Simple pricing
The calculator is free, forever. Go Pro when you want to save your blends, sync them, and pull a spec sheet for the build.
Free
$0forever
- Race gas & E85 blend calculator
- Hit-a-target (octane / AFR) solver
- Injector sizing (lb/hr)
- Measured E85 ethanol input
Pro
$29/year
- Everything in Free
- Save unlimited blends + cloud sync
- Race fuel library (VP, Sunoco, more)
- Injector duty-cycle (IDC) validation
- Export a PDF spec sheet
Pro Lifetime
$49once
- Everything in Pro
- One payment, yours forever
Billing is in sandbox mode — test payments only.
14-day money-back guarantee — full refund within 14 days, no questions asked.
Billing & refunds
- Can I get a refund?
- Yes. We offer a 14-day money-back guarantee on every purchase — annual or lifetime. Request a full refund within 14 days, for any reason, and we'll issue it to your original payment method.
- Does the annual plan renew?
- The $29/year plan renews automatically each year. You can cancel anytime before the renewal date to avoid the next charge. The $49 lifetime plan is a one-time payment — no renewals.
- Who handles payment?
- Payments are processed by Paddle as our merchant of record. Paddle handles billing, receipts, and applicable taxes.
Payments handled by Paddle as merchant of record. Off-road / race use only.