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Email on Acid

QA your email before it hits inboxes

Deliverability
For AI agents
APICapable readiness
About

What is Email on Acid

Email on Acid runs pre-send quality checks on email campaigns — rendering previews across 100+ clients and devices, spam filter analysis, link and image validation, and WCAG-based accessibility checks. It's built for marketing teams and GTM engineers at SMBs and mid-market companies who send frequently enough that broken emails are a real cost. The standout capability is WCAG accessibility checking, which most email tools skip entirely and which matters increasingly for compliance-conscious senders. The API and Zapier integration mean preview workflows can be automated into existing CI or campaign pipelines without manual intervention. That said, Email on Acid is a QA layer, not a sending platform — if you need inbox placement data at scale or deep deliverability diagnostics beyond spam filter checks, you'll need to pair it with a dedicated deliverability tool.

Deliverability
Capabilities

Key features

Deliverability infrastructure

warmup, spam tests, and sender reputation

No-code automation support

works with major iPaaS platforms

Our verdict

Vanderbuild take

For marketing teams and GTM engineers who send campaigns at any real volume, Email on Acid fills a specific gap: catching rendering failures, broken links, and spam triggers before they reach subscribers. The REST API is live and documented — you can wrap it into your own MCP layer or CI pipeline cleanly, making it a reasonable candidate for agentic pre-send QA automation when you're ready to go there. At $99/mo to start on a workspace model, it's affordable for small teams, though preview volume caps mean you'll likely upgrade as send frequency grows. The honest limitation is scope: this is a pre-send QA tool, not a full deliverability suite — inbox placement monitoring, reputation tracking, and seed list testing aren't part of the picture here.

Mateusz Sekta
Founder, vanderbuild
Learn more

Our Resources

The wedge

Agentic stack profile

API
REST

Programmatic access available.

REST API — straightforward to call from any agent or workflow tool. Rate limits and auth vary by plan.

API docs →
Agentic readiness
Capable

Solid API access — wraps cleanly for agent use.

Solid REST or SDK access. No MCP server yet, but easy to wrap in custom agent tooling. Most modern SaaS tools land here.

Stack role
Deliverability

Where this tool slots into an agentic pipeline.

Plays the role of Deliverability in an agentic pipeline. Use it to keep email sending reputation healthy — warmup, spam tests.

Compare

Email on Acid alternatives

Tools that solve a similar problem — compared at a glance.

Email on Acid(this tool)
Pricing
Workspace-based
Budget
$$
Best for
Marketing, GTM Engineer
Readiness
Capable
API
REST
Zapmail
Pricing
Client-based
Budget
$$
Best for
SDR / BDR, Agency
Readiness
Capable
API
REST
Zerobounce
Pricing
Freemium
Budget
$$
Best for
RevOps, GTM Engineer
Readiness
Capable
API
REST
Answers

Frequently asked questions

Does Email on Acid have a public API?

Yes — Email on Acid ships a REST API. Docs: https://api.emailonacid.com/docs/latest.

How much does Email on Acid cost?

Email on Acid: pricing is workspace-based, expect mid tier ($$) spend. Full pricing page: https://www.emailonacid.com/pricing/.

Who is Email on Acid best for?

Email on Acid is built for Marketing, GTM Engineer. Fits SMB (1-50), Mid-market (50-500)-sized teams.

How well does Email on Acid fit an agentic sales stack?

Tier: Capable. Solid public API, no MCP yet — straightforward to wrap in your own agent tooling.