAC Phazer or Devil Spring Reverb?
FAC Phazer ships an update every 4 months, and Devil Spring Reverb every 5 months. Most recently, FAC Phazer was updated on September 22, 2026 and Devil Spring Reverb on July 16, 2026.

Other comparisons