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Head-to-head · Email Testing Software

MailSlurp vs Mailosaur

  • Updated Oct 2026
  • Both researched from official sources
  • 7 checks side by side
Higher score MailSlurp #5 in Email Testing Software 8.0/10 Free plan Free plan✓ 5 of 5 features Visit MailSlurp
Mailosaur #7 in Email Testing Software 7.8/10 14-day trial Free trial✓ 5 of 5 features Visit Mailosaur

MailSlurp leads on 2 checks, Mailosaur on 0, and 5 are even. Who comes out ahead on the 7 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreMailSlurp · 8.0/10
  • Lowest starting priceMailSlurp · $19.99/mo
  • Free planonly MailSlurp
  • Free trialonly Mailosaur

MailSlurp scores higher on our rubric for email testing software: 8.0 against 7.8 out of 10; our editors rank them #5 and #7.

MailSlurp offers free plan; Mailosaur doesn't. MailSlurp is cheaper to start at $19.99/mo against $20/mo.

MailSlurp is the better fit for end-to-end email and SMS testing. Mailosaur is the better fit for automated email and SMS test workflows.

  • MailSlurp fits best

    End-to-end email and SMS testing

  • Mailosaur fits best

    Automated email and SMS test workflows

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature MailSlurp 8.0/10 Visit ↗ Mailosaur 7.8/10 Visit ↗
At a glance
Editor score 8.0 7.8
Ranking #5 in Email Testing Software #7 in Email Testing Software
Best for End-to-end email and SMS testing Automated email and SMS test workflows
Pricing model Free plan + paid Paid
Starting price $19.99/mo (best) $20/mo
Free plan ✓ (best) —
Free trial — 14 days
Deployment Cloud Cloud
Platforms Web Web
Support Tickets, Docs Email, Docs
Compliance SOC 2, GDPR ISO 27001, GDPR, SSO/SAML, 2FA
Integrations 79+ integrations 13 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features MailSlurp 5/5 · Mailosaur 5/5
Spam checks ✓ ✓
Accessibility checks ✓ ✓
Link checks ✓ ✓
Inbox testing ✓ ✓
API access ✓ ✓
Specs
Email clients 2 clients Not checked yet
Device coverage Both Both
Our review
Pros
  • Programmable inboxes support end-to-end email and SMS workflow testing.
  • Audits cover links, images, accessibility, and HTML/CSS.
  • API, SDK, SMTP, IMAP, webhooks, and test-runner integrations are available.
  • Virtual inboxes support unlimited test email addresses.
  • Checks accessibility, spam, links, and compatibility across 90+ clients.
  • Integrates with major test frameworks, CI tools, and a REST API.
Cons
  • Verified email previews cover two email clients.
  • Free and Starter plans have limited device renders and placement tests.
  • Enterprise capacity and pricing are custom rather than listed monthly tiers.
  • There is no free plan.
  • Displayed Personal and Core prices use annual billing.
  • Advanced permissions, SSO, and account controls require Enterprise.
Our verdict

MailSlurp is a hosted email and SMS testing platform for developers, QA teams, email marketers, and deliverability teams. Its core toolkit combines programmable permanent and disposable inboxes with workflow testing, rendering previews,…

Read the review →

Mailosaur is a cloud platform for testing email and SMS workflows, aimed at individual testers, collaborative QA teams, and enterprises validating end-to-end messaging journeys. Virtual inboxes and unlimited test email addresses support…

Read the review →
  1. MailSlurpEmail Testing Software 8.0Free plan
  2. MailosaurEmail Testing Software 7.814-day trial

Strengths and trade-offs

  • MailSlurp — where it wins

    • Programmable inboxes support end-to-end email and SMS workflow testing.
    • Audits cover links, images, accessibility, and HTML/CSS.
    • API, SDK, SMTP, IMAP, webhooks, and test-runner integrations are available.

    Where it doesn't

    • Verified email previews cover two email clients.
    • Free and Starter plans have limited device renders and placement tests.
    • Enterprise capacity and pricing are custom rather than listed monthly tiers.

  • Mailosaur — where it wins

    • Virtual inboxes support unlimited test email addresses.
    • Checks accessibility, spam, links, and compatibility across 90+ clients.
    • Integrates with major test frameworks, CI tools, and a REST API.

    Where it doesn't

    • There is no free plan.
    • Displayed Personal and Core prices use annual billing.
    • Advanced permissions, SSO, and account controls require Enterprise.
  • MailSlurp8.0/10 · Free plan

    A developer-focused testing suite spanning inboxes, rendering, audits, placement, and automation.

    Visit MailSlurpFull verdict →
  • Mailosaur7.8/10 · 14-day trial

    A strong choice for automated email and SMS validation across clients, devices, and test frameworks.

    Visit MailosaurFull verdict →

More comparisons

All email testing software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update