We've just launched EmbedFAQ - check it out here

EXTFOX Logo
© 2026 EXTFOX

Shopify Plus themes thatconvert at scale

Custom themes and storefronts designed for Plus capabilities and high-volume traffic. For brands that need more than Online Store 2.0 can deliver out of the box.

Shopify Partner

Plus-first themes

PREMIUM COMMERCE

Built for conversion

REVENUE FOCUSED

High-volume ready

SCALE TESTED

Shopify clients

  • Clean Skin Club
  • The Honest Kitchen
  • Biorenewal
  • Eddi
  • Smilepen
  • BalkonStrom
  • Clean Skin Club
  • The Honest Kitchen
  • Biorenewal
  • Eddi
  • Smilepen
  • BalkonStrom

Plus brands and storefronts we've built.

Portfolio
Brand Logo
cleanskinclub.com

What we build

Plus storefronts that unlock enterprise commerce capabilities

We build custom themes and storefronts that leverage Shopify Plus features your business needs while maintaining the performance and conversion focus that drives revenue.

Custom theme development

Purpose-built themes designed around your catalog, customer journey, and brand requirements. Beyond Online Store 2.0 sections into custom Liquid, metafields, and performance optimization.

Theme optimization and conversion

Existing theme analysis, performance audits, and conversion optimization. Speed improvements, UX refinements, and checkout flow optimization that measurably increase revenue.

Plus customization and features

Checkout extensions, B2B customer portals, multi-market localization, and metaobject-powered product experiences. Plus capabilities integrated seamlessly into your storefront.

Our approach

How does a Plus storefront project work with us?

We start with your Plus capabilities and business requirements, then build themes that convert while scaling to your traffic and operational needs.

  1. 01

    1. Discover and audit

    We analyze your current theme, Plus features, and conversion bottlenecks. Clear requirements before any development starts.

  2. 02

    2. UX and conversion strategy

    Customer journey mapping, conversion optimization planning, and UX patterns that drive the metrics that matter for your business.

  3. 03

    3. Design system and Plus integration

    Component library, design tokens, and Plus feature integration plan. B2B, markets, checkout, and metaobject strategy locked before build.

  4. 04

    4. Theme development and Plus features

    Custom Liquid development with Plus capabilities integration. Performance-first architecture that handles your traffic and catalog complexity.

  5. 05

    5. QA and performance testing

    Cross-browser testing, performance audits, Plus feature validation, and conversion testing before launch.

  6. 06

    6. Launch and optimization

    Controlled deployment, performance monitoring, and post-launch conversion optimization based on real customer behavior data.

Fit

Do you need Plus-specific development?

We'll recommend staying with standard themes when Plus features aren't necessary. Plus development makes sense when you're using enterprise commerce capabilities.

Standard theme development works when

  • Your traffic and catalog fit Online Store limits

    Standard Shopify handles most businesses well. Plus makes sense when you need enterprise features, not just more traffic.

    Shopify development
  • You don't need B2B, markets, or custom checkout

    Plus features like B2B customer portals, international markets, and checkout extensions are the real value. Theme development alone doesn't require Plus.

  • Standard conversion optimization is enough

    Basic CRO and theme optimization can happen on any plan. Plus development pays off when you need the platform's enterprise capabilities.

    Headless storefronts

Plus storefront development makes sense when

  • You need B2B customer portals and wholesale

    Custom customer experiences, tiered pricing, and wholesale workflows require Plus capabilities and custom theme integration.

  • Multi-market and localization are core to growth

    International expansion with proper currency, language, and regional customization needs Plus markets and custom theme architecture.

  • Checkout customization drives your conversion strategy

    Upsells, custom fields, and conversion optimization in checkout require Plus extensions integrated with your theme experience.

Engagement

How can we work on your Plus storefront together?

Whether you need a custom theme from scratch, optimization of an existing storefront, or Plus-specific customization, we have engagement shapes that fit.

Custom theme development

From $5,000 USD

Fixed scope and price, agreed before we start.

Who it is for

For Plus brands that need a custom theme built around their catalog, customer experience, and business requirements. When existing themes don't match your conversion or Plus feature needs.

What is included

  • Discovery, UX strategy, and conversion-focused design
  • Custom theme development with Plus feature integration
  • Performance optimization, QA, and launch support

How it ends

Ends with a live theme optimized for your Plus capabilities and a handover your team can manage.

Theme optimization

From $5,000 USD

Scoped to specific performance and conversion improvements needed.

Who it is for

For stores with existing themes that need performance improvements, conversion optimization, or Plus feature integration without a complete rebuild.

What is included

  • Theme audit, performance analysis, and conversion bottleneck identification
  • Speed optimization, UX improvements, and Plus feature integration
  • A/B testing setup and post-optimization performance tracking

How it ends

Results in measurable performance and conversion improvements with clear before/after metrics.

Plus customization retainer

From $2,500 per month USD

Ongoing Plus features, optimization, and support. We suggest three months minimum for meaningful results.

Who it is for

For teams that need ongoing Plus development, checkout extensions, B2B features, and continuous conversion optimization.

What is included

  • Sprint planning focused on Plus capabilities and revenue goals
  • Checkout extensions, B2B portal development, and market expansion features
  • Performance monitoring, conversion optimization, and rapid deployment of improvements

How it ends

Runs as an ongoing partnership with documented releases and clear ROI measurement.

Not sure which engagement fits? Book a meeting with the team.

We build on the Shopify apps you already trust.

We partner with best‑in‑class Shopify apps to extend your store with CRO, personalization, subscriptions, loyalty, and search experiences.

Replo
Intelligems
EmbedFAQ
Yotpo
Klaviyo
Loox
Stay.ai
Recharge
Shopify Search & Discovery
Smile
Rebuy
PageFly
Dusan Jovanovski, Founder at EXTFOX

Let's meet

Looking to scale revenue on Shopify? You'll book directly with Dusan J., Founder at EXTFOX, to discuss your store, opportunities, and next steps.

Tell us about your store

Pick a time that works for you. You'll get instant confirmation and a calendar invite.

Prefer to call? (862) 259-6969

FAQ

Plus themes can leverage enterprise features like checkout customization, B2B customer portals, multi-market capabilities, and advanced metaobject integration. They're built to handle higher traffic volumes, complex catalogs, and business workflows that standard themes can't support. Plus also removes many API limitations, allowing for more sophisticated integrations and customizations.

Plus themes work when you need enterprise commerce features but Liquid templates still cover your UX requirements. Headless makes sense when your frontend needs completely custom interactions that Liquid can't deliver. Plus themes are faster to market and easier to maintain, while headless offers unlimited frontend flexibility at higher complexity and cost.

Yes. We build custom B2B experiences integrated into Plus themes, including tiered pricing displays, wholesale catalogs, custom ordering workflows, and account management portals. These leverage Plus B2B features while maintaining a seamless brand experience throughout the customer journey.

Plus theme optimization includes strategic Liquid caching, efficient API usage, image optimization, critical CSS extraction, and performance budgeting. We build themes that leverage Plus's higher API limits while implementing caching strategies that keep page load times fast during traffic spikes and product launches.

Plus themes can be designed to complement checkout extensions by maintaining consistent styling, passing relevant data to checkout, and creating smooth handoffs between storefront and checkout experiences. We ensure your theme and checkout extensions work together as a cohesive customer journey.

Yes. We build Plus themes with proper internationalization, multi-currency display, region-specific content, and localized checkout flows. This includes currency conversion, language switching, regional product catalogs, and compliance with local commerce requirements across different markets.