Campaigns, warm-up and a unified inbox, with unlimited connected mailboxes on Growth and Scale. Every plan, including the free Sandbox, comes with email checks.
Unlimited connected mailboxesBring your own Gmail/Outlook/SMTP
Warm-up included
Email checks included free
Priority support
CheckMX is free during beta. Growth and Scale are coming soon; join the waitlist and we’ll email you when they open.
How we compare
What’s included
CheckMXStarter
InstantlyGrowth
SmartleadBase
Monthly price
Free during beta (later $37/mo)
$47
$39
Price per 1,000 emails
Free during beta (later $6.17)
$9.40
$6.50
AI assistant cards in Claude, ChatGPT, Cursor
✓ Included
—
—
Emails sent / mo
6,000
5,000
6,000
Contacts
15,000
1,000
2,000
Connected mailboxes
25
Unlimited
Unlimited
Warm-up included
✓
✓
—
Free to start
Free during beta
✓
✓
What’s included
CheckMXGrowth
InstantlyHypergrowth
SmartleadPro
Monthly price
Coming soon ($87/mo)
$97
$94
Price per 1,000 emails
Coming soon ($0.58)
$0.78
$1.04
AI assistant cards in Claude, ChatGPT, Cursor
✓ Included
—
—
Emails sent / mo
150,000
125,000
90,000
Contacts
300,000
25,000
30,000
Connected mailboxes
Unlimited
Unlimited
Unlimited
Warm-up included
✓
✓
—
Free to start
Coming soon
✓
✓
What’s included
CheckMXScale
InstantlyLight Speed
SmartleadUnlimited Prime
EmailBisonBase Plan
Monthly price
Coming soon ($297/mo)
$358
$379
$599
Price per 1,000 emails
Coming soon ($0.59)
$0.72
$0.76
$1.20
AI assistant cards in Claude, ChatGPT, Cursor
✓ Included
—
—
—
Emails sent / mo
500,000
500,000
500,000
500,000
Contacts
1,000,000
100,000
Unlimited
Unlimited lead storage
Connected mailboxes
Unlimited
Unlimited
Unlimited
—
Warm-up included
✓
✓
—
✓
Free to start
Coming soon
✓
✓
—
Competitor pricing from their public pages as of Oct 30, 2026. — = not confirmed on the competitor's public pages. Price per 1,000 emails = monthly price ÷ monthly email cap. Sources: instantly.ai/pricing, smartlead.ai/pricing, emailbison.com/pricing.
A little more clarity
Frequently asked questions
The details, before you hit send.
What counts as an email sent?
Each campaign email sent from a connected mailbox counts toward your monthly limit. Follow-ups count as individual emails, too.
Is CheckMX really free?
Yes. CheckMX is free during beta. Starter is $0 for now and will be $37/mo later. Growth and Scale are coming soon; join the waitlist and we’ll email you when they open. No card is needed.
What's a connected mailbox?
It’s an email account you connect to CheckMX to send campaigns, such as Gmail, Outlook, or an SMTP mailbox. Bring your own accounts; Starter includes 25 connections, and Growth and Scale include unlimited connections.
Are email checks included?
Yes. Every plan, including the free Sandbox, comes with email checks at no extra cost.
Can I switch plans?
Yes. Everyone is on Starter, free during beta. Growth and Scale are coming soon, and we’ll email the waitlist when they open.