Spell
The Hero Spell
Conjure a hero section that converts on first scroll.
4.8(312)7 Moon Tokens
CRO Training ShopCast your first experiment.
Cast your first experiment.
Ship your first spell.
A training ground for CRO developers — dressed in witchcraft.
Featured spells
Hand-picked from the grimoire.
Artifact
MutationObserver Orb
Watch the DOM. Strike when the node appears.
4.8(311)15 Moon Tokens
Artifact
Personalisation Prism
Split your audience. Speak to each segment in turn.
4.7(165)14 Moon Tokens
✦ 200+ A/B tests shipped✦ 60+ developers mentored✦ Spoken at Moldova DevCon✦ Built by a working CRO engineer✦ Featured at Startup Moldova Summit✦ Webtrends Optimize ready✦ 200+ A/B tests shipped✦ 60+ developers mentored✦ Spoken at Moldova DevCon✦ Built by a working CRO engineer✦ Featured at Startup Moldova Summit✦ Webtrends Optimize ready
A shop you can experiment on
Every button, badge and card on this site carries a stable data-test attribute. The shop is intentionally testable — bring your A/B tool and start writing variants.
A lab to learn the craft
The Lab walks you through CRO development from your first selector to reading results. Each lesson points back to a real surface on this shop you can practise on.
From the Lab
Three lessons to begin with.
Beginner · 6 min
What is CRO Development?
A practical introduction to the role of a CRO developer — what we build, why it differs from product engineering, and how experiments earn their keep.
Read lesson →Beginner · 8 minAnatomy of an A/B Test
From hypothesis to readout: every test has the same skeleton. Learn it once and you can run them anywhere.
Read lesson →Beginner · 9 minInstalling Webtrends Optimize
How the WTO snippet works, where it goes, and why placement matters for performance and flicker.
Read lesson →