Email & lifecycle analytics · Mailgun (Sinch)

Email on Acid

Pre-send email preview and QA tool priced by monthly preview volume, not a campaign analytics platform.

Visit Email on Acid Alternatives

Email on Acid, now sold as part of Mailgun's Inspect product line, is a pre-send email testing tool: it previews campaigns across 100+ email clients and devices, runs accessibility checks, HTML/code analysis, and link and image validation, and flags spam-trigger content before a send. Like Litmus, it's a QA step that sits before sending, not a place lifecycle or cohort analytics live — it has no revenue attribution or holdout testing, since it never sends the campaign itself. Pricing is by monthly preview volume rather than contacts or seats: Basic covers 1,000 previews a month, Premium covers 2,000 and adds accessibility, code-analysis and spam checks, and a Contract tier offers custom volume for larger teams; both published tiers include unlimited user seats and charge $0.15 per preview beyond the monthly allotment.

At a glance

Vendor Mailgun (Sinch)
Pricing model Subscription
Free tier No
Deployment Cloud
Open source No
Best for Email production teams needing volume-priced pre-send QA rather than campaign performance analytics.

Pricing

Priced by monthly email-preview volume rather than contacts or seats; unlimited users on every tier.

Plan Price Notes
Basic $99/month 1,000 previews/month, unlimited users, overage $0.15/preview
Premium $199/month 2,000 previews/month, adds accessibility tests, HTML analysis, spam checks
Contract custom custom preview allotment, same features as Premium

Prices read from the vendor's own page on September 21, 2026. Vendors change prices; check the source before you budget.

Features

  • Previews across 100+ clients and devices
  • Accessibility testing
  • HTML/code quality analysis
  • Link and image validation
  • Spam-content checks
  • Unlimited user seats on every plan
  • API access for automated QA

Integrations

Profile last reviewed September 21, 2026

Alternatives

Litmus Email rendering and pre-send QA tool that previews and checks campaigns across clients, not a lifecycle analytics platform. Twilio SendGrid Transactional and marketing email API priced by monthly send volume, with deliverability analytics but no journey-level holdout testing. Mailchimp Small-business marketing platform with basic subject-line A/B testing, priced by contact count with a permanent free tier.

Email on Acid in the index now

Terms to know

Incrementality testing An experiment measuring the true causal lift of a marketing activity by comparing it against a held-out control.

Related guides

How to choose an email marketing platform Pick an email and lifecycle platform by what triggers a send, whether it proves lift with a holdout, and how pricing scales with your list.