Do all my Magento extensions need porting to Hyvä?

No. This is the #1 misconception about Hyvä. Three categories:

1. Extensions with an official Hyvä module (Amasty, Mageplaza, Yotpo, Klarna, Stripe, PayPal, Vertex, Klevu, Algolia, Mailchimp, BSS Commerce, Mirasvit, plus 50+ smaller vendors as of 2026). Drop in, configure, done. ~60% of typical extension stacks fall here. The calculator assumes ~0.2-0.5 weeks per extension in this bucket.
2. Extensions that work via the Hyvä Compatibility Module bridge. The compat module ships free with Hyvä Theme and renders the extension’s Luma frontend inside an iframe-like bridge. Works for: admin-only extensions (no storefront), email-only extensions, cron extensions, reporting extensions. ~25% of typical stacks. Zero porting work.
3. Extensions needing a full port. Storefront extensions with no Hyvä module and incompatible-with-bridge templates, usually custom mini-cart widgets, sticky-CTA bars, custom upsell components. ~15% of typical stacks. The calculator assumes 1-2 weeks per extension in this bucket.

The calculator’s third-party extensions count input applies an average over these three buckets weighted 60% / 25% / 15%, which matches what I’ve measured across 23 shipped migrations.