Tom'sline Engineering is a Chinese guitar effects brand operating under Aroma Music Co., Ltd., based in Huizhou, Guangdong. The company produces a broad catalog of compact, budget-priced stompboxes designed to deliver familiar effect voicings at a low entry point, and its pedals are often recognized by a patented protective bar that sits above the knobs to prevent accidental adjustment when the footswitch is stomped.

The lineup spans most common effect categories, including overdrive and distortion (e.g., the ABS-3 Bluesy, AGR-3 Greenizer, AVS-3 Vacuum Stack, and Holy War distortion), modulation (ACH-3 analog chorus, ATR-3 Twister flanger, ARE-3 Roto Engine), delay and reverb, acoustic simulation (AAS-3 AC Stage), tuners, and bass-focused tools such as a five-band bass EQ and bass limiter. The brand has also released a signature analog chorus developed with shred guitarist Michael Angelo Batio.

Tom'sline pedals are distributed through mainstream online retailers and independent shops worldwide, and the brand is frequently discussed in guitar communities alongside other affordable mini-pedal makers like Mooer, Donner, and Rowin. Its reputation is built around inexpensive clones and reinterpretations of classic circuits rather than boutique original designs.

Tom'sline has 36 products cataloged on Equipboard, including Overdrive Effects Pedals, Distortion Effects Pedals, and Equalizer Effects Pedals. Their gear is featured by 2 artists, with the strongest followings in Rock and Pop. Notable users include Esteban Espinoza and Elvis Nick. Most Tom'sline products sit on the budget-friendly end of the spectrum.