Comparison

VOSIS vs Relic Flow

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

Head to head
About

VOSIS

This app transforms image data into sound, allowing for unique musical compositions and experimental sound design. It offers control over pitch, timbre, and envelopes to create shape-timbre relationships from visual input.

Highlights
  • Image sonification
  • Visual music composition
  • Experimental sound design
  • Pixel luminance audification
  • Shape-timbre relationships
  • Adjustable pitch and timbre
  • ADSR envelope control
Read full description

VOSIS is a synthesizer combining audification of greyscale pixel data with several image filters. It is a tool for image sonification, visual music composition, and experimental sound design. The audification of pixel luminance values creates shape-timbre relationships. Pixel scan rate is controlled in terms of note interval, octave, and scale to give varying pitch between image regions. The ADSR envelope allows one to play images as a non-linear sequence of pitches with varying wavetable/timbre. For more features including presets and unlimited recording see VOSIS Pro. Visit vosis.app for sound example, demo videos, and user guide!

About

Relic Flow

Generate unique Lo-Fi rhythms, noise patterns, and drum loops using advanced synthesis algorithms. Explore billions of sound samples with intuitive controls and real-time audio recording. Perfect for musicians and sound designers seeking endless creative possibilities.

Highlights
  • Lo-Fi rhythm and drum loop generation
  • Billions of unique sound samples
  • Real-time audio recording to WAV
  • Multiple input methods (on-screen, PC keyboard, MIDI)
  • Export to WAV, SunVox, and text clipboard
  • iOS Audio Unit Extension (AUv3) support
Features
Currently charting
Read full description

Relic Flow is a generator of Lo-Fi rhythms, noise patterns and drum loops based on unique synthesis algorithms from NightRadio. More than 4 billion samples from the depths of the Mathematical Universe! Features: * search for new sounds with three buttons: next random set, edit code, previous set; each set of 12 sounds corresponds to a code of 8 characters; * three types of keyboards for live performing: on-screen buttons, PC keyboard, MIDI input; * several processing parameters + control via MIDI; * real-time audio recording to WAV (32-bit); * export to: WAV (one file or a set), SunVox (samples + effects in one file), text clipboard; * the LCK button freezes individual samples - they will not change during the search for new sets; * iOS Audio Unit Extension (AUv3). Double clicking on a parameter opens a window for setting the exact value. If you enable the Hold option, the notes will play endlessly, without reacting to key release (noteOff) events; turning the note on again works like turning it off; there are two ways to enable this option: 1) using the Hold parameter in the "MIDI Mapping" window; 2) by pressing the HOLD button, which appears in place of LCK while playing the musical keyboard: press HOLD, release the desired notes - then the released notes will continue to play.

Screenshots

VOSIS2 screens
Relic Flow2 screens

Verdict

The call

The clearest difference is price: VOSIS at Free against Relic Flow's $1.99. VOSIS also leads on update cadence (every 8 months vs every 17 months). Relic Flow's advantage is rating (4.8 vs 4.2) and chart position (#198 vs unranked). On review sentiment, 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

VOSIS is free to download; Relic Flow costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Relic Flow holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: Relic Flow has 26 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 86% of VOSIS's written reviews are positive against 93% of Relic Flow's.

UpkeepUpdate frequency

VOSIS ships an update every 8 months, Relic Flow every 17 months. The most recent releases landed on September 4, 2026 and September 17, 2026 respectively.

Scorecard6 real differences · 5 level
VOSIS versus Relic Flow: the parameters behind the verdict, then further details
ParameterVOSISRelic Flow
PriceFree — better$1.99
Rating4.2 (5 ratings)4.8 (26 ratings) — better
Positive reviews85.7% of reviews93.3% of reviews — better
Number of ratings526 — better
Update frequencyEvery 8 months — betterEvery 17 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
Best chart rank#198 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size11 MB6 MB
Age rating4+4+
DeveloperLife Orange LLCAlexander Zolotov

Customer experience

VOSIS

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews14 reviews
Positive85.7%
Neutral0.0%
Negative14.3%

Relic Flow

All ratings26 ratings
Positive96.2%
Neutral0.0%
Negative3.8%
Written reviews15 reviews
Positive93.3%
Neutral0.0%
Negative6.7%

In-app purchases

None

VOSIS

No in-app purchases

None

Relic Flow

No in-app purchases

Questions

Is VOSIS free?
VOSIS is free to download, with no in-app purchases.
Is Relic Flow free?
Relic Flow costs $1.99, with no in-app purchases.
Which has better reviews, VOSIS or Relic Flow?
Relic Flow is rated higher. VOSIS averages 4.2 out of 5 from 5 ratings, while Relic Flow averages 4.8 from 26 ratings.
Do VOSIS or Relic Flow have ads?
Neither VOSIS nor Relic Flow shows ads.
Which is updated more often, VOSIS or Relic Flow?
VOSIS ships an update every 8 months, and Relic Flow every 17 months. Most recently, VOSIS was updated on September 4, 2026 and Relic Flow on September 17, 2026.

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