Email on Acid
Email testing and validation platform for pre-send campaign quality assurance
- Also known as
- email-on-acid
Available worldwide · Popular in: US
What is Email on Acid?
Tests email campaigns across 100+ email clients and devices to identify rendering issues, validate content for inbox compatibility, check accessibility compliance, and detect deliverability problems before sending.
Email on Acid pricing
Plans, per-tier features and add-ons, dated and linked to live pricing. Pricing changes often; always verify at source before you rely on it.
From $99/month. 7-day free trial.
Basic
Email preview testing with API access
- previews
- 1,000/mo
- clients_devices
- 100+
- 1,000 email previews per month
- 100+ email preview clients and devices
- Unlimited users
- API access
- Overage charges for additional previews
Premium
Full QA suite with accessibility testing and content analysis
- previews
- 2,000/mo
- clients_devices
- 100+
- 2,000 email previews per month
- 100+ email preview clients and devices
- Unlimited users
- Accessibility tests (WCAG 2.2 / European Accessibility Act compliance)
- HTML code analysis
- Link and image validation
- Spam content checks across major ISPs
Custom
Contact salesCustom preview allotments and enterprise support
- Custom preview allotments
- Phone and chat support
- Dedicated support documentation
What Email on Acid does
The capabilities that matter for email testing dev, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- API assertions
- ✓
- Rendering preview
- ✓
- Spam score check
- ✓
- Blocklist deliverability check
- ✓
- SMS testing
- ✗
- Production sending addon
- ✗
- Ci cd integration
- ✗
- Multi user inboxes
- ✗
- Open source
- ✗
Platform & deployment
Independently observed- Web
- Cloud / SaaS
Email on Acid alternatives
Other email testing dev we track, ranked by the same independent score.
- Testmail.appProgrammable email testing service for developers and QA automating end-to-end test verificationlow · 42%
- Maildevlow · 24%
- MailosaurPlatform for testing email and SMS communications end-to-end before productionmedium · 55%
- GreenMaillow · 31%
- MailSlurpOn-demand email and SMS testing platform for developersmedium · 54%
- MailHoglow · 19%
Compare Email on Acid
Side by side against other email testing dev, attribute by attribute, with a source on every value.
The Vioscale score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Email on Acid, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Pricing transparency | 75 | 0.08 | 6.3 | ✓ |
| Security posture | 70 | 0.07 | 5.1 | ✓ |
| Reliability | 45 | 0.07 | 3.3 | ✓ |
| Capabilities | 67 | 0.05 | 3.3 | ✓ |
| Price level | 25 | 0.05 | 1.3 | ✓ |
| Integrations | 0 | 0.04 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Api assertions, Spam score check, Rendering preview, Blocklist deliverability check | mediumsource · 2026-08-25 · 60% |
Market
| Attribute | Value | Evidence |
|---|---|---|
| Availability | PrimaryMarkets: … · AvailabilityScope: global · AvailableCountries: … · NotAvailableCountries: … | mediumsource · 2026-08-25 · 50% |
Pricing
Reliability
| Attribute | Value | Evidence |
|---|---|---|
| Sla pct | 99.9 | mediumsource · 2026-08-25 · 60% |