deliverlensFits your volume
Free
Understand your email with our website tools.
$0 / month
Website access
Get started free- Tools on the website
- API keys and AI connections included
- Email authentication and content results
- Guides to help you act on results
Start free.
Grow at your pace.
Test your email for free. Choose your volume to run checks through the API or your AI assistant.
No card needed to start Lower rates as you grow
Your monthly cost$3.90
50 tests at graduated rates
$0.08 per paid test on average
Billed monthly.
See the calculationFits your volume
Paid API
Choose your volume. Keep control of your costs.
$3.90 / month
Billed monthly.
50 total tests at your selected volume
Continue to checkout- Connect API keys and AI assistants
- Your test allowance refreshes every month
- Rates decrease across usage bands
- API-key usage analytics
Built around your needs
Enterprise
For larger volumes and a plan that fits your workflow.
Let’s talk.
More than 5,000 tests each month?
Talk to sales- Discuss higher testing volumes
- Agree API and service limits
- Review your integration needs
- Get a quote for your requirements
Know exactly what you pay
Clear usage bands.
Lower rates as you grow.
Each rate applies only to the tests within its band. API requests and diagnostic tests have separate allowances.
At your selected volume$3.90 / month
50 paid tests across the bands below.
A message test analyses an email sent to your test address. Other diagnostic services have their own allowances.
Your per-test rates
USD| Additional tests | Per test | Your cost |
|---|---|---|
| 1–10 | $0.10 | $1.00 |
| 11–20 | $0.08 | $0.80 |
| 21–50 | $0.07 | $2.10 |
| 51–100 | $0.06 | $0.00 |
| 101–200 | $0.05 | $0.00 |
| 201–300 | $0.04 | $0.00 |
| 301–5,000 | $0.03 | $0.00 |
| Monthly total | $3.90 | |
Each band is priced separately, so your price per test decreases as your allowance grows.
Find your fit
The essentials, side by side.
| What’s included | Free | Paid API | Enterprise |
|---|---|---|---|
| API message tests / month | Website only | Purchased allowance | Agreed volume |
| Pricing | $0 | Monthly or annual subscription | Custom quote |
| API-key usage analytics | Included | Included | Included |
| Academy and troubleshooting guides | Included | Included | Included |
| API and service limits | Connect and read results; website checks | Daily, monthly and service limits | Discuss your requirements |
One account. Shared limits.
API requests cover submissions and result reads. A result read does not consume another test. Daily and monthly caps apply together, across all keys and AI connections.
| Plan | Requests / day | Requests / month | Requests / minute | Concurrent checks |
|---|---|---|---|---|
| Paid API | 5,000 | 50,000 | 60 | 3 |
| Enterprise | Plan-defined | Plan-defined | 60 | 1 |
Provider quotas and service availability also apply. Your assigned plan determines your exact allowance.
Does the free plan include API access?
Every registered customer can create API keys, connect an AI assistant and read their own results. Starting diagnostic checks through API or MCP requires an active paid subscription. Website tools remain available. All keys and connections share the same account limits.
How is the price calculated?
We apply each rate only to the tests in its band. Use the calculator above to see the breakdown.
What counts as a message test?
A message test starts with an email sent to your test address, then gives you authentication and content results. Reading the same result does not create another message test.
Can I buy a one-time pack?
Choose a monthly subscription or save with annual billing. Any credits you purchased previously remain attached to your account under their original terms.
What if I need more than 5,000 tests?
Talk to sales about your volume, integration and service requirements. We’ll help you work out an Enterprise quote.
Make your next send a better one