Warmbox vs Zapmail (2026): which should you pick?
As of Nov 12, 2026, Warmbox grades higher than Zapmail: 1.8 against 1.4 out of 4.0.
Checked Nov 12, 2026 · graded Nov 12, 2026 by ToolGPA
Warmbox grades higher on value for money and platforms. They get the same grade on the free plan, features and ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
Which one is for you
Pick Warmbox if
- Fits if you send cold email from one or two new mailboxes and want a warm-up run in the background
- Works for agencies that connect many client inboxes and will ask for a custom plan
Look elsewhere if
- Skip it if you want a free try, because there is no trial or free plan
- Tight if you run more than 6 inboxes, as plans stop there and larger setups are custom
- Pricey if you add inboxes: $15 for 1 inbox becomes $69 for 3
- Watch out: the vendor says warm-up usually needs 15 to 30 days of uninterrupted running before results show
- Watch out: the pricing page doesn't say which billing period each of its two price sets applies to
Pick Zapmail if
- Fits if you run cold email from many Google mailboxes and want domains and DNS done for you
- Works for agencies that create client mailboxes in bulk through an API
Look elsewhere if
- Skip it if you want a try first, as there is no free plan or trial
- Pricey if you grow: 10 mailboxes are $39, 30 are $99, 100 are $299
- Watch out: Google Workspace mailbox pricing rises after the first year
- Watch out: API access is on Pro only, and the prices shown are monthly while quarterly and yearly tabs differ
- Not for you if you want to write or send campaigns, since it is mailbox infrastructure only
How we grade them
| 1.8GPAWarmboxWeak | 1.4GPAZapmailWeak | |
|---|---|---|
| Value for money | B$15 a month for 1 inbox is inside the cheapest quarter of cold outreach tools ($25), but the 3-inbox plan is $69 and 6 inboxes is $139. The page's other billing toggle shows $19. | C$39 a month for 10 mailboxes billed monthly is the middle of cold outreach tools. Extra mailboxes are $3.50 each, and Google raises its mailbox price after a year. |
| Free plan and trial | FNo free plan and no trial is listed. A free blacklist and DNS checker is the only free part. | FNo free plan and no trial on the page. A free tools menu exists, but the product itself starts at $39. |
| Features | DIt warms inboxes with automated traffic, profiles and monitoring. It does not find leads or send campaigns, so it needs a sending tool next to it. | DIt buys domains, sets DNS, creates mailboxes and connects them to a sending tool. It sends nothing itself, so it needs an outreach tool next to it. |
| Ease of use | CNo store rating on record. You connect each mailbox and pick a warm-up profile, which is a bit of setup per inbox. | CNo store rating on record. The vendor says setup averages 5 minutes, but you still have to connect the mailboxes to a sender and manage domains. |
| Platforms and integrations | BWeb only, but it works with Gmail, Google Workspace, Microsoft 365, Yahoo, SendGrid, Mailgun, Amazon SES and Zoho inboxes. | CWeb only and Google Workspace only. An API is on the $299 Pro plan. |
| Best for | warming up a single cold-email inbox | buying Google Workspace mailboxes for cold email |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Warmbox and Zapmail. How we grade
Price against what you get
Warmbox starts at $15 a month and scores 2.0 out of 4 on features, ease of use and platforms. Zapmail starts at $39 a month and scores 1.7.
Warmbox scores higher and starts $24 a month lower. Of the other cold outreach tools on the chart, 1 scores higher than Warmbox for less, and 21 score higher than Zapmail for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- Warmbox also covers reports.
At a glance
| Warmbox | Zapmail | |
|---|---|---|
| Pricing | Paid | Paid |
| Starts at | $15 per month for 1 inbox (the page's other billing toggle shows $19) | $39 per month for 10 Google Workspace mailboxes, billed monthly |
| Free plan | None | None |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Warmbox | Outbox Labs Inc. |
| Price read from | warmbox.ai | zapmail.ai |
| Checked | Nov 12, 2026 | Nov 12, 2026 |
Worth knowing
Warmbox
- The pricing page does not state which billing period each of its two price sets applies to; the default view shows $15 for Solo and the other toggle shows $19.
- Plans are sized by the number of inboxes (1, 3 or 6) and by emails a day, so larger setups need a custom plan.
- The vendor says warm-up usually takes 15 to 30 days of uninterrupted warming before results show.
- It warms mailboxes only; it does not send campaigns or find leads.
Zapmail
- The listed prices are monthly; the page also has quarterly and yearly tabs, and its description says annual plans start from $2.50 per inbox.
- Google Workspace mailbox pricing rises after the first year, and mailboxes that have completed a year are charged at the updated price.
- It supplies mailboxes and domains only; campaigns are sent from a separate outreach tool.
- API access is on the Pro plan only; volume pricing for larger senders is by talking to sales.
Key features
Warmbox
- Automated warm-up traffic
- Sends and answers messages with a private inbox network, marks them as favorites and removes them from spam.
- Warm-up profiles
- Growth, flat or random volume patterns, a warm-up schedule and fully custom settings.
- Realistic content
- The page says replies are written to look human, using GPT-4 and a hybrid approach.
- Checks and monitoring
- A live email checker for DNS and blacklists, spam score monitoring and a reporting dashboard.
- Many inbox types
- Gmail and Google Workspace by OAuth, Microsoft 365, Yahoo, iCloud, AOL, Zoho, SendGrid, Mailgun, Amazon SES and any SMTP mailbox.
- Agency use
- Multi-account support for agencies and team members on every plan.
Zapmail
- Automated mailbox setup
- Creates Google Workspace mailboxes, sets DNS records and connects them to an outreach tool. The site gives an average setup time of 5 minutes.
- Domains
- Customers can bring their own domains or buy new ones, and each workspace holds one domain to keep sending reputations separate.
- Pre-warmed mailboxes
- A separate pre-warmed option is sold with domains included, starting from $6 per mailbox, to skip the first 3 to 4 weeks of warm-up.
- ZapShield
- Daily blacklist monitoring at $3 per domain a month, with a free replacement domain if one is listed.
- Deliverability test and AI Insights
- Monthly credits for inbox placement tests and AI-generated insights are included on every plan.
- API
- An API for creating mailboxes and domains from another product is included on the Pro plan.
Plans
Warmbox
Solo$15
per month for 1 inbox, billing basis unclear
1 inbox warmed at up to 50 emails a day, 1 member and premium support. The page's other toggle lists $19.
Start-up$69
per month for 3 inboxes, billing basis unclear
3 inboxes at up to 250 emails a day, 3 team members and premium support. The other toggle lists $79.
Growth$139
per month for 6 inboxes, billing basis unclear
6 inboxes at up to 500 emails a day, 6 team members and enterprise support. The other toggle lists $159.
TeamCustom
Custom plans for larger sending volumes, quoted through the vendor's chat.
Zapmail
Starter$39
per month for 10 Google Workspace mailboxes, billed monthly
Extra mailboxes at $3.50 each; 3 deliverability test credits and 3 AI Insights credits a month; standard support.
Growth$99
per month for 30 Google Workspace mailboxes, billed monthly
Extra mailboxes at $3.25 each; 10 deliverability test credits and 10 AI Insights credits a month; standard support.
Pro$299
per month for 100 Google Workspace mailboxes, billed monthly
Extra mailboxes at $3.00 each; 30 deliverability test credits and 30 AI Insights credits a month; priority support and API access.
Ways to pay less
Warmbox
No public discounts listed.
Zapmail
- Annual discount
Yearly billing, 2 months free
The pricing page's billing switch labels the yearly option as 2 months free and shows quarterly billing as well. Those prices are not shown in the default monthly view.
Common questions
Which is cheaper, Warmbox or Zapmail?
As of Nov 12, 2026, Warmbox is cheaper to start with: $15 a month, against $39 a month for Zapmail. Warmbox starts at $15 per month for 1 inbox (the page's other billing toggle shows $19), and Zapmail starts at $39 per month for 10 Google Workspace mailboxes, billed monthly.
Which has a free plan, Warmbox or Zapmail?
As of Nov 12, 2026, neither Warmbox nor Zapmail has a free plan.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.