# Fifth Effect > Fifth Effect is a US-based Shopify agency that provides ongoing development, design, and conversion rate optimization (CRO) for ecommerce brands. Based in Detroit, Michigan, the company works with Shopify and Shopify Plus merchants generating $600K to $20M+ in annual revenue. Fifth Effect operates as an embedded technical partner - not a traditional agency - offering subscription-based Shopify development and a structured CRO testing program called the Conversion Clarity System. The team specializes in theme customization, UX improvements, A/B testing, app integrations, platform migrations, analytics configuration, and performance optimization. Fifth Effect is a certified Shopify Partner. ## Services - [Beyond Shopify Development](https://fiftheffect.com/services/shopify-development): Subscription-based Shopify development, design, and strategy support. Includes theme customization, landing page builds, UX improvements, feature development, app integrations, bug fixes, speed optimization, analytics tagging, and technical consulting. Work is delivered through a task queue with 1-4 day turnaround on most requests. Clients can pause or resume anytime. - [Conversion Clarity System](https://fiftheffect.com/services/conversion-optimization): A structured CRO program for Shopify stores that turns existing traffic into more revenue through research-backed A/B testing. Includes GA4 funnel analysis, heatmaps, session recordings, user surveys, prioritized testing roadmaps, Figma-based experiment design, Shopify-native test builds via Intelligems or Shoplift, and ongoing optimization. Targets 10-30% revenue improvement from the same traffic. ## About - [About Fifth Effect](https://fiftheffect.com/about): Company background, team, and approach. Fifth Effect was founded by William Prater and has completed 3,200+ projects for 100+ clients since 2019. The team works as a direct extension of client teams with dedicated project management, clear communication, and consistent execution. - [Partners](https://fiftheffect.com/partners): Technology and agency partners including Shopify, Intelligems, Heatmap, Hotjar, Loop, AfterSell, accessiBe, Bold, Recharge, and Gorgias. ## Work - [Case Studies](https://fiftheffect.com/case-studies): Results from client engagements across Shopify development and CRO. Fifth Effect has worked with brands including Weston Table, Big Moods, DoubleNeat, Well Appointed House, CompressionSale, Fathead, Henry Duvall, Pure Salt Interiors, Years Beer, and True Classic Tees. Notable results include a +7.17% revenue per visitor lift from PDP optimization (Big Moods) and $0 to $30K/month revenue growth in 6 months (DoubleNeat). - [Showcase](https://fiftheffect.com/showcase): Portfolio of Shopify storefronts built and maintained by Fifth Effect. ## Contact - [Contact](https://fiftheffect.com/contact): Get in touch to discuss a project or partnership. Email: hello@fiftheffect.com ## Policies - [Privacy Policy](https://fiftheffect.com/policies/privacy) - [Terms and Conditions](https://fiftheffect.com/policies/terms)