Starter
For solo senders watching a single domain.
$49 /month
Start your 14-day trial → - 1 domain
- DNS audit
- Blocklist checks
- Weekly diagnosis
Pricing
Simple pricing. Built for multi-domain senders.
Every plan includes the full diagnosis engine. No feature gating. No enterprise sales calls.
- Every tier starts free
- No credit card to start
- 30-day money-back guarantee
- Cancel any time
Growth
For small teams managing up to 5 domains.
$99 /month
Start your 14-day trial → - 5 domains
- Multi-domain dashboard
- Daily diagnosis
- Email alerts
Multi-Domain
Most popularFor teams managing 5–20 client or brand domains.
$249 /month
Start your 14-day trial → - 20 domains
- Multi-domain dashboard
- Client-ready reports
- Priority support
Scale
For 20+ domains or large agencies.
$499 /month
Start your 14-day trial → - Unlimited domains
- White-label reports
- Dedicated support
Connectors
Plug into your stack in 5 minutes.
Brain reads bounces, complaints and opens straight from your ESP — no SDK, no migration, no engineer. Connect once and the first diagnosis runs the same day.
Market position
Where InboxStack sits in the market
We cover the whole middle: teams too big for a seed-test tool and too small for an enterprise contract, with a price that makes sense at every volume.
Basic seed testing only ▲ We are here Enterprise only + sales call
For the GlockApps customer
Same price. Data straight from your ESP. The actual cause of the drop. Not just a test result.
For the Validity Everest customer
Half the price. ESP connectors they don't have. No sales call required.
For displaced Litmus/Everest customers
Your old Everest features — still available, without the Litmus bundle you didn't ask for.
FAQ
Pricing questions, answered.
How does pricing scale with how many domains I manage?
By domain count, not email volume. Starter covers 1 domain, Growth 5, Multi-Domain 20, Scale is unlimited. Move up a tier the moment you add a domain past your limit — upgrades take effect immediately.
Can I switch plans mid-month?
Yes. Upgrades take effect immediately and are prorated. Downgrades take effect at the start of your next billing cycle. No cancellation fees.
Is there a long-term contract?
No. All plans are month-to-month. Annual billing saves 20% but is never required. Cancel any time.
What happens after the 14-day trial?
You choose a plan or the account pauses — no surprise charge. Run a free audit first if you want to see the output before you start a trial.
Do you have anything above Scale?
If you're managing more domains than Scale covers or need a custom arrangement, talk to our team. We price by domain count, not headcount.