GlockApps
Inbox infraStandalone inbox placement tester that works with any sending tool.
The verdict
Use GlockApps when you test for clients on different sending tools, because it works on its own. The free plan has 2 tests. Essential is $59 a month billed yearly ($708 a year) or $85 billed monthly.
If you send from Instantly or Smartlead, check their placement add-ons first. Smartlead’s SmartDelivery Growth is $49 a month, billed monthly. Instantly’s inbox placement page gives 2 free tests to start and showed no price on October 21, 2026.
Best for
Agencies that test inbox placement for clients on different sending tools.
Not for
Skip it if you send from Instantly or Smartlead and only test your own campaigns.
Pricing truth
Free $0 (2 tests). Essential $59 a month billed yearly ($708 a year) or $85 billed monthly. Growth $99 billed yearly ($1,188) or $142 monthly. Enterprise $129 billed yearly ($1,548) or $185 monthly. The math: Essential billed yearly is $59 × 12 = $708 a year. Billed monthly, it is $85 × 12 = $1,020 a year, so yearly billing saves $1,020 minus $708 = $312 a year. Prices as listed on October 19, 2026.
When we use it
- Test where a campaign lands at Gmail, Outlook and other providers before you send to the full list.
- Run placement tests for clients who send from different tools.
What to do next
If you test inbox placement for clients on different sending tools, start with the GlockApps free plan and its 2 tests. Pick a paid plan on GlockApps pricing once you need more. If you send from Smartlead and only test your own campaigns, use its SmartDelivery add-on instead. Try Smartlead Next · Inbox placement tests compares GlockApps, Instantly and Smartlead.