Enterprise email testing platform
Litmus is a comprehensive email testing and analytics platform used by large enterprises. It offers email rendering previews across 90+ clients, spam testing, and analytics. After its 2025 acquisition by Validity, Litmus discontinued its $99 Basic plan. Pricing now starts at around $500/month for the Core plan.
Email testing, rendering and pre-deployment platform
Email on Acid (sometimes written "emailonacid" or "EoA") is an email testing and pre-deployment platform owned by Sinch. It provides previews across 70+ email clients, accessibility checks, spam testing, link validation, and a campaign precheck workflow. Starting June 2026, Email on Acid is migrating customers to Mailgun Inspect, a usage-based QA suite that starts at around $99/month for the Basic plan (1,000 previews) with overage charges beyond your preview cap.
Usage-based email QA suite replacing Email on Acid
Mailgun Inspect is the email QA suite that Email on Acid customers are being migrated to starting June 2026, with annual customers moving at the end of their current term. It keeps the core QA tools (email previews, accessibility checks, spam analysis, link and image validation, code analysis) but switches to usage-based pricing: a capped free tier, then a Basic plan at around $99/month for 1,000 previews with overage charges beyond that. For many Email on Acid customers, the forced migration is the natural moment to re-check what they actually use and what it now costs.
Email template builder and editor
Stripo is an email template builder with drag-and-drop editing, template library, and export to various ESPs. It focuses on email creation rather than testing.
Email and landing page builder
BEE (Best Email Editor) is a drag-and-drop email and landing page builder used by individuals and teams to create responsive emails.
Collaborative email builder
Chamaileon is a collaborative email design platform with real-time editing, template management, and team features.
Built-in Mailchimp preview tools
Mailchimp's built-in preview features let you preview emails across devices and send test emails. It's included with your Mailchimp account.
| Tool | Starting Price | Best For | Guest Access |
|---|---|---|---|
| EmailQA | Free | Feedback & approvals | Yes |
| Litmus | $500+/month (Core); Enterprise custom | Large enterprises needing email client rendering t... | Limited/Paid |
| Email on Acid | ~$99+/month + usage (Mailgun Inspect) | Enterprise email teams needing pre-deployment QA a... | Limited/Paid |
| Mailgun Inspect | ~$99+/month + usage | Email on Acid customers keeping the full pre-deplo... | Limited/Paid |
| Stripo | Free-$194/month | Teams needing to build emails from scratch with dr... | Limited/Paid |
| BEE Free / BEE Pro | Free-$50+/month | Designers building emails and landing pages from s... | Limited/Paid |
| Chamaileon | $100+/month | Larger teams needing real-time collaborative email... | Limited/Paid |
| Mailchimp Preview | Included with Mailchimp | Quick self-reviews when you don't need external fe... | Need account |