Pricing · 2026
Principia pricing
4 plans on the record · a free plan · a free trial
Every plan
Explorer
Free
always free
Tiers 1–2 · 15 concepts · guided walkthroughs · live visualizations · progress saved on device · Tiers 3–8 locked
Read 11 Oct 2026 · getprincipia.com
Principia Pro
$49.99 a year
per year; $4.17/month
8 tiers · 93 concepts
Read 22 Sep 2026 · getprincipia.com
Principia Pro Monthly
$6.99 a month
per month
All 8 tiers · 93 concepts · guided walkthroughs · printable study aids · future content included · cancel anytime
Read 11 Oct 2026 · getprincipia.com
Principia Pro Annual
$49.99 a year
per year · $4.17/month · Save 40% vs monthly
All 8 tiers · 93 concepts · guided walkthroughs · printable study aids · future content included · 7-day free trial
Read 11 Oct 2026 · getprincipia.com