STL Tones is a music software company founded in 2016 that specializes in guitar and bass amp modeling plugins, tone-matching technology, and mixing tools. Originally born in Australia, the company is headquartered in Nashville, Tennessee, with a distributed team across the US, UK, and Europe. STL Tones has built its reputation in the heavy and modern rock production space, offering a suite of products centered around digital amp simulation and tone capture.

The company's flagship products include AmpHub, a comprehensive guitar and bass rig builder featuring dozens of amp, pedal, and cabinet models; ToneHub, a platform delivering thousands of signature tones crafted by professional producers and engineers; and ControlHub, an all-in-one mixing plugin with thousands of pre-built signal chains. STL Tones also offers Libra, an impulse response mixer, and the Emissary amp plugin bundle. Their proprietary Tracer technology allows users to digitally capture the sound of their own analog gear.

STL Tones is well known for its Tonality line of artist-signature guitar plugin suites, developed in collaboration with producers and players including Howard Benson, Wes Borland (Limp Bizkit), Will Putney, Andy James (Five Finger Death Punch), Josh Middleton (Architects, Sylosis), and Lasse Lammert. Each Tonality suite is built around the artist's personal amplifier, pedal, and cabinet configurations, targeting genres from modern metal to hard rock production.

STL Tones has 12 products cataloged on Equipboard, including Amp Simulator Plugins and Overdrive Effects Pedals. Their gear is featured by 6 artists, with the strongest followings in Rock and Metal. Notable users include Will Putney, Seb Barlow, and Andy James.