FluidSynth MIDI Synthesizer

2.0.35

Volcano Mobile SNC

4.00

1,064 reviews

100,000+
Downloads

Free

Turn your device into a FluidSynth synthesizer.

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Pros & Cons

Low-latency FluidSynth-based MIDI synthesis
Supports loading SoundFont (.sf2) for customizable sounds
Record performances as WAV files
Free to use and opensource-oriented variant of FluidSynth

Requires external SoundFont (.sf2) files to function (note states this is required)
Listing does not prominently advertise keyboard-focused features common in competitors
Does not explicitly highlight latency controls or studio-style features that some competitors emphasize

About FluidSynth MIDI Synthesizer

FluidSynth MIDI Synthesizer is a music & audio app developed by Volcano Mobile SNC.

How many times has FluidSynth MIDI Synthesizer been downloaded?

FluidSynth MIDI Synthesizer has been downloaded 230 thousand times. In the last 30 days, the app was downloaded 2.5 thousand times.

What is the rating of FluidSynth MIDI Synthesizer?

FluidSynth MIDI Synthesizer is rated 4.00 out of 5 stars, based on 1.1 thousand ratings.

Is FluidSynth MIDI Synthesizer free?

FluidSynth MIDI Synthesizer is free to download. The APK download size is 15.15 MB. The latest version available is 2.0.35. The last update was on October 28, 2025.

What are the requirements for FluidSynth MIDI Synthesizer?

FluidSynth MIDI Synthesizer requires Android 6.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play October 2016.

Description

NOTE: A SoundFont (.sf2) is required to use this synthesizer.

More data about FluidSynth MIDI Synthesizer

Price	Free to download
Total downloads	230 thousand
Recent downloads	2.5 thousand
Rating	4.00 based on 1.1 thousand ratings
Ranking	Not ranked
Version	2.0.35
APK size	15.2 MB
Number of libraries	13
Designed for Android	6.0+
Suitable for	Everyone
Ads	NO ads

App Performance Report

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Alternative downloads for the FluidSynth MIDI Synthesizer app

FluidSynth MIDI Synthesizer compared with similar apps

Common keywords of similar apps

Fluidsynth Synthesizer Midi Device Soundfont

Keywords missing from this app

Music Piano App Keyboard Support Expressive Usb Files Play Devices Sound Keys Instruments Playing Reverb Features Synth Sounds Audio Recent Performance Controller Https Instrument Pitch Modulation Phone Fm Volume Record File Karaoke Time Note Mpe Notes Latency Full Version Updated Create Controllers Delay Low Screen

Google Play Rating history and histogram

Downloads over time

FluidSynth MIDI Synthesizer has been downloaded 230 thousand times. Over the past 30 days, it averaged 84 downloads per day.

Changelog of FluidSynth MIDI Synthesizer

Show changelog

Developer information for Volcano Mobile SNC

Volcano Mobile SNC

contact@volcanomobile.net

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Comments on FluidSynth MIDI Synthesizer for Android

★★★★☆ Bri Dono · Mar 11, 2023

Love the responsiveness (no latency) between keyboard and output. The app recognizes all the main midi commands. There's still plenty of SF2 sounds out there to take advantage of. The only issue is that I have been unable to find a way to delete any individual sound font. If you test out a sound font, and then don't like it, I can't delete it. I have to go to the apps data and delete that way, but that deletes all sound fonts. Even with that, I still highly recommend it! - Jack

★★★★★ nylesteiner · Oct 4, 2025

I give this app 10 stars but rating system only supports 5. This app plays all my sound fonts perfectly with filter and all midi controls etc. Working exactly as I set them up and with very low latency Wow!!!!! Only problem is no reverb. Fix that, and I will give you15 stars Reverb works fine and sounds very good now that I realized left channel reverb was cancelling right channel reverb. Setting the reverb width to zero fixed this and now all is well with the reverb.

★★☆☆☆ Alan Dens · Jul 5, 2022

Worked on a Casio WK 200 & Williams electronic keyboard, but I couldn't close the delay in the more than noticeable latency gap. Used it on an Alexis Q88 controller which had much less of a latency gap but worsening crackling in the audio, then the app stopped altogether transmitting through Bluetooth after I unplugged the usb B adapter end out. Will reinstall & see if I can get it going again tho, it had some promise being user-friendly up to a point. Used another device & Alexis Q88 controller

★★☆☆☆ Lenik Terenin · Dec 19, 2023

SFX -> Reverb -> Reset (button) does not only reset Reverb settings, but also deletes all assigned instruments and kills all sounds. Had to reinstall. No control over the sound volume is also quite disappointing. Otherwise -- synth, as in original library, works very similar to the PC version.

★☆☆☆☆ Dave Lennon-Copeland (Flickering State) · May 24, 2023

"Turn your device into a Fluid Synth synthesizer"... ONLY if you plug in a physical keyboard. There is no on-screen keyboard and no way to play midi files. This is just a fancy driver for a USB keyboard, kinda pointless really.

★★☆☆☆ Kaden Ward · Aug 23, 2021

Was a good app for using a cheaper MIDI keyboard to play a cleaner sound front. New update has started to cause sound to crackle when playing, enough to the point that it's no longer usable. -Tested headphone, headphone aux cable, USB MIDI cable, and sound front file. -Tried disabling audio effects. -Tried changing in app volume.

Google Play Rankings for FluidSynth MIDI Synthesizer

This app is not ranked

Technologies used by FluidSynth MIDI Synthesizer

FluidSynth MIDI Synthesizer is requesting 16 permissions and is using 13 libraries.

Permissions

Your location

approximate (network-based) location, precise (GPS) location

Network communication

view network connections, pair with Bluetooth devices, full network access, Google Play billing service, Google Play license check

System tools

access Bluetooth settings, prevent phone from sleeping

Extra

android.permission.ACCESS_ADSERVICES_AD_ID, android.permission.ACCESS_ADSERVICES_ATTRIBUTION, android.permission.BLUETOOTH_CONNECT, android.permission.BLUETOOTH_SCAN, com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE, com.google.android.gms.permission.AD_ID, net.volcanomobile.fluidsynthmidi.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Ad network libraries

None found

Social libraries

None found

Development tools

Android Jetpack core

Android Architecture Components

Android Jetpack VersionedParcelable Android Jetpack Annotations Android Library Icon

Android Jetpack Annotations Firebase Android Library Icon

Firebase

Android Jetpack Widgets Android Jetpack AppCompat Android Library Icon

Android Jetpack AppCompat AndroidX Activity Android Library Icon

AndroidX Activity Android Activity Saved State Android Library Icon

Android Activity Saved State Kotlin Android Library Icon

Kotlin

AndroidX Widget ViewPager2 Google Protocol Buffers Android Library Icon

Google Protocol Buffers Jetpack Navigation Android Library Icon

Jetpack Navigation

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