SynthBridge MIDI Synth vs Beat Kitchen Harmonic Synth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SynthBridge MIDI Synth
Transform your device into a versatile MIDI sound module and virtual piano. Load SoundFont files, connect controllers, and utilize expressive performance tools for practice, production, or live music.
- MIDI controller support (Bluetooth, USB, Network)
- SoundFont (SF2/SF3) loading and playback
- Multi-touch piano keyboard and drum pads
- Pitch bend and modulation wheels
- MIDI file playback and recording
- Customizable velocity curves
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Connect your MIDI keyboard, choose a sound, and play. SynthBridge turns your phone or tablet into a portable sound module and practice workspace. You can also start with the on-screen piano and drum pads. Your sounds: use the built-in library or import SF2/SF3 SoundFonts. Layer sounds and adjust their balance, effects and keyboard ranges. Your keyboard: connect compatible USB MIDI or Bluetooth MIDI devices. Control supported parameters with MIDI CC messages. Your practice: play MIDI files, follow the note visualization, and combine a metronome, loops and Style accompaniment. Your ideas: record MIDI performances, keep named drafts, preview takes and export MIDI files. MIDI files can also be converted to WAV or AAC audio. Your setup: save performance scenes and return to your sounds and playing settings. Use portrait or landscape layouts on phones and tablets. Some features and resources require in-app purchases. iOS or iPadOS 15.0 or later. USB and Bluetooth MIDI require compatible devices and accessories. https://synth.64bit.us/privacy.html https://synth.64bit.us/terms.html
Beat Kitchen Harmonic Synth
Shape the overtone series directly to create unique sounds. This additive synthesizer allows real-time manipulation of harmonics, LFOs, and envelopes. Explore sound design and synthesis on your device.
- Additive synthesis engine
- Overtone series shaping
- Live waveform and spectrum response
- Modulation matrix with LFOs and envelopes
- AUv3 support
- On-device processing
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BKS Harmonic is an additive synthesizer that builds sound from individual overtones, then gives you tools to shape, scan and filter them by harmony. Load it as an Audio Unit v3 inside AUM, GarageBand, Cubasis, Loopy Pro or any AUv3 host, or run it standalone. A TUNER THAT KNOWS ABOUT STRETCH Tune mode turns the scope into a tuner: it names the note it hears and shows how far sharp or flat it is in cents, with a ring that closes as you land on the pitch. It tunes against the stretch curve rather than equal temperament, so it follows a real instrument. Stretch shapes the overtones inside a note; Key Stretch makes the keyboard follow it, so octaves widen the way a piano's do. FOURTEEN TUNING SYSTEMS, AND A TEMPERAMENT EDITOR Equal and Just, five historical temperaments, and six from outside the European tradition including Maqam Rast, Turkish Rast, Slendro, Pelog and the Harmonic Series. The Temperament slider is a morph, not a switch: fully left is Just, fully right is whichever you chose. Twelve bars show any system as cents away from equal; drag one to make the tuning yours, then copy it out as plain text. Tunings save with the preset. FIVE HUNDRED SCALES Searchable by alternate name: malkauns, nikriz, bhupali and freygish find the right set. THE PARTIALS ARE THE INSTRUMENT The partials display shows every overtone in your sound, and four tools work on it directly. FOLD sweeps upper partials below the fundamental, redistributing energy across harmonic layers — not a filter. The OVERTONE SCAN steps a spotlight through individual partials with triangle, saw or random patterns, and can visit only partials in the active scale. The HARMONIC GATE reinforces partials whose pitch class matches your chord and suppresses the rest: capture a chord, follow MIDI, split the keyboard, or pick the notes on the gate's own keys. SCULPT draws the level and pan of every partial, slides the curve up the grid as a formant, and locks partials in place while the rest moves. THE HARMONIC VOCODER Pass live input or a sample through the synth as an effect. Your sound travels through a bank of tuned peaking bells rather than being replaced by filtered noise: open the Air and the source stays dry, tighten it and the bands resonate into it. Key Track is the mode switch: on it plays as an instrument, off it is a fixed filter you can sweep. Aimed at a sample, the bands track that sample's spectrum as it evolves. One level-matched Blend control crossfades it against the oscillators. PULSE-WIDTH MODULATION Set the core to a saw and Source 2 to a saw: the two ramps subtract, which is what a pulse wave is, and the phase between them sets the duty cycle. Modulate it and you have PWM. A preset in the Utility folder is ready to play. MODULATION A cog on almost every control, so the synth's own engine can drive nearly anything in the interface, including the display. Sources include velocity, envelopes, LFOs, how many notes you hold, how many oscillators sound, the synth's own output level, and Atmo, a shape driven by 84 years of barometric weather data from the Beat Kitchen Weather Sonification Project. Rates run from audio rate down to cycles that span years. THE SCOPE A stereoscope, oscilloscope, spectrum and a live per-partial display. Glow takes the trace from a hard line to a diffuse bloom, Colour sets the hue, Trace Speed and Dot set how it draws — and every one is a modulation target. Route velocity to Colour and the trace shifts as you play. LIVE INPUT A headphone button passes the side-chain straight to the output, so you can hear and see your input with nothing held: green when signal arrives, amber when a bus is connected but silent, red when nothing is. Resynth Speed locks a sample's playback speed to pitch, tape-style, or keeps them independent. Every control has a tooltip, presets work offline, and a harmony wheel follows what you play. One purchase, every update. Made by Beat Kitchen, a music production and teaching community.
Screenshots
Verdict
The clearest difference is update cadence: Beat Kitchen Harmonic Synth at every 3 days against SynthBridge MIDI Synth's every 11 days. Beat Kitchen Harmonic Synth also leads on ratings volume (12 vs 3). On price, rating, review sentiment and ads 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
Both are free to download. SynthBridge MIDI Synth sells 7 in-app purchases, starting at $1.99 per month and Beat Kitchen Harmonic Synth sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.7 for SynthBridge MIDI Synth against 4.8 for Beat Kitchen Harmonic Synth. Both are backed by a comparable volume of ratings — 3 and 12 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
SynthBridge MIDI Synth ships an update every 11 days, Beat Kitchen Harmonic Synth every 3 days. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.
| Parameter | SynthBridge MIDI Synth | Beat Kitchen Harmonic Synth |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (3 ratings) | 4.8 (12 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 3 | 12 — better |
| Update frequency | Every 11 days | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 76 MB | 60 MB |
| Age rating | 4+ | 4+ |
| Developer | 啟东 徐 | Beat Kitchen LLC |
Customer experience
SynthBridge MIDI Synth
Beat Kitchen Harmonic Synth
In-app purchases
SynthBridge MIDI Synth
- Cloud Monthly7 Days trial$1.991 Month
- Cloud Yearly7 Days trial$12.991 Year
- Supporter Tip$0.99
- Remove Ads$1.99
- Supporter Plus$4.99
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- SynthBridge Pro$4.99
- Supporter Patron$9.99
Beat Kitchen Harmonic Synth
- Full Unlock$14.99
Questions
Is SynthBridge MIDI Synth free?
Is Beat Kitchen Harmonic Synth free?
Which has better reviews, SynthBridge MIDI Synth or Beat Kitchen Harmonic Synth?
Do SynthBridge MIDI Synth or Beat Kitchen Harmonic Synth have ads?
Which is updated more often, SynthBridge MIDI Synth or Beat Kitchen Harmonic Synth?
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