Comparison

Tonic Synth vs GSi Piano Studio

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

Head to head
About

Tonic Synth

A powerful synthesizer app offering three oscillators with diverse sound sources, including physical modeling and wavetables. It features eight analog filter simulations, extensive modulation options, and a full effects rack. Available as a standalone app or AU/AUv3 plugin for Mac and iOS.

Highlights
  • Three oscillators with physical modeling, virtual-analog, wavetable, SF2, and sysex FM
  • Eight analog filter simulations (LP/HP/BP/Notch, 12/24 dB)
  • Comprehensive modulation: LFO, envelope follower, note-per-note filter envelope
  • Full effects rack: chorus, delay, reverb, EQ, compressor, flanger, phaser
  • Standalone app and AU/AUv3 plugin support
  • Live performance features: editable presets, six scenes, MIDI Learn
Features
Read full description

Eight sound engines in one instrument — and a whole preset community living inside it. Physical modeling, virtual analog, 3D wavetable, 6-operator FM and a full SoundFont player: stack up to three engines per sound, each with its own filter, envelope and modulation. Play it standalone on iPhone, iPad and Mac, or load it as an AUv3 plug-in — instrument and effect — in your favorite host. One purchase. No subscription, no ads, nothing locked behind a paywall. • TONICA — THE SOUND COMMUNITY Your next signature sound might come from a player on the other side of the world. Browse what the community publishes without ever leaving the app: one tap auditions it under your fingers, two taps keep it. Love an author? Take their whole collection at once, into a bank named after them. And publish yours with a single tap — no account, no sign-up, no cost. • THREE OSCILLATORS Up to three independent layers — each with its own source, filter, envelope and modulation, plus mute/solo and keyboard split. From a simple patch to a fat, detuned stack on one spread knob. The Vector pad morphs across all three layers in real time: draw a path and the sound travels it on its own. • SOUND ENGINES Per layer: physical modeling (string, modal, wind, bowed), virtual analog (sine, saw, square, triangle, pulse and super-saw, with sub-oscillator and noise), wavetables up to 128 frames, SoundFont (.sf2 and compressed .sf3) and 6-operator FM that opens .syx cartridges. Record anything through the mic and turn it into a wavetable — or draw the waveform with your finger and hear it instantly, on a 3D landscape you can drag, rotate and resize. • FILTERS Eight analog-modeled voicings — LP/HP/BP/Notch, 12 or 24 dB per octave, resonance into self-oscillation, drive and 4× oversampling. From warm ladder to creamy SVF, from acid squelch to screaming resonance. • ARPEGGIATOR & SEQUENCER A step editor with a live playhead: ties, ratchets, accents and per-step probability, polymetric rhythm masks, capture of what you just played, swing, gate mode, key range and per-layer arping. Imports .mid patterns, follows MIDI Clock, and with Hold the pattern runs by itself. • EFFECTS RACK Chorus, tempo-synced ping-pong delay, 6-type FDN reverb, 5-band EQ, compressor and a Flanger/Phaser module — each one switchable and routable per layer. • BUILT FOR THE STAGE Six scenes (A–F) swap the entire patch live without cutting the sound: the note ringing out finishes naturally while the next one already speaks with the new tone. Switched apps mid-set? A sustain pedal left down or a mod wheel parked halfway no longer hijacks your sound — every control starts working again the moment you move it. The MIDI filter decides what each pedal, wheel or controller is allowed to do, and can target one specific device when there's more than one keyboard in the rack. Program Change and Bank Select switch sounds from your controller. MIDI Learn on any control, over USB or Bluetooth. • YOUR LIBRARY 280+ factory sounds in banks, and your own collection beside them: favorites, renaming, saving, tagging and search by name, tag or bank. Two file formats of its own — one to share sounds (.tpr) and one for a full library backup (.tbk). Double-click a file, or receive one by AirDrop, and it merges straight in without duplicating anything. • WHERE IT RUNS iPhone, iPad and Mac, from a single purchase. As an AUv3 it runs in the major recording apps on iOS and macOS. Using software that doesn't load AUv3 yet? See rsjb.com.br/support for the route other users have already proven. Thank you for playing with RSJB - made by musicians for musicians! Follow the news at www.rsjb.com.br/en

About

GSi Piano Studio

This application uses advanced synthesis to recreate the sound of a grand piano. Users can customize various elements of the piano's mechanics to achieve unique sounds. It requires a physical MIDI keyboard for playback and is best suited for modern devices.

Highlights
  • Physical modeling sound generation
  • Full polyphony
  • Virtual sympathetic resonance
  • Customizable velocity curves
  • Session Recorder
  • AUv3 plugin support
Read full description

GSi Piano Studio is a software that recreates the sound of a gorgeous Grand Piano using Physical Modeling synthesis. INSTRUMENT BACKGROUND There are two ways to recreate the sound of a Grand Piano digitally: either using large sample sets, or using synthesis. As for the sample approach, GSi offers Genuine Sounds Vol. I that includes a wide variety of large sample sets directly recorded from actual acoustic instruments. Piano Studio, instead, recreates the sound using mostly digital synthesis techniques, by replicating the single elements that constitute the complex mechanic assembly of an actual piano: keys, hammers, strings, soundboard, enclosure, lid, etc. Some of these elements can also be modified via user parameters, such as the string dampening, detuning, sympathetic resonances, impact on the duplex-scale, hammer hardness and so on, so that the sound can be further refined or altered in order to obtain a different flavor of sound, or even something that goes beyond the natural sound of a Grand Piano. Main features - Full polyphony - Virtually unlimited dynamics - Long and natural decays - Supports real sympathetic resonance - Supports half-pedal and re-pedaling - 6 Ambience selections - 12 Virtual microphones - 9 Preamp types - Built-in limiter/compressor - 6-band visual equalizer with spectrum analyzer - Ping-Pong delay and Reverb - Customizable velocity curves - Session Recorder: records while you play, loads/saves SMF - Program manager with unlimited Programs - Available as Stand-alone App and AUv3 plugin - Low CPU load and RAM usage Please note: this App has no screen keyboard, you need to connect a physical MIDI keyboard to play. Also, you need a modern device, possibly iPad 9th gen or newer, iPhone 14 or newer. Older devices might not have enough CPU power for performing well at full polyphony.

Screenshots

Tonic Synth4 screens
GSi Piano Studio4 screens

Verdict

The call

Tonic Synth and GSi Piano Studio both sit at 5.0 stars, but that hides the real split: 100% of Tonic Synth's written reviews are positive against 33% of GSi Piano Studio's. Tonic Synth also leads on update cadence (every 4 days vs monthly). GSi Piano Studio's advantage is price ($19.99 vs $24.99). On rating, 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

Tonic Synth costs $24.99 and GSi Piano Studio $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Tonic Synth against 5.0 for GSi Piano Studio. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 100% of Tonic Synth's written reviews are positive against 33% of GSi Piano Studio's.

UpkeepUpdate frequency

Tonic Synth ships an update every 4 days, GSi Piano Studio monthly. Both last shipped on October 24, 2026.

Scorecard3 real differences · 7 level
Tonic Synth versus GSi Piano Studio: the parameters behind the verdict, then further details
ParameterTonic SynthGSi Piano Studio
Price$24.99$19.99 — better
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews — better33.3% of reviews
Number of ratings11
Update frequencyEvery 4 days — betterMonthly
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS17.016.0 — better
Further details — not scored
Size34 MB99 MB
Age rating4+4+
DeveloperRubens FelicioGenuine Soundware

Customer experience

Tonic Synth

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

GSi Piano Studio

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive33.3%
Neutral33.3%
Negative33.3%

In-app purchases

None

Tonic Synth

No in-app purchases

None

GSi Piano Studio

No in-app purchases

Questions

Is Tonic Synth free?
Tonic Synth costs $24.99, with no in-app purchases.
Is GSi Piano Studio free?
GSi Piano Studio costs $19.99, with no in-app purchases.
Which has better reviews, Tonic Synth or GSi Piano Studio?
Tonic Synth and GSi Piano Studio are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Tonic Synth or GSi Piano Studio have ads?
Neither Tonic Synth nor GSi Piano Studio shows ads.
Which is updated more often, Tonic Synth or GSi Piano Studio?
Tonic Synth ships an update every 4 days, and GSi Piano Studio monthly. Most recently, Tonic Synth was updated on October 24, 2026 and GSi Piano Studio on October 24, 2026.

Other comparisons