Tools · free, nothing to install
Four tools, free and open to anyone: a readiness check, an annotated certificate, each state’s testing rules, and a potency trace read peak by peak.
ToolsFree · no sign-up
ISO/IEC 17025:2017 · two minutes
Ten yes, partly or no questions, each tied to the clause an assessor checks. You get a score, the gaps in plain words, and the work that closes each one.
For lab directors and QA managers with an assessment on the calendar.
Ten questions, about two minutes. Your answers stay in your browser.
Certificate of analysis · twelve notes
A sample certificate for a fictional flower batch, annotated section by section: ND against <LOQ, total THC arithmetic, dry-weight basis, and limits that change at the state line.
For labs checking their own certificates, and buyers reading someone else’s.
A fictional flower certificate, explained in 12 notes: ND against <LOQ, the 0.877 arithmetic, and limits that change at the state line.
Open the COA explorer →50 states and DC
Each state’s cannabis testing rules and the regulator behind them, with the date we last checked.
For labs entering a new state, and anyone comparing limits across state lines.
Explore your state’s rules →Map of the 51 states and DC by cannabis program: adult-use, 25; medical, 16; limited medical (low-thc or cbd only), 2; no medical or adult-use program, 8; not yet known, 0.
HPLC-UV potency · a demo
A potency chromatogram of THC-dominant flower that draws itself. Point at any peak for what it tells a lab: the 0.877 factor, the Δ9/Δ8 critical pair, what a growing CBN peak means.
For analysts, and anyone who has only ever seen the certificate.
Read the trace →Twelve cannabinoids, in the order a C18 column separates them. Select one to read what its peak tells a lab, or read all twelve →
CBDVA cannabidivarinic acid · 1.88 min · not detected
First cannabinoid off the column. Usually absent in THC flower. When it is present, its peak has to clear the solvent front before anyone can quantify it.
CBDV cannabidivarin · 2.09 min · not detected
The neutral form of CBDVA. Not detected here, which is normal for THC-dominant flower.
CBDA cannabidiolic acid · 2.59 min · quantified
The acid form of CBD, so total CBD = CBD + 0.877 × CBDA. A small peak in THC flower; on hemp it is the headline.
CBGA cannabigerolic acid · 2.75 min · quantified
The precursor the plant makes THCA, CBDA and CBCA from. Often the second-largest peak in THC flower.
CBG cannabigerol · 2.91 min · quantified
CBGA after decarboxylation. CBDA, CBGA, CBG and CBD elute within half a minute of each other, so a small drift in the mobile phase can merge them.
CBD cannabidiol · 3.08 min · below LOQ
Near zero in THC-dominant flower. The peak is there, but its signal-to-noise is below the limit of quantitation, so the certificate reports <LOQ.
THCV tetrahydrocannabivarin · 3.39 min · below LOQ
The propyl cousin of Δ9‑THC. Its shorter side chain holds less tightly to C18, so it elutes more than two minutes before Δ9‑THC.
CBN cannabinol · 4.61 min · quantified
Forms as THC oxidizes. A growing CBN peak says the sample is old, or was stored warm or in light.
Δ9-THC delta-9-tetrahydrocannabinol · 5.82 min · quantified
The regulated compound. Fresh flower carries little; most of it forms when THCA is heated. Δ8‑THC elutes 0.18 min later, and the method has to keep the two apart.
Δ8-THC delta-8-tetrahydrocannabinol · 6.00 min · not detected
Not detected here. Δ8 and Δ9 differ only in where one double bond sits. That makes them a critical pair: a method that cannot resolve them reports one as the other.
CBC cannabichromene · 7.26 min · quantified
Minor in most flower. It elutes 0.35 min before THCA, the largest peak in the run, so an overloaded THCA peak can swallow it.
THCA tetrahydrocannabinolic acid · 7.61 min · quantified
The dominant peak in THC flower. Heat turns it into Δ9‑THC, so labs report total THC = Δ9‑THC + 0.877 × THCA. The 0.877 is the ratio of their molecular weights (314.5 / 358.5).
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