Head-to-head · Email Testing Software
GlockApps vs Mailtrap Email Sandbox
GlockApps leads on 0 checks, Mailtrap Email Sandbox on 1, and 4 are even. Who comes out ahead on the 5 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 priceMailtrap Email Sandbox · $14/mo
- Free planboth
- Most featuresMailtrap Email Sandbox · 3 of 5
GlockApps scores higher on our rubric for email testing software: 8.5 against 8.2 out of 10; our editors rank them #3 and #4.
Mailtrap Email Sandbox is cheaper to start at $14/mo against $59/mo.
GlockApps is the better fit for deliverability monitoring and sender reputation. Mailtrap Email Sandbox is the better fit for developers testing emails in isolated sandboxes.
- GlockApps fits best
Deliverability monitoring and sender reputation
- Mailtrap Email Sandbox fits best
Developers testing emails in isolated sandboxes
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Side by side
| Feature | GlockApps 8.5/10 Visit ↗ | Mailtrap Email Sandbox 8.2/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 8.5 | 8.2 |
| Ranking | #3 in Email Testing Software | #4 in Email Testing Software |
| Best for | Deliverability monitoring and sender reputation | Developers testing emails in isolated sandboxes |
| Pricing model | Free plan + paid | Free plan + paid |
| Starting price | $59/mo | $14/mo (best) |
| Free plan | ✓ | ✓ |
| Free trial | — | — |
| Deployment | Cloud | Cloud |
| Platforms | Web | Web |
| Support | Email, Live chat, Phone, Docs | Email, Live chat |
| Integrations | 7 integrations | 13 integrations |
| Built for | Solo, Small business, Mid-market, Enterprise | Small business, Mid-market, Enterprise |
| Features GlockApps 1/5 · Mailtrap Email Sandbox 3/5 | ||
| Spam checks | Not checked yet | ✓ (best) |
| Accessibility checks | Not checked yet | Not checked yet |
| Link checks | Not checked yet | Not checked yet |
| Inbox testing | Not checked yet | ✓ (best) |
| API access | ✓ | ✓ |
| Specs | ||
| Email clients | Not checked yet | Not checked yet |
| Device coverage | Not checked yet | Not checked yet |
| Our review | ||
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| Cons |
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| 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 → |
Mailtrap Email Sandbox is a hosted environment for developers, QA teams, marketers, and managers who need to test email workflows without delivering development or staging messages to real recipients. It captures SMTP traffic in isolated… Read the review → |
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
Mailtrap Email Sandbox — where it wins
- Captures SMTP traffic without sending test emails to real recipients
- Previews HTML and text emails with spam and HTML/CSS checks
- Supports APIs, automated testing, attachments, and multiple sandboxes
Where it doesn't
- Focused on development capture rather than client-rendering breadth
- Free plan limits usage to 50 test emails and one user
- Email forwarding is limited to approved recipients and plan allowances
- GlockApps8.5/10 · Free plan
A broad deliverability toolkit for inbox placement, reputation, authentication, and alerts.
Visit GlockAppsFull verdict → - Mailtrap Email Sandbox8.2/10 · Free plan
A developer-focused sandbox for capturing, inspecting, and automating email tests safely.
Visit MailtrapFull verdict →
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All email testing software comparisons → · Full ranking →
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update