Design Studio Overview
Design Studio is the editor used to create branded, responsive emails (and in-app messages) inside Customer.io.
Design Studio gives you a flexible way to design professional messages while maintaining brand consistency across your workspace.

What You Can Do in Design Studio
With Design Studio, you can:
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Build emails using a drag-and-drop visual editor
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Switch to a code editor to edit HTML/CSS directly
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Create and reuse content blocks
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Apply global brand styles
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Preview messages across devices and accessibility modes
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Send test messages and collaborate with teammates
Access depends on your workspace role:
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Admins & Authors: full editing access
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Viewers: read-only access
Visual Editor vs Code Editor
Every email includes two editing modes:
Visual Editor
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Drag-and-drop components
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Style content from the sidebar
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Insert personalization (Liquid)
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Best option for building emails from scratch
Code Editor
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Edit HTML/CSS directly
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Useful for importing existing templates
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Includes developer tools for validation and accessibility checks
If you’re unsure which to use, start with the visual editor.
Reusable Components
To keep emails consistent and scalable, you can use:
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Standard components (headings, text blocks, buttons, columns, etc.)
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Custom components (your own reusable blocks)
Reusable components help maintain brand alignment and speed up production.
Global Styles
You can define workspace-wide styles for:
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Fonts
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Colors
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Buttons
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Spacing
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Border radii
Once set, emails automatically inherit these styles — keeping branding consistent without manual formatting in every message.
Localization
Design Studio supports multi-language emails.
To localize:
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Store language preference as a person attribute.
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Add translated versions inside the email.
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Select which language attribute to use.
You can also use AI-powered translation to generate language variants.
Preview & Testing Tools
Before sending, you can preview:
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Desktop vs mobile
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Light vs dark mode
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Images blocked
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Accessibility views (e.g., color blindness)
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Personalized data rendering
You can also:
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Send test emails
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Share drafts with teammates
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Manage versions
Note: Only one person can actively edit a Design Studio message at a time.
Connecting to Campaigns
A Design Studio email must be connected to:
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A campaign
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A broadcast
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A transactional message
After making edits, you must publish changes for updates to take effect.