Guide
Design Systems
The Breakdown
Building
An Email Design System
Short answer
A Klaviyo email design system is a library of reusable, on-brand blocks, layouts and rules (headers, product modules, type, colour, buttons, footers) built inside Klaviyo, so every flow and campaign is assembled from the same parts. It makes emails consistent, faster to produce and easier to test. Most 7-figure brands should build one before redesigning individual emails.
What is an email design system?
Think of it as brand guidelines for your inbox, built into the tool you actually send from. Instead of designing every email as a one-off, you design the parts once:
Foundations: colours, type styles and fallback fonts, spacing, button styles, image ratios and dark-mode rules.
Blocks: hero sections, product grids, single-product spotlights, reviews and social proof, editorial or founder notes, offer banners, loyalty and subscription modules, and footers.
Layouts: a set of templates for each type of message: launch, promotion, newsletter or editorial, educational, and each core flow.
Rules: when to use which block, how many calls to action an email gets, how copy and imagery are paired, and what never changes.
In Klaviyo, those parts live as saved templates and universal content (saved blocks and sections), so publishing a change to a shared block, a footer for example, updates every email it’s linked to, including live flows and scheduled campaigns.
Why do brands need a design system instead of more templates?
Most brands don’t have an email design problem. They have a consistency problem. One campaign looks premium, the next looks rushed, and a flow built two years ago still uses the old logo and colours. Customers notice, even if they couldn’t tell you what’s wrong.
A design system fixes that in three ways:
Consistency. Every email, from the first welcome to a win-back a year later, feels like the same brand.
Speed. Campaigns are assembled from approved parts, so the team spends time on the idea and the offer rather than rebuilding layouts.
Learning. When every email uses the same blocks, you can test one block at a time and know what moved the result. With one-off designs, every email is a new variable.
That last point is the one most brands miss. A system turns design from taste into a decision you can measure.
What does a good Klaviyo design system include?
At minimum:
A master template with header, footer and spacing locked.
A block library covering every message type you send, including flows, not just campaigns.
Product modules that pull live product data, so prices and images stay current.
Mobile-first layouts. Design on a phone screen first and check desktop second.
Rules for imagery: what’s an image and what’s live text, so emails still make sense when images don’t load.
Documentation: a short guide showing which block to use when, and who approves changes.
Ownership: everything saved in your Klaviyo account, with source files in your own design tool.
For subscription brands, add blocks for upcoming shipments, skip or swap prompts and subscriber perks. For brands that sell one-time products, add cross-sell and “complete the set” modules that drive a second order.
How do you build one, step by step?
Here’s the order we’d follow:
Audit what you send today. Pull every live flow and the last few months of campaigns. List the blocks you actually use and where the brand breaks.
Start from your site and brand guidelines. Your emails should feel like your store. Reuse its colour, type feel and photography style.
Design the foundations, then the blocks. Design in Figma or your design tool, mobile first.
Build the blocks in Klaviyo and test rendering across the main inbox apps and dark mode.
Rebuild the highest-traffic flows first. Welcome, abandoned checkout and post-purchase are seen by the most people, so they show the system’s value fastest.
Move campaigns onto the system and retire old templates so nobody reaches for them.
Test one block at a time and fold winners back into the system.
Should you build it in-house, with a freelancer or with an agency?
It mostly comes down to who will own the system once it’s built:
In-house works if you have a designer who knows email’s constraints and someone who can build and QA in Klaviyo. The risk is that the system lives in one person’s head.
A freelancer works for a defined project if someone on your team owns the plan and will maintain the system afterwards. Confirm they build in Klaviyo, not just Figma.
An agency fits when you want the system designed, built and then actually used across flows and campaigns, with testing feeding it over time.
If you’re weighing agencies for this work, our shortlist of Klaviyo email design agencies compares the main options.
What mistakes should you avoid?
These are the ones we see most often:
Designing only campaigns. Flows run every day and are often seen by more customers than any single campaign.
One big image per email. It looks fine in a mockup and breaks when images are blocked or slow, and it hides your text from inbox apps.
Too many blocks. A system with fifty variations is a template graveyard. Fewer, better parts get used.
No owner. Someone must approve new blocks, or the system drifts back into one-offs within a few months.
How Swayleo approaches this
A design system is usually the first thing we build for a new brand, because everything after it gets faster and more measurable. We design it from your brand, build it in your Klaviyo account and rebuild your core flows on it first, so first-time buyers get a consistent experience from welcome to second order. Then campaigns move onto it, and our test results feed changes back in. You own all of it. We take design-only projects as well as full retention programs, so if you just need the system built, that works too. Learn more about how we work.
Talk to Swayleo
Want the founders to look at this for your brand? If you’re a 7-figure Shopify or DTC brand, book a strategy call.
Shopify & DTC brands
Quick Answers
Frequently
Asked Questions
What is a Klaviyo email design system?
It is a library of reusable, on-brand blocks, layouts and rules built inside Klaviyo, so every flow and campaign is assembled from the same consistent parts.
How is a design system different from a template?
A template is one finished layout. A design system is the set of parts and rules that every template is built from, so you can create new emails that still look and behave consistently.
Do I need a design system if I only send a few emails a month?
It still helps, because your flows run every day. Even a small system of a master template and a handful of blocks keeps automated and campaign emails consistent.
Can I build a design system with Klaviyo’s drag-and-drop editor?
Yes. Saved templates and universal content blocks let you build a working system in the editor. Some brands also use custom-coded templates for more control.
Who should own the design system?
One named person on your team or your agency should approve new blocks and changes, and all templates and source files should live in your own accounts.
Shopify & DTC brands