FluidSynth MIDI Synthesizer

2.0.35

Volcano Mobile SNC

3.93

1,088 reviews

100,000+
Downloads

Free

Turn your device into a FluidSynth synthesizer.

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Screenshots by Volcano Mobile SNC, from the Google Play listing

View on Google Play

AppBrain's verdict

Established

Rating on Google Play: 3.93; 1,088 ratings
Installs: 240 thousand
Last updated: October 28, 2025
Ads: No ads
Size: 15.2 MB

FluidSynth MIDI Synthesizer has 240 thousand installs. Users are divided: 3.9 stars from 1,088 ratings.

Official page on Google Play

Pros & Cons

FluidSynth-based synthesis for flexible MIDI sounds
SoundFont (.sf2) support for broad sonic options
MIDI hardware compatibility via USB OTG for real-time play
WAV recording of performances for easy sharing and editing
Open-source FluidSynth core provides transparency and community input

Requires external SoundFonts to function effectively; no built-in SoundFont bundled
Broad permission set (including location and ad IDs) may raise privacy considerations
No explicit on-screen keyboard or virtual instrument UI indicated in the data

User feedback

Ratings and reviews on Google Play

Comments on FluidSynth MIDI Synthesizer for Android

★★★★★ 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.

★★★★☆ 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

★★☆☆☆ 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

★☆☆☆☆ Lucax Lucax · Aug 28, 2026

When you just about to change the polyphony it doesn't work when I changed to 512 the audio crack so bad like my speaker it's broken it happened to 1024 and 2048 it's so annoying to changed to polyphony and suddenly some voices crack appear of nowhere you phone speak it's healty and not damaged what???

★★☆☆☆ 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 Rating history and histogram

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Store listing

By Volcano Mobile SNC, from Google Play

Description by Volcano Mobile SNC Written by the developer, not by AppBrain. Click to read.

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

Plug your device to your computer, or hook a MIDI USB master keyboard via an OTG cable to play with this low-latency FluidSynth 2.1.7 based Synthesizer.

- load SoundFont 2
- record your performances directly in WAVE files

This application uses a modified version of FluidSynth, you can find the source code here https://github.com/VolcanoMobile/fluidsynth-android

Safety and technology

Found in the app by AppBrain

Ads: No ads
Price: Free
Libraries: 15
App size: 15.2 MB
Needs Android: 6.0+
Content rating: Everyone

Technologies used by FluidSynth MIDI Synthesizer

16 permissions · 15 libraries

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Releases

Updates seen on Google Play

Version: 2.0.35
Launched: October 2016

Oct 28, 2025UpdateVersion 2.0.35
Jan 29, 2025UpdateVersion 2.0.32
Jul 7, 2024UpdateVersion 2.0.31
Sep 30, 2023UpdateVersion 2.0.30
Aug 19, 2023UpdateVersion 2.0.29

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Alternatives

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Alternatives to FluidSynth MIDI Synthesizer

Installs

Tracked by AppBrain

Last 30 days: 3 thousand
Per day: 100; 30-day average
Play install range: 100+ thousand
Launched: October 2016

Installs over time

FluidSynth MIDI Synthesizer has been installed 240 thousand times. Over the past 30 days, it averaged 100 installs per day.

Rankings

Google Play top charts

Google Play Rankings for FluidSynth MIDI Synthesizer

This app is not ranked

About the app and developer

About FluidSynth MIDI Synthesizer

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

Install Statistics

FluidSynth MIDI Synthesizer has been installed 240 thousand times. In the last 30 days, the app was installed 3 thousand times.

User Ratings

FluidSynth MIDI Synthesizer is rated 3.93 out of 5 stars. The rating is based on 1.1 thousand ratings.

App Information

FluidSynth MIDI Synthesizer is freely available from Google Play. The app size is 15.15 MB. The latest version available is 2.0.35. The last update was on October 28, 2025.

Technical Requirements

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 since October 2016.

FluidSynth MIDI Synthesizer is made and published by Volcano Mobile SNC. AppBrain is an independent app data site and isn't affiliated with Volcano Mobile SNC. The app name, icon, screenshots and description belong to Volcano Mobile SNC and are shown as published on Google Play.

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Developer information for Volcano Mobile SNC

Volcano Mobile SNC

contact@volcanomobile.net

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