Comparison

Rithmatic vs SpolaSong

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

Head to head
About

Rithmatic

Explore a vast library of classic synthesizer sounds and learn the intricacies of FM synthesis. Create, blend, and play unique sounds using on-screen keys or a MIDI controller. This app functions as a standalone instrument and an AUv3 plugin for music production software.

Highlights
  • 36,118 classic DX7 voices included
  • AUv3 plugin for DAWs
  • Interactive FM synthesis learning tool
  • Patch blending and creation
  • On-screen and MIDI keyboard support
  • Arpeggiator and recording capabilities
  • Multiple tuning systems
Features
Read full description

Rithmatic is an FM synthesizer with 36,118 classic DX7 voices built in, and an AUv3 plugin for GarageBand on iPad and your DAW on the Mac. Browse them by family and by character, learn how FM works by watching it shape each one, build and blend your own, and play them from the on-screen keys or a MIDI keyboard. No account, no ads, nothing locked. Built for iPhone Duo: half open, it stands like a keyboard synth, the waves above the fold and long keys on the flat half. IN YOUR DAW • Put it on a track in GarageBand on iPad, or in an Audio Unit host on the Mac such as Ableton Live. • Its window is the app's own Patches screen and Patch Builder, with your library. • Your bank appears as the plugin's presets, and Brightness, Attack, Decay, Release and Feedback can be automated. The patch is saved with your project. A LIBRARY THAT SHIPS FULL • 36,118 unique DX7 voices come with the app: no download, no account, no network. • Start with Essentials: the famous sounds and the songs they're on. • Browse by family, or by character: percussive, plucked, metallic, bright, sustained, swell, evolving, mellow. Or search by name. • Patch of the day: one classic voice each day, in the app and in a widget for iPhone, iPad and Mac. PLAY IT • A DX7-compatible synthesis engine runs inside the app, so every patch plays with nothing plugged in. • Play from the on-screen keys, your Mac's keyboard, or any MIDI keyboard you connect. • Pitch bend, mod wheel, breath, sustain and aftertouch, with aftertouch set to vibrato, tremolo or swell. • Velocity from a MIDI keyboard, or turn it off and choose how hard every note plays. • An arpeggiator (up, down, up and down, random or as played, over up to three octaves) and a latch that holds each key. • Record what you play and share it as a WAV. • Five tunings: equal, just, and Wendy Carlos's Alpha, Beta and Gamma scales. • Light or dark, as your device is set or as you choose. Drag the keys taller or shorter. SEE THE SOUND The waveform follows what you play: each operator's envelope, how hard you hit, the pitch, the LFO's wobble, and a chord as one layer per note. Resize it, go full screen, or watch the output itself in the Scope look. PATCH BUILDER: LEARN HOW FM WORKS FM is famous for being hard to program. The Patch Builder shows you why a sound sounds the way it does. • All six operators on a graph, each cable carrying its wave: see a modulator reshape its carrier as you drag. • Draw a cable and the builder snaps to the nearest of the 32 algorithms, so you learn routing by doing it. • Plain words beside the jargon. Edit each operator's ratio, level, envelope and tuning, the LFO and pitch envelope, or use FEEL: thickness, touch and brightness. BLEND Pick two patches and Rithmatic blends them into eight new ones. Play each, and keep the ones you like. YOUR BANK AND FILES • Gather patches from anywhere into your bank, then drag pads to swap or reorder them. • Export the bank as standard DX7 .syx files. Open .syx banks, or a .zip of them, from Files, Mail, AirDrop or the Finder. • Share a sound as a short clip of it playing, with a card and a code that brings the patch into anyone's Rithmatic. WITH A SYNTH, IF YOU HAVE ONE Hardware is optional. Choose your synth in Settings: • Korg Volca FM2 (firmware 1.10 or later, over MIDI): read its current patch, write to any of its 64 memory slots, back up and restore all 16 sequencer patterns, and capture the whole instrument to a snapshot. • DX7 family: send patches and 32-voice banks to a DX7, TX7, TX802, the original Volca FM or the M-VAVE FM-1 over standard Yamaha voice dumps. FREE AND PRIVATE Every feature is free; tips are optional and unlock nothing. Rithmatic works offline and collects no personal data: no account, no analytics, no ads. KORG and volca are trademarks of Korg Inc., DX7 and TX of Yamaha Corporation, M-VAVE of its owner. Rithmatic is an independent app, not affiliated with or endorsed by any of them.

About

SpolaSong

Features
Read full description

SpolaSong turns your iPhone or iPad into a stage keyboard: 55 real sounds inside the app — pianos, organs, strings, choir, pads, woodwinds, brass, guitars, basses and world instruments — ready to play, even with no internet. TRY IT FREE Play as much as you like for 30 minutes. The clock only runs while you play. Like it? Unlock everything with a single purchase: no subscription and no ads. OPEN AND PLAY The keyboard opens on screen ready to play. Change octave with one tap, make the keys bigger or smaller, and jump back to the keyboard from anywhere in the app. NEW: WORLD INSTRUMENTS Sitar, shehnai, pan flute, kalimba, steel drums and shamisen, plus accordion and harmonica, in their own category. LAYER UP TO 4 SOUNDS Piano and strings on the same key, or bass in the left hand and piano in the right. There are 19 ready-made combinations: one tap and you are set. FOR CHURCH, BAND AND STAGE Build your songs in sections (intro, verse, chorus) and switch every sound at once during the performance. Stage Mode shows song name, key, tempo and lyrics in large type. There is also a background pad in the song's key, a metronome, transpose, tuning and backing tracks. RECORD AND LISTEN Record what you played, listen right away, delete what you don't like and share the file. A REAL MIDI KEYBOARD, TOO Connect a MIDI keyboard over USB or Bluetooth and play with the touch of your hands and a sustain pedal. With MIDI Learn, your keyboard's buttons switch songs and sections. INSIDE GARAGEBAND SpolaSong is also an Audio Unit (AUv3) instrument, free, for use inside GarageBand and other compatible apps. YOUR OWN SOUNDS Import your own sound banks and use them in the same songs and sections. In English, Portuguese, Spanish, German, French, Japanese, Korean and Indonesian.

Screenshots

Rithmatic4 screens
SpolaSong3 screens

Verdict

The call

The clearest difference is device support: Rithmatic at 4 against SpolaSong's 2. On price, update cadence, 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

Both are free to download. Rithmatic sells 4 one-off in-app purchases and SpolaSong sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 days. Both last shipped on November 13, 2026.

Scorecard1 real difference · 9 level
Rithmatic versus SpolaSong: the parameters behind the verdict, then further details
ParameterRithmaticSpolaSong
PriceFreeFree
Rating4.6 (10 ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings10 — better—
Update frequencyEvery 3 daysEvery 3 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS15.0 — better16.0
Further details — not scored
Size61 MB394 MB
Age rating4+4+
DeveloperMADE WITH BEST PRACTICE LLCR.R. PROCESSAMENTO DE DADOS E SERVIÇOS SS LTDA

In-app purchases

4 purchases

Rithmatic

One-time4
  • Small Tip$4.99
  • Medium Tip$9.99
  • Large Tip$19.99
Show 1 more
  • Extra Large Tip$49.99
1 purchases

SpolaSong

One-time1
  • SpolaSong Full Unlock$14.99

Questions

Is Rithmatic free?
Rithmatic is free to download, with in-app purchases available.
Is SpolaSong free?
SpolaSong is free to download, with in-app purchases available.
Do Rithmatic or SpolaSong have ads?
Neither Rithmatic nor SpolaSong shows ads.
Which is updated more often, Rithmatic or SpolaSong?
Rithmatic ships an update every 3 days, and SpolaSong every 3 days. Most recently, Rithmatic was updated on November 13, 2026 and SpolaSong on November 13, 2026.

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