Mailwarm 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 1.6.
Checked Oct 18, 2026 and Nov 12, 2026 · graded Oct 18, 2026 and Nov 12, 2026 by ToolGPA
Warmup Inbox grades higher on value for money and the free plan. They get the same grade on features, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Warmup Inbox
Email warm-up through a network of real inboxes, priced per inbox
Which one is for you
Pick Mailwarm if
- Fits if you send cold email from a few mailboxes and want help with deliverability
- Works for teams that want guidance as well as the tool
Look elsewhere if
- Pricey if you have one mailbox, at $69 a month
- Pricey if you add inboxes: 10 mailboxes is $479 a month on annual billing
- Skip it if you want to try before paying, because there is no free trial
- Watch out: interactions beyond a plan's allowance cost $0.02 each
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
| 1.6GPAMailwarmWeak | 2.4GPAWarmup InboxFair | |
|---|---|---|
| Value for money | D$69 a month for 1 mailbox on annual billing, about four times the $17.99 middle for deliverability tools. Growth is $159 for 3 and Scale $479 for 10, and the page says the expert help is why. | 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 | FNo free plan and no trial. The pricing page says it starts as soon as you connect an inbox. | 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 | CReal-inbox warmup, provider choice, controls and placement insights. A warmup tool covers its one job, and interactions beyond the allowance cost $0.02 each. | 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 | CNo store rating on record. You connect each mailbox or SMTP account and set its controls. | 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 | BWeb, with Gmail, Microsoft 365 and Yahoo listed. No apps or API are listed. | 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 a mailbox with expert help | 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: Mailwarm and Warmup Inbox. How we grade
Price against what you get
Mailwarm starts at $69 a month and scores 2.3 out of 4 on features, ease of use and platforms. Warmup Inbox starts at $15 a month and scores 2.3.
They score the same, and Warmup Inbox starts $54 a month lower. Of the other email verification and deliverability tools on the chart, 8 score higher than Mailwarm 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
- Mailwarm also covers reports.
- Warmup Inbox also covers email campaigns.
At a glance
| Mailwarm | Warmup Inbox | |
|---|---|---|
| Pricing | Paid | Free trial |
| Starts at | $69 per month for 1 mailbox, billed annually ($79 billed monthly) | $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 | Mailwarm | CyberPanda s. r. o. |
| Price read from | mailwarm.com | warmupinbox.com |
| Checked | Nov 12, 2026 | Oct 18, 2026 |
Worth knowing
Mailwarm
- There is no free trial; the pricing page says the tool starts working as soon as an inbox is connected.
- Interactions beyond a plan's allowance cost $0.02 each.
- The price scales with the number of mailboxes, from $69 for 1 to $479 for 10 on annual billing.
- The pricing page says it costs more than basic warmup tools because of the included expert guidance.
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
Mailwarm
- Real-inbox network
- Warmup activity comes from a network the vendor puts at 50,000+ aged real inboxes rather than only its own customers' accounts.
- Provider choice
- Pick Gmail, Outlook, Microsoft 365, Yahoo or SMTP as the warmup provider for each mailbox.
- Controls
- Set daily interaction volume, warmup schedule and reply rate from the dashboard.
- Spam score and placement insights
- Reports on inbox placement and spam signals are included on every plan.
- Expert help
- Each customer gets an account manager for SPF, DKIM and DMARC setup, plus deliverability expert calls.
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
Mailwarm
Starter$69
per month for 1 mailbox, billed annually ($79 billed monthly)
1 mailbox or SMTP account and 200+ positive interactions.
Growth$159
per month for 3 mailboxes, billed annually ($189 billed monthly)
3 mailboxes or SMTP accounts and 800+ positive interactions.
Scale$479
per month for 10 mailboxes, billed annually ($549 billed monthly)
10 mailboxes or SMTP accounts and 2000+ positive interactions.
TailoredCustom
Larger teams get a custom plan; contact the vendor.
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
Mailwarm
- Annual discount
Save with annual billing
The pricing page lists Starter at $69 a month billed annually against $79 billed monthly, with the same gap on Growth and Scale.
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, Mailwarm or Warmup Inbox?
As of Nov 12, 2026, Warmup Inbox is cheaper to start with: $15 a month, against $69 a month for Mailwarm. Mailwarm starts at $69 per month for 1 mailbox, billed annually ($79 billed monthly), and Warmup Inbox starts at $15 per inbox / month, billed annually ($19 monthly).
Which has a free plan, Mailwarm or Warmup Inbox?
As of Nov 12, 2026, neither Mailwarm 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.