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Building

We never stop.

Every update is a step toward the companion we wish existed. Here's what's new.

NewFlow

Invoicing, beyond Germany.

Particle's invoice engine started where it had to start: certified for German VAT law. Stornorechnung, Kleinunternehmer, reverse charge, OSS — every Pflichtangabe on every invoice, audit-ready for a Finanzamt review.

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April 2026

New

Thinking in series

Our Thinking section now supports series — connected articles with a timeline landing page and prev/next navigation.

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March 2026

New

The science behind the sound

Three new research articles on our blog: why focus music should never loop, the truth about brown noise, and the frequencies your brain hates.

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