GlockApps vs ZeroBounce
Side-by-side from the Top 11 ranking of The 11 Best Email Deliverability Tools. Last verified June 15, 2026.
The short answer
GlockApps ranks higher on Top 11 (#1 vs #9) for Email marketers and developers improving inbox placement rates. Top-tier inbox placement testing with a broad, international seed list and actionable reports.
At a glance
| GlockApps | ZeroBounce | |
|---|---|---|
| Top 11 rank | #1 / The 11 Best Email Deliverability Tools | #9 / The 11 Best Email Deliverability Tools |
| Score (out of 9.4) | 9.2 | 7.5 |
| Best for | Detailed inbox placement testing | Verification with add-on tools |
| Pricing | $$ ($79 to $399/mo) | $ (Pay-as-you-go or $15/mo+) |
| HQ | Hong Kong | Santa Barbara, USA |
| Founded | 2011 | 2015 |
GlockApps
Top-tier inbox placement testing with a broad, international seed list and actionable reports.
glockapps.com/ZeroBounce
An excellent list verification service with a growing suite of deliverability add-ons.
www.zerobounce.net/Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.