Warmbly
Warmbly is the open-source platform for cold email: warm your mailboxes, send campaigns, and triage every reply. Run it on our cloud or self-host the whole thing.
Warmbly launched on July 16, 2026 with 8 votes, #2,235 of 24,623 launches that month and more than 90% of that year's launches.
In plain words
Warmbly is an open-source platform designed for cold email outreach. It allows users to warm mailboxes, send campaigns, and automatically sort replies using AI automations and agents. The platform offers real-time collaboration features and can be run on Warmbly's cloud or self-hosted. Users can build sending workflows on a visual canvas, set customized sending windows, and manage email distribution to protect sender reputation. It's built for sales teams looking to improve cold outreach effectiveness.
written from the facts on this page · September 2026
From the sources
The open-source platform for modern cold outreach, built with AI automations, real-time collaboration, agents, and email warmup.
Warmbly warms your mailboxes, sends your campaigns, and triages every reply. Run it on our cloud or self-host the whole thing on yours. Build the flow on a canvas and fork it on opens, clicks and replies. We help teams like yours land more cold replies without burning sender reputation. Draw a sending window on any weekday. Drag to move it, grab an edge to resize. Each day is independent — set different windows per day, or several windows in one day. Sends are scheduled in (UTC-05:00) America/New_York; worker IPs spread distribution naturally. Optional bounds for when the campaign may send. Leave both blank to run open-ended. Replies from every mailbox stream into one queue, labeled on…from warmbly.com
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