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Head-to-head · Email Testing Software

GlockApps vs Mailosaur

  • Updated Oct 2026
  • Both researched from official sources
  • 7 checks side by side
Higher score GlockApps #3 in Email Testing Software 8.5/10 Free plan Free plan✓ 1 of 5 features Visit GlockApps
Mailosaur #7 in Email Testing Software 7.8/10 14-day trial Free trial✓ 5 of 5 features Visit Mailosaur

GlockApps leads on 1 check, Mailosaur 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 scoreGlockApps · 8.5/10
  • Lowest starting priceMailosaur · $20/mo
  • Free planonly GlockApps
  • Free trialonly Mailosaur
  • Most featuresMailosaur · 5 of 5

GlockApps scores higher on our rubric for email testing software: 8.5 against 7.8 out of 10; our editors rank them #3 and #7.

GlockApps offers free plan; Mailosaur doesn't. Mailosaur is cheaper to start at $20/mo against $59/mo.

GlockApps is the better fit for deliverability monitoring and sender reputation. Mailosaur is the better fit for automated email and SMS test workflows.

  • GlockApps fits best

    Deliverability monitoring and sender reputation

  • 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 GlockApps 8.5/10 Visit ↗ Mailosaur 7.8/10 Visit ↗
At a glance
Editor score 8.5 7.8
Ranking #3 in Email Testing Software #7 in Email Testing Software
Best for Deliverability monitoring and sender reputation Automated email and SMS test workflows
Pricing model Free plan + paid Paid
Starting price $59/mo $20/mo (best)
Free plan ✓ (best) —
Free trial — 14 days
Deployment Cloud Cloud
Platforms Web Web
Support Email, Live chat, Phone, Docs Email, Docs
Integrations 7 integrations 13 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features GlockApps 1/5 · Mailosaur 5/5
Spam checks Not checked yet ✓ (best)
Accessibility checks Not checked yet ✓ (best)
Link checks Not checked yet ✓ (best)
Inbox testing Not checked yet ✓ (best)
API access ✓ ✓
Specs
Email clients Not checked yet Not checked yet
Device coverage Not checked yet Both
Our review
Pros
  • Tests inbox placement across major mailbox providers
  • Monitors SPF, DKIM, DMARC, reputation, and blocklists
  • Includes automated alerts, integrations, and REST API access
  • 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
  • Free Inbox Insight access provides two credits
  • Uptime Monitor has a separate 14-day trial
  • Paid plans start at $59 per month before applicable VAT or tax
  • There is no free plan.
  • Displayed Personal and Core prices use annual billing.
  • Advanced permissions, SSO, and account controls require Enterprise.
Our verdict

GlockApps is an email deliverability platform for marketers, agencies, and businesses that need to understand how messages reach recipient inboxes. It tests inbox placement across major mailbox providers, evaluates spam-filter scores,…

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. GlockAppsEmail Testing Software 8.5Free plan
  2. MailosaurEmail Testing Software 7.814-day trial

Strengths and trade-offs

  • GlockApps — where it wins

    • Tests inbox placement across major mailbox providers
    • Monitors SPF, DKIM, DMARC, reputation, and blocklists
    • Includes automated alerts, integrations, and REST API access

    Where it doesn't

    • Free Inbox Insight access provides two credits
    • Uptime Monitor has a separate 14-day trial
    • Paid plans start at $59 per month before applicable VAT or tax

  • 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.
  • GlockApps8.5/10 · Free plan

    A broad deliverability toolkit for inbox placement, reputation, authentication, and alerts.

    Visit GlockAppsFull 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