Comparison

RealPhase vs isfizz

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

Head to head
About

RealPhase

This app faithfully reproduces the sound of a legendary analog phaser pedal. It offers advanced modulation options, including barberpole effects and MIDI sync, for creating complex and rhythmic phasing sounds. Visualize real-time frequency response and enjoy exceptional multirate performance.

Highlights
  • Faithful reproduction of legendary phaser pedal
  • Composite LFOs and parallel phaser structures
  • Barberpole/Shepard phasing
  • Rhythmic pattern creation with LFO ratios
  • Mid-Side modes for stereo phasing
  • Real-time notch filter frequency visualization
  • MIDI note event reception for sync
Features
Read full description

Do you remember the single most iconic phaser you've ever heard? For the first time, there's a good chance of finding that exact sound captured in a plugin. FEATURES: • Faithful reproduction of a legendary 4-stage phaser pedal from the late 70's - early 80's • Complex effects can be built using composite LFO's, parallel phaser structures, as well as an independent modulation system for the sweep range • Barberpole or "Shepard" phaser included: infinitely rising / falling modulation that can optionally be combined with sweep range modulation • Strong, rhythmic / syncopated patterns can be created by configuring different LFO frequency ratios within the various modulation sources • Mid-Side modes allow adding special phasing effects to stereo sounds • Exact visualization of the notch filters' real-time frequency response, with different stereo options • Exceptional multirate performance: results are less sampling rate-dependent than what's currently available with most digital phasers (even from major manufacturers) • Designed to be an anthology app extensible with additional hardware-based or synthetic analog models in future MIDI NOTE EVENT RECEPTION: RealPhase can accept MIDI note messages, syncing an envelope-based modulation source to note on and off events. This makes it easy to use RealPhase as a powerful analog modeling OTA-based resonant notch filter with any synth or sampler. PLEASE NOTE: • An Audio Unit v3 compatible host app is required to use this plugin • Supported sampling rates: 44.1, 48, 96 kHz

About

isfizz

This app plays SFZ files, an open format for sampled sound instruments. It supports various audio file formats, MIDI, and Scala tuning files. It also functions as an Audio Unit Extension (AUv3) for use with other music apps.

Highlights
  • SFZ file playback
  • Audio Unit Extension (AUv3) support
  • Edit SFZ strings
  • Load SFZ files in place
  • Scala tuning file support
  • MIDI support
Features
Read full description

isfizz is a SFZ file player. SFZ is an open text format for sampled sound instruments. This app can load SFZ and play the instrument. - Includes Audio Unit Extension (AUv3). - You can edit SFZ string. - The app loads SFZ files in place without copying the files. - Double tap to enter the value, triple tap to reset. - Supports Scala tuning files (.scl). - Supports MIDI. - Supports 16 out. use the "output=N" opcode in SFZ. Supported sample file format: - .wav (raw PCM) - .aiff - .mp3 - .flac - .ogg (vorbis) - .wv (wavpack) This app is an iPhone/iPad port of sfizz-ui project. The app is made from some sfizz-ui codes and images. About half of the income from this app will be donated to SFZ Tools team. This app and the description contain machine translated text.

Screenshots

RealPhase2 screens
isfizz4 screens

Verdict

The call

The clearest difference is price: isfizz at $2.99 against RealPhase's $14.99. isfizz also leads on update cadence (fortnightly vs every 14 months). RealPhase's advantage is rating (5.0 vs 4.7) and iOS requirement (12.1 vs 15.0). On review sentiment, ratings volume, ads and in-app purchases 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

RealPhase costs $14.99 and isfizz $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

RealPhase holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 5 and 14 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

RealPhase ships an update every 14 months, isfizz fortnightly. The most recent releases landed on September 15, 2026 and September 19, 2026 respectively.

Scorecard4 real differences · 6 level
RealPhase versus isfizz: the parameters behind the verdict, then further details
ParameterRealPhaseisfizz
Price$14.99$2.99 — better
Rating5.0 (5 ratings) — better4.7 (14 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings514 — better
Update frequencyEvery 14 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS12.1 — better15.0
Further details — not scored
Size8 MB6 MB
Age rating4+4+
DeveloperquantovoxRyouta Kira

Customer experience

RealPhase

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

isfizz

All ratings14 ratings
Positive92.9%
Neutral0.0%
Negative7.1%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

RealPhase

No in-app purchases

None

isfizz

No in-app purchases

Questions

Is RealPhase free?
RealPhase costs $14.99, with no in-app purchases.
Is isfizz free?
isfizz costs $2.99, with no in-app purchases.
Which has better reviews, RealPhase or isfizz?
RealPhase is rated higher. RealPhase averages 5.0 out of 5 from 5 ratings, while isfizz averages 4.7 from 14 ratings.
Do RealPhase or isfizz have ads?
Neither RealPhase nor isfizz shows ads.
Which is updated more often, RealPhase or isfizz?
RealPhase ships an update every 14 months, and isfizz fortnightly. Most recently, RealPhase was updated on September 15, 2026 and isfizz on September 19, 2026.

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