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Head-to-head · Email Testing Software

GlockApps vs MailSlurp

  • 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
MailSlurp #5 in Email Testing Software 8.0/10 Free plan Free plan✓ 5 of 5 features Visit MailSlurp

GlockApps leads on 0 checks, MailSlurp on 1, and 6 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 priceMailSlurp · $19.99/mo
  • Free planboth
  • Most featuresMailSlurp · 5 of 5

GlockApps scores higher on our rubric for email testing software: 8.5 against 8.0 out of 10; our editors rank them #3 and #5.

MailSlurp is cheaper to start at $19.99/mo against $59/mo.

GlockApps is the better fit for deliverability monitoring and sender reputation. MailSlurp is the better fit for end-to-end email and SMS testing.

  • GlockApps fits best

    Deliverability monitoring and sender reputation

  • 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 GlockApps 8.5/10 Visit ↗ MailSlurp 8.0/10 Visit ↗
At a glance
Editor score 8.5 8.0
Ranking #3 in Email Testing Software #5 in Email Testing Software
Best for Deliverability monitoring and sender reputation End-to-end email and SMS testing
Pricing model Free plan + paid Free plan + paid
Starting price $59/mo $19.99/mo (best)
Free plan ✓ ✓
Free trial — —
Deployment Cloud Cloud
Platforms Web Web
Support Email, Live chat, Phone, Docs Tickets, Docs
Integrations 7 integrations 79+ integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features GlockApps 1/5 · MailSlurp 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 2 clients
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
  • 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
  • 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
  • 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

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 →

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. GlockAppsEmail Testing Software 8.5Free plan
  2. MailSlurpEmail Testing Software 8.0Free plan

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

  • 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.

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