# Warmbox review (2026): is it worth $15 a month? > Email warm-up through a private network of inboxes Checked Nov 12, 2026 ยท graded Nov 12, 2026 by ToolGPA. Warmbox is an email warm-up service. It exchanges automated messages between your mailbox and a network of its own inboxes, opens and replies to them, and pulls warm-up mail out of spam, with the aim of building sender reputation. It connects to Gmail, Outlook and other providers, and includes DNS and blacklist checks and a deliverability dashboard. - **Category:** Cold Outreach - **Made by:** Warmbox - **Website:** https://www.warmbox.ai - **Runs on:** Web - **Who should skip it:** Skip it if you want a free try, because there is no trial or free plan. - **Facts last checked:** Nov 12, 2026 ## Pricing As of Nov 12, 2026, Warmbox is a paid product, starting at $15 per month for 1 inbox (the page's other billing toggle shows $19). - **Pricing model:** Paid - **Free plan:** None. - **Free trial:** None listed. | Plan | Price | What you get | | --- | --- | --- | | 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. | | Team | Custom | Custom plans for larger sending volumes, quoted through the vendor's chat. | Read from https://www.warmbox.ai/pricing on Nov 12, 2026. Prices change, so confirm with Warmbox before buying. ## Key features - **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. ## Good for - Cold emailers warming a handful of new mailboxes - Agencies that need several client accounts in one place - Senders using providers beyond Gmail, including SMTP mailboxes ## Worth knowing - 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. ## ToolGPA grades **GPA: 1.8 out of 4**, graded Nov 12, 2026. Warmbox sends warm-up traffic between mailboxes so a new sending address builds reputation. It warms inboxes and nothing else, the vendor says results take 15 to 30 days, and anything bigger than a few inboxes means a custom plan. - **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. - **Free plan and trial: F.** No free plan and no trial is listed. A free blacklist and DNS checker is the only free part. - **Features: D.** It 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: C.** No 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: B.** Web only, but it works with Gmail, Google Workspace, Microsoft 365, Yahoo, SendGrid, Mailgun, Amazon SES and Zoho inboxes. These are ToolGPA's own grades. Graded from this listing, whose facts were read from Warmbox's own pages on 12 November 2026. Not based on using the product, and shorter than our full reviews. ## Where it stands among cold outreach tools - Warmbox's GPA of 1.8 is higher than 5 of the 47 other cold outreach tools we grade, and level with 3. - It stands best on value for money (B, above 29 of 47) and worst on free plan and trial (F, above 0). - Its paid plans start at $15 a month, against a middle price of $39 for the category: 5 of the 43 others that charge start lower. - On features, ease of use and platforms it scores 2.0 out of 4. 1 tool scores higher and costs less. The category's chart of price against score: https://toolgpa.com/charts/cold-outreach ## Keep it, or make your own? **Keep it.** To replace Warmbox 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. That makes this kind of software worth paying for, not this one in particular: 39 of the 47 other cold outreach tools grade higher. It costs $180 a year. - You could make: Reports: an app builder makes this well. - You could not: A network of real inboxes that open and answer your emails. - You could not: It plugs into other products, Gmail, Google Workspace and Microsoft 365 among them. - You could not: AI features, unless you pay a model provider for each request yourself. A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it. ## Works with Gmail, Google Workspace, Microsoft 365, Yahoo, SendGrid, Mailgun, Amazon SES, Zoho **Tags:** Inbox warm-up, Reports, AI features ## Alternatives - [Mailivery](https://toolgpa.com/tools/mailivery): Email warm-up priced by daily volume, with unlimited mailboxes. [Compare](https://toolgpa.com/compare/mailivery-vs-warmbox) - [Folderly](https://toolgpa.com/tools/folderly): Email deliverability tools: placement tests, fixes and monitoring. [Compare](https://toolgpa.com/compare/folderly-vs-warmbox) - [Instantly](https://toolgpa.com/tools/instantly): Cold email from unlimited inboxes, priced by emails and contacts. [Compare](https://toolgpa.com/compare/instantly-vs-warmbox) - [Smartlead](https://toolgpa.com/tools/smartlead): High-volume cold email with unlimited mailboxes and client workspaces. [Compare](https://toolgpa.com/compare/smartlead-vs-warmbox) - [Saleshandy](https://toolgpa.com/tools/saleshandy): Cold email sequences with a B2B lead database in every plan. [Compare](https://toolgpa.com/compare/saleshandy-vs-warmbox) ## Sources The prices, plans, platforms and features above were read from these pages on Nov 12, 2026: - https://www.warmbox.ai/pricing - https://www.warmbox.ai - https://www.warmbox.ai/about-us Page: https://toolgpa.com/tools/warmbox Listed by ToolGPA (toolgpa.com).