kitio.aiSmartlead vs Warmbox
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Warmbox has the lower starting price: about $19 a month, against $39 for Smartlead.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Unlimited mailboxes
- Automated warmup
- Master inbox
- SmartAssistant AI
- White-label portal
- Inbox warm-up
- Automated interactions
- Auto-reply
- Spam removal
- SMTP support
- Multi-provider support
| Feature | Smartlead | Warmbox |
|---|---|---|
| Best for | Cold email platform with unlimited mailboxes and warmup | Email warm-up that builds inbox reputation for cold outreach |
| Category | Sales | Sales |
| Pricing model | Free trial | Paid |
| Starting price | $39/mo | $19/mo |
| Free plan | No, 14-day trial | No |
| Made by | Smartlead | Warmbox |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Warmbox has the lower starting price: about $19 a month, against $39 for Smartlead.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Base
$39/mo
- 2,000 contacts
- 6,000 email sends/month
- 2,000 verified emails
Pro
$94/mo
- 30,000 contacts
- 90,000 email sends/month
- 30,000 verified emails
Smart
$174/mo
- Unlimited contacts
- 150,000 email sends/month
- 50,000 verified emails
Prime
$379/mo
- 500,000 email sends/month
- 170,000 verified emails
- 3 SmartServers included
3 plans
Solo
$19/mo
- 1 inbox
- 50 emails a day
- 1 team member
Start-up
$79/mo
- 3 inboxes
- 250 emails a day
- 3 team members
Growth
$159/mo
- 6 inboxes
- 500 emails a day
- 6 team members
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Smartlead
- Built for agencies
- Unlimited mailboxes on every plan
- Good API
- Interface is less polished
- Lead data costs extra
Warmbox
- Works with many email providers
- Any inbox can be added over SMTP
- Same features on every plan
- Priced per inbox
- No free plan listed
- Does not send your outreach itself
Which one should you choose?
Choose Smartlead if you want:
- Built for agencies
- Unlimited mailboxes on every plan
- Good API
Watch out: interface is less polished.
Choose Warmbox if you want:
- Works with many email providers
- Any inbox can be added over SMTP
- Same features on every plan
Watch out: priced per inbox.
Smartlead vs Warmbox FAQ
What is the difference between Smartlead and Warmbox?
Smartlead: Cold email platform with unlimited mailboxes and warmup. Warmbox: Email warm-up that builds inbox reputation for cold outreach. Both are sales tools.
Is Smartlead or Warmbox cheaper?
Warmbox has the lower starting price: about $19 a month, against $39 for Smartlead.
Do Smartlead and Warmbox have free plans?
Smartlead: No, 14-day trial. Warmbox: No.
Who makes Smartlead?
Smartlead is made by Smartlead.
Who makes Warmbox?
Warmbox is made by Warmbox.
Which should I choose, Smartlead or Warmbox?
Choose Smartlead if you value built for agencies and unlimited mailboxes on every plan. Choose Warmbox if you value works with many email providers and any inbox can be added over smtp.