kitio.aiInstantly 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 $47 for Instantly.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Unlimited email accounts
- Email warmup
- Lead database
- AI reply agent
- Built-in CRM
- Inbox warm-up
- Automated interactions
- Auto-reply
- Spam removal
- SMTP support
- Multi-provider support
| Feature | Instantly | Warmbox |
|---|---|---|
| Best for | Cold email at scale with unlimited inboxes and AI replies | Email warm-up that builds inbox reputation for cold outreach |
| Category | Sales | Sales |
| Pricing model | Free trial | Paid |
| Starting price | $47/mo | $19/mo |
| Free plan | No, 14-day trial | No |
| Made by | Instantly | Warmbox |
| Based in | United States | – |
| 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 $47 for Instantly.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Growth
$47/mo
- 5,000 emails per month
- 1,000 uploaded contacts
- Unlimited email accounts and warmup
Hypergrowth
$97/mo
- 125,000 emails per month
- 25,000 uploaded contacts
Light Speed
$358/mo
- 500,000+ emails per month
- 100,000+ uploaded contacts
- Private deliverability network
Enterprise
Custom
- 200,000+ credits per month
- Book a call
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
Instantly
- Pricing not tied to inbox count
- Strong deliverability tools
- Easy to start
- Leads and CRM billed separately
- Support quality varies
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 Instantly if you want:
- Pricing not tied to inbox count
- Strong deliverability tools
- Easy to start
Watch out: leads and crm billed separately.
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.
Instantly vs Warmbox FAQ
What is the difference between Instantly and Warmbox?
Instantly: Cold email at scale with unlimited inboxes and AI replies. Warmbox: Email warm-up that builds inbox reputation for cold outreach. Both are sales tools.
Is Instantly or Warmbox cheaper?
Warmbox has the lower starting price: about $19 a month, against $47 for Instantly.
Do Instantly and Warmbox have free plans?
Instantly: No, 14-day trial. Warmbox: No.
Who makes Instantly?
Instantly is made by Instantly, based in United States.
Who makes Warmbox?
Warmbox is made by Warmbox.
Which should I choose, Instantly or Warmbox?
Choose Instantly if you value pricing not tied to inbox count and strong deliverability tools. Choose Warmbox if you value works with many email providers and any inbox can be added over smtp.