Bastl Instruments is an independent electronic instrument maker based in Brno, Czech Republic. Founded in 2013 by Václav Peloušek and Ondřej Merta — who had previously collaborated under the Standuino name starting in 2011 — the company designs and manufactures portable synthesizers, Eurorack modules, samplers, mixers, and studio utilities with a strong DIY and open-source ethos. Many of their products are hand-assembled in-house, and the company is closely tied to a wider community of workshops, events, and a small record label.

The brand is known for compact, character-driven instruments such as the Kastle pocket synth and its Kastle 2 successors (Alchemist, Wave Bard, FX Wizard), the microGranny granular sampler, the Softpop and Softpop SP2 semi-modular synths, the Thyme and Thyme+ effects processors, the Trinity modular groovebox, and a range of Eurorack modules and skiff cases. Their aesthetic favors wooden side panels, hand-drawn graphics, and unconventional patching workflows that lean into experimentation and noise as much as conventional musicality.

Bastl also operates the Noise Kitchen retail and community space and has collaborated with builders such as Casper Electronics on co-designed modules. The company occupies a niche between boutique synth maker and experimental tool builder, with a reputation in the modular and electronic music community for instruments that prioritize playful sound design over polished presets.

Bastl Instruments has 55 products cataloged on Equipboard, including Modular Synthesizers, Synthesizers, and Audio Samplers. Their gear is featured by 13 artists, with the strongest followings in Electronic, Pop, and Jazz. Notable users include Andrew Huang, Jason Nazary, and Dijon. Bastl Instruments's catalog spans the full price spectrum — from entry-level options to high-end flagships.