arc42 is completely free to use (and will remain so!), for arbitrary kinds of system, even in commercial context.
Please comply to our (liberal) license, though…
Prefer to learn arc42 hands-on?
Practical architecture training, most classes taught by Peter Hruschka and Gernot Starke — the people who created arc42 and maintain this FAQ (dates with other trainers say so) — and solid preparation for iSAQB certifications.
Next dates
- 15–17 Sep 2026 DE Req4Arc · Frankfurt/Maingetting your requirements right
- 29 Sep–1 Oct 2026 EN Mastering SW Architectures · onlineperfect preparation for iSAQB CPSA-Foundation certification · with Wolfgang Reimesch
- 27–28 Oct 2026 DE ADOC · Züricharchitecture documentation · with Gernot Starke
- 24–26 Nov 2026 DE IMPROVE · Hamburgevolve and maintain systems · with Carola Lilienthal & Gernot Starke
- 1–4 Dec 2026 DE Mastering SW Architectures · Münchenperfect preparation for iSAQB CPSA-Foundation certification
- 23–25 Feb 2027 EN Mastering SW Architectures · onlineperfect preparation for iSAQB CPSA-Foundation certification · with Wolfgang Reimesch
- 2–5 Mar 2027 DE Mastering SW Architectures · Münchenperfect preparation for iSAQB CPSA-Foundation certification
- 9–11 Mar 2027 DE Req4Arc · Münchengetting your requirements right
All courses and dates: trainings.arc42.org · as of 16 Aug 2026