Build, preview, test, and share bulletproof HTML emails. Powered by AI and built for developers & modern email marketers. Generate templates, check live renders across Gmail, Outlook, iPhone, Android, Yahoo Mail, and dark mode, collaborate with your team, and ship emails that just work ™ in every email client.
Trusted by teams testing email at speed
Start from a prompt to get a beautiful, responsive HTML email template instantly. Edit in the code editor, preview across devices and dark mode, check live renders in Gmail, Outlook, iPhone, Android, and Yahoo Mail, then export production-ready HTML. No clunky drag-and-drop builder required.
A developer-friendly editor with syntax highlighting, auto-complete, line numbers, word wrap, and auto-save. Choose spaces or tabs. We won’t judge.
Automatically inlines and optimizes your CSS for maximum email client compatibility. Stop manually debugging broken layouts. Postdrop helps your HTML emails render correctly in Gmail, Outlook, Apple Mail, Yahoo, and beyond.
Preview how your HTML email template looks on desktop and mobile, in both light and dark mode, all without sending a single test email. Then check live client renders in Gmail, Outlook, iPhone, Android, and Yahoo Mail. Share preview links with your team or clients instantly, no screenshots required.
Generate live previews across popular email clients including Gmail, Outlook, iPhone, Android, Yahoo Mail, and dark mode before you send. Catch rendering issues early, share results with your team, and send every campaign with more confidence.
Invite your whole team. Designers, marketers, and developers can work together in one shared workspace.
Set your logo, company name, and brand color once. Every new template uses your approved branding automatically. Consistent, every time.
Upload, store, and serve images via Postdrop’s global CDN for lightning-fast delivery.
Download or paste your email into Mailchimp, Campaign Monitor, HubSpot, Klaviyo, Customer.io, OneSignal, Mailgun, SendGrid, and more.
Send test emails directly from the editor to any inbox. See exactly how your HTML renders in Gmail, Outlook, Apple Mail, and more before your campaign goes live, then compare that with live client renders across iPhone, Android, Yahoo Mail, and dark mode. Share test emails with your team or clients, then export to your ESP when you're ready.
Start with a prompt or template: AI generates your base design.
Refine in the editor: tweak HTML, upload images, adjust styles.
Preview, share, and export: test across devices and export ready-to-send HTML.
Designers, developers, and marketers spend hours fixing inconsistent HTML, broken layouts, and dark-mode bugs. Postdrop helps you check live renders across Gmail, Outlook, iPhone, Android, Yahoo Mail, and dark mode before you send.
$0 / mth
$29 / mth
$79 / mth
Custom
Postdrop was built by experienced product and design leaders who’ve spent years working with email, messaging, and developer tools. Our founders have over 20 years’ experience in software development, working in the San Francisco Bay Area for successful messaging companies including Mailgun and OneSignal, and open-sourcing email tools for developers with one of the most popular projects on GitHub with over 20,000 stars.
