# Warmbly review (2026): is it worth $23 a month, billed yearly? > Open-source cold email platform with mailbox warmup Checked Nov 13, 2026 ยท graded Nov 13, 2026 by ToolGPA. Warmbly is a cold email platform that warms mailboxes, sends campaigns across them and collects replies in one inbox. It also includes a CRM, a lead finder, an API and automations. The code is Apache 2.0 licensed, so you can self-host it or use the vendor's cloud. - **Category:** Email Verification & Deliverability - **Made by:** Warmbly - **Website:** https://warmbly.com - **Runs on:** Web - **Who should skip it:** Skip it if you want a free plan, as there is only a 14-day trial. - **Facts last checked:** Nov 13, 2026 ## Pricing As of Nov 13, 2026, Warmbly is a paid product with a free trial, starting at $23 per month, billed yearly ($29 billed monthly). - **Pricing model:** Free trial - **Free plan:** None. - **Free trial:** 14-day free trial, no credit card. | Plan | Price | What you get | | --- | --- | --- | | Starter | $23 per month, billed yearly ($29 billed monthly) | 150 cold emails a day, up to 4,500 a month; unlimited mailboxes and warmup, community support. | | Grow | $71 per month, billed yearly ($89 billed monthly) | 3,000 cold emails a day, up to 90,000 a month; adds CRM, API and webhooks, email support. | | Business | $263 per month, billed yearly ($329 billed monthly) | 15,000 cold emails a day, up to 450,000 a month; team roles, audit log, priority support. | | Agency | $199 per month, billed yearly ($249 billed monthly) | 150,000 sends a month shared by unlimited clients, with a white-label portal and $10 of shared AI. | | Agency Pro | $479 per month for 500,000 sends, billed yearly ($599 billed monthly) | Full white-label; 500,000 sends a month shared by every client, $30 of shared AI. | | Enterprise | Custom | Over 15,000 cold emails a day, custom contract and dedicated support; sold through sales. | Read from https://warmbly.com/pricing/ on Nov 13, 2026. Prices change, so confirm with Warmbly before buying. ## Ways to pay less - **20% off yearly billing** (Annual discount): The pricing page shows a Save 20% toggle for yearly billing, for example Starter at $23 instead of $29 a month. Source: https://warmbly.com/pricing/ ## Key features - **Mailbox warmup:** Warmup is unlimited on every paid plan and runs in a shared premium pool, ramping each mailbox's daily volume over time. - **Campaigns and unified inbox:** Sequences with follow-ups, branching and A/B tests send across mailboxes, and every reply lands in one inbox with labels. - **Inbox placement tests:** Analytics cover sends, replies, bounces and placement tests, and the dashboard shows a health score for each connected mailbox. - **CRM, lead finder and automations:** A built-in CRM tracks deals and tasks, a lead finder searches OpenStreetMap, and automations act when a reply arrives. - **Self-hosting:** The platform is Apache 2.0 licensed and can run on your own server, where warmup uses only the mailboxes you connect. ## Good for - Teams sending cold email from many mailboxes - Agencies running outreach for several clients - Teams that want to host their own cold email stack ## Worth knowing - Plans are capped by cold emails a day, with each mailbox limited to 50 a day by default. - The CRM and API need Grow or above, and team roles and audit log need Business. - Self-hosted warmup uses only the mailboxes you connect, not the cloud's shared pool. - Agency plans pool sends across clients; top-up packs of 50,000 sends cost $85 (Agency) or $60 (Agency Pro). ## ToolGPA grades **GPA: 2.2 out of 4**, graded Nov 13, 2026. Warmbly bundles mailbox warmup, cold campaigns, a shared inbox and placement tests, and the code is open source. Plans are capped by cold emails a day, and the CRM, API and team roles all sit on the dearer tiers. - **Value for money: C.** Starter is $23 a month billed yearly ($29 monthly), which is the category's middle figure. It covers 150 cold emails a day. - **Free plan and trial: C.** 14-day trial with no card. There is no free plan. - **Features: C.** Warmup, campaigns, unified inbox, placement tests, CRM and lead finder. The CRM and API need Grow ($71), and each mailbox defaults to 50 sends a day. - **Ease of use: C.** No rating on record. You connect mailboxes, set up warmup and build campaigns, and self-hosting is an option. - **Platforms and integrations: B.** Web app with four listed integrations, an API and webhooks from Grow. No desktop or phone app. These are ToolGPA's own grades. Graded from this listing, whose facts were read from Warmbly's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews. ## Where it stands among email verification and deliverability tools - Warmbly's GPA of 2.2 is higher than 23 of the 61 other email verification and deliverability tools we grade, and level with 13. - It stands best on platforms and integrations (B, above 28 of 61) and worst on features (C, above 0). - Its paid plans start at $23 a month, against a middle price of $21.50 for the category: 23 of the 43 others that charge start lower. - On features, ease of use and platforms it scores 2.3 out of 4. 7 tools score higher and cost less. The category's chart of price against score: https://toolgpa.com/charts/email-deliverability ## Keep it, or make your own? **Keep it.** To replace Warmbly 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 $276 a year. Warmbly is open source, so there is a third way: take its code and run it yourself. - You could not: A network of real inboxes that open and answer your emails. - You could not: Connections to other products, each kept working as those products change. A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it. ## Works with Google Workspace, Microsoft 365, Slack, SMTP / IMAP **Tags:** Inbox warm-up, Open source, Self-hostable, Public API, Workflow automation ## Alternatives - [Warmup Inbox](https://toolgpa.com/tools/warmup-inbox): Email warm-up through a network of real inboxes, priced per inbox. [Compare](https://toolgpa.com/compare/warmbly-vs-warmup-inbox) - [MailReach](https://toolgpa.com/tools/mailreach): Email warm-up and inbox placement tests, priced per mailbox. [Compare](https://toolgpa.com/compare/mailreach-vs-warmbly) - [Warmy](https://toolgpa.com/tools/warmy): Email warm-up with seed testing, verification and DMARC monitoring. [Compare](https://toolgpa.com/compare/warmbly-vs-warmy) - [InboxAlly](https://toolgpa.com/tools/inboxally): Email warm-up and reputation repair through a network of seed inboxes. [Compare](https://toolgpa.com/compare/inboxally-vs-warmbly) - [Mailwarm](https://toolgpa.com/tools/mailwarm): Email warmup service with deliverability guidance. [Compare](https://toolgpa.com/compare/mailwarm-vs-warmbly) ## Sources The prices, plans, platforms and features above were read from these pages on Nov 13, 2026: - https://warmbly.com/pricing/ - https://warmbly.com Page: https://toolgpa.com/tools/warmbly Listed by ToolGPA (toolgpa.com).