Comparison

FAC Alteza vs Copperhead

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

Head to head
About

FAC Alteza

This app provides an exospheric stereo reverb with ultra-low latency pitch shifting for lush, dreamy sound textures. It features a unique feedback processor, fine-tuning of all-pass delays, and advanced controls for stereo width and sidechain ducking. Designed for musicians seeking ethereal soundscapes.

Highlights
  • Exospheric stereo reverb
  • Ultra-low latency pitch shifting
  • Shimmer and harmonizer effects
  • Unique feedback processor
  • All-Pass delay fine-tuning
  • Sidechain input for ducking
  • Separate Dry/Wet and feedback outputs
Read full description

• Exospheric stereo reverb with ultra low latency pitch shifting • Amazingly lush, dreamy and beautiful • Shimmer kind effect, harmonizer • Unique feedback processor and fine tuning of the All-Pass delays • High-pass filter and stereo width input controls, separate Dry/Wet outputs • Sidechain input to duck the reverb • Multiple outputs, extra output bus to route the feedback signal to your own fxs • Advanced Responsive Design, portrait and landscape views • iOS Audio Unit V3 - Universal (iPad/iPhone) Designed for ethereal lush sound textures and dreamy space reflection, FAC Alteza is the perfect solution to bring your instruments to heaven in no time. Thanks to a powerful feedback section containing, inter alia, two pitch shifters, the unit is able to deliver the very typical "Shimmer" sound kind effect very much prized by musicians that are making ambient music, or any kind of music that needs to be carried by a fabulous angelic evolving choir section. FAC Alteza is definitely not "another shimmer reverb..." effect because it comes with additional parameters that make it very versatile. A particular attention to each part of the signal path was necessary to reach this level of high-end quality. Here some features that make FAC Alteza an outstanding unit: • the input signal is not monoized by default, a knob allows to control the width of the input stereo image before reaching the reverb • the topology of the effect, based upon a series of All-Pass delays, allows to control the intrasec characteristics of the reverberation • the number of All-Pass delays per stage and the echo density are alterable in the main section and in the feedback section • two ultra low latency pitch shifters deliver progressive pitch-shifting of the reverberation tail or the input signal • the feedback section contains a blend knob to control how much of the original signal is mixed with the feedback reverb • the wet signal can be ducked by an external signal provided by the host - AuV3 and Standalone App - To use the sidechain and/or to output the additional feedback signal, you need a host able to provide to the AuV3 an input bus and an additional output bus. The documentation is available at fredantoncorvest.com/FAC_Alteza.html

About

Copperhead

This digital synthesizer plugin offers a vintage 80's sound with modern features like multi-note polyphony, an arpeggiator, and integrated audio effects. Design custom waveforms, explore various modulation options, and utilize a powerful sequencer to craft unique sounds.

Highlights
  • AUv3 compatible
  • Multi-note polyphony
  • Integrated arpeggiator
  • Customizable waveforms
  • Integrated audio effects
  • 32-step sequencer
  • Preset Manager
Features
Read full description

Copperhead is an AUv3 digital subtractive synthesizer plugin which draws its influence from the vintage synthesizers of the early 80's. Only now we have multi-note polyphony, a build in arpeggiator, and a host of integrated audio effects. Copperhead features a custom String Machine, the ability to design your own custom waveforms, as well as supporting oscillator sync and various cross modulation effects. Cross modulation is a type of FM synthesis which can be used to morph simplistic waveforms into something far more aggressive and interesting. At the heart of Copperhead are its two oscillators, which support all your traditional waveforms (SINE,SQR,SAW,TRI), as well as SuperSaw, Trapezium, and other user definable types. The app features pulse width modulation and supersaw, as well as a customisable string engine and the ability to create your own oscillator types. The Voltage Controller Filter supports the usual LP, HP, BP and Notch filters in series or parallel configuration, as well as a couple of unusual ones like Formant which allows you to sweep your cutoff to create interesting vowel sounds. Copperhead also features twin LFO's with random and one shot functionality. It also supports Cross, Ring and FM modulators, in addition to low and high shelf filters. One of the great features is the integrated audio gate, which allows you to generate stuttering audio right out of the box. Combined with effects such as Chorus, Overdrive, Delay, Reverb and Auto Pan / Tremelo, and the ability to specify effect order, you have a lot of control over your sound. If that wasn't enough, we also include a 32 step sequencer, with various mono and poly modes with direct control control of various synth elements. We have a built in Preset Manager which groups presets into banks and groups, which supports drag and drop for easy import/export of presets. You can also access your favourites from a special popup menu, or via the built in quick search facility. Copperhead now ships with over 550 presets which cover just about every instrument category you would ever need. ○ AUv3 compatible. ○ Up to 16 note polyphony. ○ 7 Oscillator wave types. ○ Sub Oscillator. ○ PW/PWM on SQR and TRP waveforms. ○ Supports SuperSaw with MIX and DETUNE. ○ XMod / Ring and FM modulations. ○ Osc Sync. ○ 6 types of VCF filter. ○ Low and High shelf on output. ○ Built in compressor. ○ Chorus, Delay, Overdrive, Reverb and Auto Pan effects. ○ Built in Audio Gate. ○ Preset Manager with Bank/Group/Preset section. ○ Supports drag and drop to import/export presets, groups and banks. ○ Supports web transfer of presets. ○ 32 step arpeggiator. ○ More than 550 built-in presets. NOTE: This is an AUv3 plugin which was designed to be hosted in DAW's such as AUM, Cubasis, GarageBand, Loopy Pro etc.

Screenshots

FAC Alteza4 screens
Copperhead4 screens

Verdict

The call

The clearest difference is in-app purchases: Copperhead at none against FAC Alteza's 3. Copperhead also leads on update cadence (every 3 weeks vs every 5 months). FAC Alteza's advantage is price ($9.99 vs $14.99) and rating (4.9 vs 4.7). On ads, monetization model, device support and iOS requirement 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 Alteza costs $9.99 and Copperhead $14.99 up front. FAC Alteza sells 3 one-off in-app purchases. Copperhead asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

FAC Alteza holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 81 and 18 respectively. Written reviews point the same way: 94% of FAC Alteza's written reviews are positive against 83% of Copperhead's.

UpkeepUpdate frequency

FAC Alteza ships an update every 5 months, Copperhead every 3 weeks. The most recent releases landed on September 24, 2026 and September 3, 2026 respectively.

Scorecard6 real differences · 4 level
FAC Alteza versus Copperhead: the parameters behind the verdict, then further details
ParameterFAC AltezaCopperhead
Price$9.99 — better$14.99
Rating4.9 (81 ratings) — better4.7 (18 ratings)
Positive reviews93.9% of reviews — better83.3% of reviews
Number of ratings81 — better18
Update frequencyEvery 5 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size3 MB69 MB
Age rating4+4+
DeveloperFrederic Corvest4Pockets.com

Customer experience

FAC Alteza

All ratings81 ratings
Positive97.5%
Neutral1.2%
Negative1.2%
Written reviews49 reviews
Positive93.9%
Neutral4.1%
Negative2.0%

Copperhead

All ratings18 ratings
Positive94.4%
Neutral0.0%
Negative5.6%
Written reviews18 reviews
Positive83.3%
Neutral11.1%
Negative5.6%

Bugs and requests

FAC Alteza

Reported bugs

2 issues
  • Not working on 2021 iPad as host
  • Doesn't freeze properly in Cubasis

Requested features

4 requests
  • Presets toned down
  • Encoders rotate slower for fine adjustments
  • More presets
  • MIDI control by foot switches

Copperhead

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

FAC Alteza

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

Copperhead

No in-app purchases

Questions

Is FAC Alteza free?
FAC Alteza costs $9.99, and also offers in-app purchases.
Is Copperhead free?
Copperhead costs $14.99, with no in-app purchases.
Which has better reviews, FAC Alteza or Copperhead?
FAC Alteza is rated higher. FAC Alteza averages 4.9 out of 5 from 81 ratings, while Copperhead averages 4.7 from 18 ratings.
Do FAC Alteza or Copperhead have ads?
Neither FAC Alteza nor Copperhead shows ads.
Which is updated more often, FAC Alteza or Copperhead?
FAC Alteza ships an update every 5 months, and Copperhead every 3 weeks. Most recently, FAC Alteza was updated on September 24, 2026 and Copperhead on September 3, 2026.

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