Warmforge vs Warmup Inbox (2026): which should you pick?
As of Nov 13, 2026, we pick Warmup Inbox: it is second in our ranking of email verification and deliverability tools, and it grades higher too, 2.4 against 2.0.
Checked Oct 18, 2026 and Nov 12, 2026 · graded Oct 18, 2026 and Nov 12, 2026 by ToolGPA
Warmup Inbox grades higher on the free plan and platforms. They get the same grade on value for money, features and ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
Warmforge
Email warmup and inbox placement tests from the Salesforge team
Warmup Inbox
Email warm-up through a network of real inboxes, priced per inbox
Which one is for you
Pick Warmforge if
- Fits if you run a handful of outreach mailboxes and want warmup and placement tests in one place
- Works for Salesforge customers, who get unlimited slots
Look elsewhere if
- Not for you if you want to try warmup free first, since there is no trial
- Pricey if you run many mailboxes: every connected mailbox needs its own $10 slot
- Watch out: placement test plans are $32.50 to $140.80 a month on top of warmup
- Skip it if you want a mobile or desktop app, as it is web only
- Watch out: buy fewer slots than mailboxes and the rest get switched off
Pick Warmup Inbox if
- Fits if you're setting up new mailboxes and domains for cold email
- Works for warming a dedicated IP before raising volume, or many client inboxes from one dashboard
Look elsewhere if
- Pricey if you run lots of inboxes, as you pay for every one
- Tight if you write in another language or send through SES or SendGrid, as that warm-up needs Pro at $49 an inbox
- Skip it if you also need list cleaning or DMARC, as only a free record generator is offered
- Watch out: the trial lasts 7 days, and Basic stops at 75 warm-up messages a day with replies up to 25%
- Pricey if you pay monthly, at $19 an inbox against $15 billed yearly
How we grade them
| 2.0GPAWarmforgeFair | 2.4GPAWarmup InboxFair | |
|---|---|---|
| Value for money | B$10 per mailbox slot a month, billed quarterly, is at the bottom edge of what this category charges. It is per mailbox though: one pays $30 a quarter, five pay $150. | BBasic is $15 an inbox a month billed yearly ($19 monthly), and the price per inbox falls as you add more. That's the lowest price among its listed warm-up rivals: MailReach is $20 a mailbox, Warmy starts at $49 and InboxAlly at $149. |
| Free plan and trial | DNo free plan and no trial. The only free thing is 1 placement test a month once you sign up, and warming a mailbox needs a paid slot. | CNo free plan, but a 7-day trial of any plan with no card. That's a week to look around; after that you pay for each inbox. |
| Features | CAutomated warmup, health checks of DNS, MX and blacklists, and placement tests. The tests are priced separately, and with too few slots it warms only from the top of your list and disables the rest. | CIt does warm-up fully: more than 30,000 real inboxes replying to 25% to 50% of your emails by plan, spam and tab monitoring, IP warm-up and simple outreach sequences. No list cleaning or DMARC, though, and language and SES or SendGrid warm-up need Pro. |
| Ease of use | CA web app where you connect each mailbox and set up warmup. No rating on record, and the listing shows mailboxes to connect and DNS to check. | CNo App Store rating on record. You connect each mailbox and leave it running before you send, and the settings you'll want, your own templates and topics, sit on Pro. |
| Platforms and integrations | CWeb only. The one integration on record is Salesforge, whose subscribers get unlimited slots. | BWeb with an API on every plan, working with Gmail, Google Workspace, Outlook, Microsoft 365, Amazon SES, SendGrid and Zoho Mail. No phone or desktop app. |
| Best for | warming up several sending mailboxes | warm-up for new cold email inboxes |
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: Warmforge and Warmup Inbox. How we grade
Price against what you get
Warmforge starts at $10 a month and scores 2.0 out of 4 on features, ease of use and platforms. Warmup Inbox starts at $15 a month and scores 2.3.
Warmup Inbox scores higher, and starts $5 a month higher: the question is whether the extra is worth that to you. Of the other email verification and deliverability tools on the chart, 5 score higher than Warmforge for less, and 5 score higher than Warmup Inbox 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
- Warmforge also covers reports.
- Warmup Inbox also covers email campaigns.
At a glance
| Warmforge | Warmup Inbox | |
|---|---|---|
| Pricing | Paid | Free trial |
| Starts at | $10 per mailbox slot / month, billed quarterly | $15 per inbox / month, billed annually ($19 monthly) |
| Free plan | None | None |
| Free trial | None listed | 7-day free trial of any plan, no credit card required |
| Web | ||
| Made by | Forge Ecosystem | CyberPanda s. r. o. |
| Price read from | warmforge.ai | warmupinbox.com |
| Checked | Nov 12, 2026 | Oct 18, 2026 |
Worth knowing
Warmforge
- There is no free trial; mailbox slots must be bought to warm up, though you can sign up and run a free placement test.
- Placement test plans are sold separately from warmup slots, apart from 1 free test a month.
- If you buy fewer slots than mailboxes, the tool warms from the top of the list and disables the rest.
- The page says annual billing on mailboxes gives 2 months free, with no discount on domains.
Warmup Inbox
- Pricing is per inbox, so costs grow with each mailbox; volume discounts start from the second inbox.
- Language warm-up, email-platform warm-up and custom templates need Pro or above.
- It does not verify lists or manage DMARC; DMARC help is limited to a free record generator.
Key features
Warmforge
- Automated warmup
- AI-written emails exchanged to build trust with mailbox providers, started with one click.
- Mailbox slots
- Each slot covers one connected mailbox, and slots can be reassigned between mailboxes.
- Placement tests
- Sends from your mailbox to addresses at different providers to show delivery rates for Google, Outlook and others.
- Health checks
- Checks DNS and MX records and scans blacklists for every connected mailbox.
Warmup Inbox
- Warm-up network
- Your mailbox exchanges AI-written emails with more than 30,000 real inboxes, which reply to up to 25% to 50% of them depending on the plan.
- Spam and category monitoring
- Dashboards show whether warm-up emails land in spam or in a category tab, plus an email reputation check.
- Language and ESP warm-up
- On Pro and Max, warm up in other languages and through sending platforms such as SendGrid and Amazon SES, with custom templates and topics.
- IP warm-up
- Warms a dedicated sending IP before volume is raised.
- Outreach sequences
- Basic cold email sequences are included, so a warmed inbox can send campaigns from the same account.
- API and free tools
- A developer API on every plan, plus free placement tests, blacklist checks and DMARC and SPF record generators.
Plans
Warmforge
Email warm up$10
per mailbox slot / month, billed quarterly ($30 per quarter)
Includes automated AI warmup, 1 free placement test a month, and health checks of DNS and MX records and blacklist status. The page also offers monthly and annual billing.
Placement tests Pro$32.5
per month, billed annually ($39 billed monthly)
100 tests a month, 50 mailboxes per test.
Placement tests Growth$140.8
per month, billed annually ($169 billed monthly)
Unlimited tests, 250 mailboxes per test.
Warmup Inbox
Basic$15
per inbox / month, billed annually ($19 monthly)
75 warm-up messages a day, reply rate up to 25%, spam and category monitoring, outreach sequences and the API. The per-inbox price falls as inboxes are added.
Pro$49
per inbox / month, billed annually ($59 monthly)
250 warm-up messages a day, replies up to 45%, your own templates and topics, language and email-platform warm-up, and scheduling.
Max$79
per inbox / month, billed annually ($99 monthly)
1,000 warm-up messages a day, replies up to 50%, a technical setup check, premium support and unlimited API use.
51+ inboxesCustom
Quoted pricing with multi-client workspaces, consolidated billing, specialized reports and dedicated onboarding.
Ways to pay less
Warmforge
- Annual discount
Annual billing: 2 months free
The FAQ says choosing annual billing for mailboxes gives a discount of 2 months free.
Warmup Inbox
- Annual discount
Save 20% with annual billing
Annual plans are billed once for 12 months: Basic is $15 per inbox a month billed annually against $19 billed monthly.
Common questions
Which is cheaper, Warmforge or Warmup Inbox?
As of Nov 12, 2026, Warmforge is cheaper to start with: $10 a month, against $15 a month for Warmup Inbox. Warmforge starts at $10 per mailbox slot / month, billed quarterly, and Warmup Inbox starts at $15 per inbox / month, billed annually ($19 monthly).
Which has a free plan, Warmforge or Warmup Inbox?
As of Nov 12, 2026, neither Warmforge nor Warmup Inbox has a free plan. Warmup Inbox has a free trial.
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.