Pay once, or don’t pay at all
Both tools are free and complete — all 2 of them, every model, every statistic, your own data, and exports at publication resolution. The only thing a licence changes is the small credit line on a downloaded figure.
Free
$0forever
Both tools, every statistic, no account. Exports carry a small credit line.
Pro
One-time$49one-time
Pay once. Clean exports, for as long as the files exist.
Payments are not live yet
Checkout is not set up, so there is deliberately no button here rather than one that goes nowhere. If you want a licence now, write to help@assayplot.com and one will be issued by hand.
What differs
| Feature | Free | Pro |
|---|---|---|
| Both analysis tools, in full | Yes | Yes |
| Every model, statistic and confidence interval | Yes | Yes |
| Your own data, any number of groups | Yes | Yes |
| SVG and 600 dpi PNG export | Yes | Yes |
| Computation stays in your browser | Yes | Yes |
| Account required | No | No |
| Credit line on exported figures | One small grey line | None |
One row differs. That is the whole model — see the terms for the refund policy, which is “write in and you get your money back”.
Already have a licence key?
Paste it here. It is verified on this device using a public key built into the page — no request is made, and nothing is sent anywhere.
Lost it? It was emailed to the address you paid with, under the subject “Your AssayPlot licence key”. We keep no copy of your key, so that email and the activation address you landed on after paying are the whole record.
Why this costs so much less
Because it does far less. GraphPad Prism costs $271 per seat, per year and is a whole statistics package with a data-management layer, dozens of tests, a support organisation and a validation dossier a regulated lab can cite. If you need that, it is worth the money and this is not a substitute for it.
This is two analyses. There is no server doing the computation, no storage, no accounts to administer and no per-seat accounting, so the marginal cost of another user is genuinely zero — which is why the free tier is not a trial and has no usage cap. The licence exists so that people who put these figures in print can fund the thing for people who cannot.
The comparison price is a list price for an academic single seat and it moves. It is recorded in the source alongside the date it was last checked, and it is never rounded up.