Comparison

Boost Pedal vs Callback Freeverb

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

Head to head
About

Boost Pedal

Features
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Boost Pedal is a professional clean boost effect designed for guitarists, bassists, and music producers. Add up to +20dB of transparent gain to push your amp into natural overdrive or cut through the mix. **Features:** - Up to +20dB clean boost - AUv3 plugin format — works in GarageBand, AUM, and any AUv3 host - Low noise, high headroom design - Simple, intuitive pedal-style interface - Zero-latency processing - MIDI control — map any external MIDI device or use the built-in MIDI pad to engage and disengage the boost hands-free **Perfect for:** - Pushing your amp into breakup - Solo boosts - Hands-free control on stage with MIDI Requires an AUv3-compatible host app.

About

Callback Freeverb

This app offers a classic algorithmic reverb effect based on the Freeverb algorithm. It adds depth, space, and atmosphere to audio sources, creating lush, spacious ambience. Designed for mono use, it provides a smooth, musical reverb tail suitable for vocals and synthesizers.

Highlights
  • Classic Freeverb algorithm
  • Schroeder/Moorer reverb topology
  • Comb and allpass filters
  • Mono operation
  • Adds depth and space to audio
  • Smooth, musical reverb tail
Features
Read full description

A classic algorithmic reverb effect based on the Freeverb algorithm by Jezar at Dreampoint. A Freeverb-style Schroeder/Moorer reverb based on the classic 8-comb + 4-allpass topology, with simplified controls and no stereo spread. This reverb creates lush, spacious ambience through a network of comb and allpass filters. Freeverb is widely used in electronic music production, ambient music, and sound design to add depth, space, and atmosphere to audio sources. The algorithm provides a smooth, musical reverb tail that works well on everything from vocals to synthesizers. This reverb only functions in mono and provides no stereo imaging, and the user can expect the same behavior as a classic Freeverb implementation otherwise.

Screenshots

Boost Pedal4 screens
Callback Freeverb4 screens

Verdict

The call

The clearest difference is price: Callback Freeverb at Free against Boost Pedal's $0.99. On ads, in-app purchases, 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

Callback Freeverb is free to download; Boost Pedal costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scorecard1 real difference · 8 level
Boost Pedal versus Callback Freeverb: the parameters behind the verdict, then further details
ParameterBoost PedalCallback Freeverb
Price$0.99Free — better
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyFortnightly—
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.417.0 — better
Further details — not scored
Size18 MB7 MB
Age rating4+4+
DeveloperRafael Guilherme BertholdoCallback Audio, LLC

In-app purchases

None

Boost Pedal

No in-app purchases

None

Callback Freeverb

No in-app purchases

Questions

Is Boost Pedal free?
Boost Pedal costs $0.99, with no in-app purchases.
Is Callback Freeverb free?
Callback Freeverb is free to download, with no in-app purchases.
Do Boost Pedal or Callback Freeverb have ads?
Neither Boost Pedal nor Callback Freeverb shows ads.

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