Warmup Inbox
Email warm-up through a network of real inboxes, priced per inbox
Our verdict
Second of our top three email verification and deliverability tools
For: Cold emailers warming new inboxes
Warmup Inbox builds a new mailbox's reputation by trading emails with more than 30,000 real inboxes, which reply to up to 25% of them on Basic, and shows whether warm-up mail lands in spam or a tab. It works with Gmail, Outlook, Microsoft 365 and Zoho Mail. Basic is $15 an inbox a month billed yearly ($19 monthly) for 75 warm-up messages a day, after a 7-day trial with no card. It is second because it serves cold emailers more than every sender: the cost grows with each inbox, language and SendGrid or Amazon SES warm-up need Pro at $49, and it does not clean lists or manage DMARC.
See all three and how we rankWarmup Inbox report card
Fair · out of 4.0 · graded Oct 18, 2026
Best for cheap warm-up for new cold email inboxes
Warmup Inbox swaps emails between your mailbox and a network of more than 30,000 real inboxes, so a new address builds a reputation before you send. At $15 an inbox a month billed yearly, it's the cheapest warm-up here. Language and email-platform warm-up need the $49 Pro plan, and there's no list cleaning or DMARC.
Who Warmup Inbox is for
- Great if you're setting up new mailboxes and domains for cold email
- Handy when you need to warm a dedicated IP before raising volume
- Good for agencies warming lots of client inboxes from one dashboard
Who Warmup Inbox is not for
- Pricey if you run lots of inboxes, as you pay for every one
- Tight if you write in another language, as language warm-up needs the $49 Pro plan
- Skip it if you also need list cleaning or DMARC
Why Warmup Inbox gets a 2.4
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- BValue for moneyBasic is $15 an inbox a month billed yearly ($19 monthly), and the price per inbox falls as you add more. That's the cheapest among its listed warm-up rivals: MailReach is $20 a mailbox, Warmy starts at $49 and InboxAlly at $149.
- CFree plan and trialNo free plan, but a 7-day trial of any plan with no card. Fine for a look around; after that you pay for each inbox.
- CFeaturesIt 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.
- CEase of useNo 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.
- BPlatforms and integrationsWeb 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.
What these grades rest on. Graded from this listing, whose facts were read from Warmup Inbox's own pages on 18 October 2026. Not based on using the product, and shorter than our full reviews. How we review and grade.
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<a href="https://toolgpa.com/tools/warmup-inbox#review"><img src="https://toolgpa.com/badge/warmup-inbox.svg" alt="Warmup Inbox: 2.4 GPA on ToolGPA" width="196" height="56"></a>Where Warmup Inbox stands among email verification and deliverability tools
Warmup Inbox's GPA of 2.4 is higher than 6 of the 15 other email verification and deliverability tools we grade, and level with 8.
It stands best on value for money (B, above 13 of 15) and worst on features (C, above 0).
Its paid plans start at $15 a month, against a middle price of $28 for the category: 0 of the 7 others that charge start lower.
On features, ease of use and platforms it scores 2.3 out of 4, and no tool on the category's chart scores higher without costing more.
Each grade against the category
Every bar is all 16 email verification and deliverability tools we grade, cut by the letter each got. Warmup Inbox’s own letter is outlined.
- BValue for moneyAbove 13 of 15, level with 2
- CFree plan and trialAbove 2 of 15, level with 12
- CFeaturesAbove 0 of 15, level with 13
- CEase of useAbove 0 of 15, level with 7
- BPlatforms and integrationsAbove 3 of 15, level with 12
Price against what you get
Each dot is one of 8 email verification and deliverability tools. Further left costs less, and higher up scores better on features, ease of use and platforms. Point at a dot to see which tool it is.
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
Keep Warmup Inbox, or make your own?
Keep it
To replace Warmup Inbox you would be making a network of real inboxes that open and answer your emails. That is not a weekend's work, with an AI app builder or without one.
It costs $180 a year.
What you could not
- A network of real inboxes that open and answer your emails.
- Newsletters sent to thousands of people that still reach the inbox.
- It plugs into other products, Gmail, Google Workspace and Outlook among them, and has an API.
- AI features, unless you pay a model provider for each request yourself.
What this rests on. Warmup Inbox’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
What is Warmup Inbox?
Warmup Inbox handles warm-up: it sends and replies to emails between your mailbox and a network of more than 30,000 real inboxes, which reply to a share of them, so a new address or domain builds a sending reputation. It also warms dedicated IPs and email platforms such as SendGrid and Amazon SES, and includes simple outreach sequences. It does not clean lists or manage DMARC. Plans are priced per inbox.
Warmup Inbox is a paid product with a free trial, starting at $15 per inbox / month, billed annually ($19 monthly). See every plan
Good for
- Cold emailers setting up new mailboxes and domains
- Agencies warming many client inboxes from one dashboard
- Senders on SendGrid or Amazon SES who need to warm a domain or IP
Worth knowing
- 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
- 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.
Warmup Inbox pricing
- Starts at
- $15 per inbox / month, billed annually ($19 monthly)
- Free plan
- None
- Free trial
- 7-day free trial of any plan, no credit card required
| Plan | Price | What you get |
|---|---|---|
| Basic | $15per 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 | $49per 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 | $79per 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+ inboxes | Custom | Quoted pricing with multi-client workspaces, consolidated billing, specialized reports and dedicated onboarding. |
Read from warmupinbox.com on Oct 18, 2026. Prices change, so confirm with Warmup Inbox before you buy.
Ways to pay less
- Annual discountSave 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.
Stated on warmupinbox.com
Works with
- Gmail
- Google Workspace
- Outlook
- Microsoft 365
- Amazon SES
- SendGrid
- Zoho Mail
Warmup Inbox alternatives
- Warmup Inbox vs MailReach
From $20/mo
- Warmup Inbox vs Warmy
Free trial · from $49/mo
- Warmup Inbox vs InboxAlly
Free trial · from $149/mo
- Warmup Inbox vs GlockApps
Free plan · from $59/mo
Common questions
Is Warmup Inbox free?
No, Warmup Inbox is a paid product, but you can try it first. 7-day free trial of any plan, no credit card required.
How much does Warmup Inbox cost?
Warmup Inbox lists 4 plans. Basic: $15 per inbox / month, billed annually ($19 monthly). Pro: $49 per inbox / month, billed annually ($59 monthly). Max: $79 per inbox / month, billed annually ($99 monthly). 51+ inboxes: custom pricing. Prices were read from warmupinbox.com on Oct 18, 2026.
What platforms does Warmup Inbox work on?
Warmup Inbox is available on Web.
Does Warmup Inbox offer any discounts?
Warmup Inbox publicly lists the following: Save 20% with annual billing.
Does Warmup Inbox have an Android app?
No Android app was listed when its pages were read on Oct 18, 2026. Warmup Inbox is listed for Web.
Does Warmup Inbox have an iPhone app?
No iPhone app was listed when its pages were read on Oct 18, 2026. Warmup Inbox is listed for Web.
Is Warmup Inbox open source?
Warmup Inbox is not described as open source on its own site, as read on Oct 18, 2026.
Does Warmup Inbox have an API?
Yes. Warmup Inbox offers a public API, according to its own site.
What does Warmup Inbox integrate with?
Warmup Inbox's listing names Gmail, Google Workspace, Outlook, Microsoft 365, Amazon SES, SendGrid and Zoho Mail. A listing names up to eight integrations, so it may connect to more.
Who makes Warmup Inbox?
Warmup Inbox is made by CyberPanda s. r. o.
What are the alternatives to Warmup Inbox?
The closest alternatives to Warmup Inbox in our directory are MailReach, Warmy, InboxAlly and GlockApps. Each one has a side-by-side comparison with Warmup Inbox.
How does Warmup Inbox compare with other email verification and deliverability tools?
Warmup Inbox's GPA of 2.4 is higher than 6 of the 15 other email verification and deliverability tools we grade, and level with 8. It stands best on value for money (B, above 13 of 15) and worst on features (C, above 0).
Is Warmup Inbox good value for money?
ToolGPA grades Warmup Inbox B for value for money. Its paid plans start at $15 a month, against a middle price of $28 for the category: 0 of the 7 others that charge start lower. On features, ease of use and platforms it scores 2.3 out of 4, and no tool on the category's chart scores higher without costing more.
Could I make my own version of Warmup Inbox?
To replace Warmup Inbox you would be making a network of real inboxes that open and answer your emails. That is not a weekend's work, with an AI app builder or without one. It costs $180 a year. What you could not make: A network of real inboxes that open and answer your emails. Newsletters sent to thousands of people that still reach the inbox. It plugs into other products, Gmail, Google Workspace and Outlook among them, and has an API. AI features, unless you pay a model provider for each request yourself. This is a judgement from its listing. We have not built one.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Oct 18, 2026.