Comparison

JAF Model One 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

JAF Model One

This stereo audio effect plugin offers a virtual analog transistor ladder filter with self-oscillation capabilities. It features audio-rate modulation, onboard saturation for analog drive, and MIDI connectivity for real-time parameter control. Switchable between low-pass and high-pass modes, it can enhance individual tracks or entire mixes.

Highlights
  • Virtual analog transistor ladder filter
  • Self-oscillation capability
  • 24dB cutoff slope
  • Low-pass and high-pass modes
  • Stereo audio processing
  • Audio-rate modulation oscillator
  • Inbuilt saturation unit
  • MIDI connectivity for parameter automation
Features
Read full description

The MODEL ONE is a selected, fine-tuned general purpose (transistor ladder model) analog modelled filter with the ability of self oscillation. The cutoff slope is approximately 24dB. It can be switched to low pass or high pass processing mode. The Model One, like all our filter models, is a true stereo processing audio effect, which includes a special audio-rate (high frequency) modulation oscillator, that can modulate the main parameters of the filter to its extremes. The modulation oscillator is not related to the inbuilt unison oscillators, which is a complete separate, different unit. All our models have also an inbuilt additional saturation unit for the extra bit of analog drive. This saturation unit and the oscillator section can be used without the filter module, because the filter unit can be switched to pass the incoming audio signals thru. The available vintage warmer tube/tape saturation type for instance is an excellent choice for breathing life into any obvious digital audio material. It can be applied to entire mixes as to individual tracks and voices. The hosting app for the Model One has special MIDI connectivity, thus parameters can be automated with realtime MIDI Controllers (See MIDI implementation chart).  The MIDI features on the audio unit depends on the fact, whether the host application will send MIDI messages to the plugin in any way with the audio processing block or not. The audio unit can be loaded into all supporting audio unit hosts. If successfully loaded into a host, all parameter automation and preset handling will be handled by these host applications.

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

JAF Model One4 screens
Callback Freeverb4 screens

Verdict

The call

The clearest difference is price: Callback Freeverb at Free against JAF Model One's $9.99. Callback Freeverb also leads on rating (5.0 vs 4.7). JAF Model One's advantage is ratings volume (15 vs 1) and iOS requirement (12.0 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

Callback Freeverb is free to download; JAF Model One costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Callback Freeverb holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: JAF Model One has 15 ratings behind it against 1, so its average is the more settled of the two.

Scorecard5 real differences · 5 level
JAF Model One versus Callback Freeverb: the parameters behind the verdict, then further details
ParameterJAF Model OneCallback Freeverb
Price$9.99Free — better
Rating4.7 (15 ratings)5.0 (1 ratings) — better
Positive reviews85.7% of reviews—
Number of ratings15 — better1
Update frequencyEvery 9 days—
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.0
Further details — not scored
Size12 MB7 MB
Age rating4+4+
DeveloperJens GuellCallback Audio, LLC

Customer experience

JAF Model One

All ratings15 ratings
Positive93.3%
Neutral0.0%
Negative6.7%
Written reviews7 reviews
Positive85.7%
Neutral0.0%
Negative14.3%

Callback Freeverb

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

JAF Model One

No in-app purchases

None

Callback Freeverb

No in-app purchases

Questions

Is JAF Model One free?
JAF Model One costs $9.99, with no in-app purchases.
Is Callback Freeverb free?
Callback Freeverb is free to download, with no in-app purchases.
Which has better reviews, JAF Model One or Callback Freeverb?
Callback Freeverb is rated higher. JAF Model One averages 4.7 out of 5 from 15 ratings, while Callback Freeverb averages 5.0 from 1 ratings.
Do JAF Model One or Callback Freeverb have ads?
Neither JAF Model One nor Callback Freeverb shows ads.

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