C3 Professional CAD

Purchase Options

How to Buy

Four Ways to Purchase C3

C3 is sold direct from Tetra720. Pick whichever payment method works best for you — license keys delivered by email, usually within one business day.

Credit Card

Fastest way to buy — checkout now

Visa, Mastercard, Amex, or Apple Pay — secure checkout hosted by Stripe. Your signed license file is delivered by email the same day, usually within hours.

Pay with Card — $1,995 →

PayPal

From balance or linked card

Pay from your PayPal balance or any card linked to your PayPal account. License key delivered within one business day.

Buy now with PayPal →

Wire / ACH / Zelle

Common for B2B purchases

Email us and we’ll send routing details for your accounting department. License key delivered after payment confirmation.

Email for instructions →

Purchase Order

NET-30 (eligibility below)

Standard NET-30 terms with a 2% discount if paid within 10 days. Email us with your PO and we’ll process it the same business day.

Email with your PO →

Purchase Order Acceptance Policy

Tetra720 accepts purchase orders from:

  • Publicly traded companies (NYSE / NASDAQ / OTC listed)
  • United States federal and state government agencies
  • Accredited colleges and universities
  • Major aerospace, defense, and engineering firms

Standard terms: NET-30, with a 2% discount if paid within 10 days. All other customers are welcome to purchase via credit card, PayPal, wire transfer, ACH, or Zelle — license delivered just as fast.

Every purchase is fulfilled personally by John Christy. You’ll receive your license key, a personal welcome, and direct contact for any questions afterward. The CADD/200-300 tradition, modernized.

CADD/200-300 Alumni — $995

Launch-window pricing for verified former Tensegrity CADD/200-300 customers. Same perpetual license, half off, in recognition of the original community that built this lineage. Contact us to verify and order.

Educational — $295

Verified students and faculty at accredited institutions. Same perpetual license, full feature set, no commercial-use restriction in coursework. Contact us with proof of status.

Multi-Seat & Site Licenses

Engineering teams, departments, and site-wide deployments. Volume pricing, purchase orders, and NET-30 terms available. Contact us for a quote.

Built to outlast any vendor — including us

  • Your license is a signed file you own — not a tether to one machine. Back it up like any document; if you upgrade Macs or a machine dies, copy it to the new one and keep working. No activation, no server, nothing to break.
  • Your drawings are stored in an open, documented, human-readable JSON format — readable in any text editor, parseable by any programmer, decades from now.
  • Industry-standard DXF and DWG export is built in — your work can move to any other CAD system, any time you choose.
  • No cloud dependency. The application, your files, and your license never need an internet connection.