Warmbly
Warmbly: A flexible cold email platform for self-hosters that want control over sending and inbox workflows. Ranked #17 of 35 in Cold Email Software by our editors (7.8/10); pricing: Free plan; best for self-hosters needing deliverability controls.
At a glance
- Editor score7.8 / 10
- PricingFree plan
- Best forSelf-hosters needing deliverability controls
- Free planYes
- Paid from$29/mo
- Email warm-upYes
- Facts checked19 Sep 2026
Where it wins
- Self-hosting under Apache 2.0 with hosted workspace options
- Warm-up pools, mailbox rotation, and deliverability analytics
- Branching sequences with reply detection and automatic stopping
Where it doesn't
- Hosted pricing rises from $29 to $329 per month across paid tiers
- Self-hosting requires the operator to manage deployment and maintenance
- Enterprise access uses custom volume and contract pricing
Our verdict on Warmbly
Warmbly is an open-source cold email platform for founders, agencies, sales teams, recruiters, and fundraisers. It combines mailbox warm-up, multi-step sequences, sender-pool rotation, reply classification, a unified inbox, deliverability analytics, CRM workflows, integrations, and an API. Buyers can self-host it under Apache 2.0 or use a hosted workspace. The free workspace supports up to 10 mailboxes with warm-up, while paid plans focus on daily sending volume. It is most suitable for teams that want direct control over outreach infrastructure and inbox behavior rather than a narrowly focused campaign sender.
Its strongest area is deliverability workflow depth. Warmbly offers automated warm-up with shared warmup pools, per-lead mailbox rotation, inbox placement and complaint analytics, and automatic sequence stopping after replies, bounces, or opt-outs. Sequences support branching, and the unified inbox classifies replies, bounces, and out-of-office messages. AI-generated personalized email snippets add another personalization option. The Starter plan costs $29 per month and includes 150 emails per day, unlimited mailboxes, unlimited warmup, reply detection, and branching sequences. Grow costs $89 per month and adds 3,000 emails per day, CRM pipelines, deals and tasks, API access, HMAC-signed webhooks, and a custom tracking domain.
The higher tiers are aimed at larger operations. Business costs $329 per month for 15,000 emails per day, sending kept apart from other customers, team roles, an audit log, and priority support. Enterprise supports 15,000+ emails per day with custom volume and contract terms, plus SSO/SAML, SCIM, a dedicated CSM, and an SLA. Integrations include HubSpot, Salesforce, Pipedrive, Close, Zapier, Make, n8n, Slack, Discord, Calendly, Cal.com, and Google Sheets. Choose Warmbly if self-hosting, sender rotation, and detailed stopping rules matter; choose an alternative if you want a simpler hosted tool with less infrastructure responsibility.
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Warmbly pricing
All 4 Warmbly plans and prices →
Warmbly fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $29/mo |
| Email warm-up | Yes |
| Mailbox rotation | Yes |
| Multichannel outreach | Not verified |
| Sequence steps | Not verified |
| Daily send limit | 100 /day |
| Reply detection | Yes |
| Personalization features | Ai |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Integrations | 12 integrations: HubSpot, Salesforce, Pipedrive, Close, Zapier, Make … |
| Pricing | Free plan (source) |
| Website | warmbly.com |
| Facts checked | 19 Sep 2026 |
Warmbly integrations
Warmbly lists 12 integrations on its own site.
- HubSpot
- Salesforce
- Pipedrive
- Close
- Zapier
- Make
- n8n
- Slack
- Discord
- Calendly
- Cal.com
- Google Sheets
Alternatives to Warmbly
- SmartReach.ioStrong entry pricing for teams coordinating email, LinkedIn, calls, and WhatsApp outreach.9.4
- SmartleadA paid cold email platform built for high-volume, multichannel outbound campaigns.9.3
- WoodpeckerA cost-conscious outbound platform with strong deliverability and sequence controls.9.2
See all Warmbly alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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