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Head-to-head · Email Testing Software

Litmus vs MailSlurp

  • Updated Oct 2026
  • Both researched from official sources
  • 7 checks side by side
Higher score Litmus #1 in Email Testing Software 9.3/10 7-day trial Free trial✓ 5 of 5 features Visit Litmus
MailSlurp #5 in Email Testing Software 8.0/10 Free plan Free plan✓ 5 of 5 features Visit MailSlurp

Litmus leads on 1 check, MailSlurp on 1, 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 scoreLitmus · 9.3/10
  • Free planonly MailSlurp
  • Free trialonly Litmus

Litmus scores higher on our rubric for email testing software: 9.3 against 8.0 out of 10; our editors rank them #1 and #5.

MailSlurp offers free plan; Litmus doesn't. Litmus leads on email clients: 100 clients versus 2 clients.

Litmus is the better fit for teams needing broad pre-send email QA. MailSlurp is the better fit for end-to-end email and SMS testing.

  • Litmus fits best

    Teams needing broad pre-send email QA

  • MailSlurp fits best

    End-to-end email and SMS testing

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 Litmus 9.3/10 Visit ↗ MailSlurp 8.0/10 Visit ↗
At a glance
Editor score 9.3 8.0
Ranking #1 in Email Testing Software #5 in Email Testing Software
Best for Teams needing broad pre-send email QA End-to-end email and SMS testing
Pricing model Paid Free plan + paid
Starting price — $19.99/mo
Free plan — ✓ (best)
Free trial 7 days —
Deployment Cloud, Browser extension Cloud
Platforms Web, Chrome extension Web
Support Email, Docs Tickets, Docs
Compliance SOC 2, ISO 27001, GDPR SOC 2, GDPR
Integrations 12 integrations 79+ integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Litmus 5/5 · MailSlurp 5/5
Spam checks ✓ ✓
Accessibility checks ✓ ✓
Link checks ✓ ✓
Inbox testing ✓ ✓
API access ✓ ✓
Specs
Email clients 100 clients (best) 2 clients
Device coverage Both Both
Our review
Pros
  • Previews across 100+ email clients and devices
  • Checks accessibility, links, spam issues, content, and code
  • Integrations, Chrome extension, and REST APIs support varied workflows
  • 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.
Cons
  • No free plan; access is paid with a 7-day free trial
  • Litmus Basic includes one full user
  • Litmus Plus is scoped to email teams of 2–3 people
  • 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.
Our verdict

Litmus is an email marketing platform for designers, developers, and marketing teams that need to build, inspect, and monitor campaigns before and after sending. Its core workflow combines email creation, previews across 100+ clients and…

Read the review →

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 →
  1. LitmusEmail Testing Software 9.37-day trial
  2. MailSlurpEmail Testing Software 8.0Free plan

Strengths and trade-offs

  • Litmus — where it wins

    • Previews across 100+ email clients and devices
    • Checks accessibility, links, spam issues, content, and code
    • Integrations, Chrome extension, and REST APIs support varied workflows

    Where it doesn't

    • No free plan; access is paid with a 7-day free trial
    • Litmus Basic includes one full user
    • Litmus Plus is scoped to email teams of 2–3 people

  • 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.
  • Litmus9.3/10 · 7-day trial

    Broad pre-send email QA with previews, testing, monitoring, integrations, and APIs.

    Visit LitmusFull verdict →
  • MailSlurp8.0/10 · Free plan

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

    Visit MailSlurpFull 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