Retention Resources

Practical email marketing and retention guides from Thrivelia. UK-founded, with a hybrid team across London and Sofia. Compare agency partners, understand scope and pricing, audit your account and improve the customer journey.

Email marketing · Retention marketing · Klaviyo services · Client evidence

Agency comparisons

• 8 Best Email Marketing Agencies for Ecommerce (2026)

• 7 Best Retention Marketing Agencies for DTC Brands (2026)

• 6 Best Email Marketing Agencies for US Ecommerce Brands (2026)

• 5 Best Email Marketing Agencies for UK Ecommerce Brands (2026)

• 6 Best European Email Marketing Agencies for Ecommerce (2026)

• Thrivelia vs Competitors: Which Retention Agency Fits Your Brand?

• 8 Best Klaviyo Agencies for Ecommerce Brands (2026)

Pricing and hiring

• How Much Does an Email Marketing Agency Cost? A Scope-Based Buying Guide

• Klaviyo Agency vs In-House vs Freelancer: Which Model Fits Your Brand?

Industry guides

• Email Marketing for Fashion and Apparel Brands: From First Purchase to Repeat Customer

• Email Marketing for Footwear Brands: Fit, Product Adoption and the Next Pair

Frameworks and audits

• Klaviyo Audit Checklist: What to Check and Fix First

• Progressive Personalisation: How Customer Journeys Change After Each Purchase

• What Percentage of Ecommerce Revenue Should Come From Email?

• The Marketing Hourglass: An Eight-Stage Retention Framework

• First-to-Second Purchase Rate: How to Measure and Improve It

Original client evidence

Klaviyo flow efficiency: the perfectwhitetee example. Read the calculation, exact reporting periods and limits of the evidence.

Browse the latest articles and case studies below, or book a strategy call with our London and Sofia team.