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AmpMe — an app that can create makeshift sound systems by syncing smartphones and tablet devices together — is adding Bluetooth speakers to the mix.

To make it work, the Montreal, Canada-based startup has amassed a custom-built database that calculates the individual latency of more than 100 of the most popular Bluetooth speakers from major manufacturers.

AmpMe’s “predictive sync” technology uses machine learning to detect and correct tiny playback delays created by software from various makes and models of portable devices.

The result: a random collection of Apple or Android smartphones, tablets and Bluetooth speakers can be linked to create a surprisingly big sound inside a dorm room, at a picnic or on the beach.

“We’ve built a sound system for the 99 percent,” AmpMe Chief Executive Martin-Luc Archambault says, calling the addition of Bluetooth speakers to AmpMe’s database “the most democratizing step we’ve taken” to enable free, on-the-fly audio experiences.

The number of devices that can by synced together through AmpMe is unlimited, but the number of music apps that it uses is currently limited to your personal music library, SoundCloud and YouTube. More streaming services are coming “soon,” according to Archambault.

AmpMe said Thursday the app has now been downloaded over 3 million times since its launch in September 2015, and is now available in 144 countries.

AmpMe has raised $10 million from investors including Relay Ventures and Investissement Quebec.