We design, build, test, and deploy custom checkout, shipping, payment, discount, and validation logic that standard apps can't handle — for merchants and agencies. Also: Scripts stopped running June 30, 2026. Rushed migrations often broke things silently.
Each engagement is fixed-scope. No open-ended retainers to start, no "let's hop on a call to figure out pricing."
Complex checkout, shipping, payment, discount, and validation logic — chained conditions, not a single toggle.
# 1–3 weeks depending on complexity · priced after we review your requirement
Request a custom rule →We review one store and tell you exactly what's broken since the Scripts shutdown.
# written report, severity-ranked. No commitment beyond it.
Book an audit →We rebuild your Scripts logic as native Shopify Functions, tested before deploy.
# docs + exported config included
Get a quote → See the full process →Rule changes, new rules, and monitoring — one flat monthly rate.
# the natural end state once requests turn monthly
Talk to us →One point of contact for every client store, not a new vendor relationship per client. Become a design partner and we migrate your first client store free — the rules we build become reusable Rulic config you deploy to the next client yourself. That's the whole idea: service work today becomes product you self-serve tomorrow.
Every rule compiles to a native Function running inside Shopify's WASM sandbox, with hard technical ceilings most teams discover in production — usually the hard way. We design around them from day one, on every custom rule, audit, and migration.
These aren't edge cases — they're the reason a Scripts-to-Functions port isn't a copy-paste job. A rule that worked fine on Scripts can fail outright once it's a Function, if nobody accounts for these.
Some requirements outgrow "a rule" — genuinely custom Rust, a full architecture pass before a Plus build, or a program that has to run consistently across a whole portfolio. Four engagements for that:
Logic that goes beyond what rules can express, architected and built as a native Shopify Function, end to end.
Learn more → implementation / 02The full migration process — audit, mapping, rebuild, side-by-side verification, staged cutover.
Learn more → implementation / 03Get the data model and extensibility strategy right before your team starts building.
Learn more → implementation / 04Multi-store, multi-market B2B programs, scoped once and rolled out store by store.
Learn more →Scripts migration demand won't stay this high forever — that wave clears within a few quarters. Custom rules don't expire: every rule we build, whether from an audit fix or a migration, ships back as portable Rulic configuration you reuse yourself, for as long as you're running Shopify checkout logic.
Know the rule you need? Request it — from €750, priced after we review it. Think something's broken from a Scripts migration? Start with the audit instead. Either way, tell us what you're running and we'll tell you plainly what it needs.
Need a full migration, a retainer, or something bigger? Tell us what you're building.