Pricing
Principia pricing
As getprincipia.com lists them, read 11 Oct 2026. The maker's own page has the final word.
| Plan | Billed and limits | Price |
|---|---|---|
| Explorer | always free · Tiers 1–2 · 15 concepts · guided walkthroughs · live visualizations · progress saved on device · Tiers 3–8 locked | Free |
| Principia Pro | per year; $4.17/month · 8 tiers · 93 concepts | $49.99 a year |
| Principia Pro Annual | 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 | $49.99 a year |
| Principia Pro Monthly | per month · All 8 tiers · 93 concepts · guided walkthroughs · printable study aids · future content included · cancel anytime | $6.99 a month |
From getprincipia.com.