Pricing · 2026
Lean pricing
1 plan on the record · a free plan
Every plan
Lean 4
Free
Open-source programming language and proof assistant · no paid plans stated
Read 9 Oct 2026 · lean-lang.org
1 plan on the record · a free plan
Open-source programming language and proof assistant · no paid plans stated
Read 9 Oct 2026 · lean-lang.org