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Head-to-head · Email Testing Software

Twilio Email Testing vs Mailosaur

  • Updated Oct 2026
  • Both researched from official sources
  • 7 checks side by side
Higher score Twilio Email Testing #2 in Email Testing Software 8.8/10 Free plan · 60-day trial Free planFree trial✓ 4 of 5 features Visit Twilio
Mailosaur #7 in Email Testing Software 7.8/10 14-day trial Free trial✓ 5 of 5 features Visit Mailosaur

Twilio Email Testing 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 scoreTwilio Email Testing · 8.8/10
  • Lowest starting priceTwilio Email Testing · $15/mo
  • Free planonly Twilio Email Testing
  • Free trialboth
  • Most featuresMailosaur · 5 of 5

Twilio Email Testing scores higher on our rubric for email testing software: 8.8 against 7.8 out of 10; our editors rank them #2 and #7.

Twilio Email Testing offers free plan; Mailosaur doesn't. Twilio Email Testing is cheaper to start at $15/mo against $20/mo.

Twilio Email Testing is the better fit for teams wanting a generous testing trial. Mailosaur is the better fit for automated email and SMS test workflows.

  • Twilio Email Testing fits best

    Teams wanting a generous testing trial

  • 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 Twilio Email Testing 8.8/10 Visit ↗ Mailosaur 7.8/10 Visit ↗
At a glance
Editor score 8.8 7.8
Ranking #2 in Email Testing Software #7 in Email Testing Software
Best for Teams wanting a generous testing trial Automated email and SMS test workflows
Pricing model Free plan + paid Paid
Starting price $15/mo (best) $20/mo
Free plan ✓ (best) —
Free trial 60 days 14 days
Free trial length 60 days · no card needed 14 days
Deployment Cloud Cloud
Platforms Web Web
Support Tickets, Live chat, Phone, Docs · 24/7 Email, Docs
Compliance GDPR, SOC 2, 2FA ISO 27001, GDPR, SSO/SAML, 2FA
Built for Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Twilio Email Testing 4/5 · Mailosaur 5/5
Spam checks ✓ ✓
Accessibility checks Not checked yet ✓ (best)
Link checks ✓ ✓
Inbox testing ✓ ✓
API access ✓ ✓
Specs
Email clients Not checked yet Not checked yet
Device coverage Both Both
Our review
Pros
  • 60-day free trial with 3 email testing credits
  • Rendering, spam, link, and broken-link testing
  • API access plus recurring credit add-ons
  • 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
  • Testing credits expire monthly
  • Advanced features require the $60/month plan
  • Accessibility features and named integrations are not stated
  • There is no free plan.
  • Displayed Personal and Core prices use annual billing.
  • Advanced permissions, SSO, and account controls require Enterprise.
Our verdict

Twilio Email Testing is an email-quality feature within Twilio SendGrid Marketing Campaigns and selected Email API plans. It is designed for marketers and email teams that want to check campaigns before sending, using inbox-rendering…

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. Twilio Email TestingEmail Testing Software 8.8Free plan · 60-day trial
  2. MailosaurEmail Testing Software 7.814-day trial

Strengths and trade-offs

  • Twilio Email Testing — where it wins

    • 60-day free trial with 3 email testing credits
    • Rendering, spam, link, and broken-link testing
    • API access plus recurring credit add-ons

    Where it doesn't

    • Testing credits expire monthly
    • Advanced features require the $60/month plan
    • Accessibility features and named integrations are not stated

  • 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.
  • Twilio Email Testing8.8/10 · Free plan · 60-day trial

    A flexible email-testing option with a free trial, rendering checks, spam tests, and API access.

    Visit TwilioFull 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