Design Emails That Look Great Everywhere
Preview your email templates instantly. See exactly how they'll render before sending to real users.
Get Started FreeEmail design is unpredictable
Rendering differences
Gmail, Outlook, Apple Mail - they all render HTML differently. What looks great in one breaks in another.
Mobile responsiveness
Most emails are read on mobile. Is your design responsive? Hard to tell without testing.
Images and links
Are your images loading? Are links correct? You won't know until you see the actual email.
Slow iteration
Tweaking CSS, sending test email, checking inbox. Repeat 50 times. Design takes forever.
How InboxSim Helps
See your emails instantly in a clean preview. Iterate faster with immediate feedback.
Beautiful HTML preview
See exactly how your email will render. Clean interface with no distractions.
Source code view
Inspect the raw HTML. Debug styling issues at the code level.
Instant updates
Make a change, send a test email, see results in seconds. Rapid iteration.
Everything you need for email design
HTML / Plain text toggle
Switch between HTML and plain text views instantly. Ensure both versions look good.
Attachment preview
See attached files and images. Verify everything is included correctly.
Email headers
Check From, Reply-To, Subject and other headers. Ensure metadata is correct.
Share for review
Get feedback from designers and stakeholders. Share a link, they see the email.
Iterate faster
No more sending emails to yourself and digging through your inbox. The feedback loop is instant.
Ready to ship emails with confidence?
Join developers who trust InboxSim for email testing.