6 Best GlockApps Alternatives in 2026
GlockApps is deliverability testing and blacklist monitoring. We benchmarked 6 direct alternatives: 5 provide a free plan, and every price is verified against vendor billing terms.
Quick Comparison Matrix
| Tool | Starting Price | Free Tier / Trial | Primary Use Case |
|---|---|---|---|
| Free | Paid only / Trial | Senders diagnosing a sudden drop in open rates | |
| F Folderly | Free | Free spam-test tier | Teams that need a one-off deliverability audit rather than a subscription |
| €25 | Paid only / Trial | Teams sending cold email from new domains | |
| $15 | 7 days full access, no card up front | Teams sizing a sending fleet — cost scales linearly with inbox count | |
| $49 | Free 1-month trial with 5 inbox placement seed tests | High-volume SaaS applications sending millions of critical transactional emails monthly |
All 6 alternatives
F Folderly Deliverability platform sold as separate products pricingfree tierapi 
MailReach Inbox warmup and spam placement testing pricingfree tierapi 
Warmup Inbox Mailbox warmup priced per inbox, with the price on the page pricingfree tierapi 
Mailgun Optimize Enterprise email deliverability suite, inbox placement, and sender reputation monitor pricingfree tierapi 
Allegrow B2B sales email deliverability and spam risk monitoring platform pricingfree tierapi 
Spamcheck by Postmark Automated spam score testing API and email header verification tool pricingfree tierapi
MailReach Inbox warmup and spam placement testing pricingfree tierapi Warmup Inbox Mailbox warmup priced per inbox, with the price on the page pricingfree tierapi Mailgun Optimize Enterprise email deliverability suite, inbox placement, and sender reputation monitor pricingfree tierapi Allegrow B2B sales email deliverability and spam risk monitoring platform pricingfree tierapi Spamcheck by Postmark Automated spam score testing API and email header verification tool pricingfree tierapi prices read from vendor pricing pages · 20 Aug 2026 · how we verify
Head-to-head comparisons
GlockApps vs Folderly GlockApps vs MailReach GlockApps vs Warmup Inbox GlockApps vs Mailgun Optimize GlockApps vs Allegrow GlockApps vs Spamcheck by Postmark
Why people look for an alternative
- Teams needing warmup — this tests, it does not warm