Mailforge vs Warmbox (2026): which should you pick?
As of Nov 12, 2026, Warmbox grades higher than Mailforge: 1.8 against 1.6 out of 4.0.
Checked Nov 12, 2026 · graded Nov 12, 2026 by ToolGPA
Warmbox grades higher on value for money. They get the same grade on the free plan, features, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Mailforge
Shared-IP domains and mailboxes built for cold email sending
Which one is for you
Pick Mailforge if
- Fits if you want cheap mailboxes for a sequencer you already pay for
- Works for small senders happy on shared IPs
Look elsewhere if
- Skip it if you want a tool that sends campaigns, as it doesn't
- Not for you if you want a trial, since there isn't one
- Watch out: slots are charged whether or not a mailbox is created
- Pricey if you add domains and masking: .com is $14 a year and masking is $2 per domain a month
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
How we grade them
| 1.6GPAMailforgeWeak | 1.8GPAWarmboxWeak | |
|---|---|---|
| Value for money | C$3 a slot a month billed monthly, with a 10-slot minimum, so $30 at the floor. Just above the category's cheaper quarter ($25), before domains. | 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. |
| Free plan and trial | FNo free plan or trial. You can look around after signing up, but sending means buying domains and mailboxes. | FNo free plan and no trial is listed. A free blacklist and DNS checker is the only free part. |
| Features | DDomains, mailboxes and DNS only. It needs a separate sender to be useful, and shared IPs share a reputation. | 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. |
| Ease of use | CNo store rating on record. DNS is automated, but domains, slots and a sender all have to be put together. | CNo store rating on record. You connect each mailbox and pick a warm-up profile, which is a bit of setup per inbox. |
| Platforms and integrations | BWeb with an API, and Salesforge, Infraforge, Warmforge and Primeforge from the same maker. | BWeb only, but it works with Gmail, Google Workspace, Microsoft 365, Yahoo, SendGrid, Mailgun, Amazon SES and Zoho inboxes. |
| Best for | bulk mailboxes for cold email on shared IPs | warming up a single cold-email inbox |
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: Mailforge and Warmbox. How we grade
Price against what you get
Mailforge starts at $3 a month and scores 2.0 out of 4 on features, ease of use and platforms. Warmbox starts at $15 a month and scores 2.0.
They score the same, and Mailforge starts $12 a month lower. Of the other cold outreach tools on the chart, none scores higher than Mailforge for less, and 1 scores higher than Warmbox 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
- Mailforge also covers dMARC.
- Warmbox also covers reports.
At a glance
| Mailforge | Warmbox | |
|---|---|---|
| Pricing | Paid | Paid |
| Starts at | $3 per mailbox slot / month, billed monthly, with a 10-slot minimum | $15 per month for 1 inbox (the page's other billing toggle shows $19) |
| Free plan | None | None |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Mailforge | Warmbox |
| Price read from | mailforge.ai | warmbox.ai |
| Checked | Nov 12, 2026 | Nov 12, 2026 |
Worth knowing
Mailforge
- Slots are billed whether or not a mailbox is created in them, and the minimum purchase is 10.
- Domains are bought separately; the calculator prices .com at $14 a year, charged once, with no annual discount on domains.
- There is no free trial; the app can be explored after sign-up, but domains and mailboxes must be purchased to send.
- Each Forge product is a separate subscription, and SSL and domain masking costs $2 per domain a month.
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.
Key features
Mailforge
- Automated DNS setup
- Each domain added gets DMARC, SPF, DKIM and custom domain tracking configured, with bulk DNS updates in the app.
- Shared IP pool
- Mailboxes are spread across a shared IP pool, in contrast with Infraforge's dedicated servers.
- Pre-warmed domains and mailboxes
- The page says domains and mailboxes can be bought pre-warmed so sequences can start right away.
- Workspaces and domain transfers
- Projects can have their own workspaces, and domains can be transferred in or out.
- Works with any sending tool
- Mailboxes connect to any sending software, including Salesforge from the same vendor.
- SSL and domain masking
- An add-on that redirects securely while masking the domain behind a branded website.
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.
Plans
Mailforge
Mailbox slots$3
per mailbox slot / month, billed monthly, 10-slot minimum
Slots are the capacity to create mailboxes and are charged whether used or not. The calculator shows 25 slots at $75 a month, or $60 a month billed yearly.
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.
Ways to pay less
Mailforge
- Annual discount
Two months free on annual mailbox billing
The FAQ says annual billing for mailboxes gets 2 months free automatically; there is no discount on domains.
Warmbox
No public discounts listed.
Common questions
Which is cheaper, Mailforge or Warmbox?
As of Nov 12, 2026, Mailforge is cheaper to start with: $3 a month, against $15 a month for Warmbox. Mailforge starts at $3 per mailbox slot / month, billed monthly, with a 10-slot minimum, and Warmbox starts at $15 per month for 1 inbox (the page's other billing toggle shows $19).
Which has a free plan, Mailforge or Warmbox?
As of Nov 12, 2026, neither Mailforge nor Warmbox 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.