Comparison

RadioSI vs Harmonaut

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

Head to head
About

RadioSI

Features
Read full description

Official Slovenian international radio station - RTV SLO Radio Si. Broadcasting in Slovene, English and Deutsch

About

Harmonaut

Create music by feel without needing music theory. This app generates rich chords and smooth progressions, allowing you to shape the mood with intuitive controls. Save and reorder your musical ideas effortlessly.

Highlights
  • Play by feel, no theory required
  • Shape mood with tension and brightness faders
  • Smooth voice leading for flowing progressions
  • Chords named for musicians
  • Save and reorder progressions
  • Works on iPhone and iPad
Features
Read full description

Harmonaut™ is a chord instrument you play by feel. Press a key and hear a rich chord, voice-led smoothly from the last one, no theory needed. Build a progression, shape its mood, and export it as MIDI for your track. Two faders let you shape the mood as you play: more tension or less, brighter or darker, even major to minor. Chase a moody electronic progression, a warm lo-fi loop, a jazzy turn, a cinematic swell, or a simple pop hook. It all comes from your intent, not from naming chords. HOW IT PLAYS • Tension that actually resolves: chords that lean, pull home, and land, so your progression goes somewhere instead of just floating • Every one of the twelve keys is in play: reach past the obvious chords for richer, more surprising color, and it still sounds right • Build a whole progression, not just four chords: every chord you play lands in your trail, ready to reorder or duplicate to try new versions in seconds • Pick up right where you left off: your ideas are saved for you TAKE IT TO YOUR TRACK • Export any progression as a MIDI file and drop it into BandLab, GarageBand, or any DAW that opens MIDI, then play it through any instrument you like • Export to iReal Pro format to keep a chord chart or practice over the changes • Harmonaut Pro unlocks MIDI export, iReal Pro export, and unlimited saved progressions IT SOUNDS GOOD FOR A REASON Every chord is voice-led from the one before it, live, as you play: the notes move the shortest way, so a progression flows instead of jumping around. That's the finished feeling you hear in the songs you love. Push Intensity and the voicings open up: lush 9ths, bright 13ths, and altered dominants like G7#9b13, the colors session keyboard players reach for. And Harmonaut names every chord the way musicians actually write it, like Ebmaj7, so you can hand your progression to a session player, a bandmate, or a producer and they'll play it back exactly, first time. No box to buy, nothing to charge, no menus to dig through. It's already in your pocket. Whether it's your first progression or a sound you can hear but can't name, Harmonaut meets you where you are. See the end user license agreement at the following link: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

RadioSI3 screens
Harmonaut4 screens

Verdict

The call

The clearest difference is update cadence: Harmonaut at every 10 days against RadioSI's every 7 months. On price, 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

RadioSI ships an update every 7 months, Harmonaut every 10 days. Both last shipped on October 8, 2026.

Scorecard1 real difference · 9 level
RadioSI versus Harmonaut: the parameters behind the verdict, then further details
ParameterRadioSIHarmonaut
PriceFreeFree
Rating—5.0 (6 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—6 — better
Update frequencyEvery 7 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better17.0
Further details — not scored
Size40 MB117 MB
Age rating12+4+
DevelopereAvioDistrict One Mobile, LLC

In-app purchases

None

RadioSI

No in-app purchases

None

Harmonaut

No in-app purchases

Questions

Is RadioSI free?
RadioSI is free to download, with no in-app purchases.
Is Harmonaut free?
Harmonaut is free to download, with no in-app purchases.
Do RadioSI or Harmonaut have ads?
Neither RadioSI nor Harmonaut shows ads.
Which is updated more often, RadioSI or Harmonaut?
RadioSI ships an update every 7 months, and Harmonaut every 10 days. Most recently, RadioSI was updated on October 8, 2026 and Harmonaut on October 8, 2026.

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