PRICINGThe library is free. Reading your own stack is what you pay for.All 130 compounds, every evidence grade and every source stay open at both tiers. Pro is for when you want your whole stack compared, tracked and checked together.
FREE
$0forever
The whole reference library, plus one peptide from your own stack shown in full.
The full library — all 130 compounds, with every evidence grade
Mixing calculator, with the working shown
Cautions, contraindications and documented interactions
Dose log and injection-site record
One peptide from your stack shown in full, with what it is often stacked with
Comparing your peptides against each other
Bloodwork, cycle planning and Cortex answers
PRO
$14.99per month
FREE FOR ONE MONTH (NEW SUBSCRIBERS), THEN $14.99 MONTHLY · CANCEL ANY TIMEEvery peptide in your stack shown in full, compared against each other, and read against your bloodwork.
New subscribers: no card charged for a month. Cancel before it ends and you pay nothing — your stack stays, it just goes back to one resolved compound.
Every peptide in your stack shown in full, with no limit
Low-supply alerts across your whole stack — what runs out first, and when, against your cycle
Bloodwork: add your lab results and see which markers are outside range
Cycle planning, washout windows and adherence
Cortex answers that synthesise across your stack, not one compound at a time
Injection-site history and which site you have used least
Export a plain record to take to your physician
WHAT ONE COMPOUND ACTUALLY SHOWS YOUA single compound is not a single dot.Free shows one peptide from your stack in full — and still shows what it is often stacked with, including the rest of your stack, dimmed. You can see how your stack fits together before you pay anything.SOLID = SHOWN IN FULL · DASHED = IN YOUR STACK, LOCKED · FAINT = NOT IN YOUR STACK
NEVER BEHIND THE PAYWALLAnything that could hurt you if you got it wrong is free.Reconstitution arithmetic, cautions, contraindications and documented interactions stay readable at every tier, including for peptides that are locked on your plan. We will not put a dosing calculation behind a card form.
Why only one compound on Free?+
Because a trial that expires would have been the easy answer, and we wanted Free to still be worth opening after one ended. Free shows one peptide from your stack in full, and the rest of your stack still appears, dimmed, so you can see what you have. The Pro trial sits on top of that: a month with everything open, after which Free is still there rather than a locked door.
What happens to my data if I stop paying?+
Is any safety information behind the paywall?+
Does Cortex tell me what to take?+
Can I cancel whenever?+
Start with one peptide. Add the rest of your stack when you are ready.START MY STACK →
EDUCATIONAL RESEARCH REFERENCE · ADULTS 18+ · CORTEX DESCRIBES HOW COMPOUNDS ARE STUDIED; IT DOES NOT DIAGNOSE, TREAT OR PRESCRIBE · REVIEW EVERYTHING WITH A LICENSED PHYSICIAN