Warmbox alternatives · Cold Outreach
Free alternatives to Warmbox
Warmbox has no free plan. 8 of the 47 other cold outreach tools in this directory are free or have a free plan.
Warmbox is a paid product, starting at $15 per month for 1 inbox (the page's other billing toggle shows $19). All of them pair the free plan with paid ones.
8 tools · Listings checked up to Nov 12, 2026 · Where the facts come from
How each one differs from Warmbox
- Free plan · from $79/mo
Folderly
Email deliverability tools: placement tests, fixes and monitoring
What is free: Inbox Insights Free: 2 placement tests a month. Pulse, which monitors placement and sends alerts, is listed at $0 a month.
- Folderly starts at $79 per month (Inbox Insights); $96 per mailbox / month, billed yearly (Folderly). Warmbox starts at $15 per month for 1 inbox (the page's other billing toggle shows $19).
- Folderly has a free plan. Warmbox does not.
- Folderly also covers dMARC.
- Warmbox also covers inbox warm-up.
- Free plan · from $49/mo
EmailGuard
Email deliverability monitoring and domain masking for cold email
What is free: 1 connected domain, 3 email accounts, 50 contact verification credits a month and weekly blacklist monitoring. No domain masking proxies or hosted redirects.
- EmailGuard starts at $49 per month. Warmbox starts at $15 per month for 1 inbox (the page's other billing toggle shows $19).
- EmailGuard has a free plan. Warmbox does not.
- EmailGuard also covers email verification and dMARC.
- Warmbox also covers reports and inbox warm-up.
- Free plan · from $39/mo
Outplay
Multichannel sales outreach across email, phone, social and SMS
What is free: Free Forever: 2,000 active prospects a month, 2 mailboxes, manual email outreach, click-to-dial and the AI mail writer.
- Outplay starts at $39 per month, billed annually, for 1 seat. Warmbox starts at $15 per month for 1 inbox (the page's other billing toggle shows $19).
- Outplay has a free plan. Warmbox does not.
- Only Outplay lists iOS and Android apps.
- Only Outplay lists a browser extension.
- Free plan · from $27/mo
Lavender
AI email coach that scores and rewrites sales emails
What is free: Basic: analyze 5 emails and personalize 5 emails a month, with the AI email writer and recommendations on Gmail and Outlook 365.
- Lavender starts at $27 per month, billed yearly ($29 billed monthly). Warmbox starts at $15 per month for 1 inbox (the page's other billing toggle shows $19).
- Lavender has a free plan. Warmbox does not.
- Only Lavender lists a browser extension.
- Lavender also covers AI agents.
- Free plan · from $30/mo
ReachInbox
Cold email sequencer with unlimited mailboxes and AI warmup
What is free: 3 email accounts, 14 days of warmup, 50 active leads and 250 emails a month, and 500 AI word credits.
- ReachInbox starts at $30 per month for 10,000 emails, billed yearly. Warmbox starts at $15 per month for 1 inbox (the page's other billing toggle shows $19).
- ReachInbox has a free plan. Warmbox does not.
- ReachInbox also covers shared inbox, workflow automation and email campaigns.
- Warmbox also covers reports.
- Free plan · from $29/mo
Mixmax
Email sequences, tracking and meeting booking inside Gmail
What is free: 50 sequence recipients and 20 tracked emails a month, templates, follow-up reminders and booking without round robin. Emails carry a Mixmax signature; no AI or CRM sync.
- Mixmax starts at $29 per user / month for 100 recipients, billed yearly ($34 monthly). Warmbox starts at $15 per month for 1 inbox (the page's other billing toggle shows $19).
- Mixmax has a free plan. Warmbox does not.
- Only Mixmax lists a browser extension.
- Mixmax also covers templates, booking links and email campaigns.
- Free plan · from $15/mo
Yesware
Email tracking and outreach campaigns inside Gmail and Outlook
What is free: Basic open and attachment tracking for emails sent in the last 24 hours, 10 campaign recipients a month, a meeting scheduler with 2 event types and email support.
- Yesware starts at $15 per seat / month, billed annually ($19 billed monthly). Warmbox starts at $15 per month for 1 inbox (the page's other billing toggle shows $19).
- Yesware has a free plan. Warmbox does not.
- Only Yesware lists a browser extension.
- Only Warmbox lists a web app.
- Free plan · from $6/mo
Yet Another Mail Merge
Mail merge that sends from Gmail using a Google Sheets list
What is free: Up to 20 recipients a day, one user, with tracking and follow-ups but no scheduling.
- Yet Another Mail Merge starts at $6 per month, billed annually at $72 (Pro with a @gmail.com account, US billing). Warmbox starts at $15 per month for 1 inbox (the page's other billing toggle shows $19).
- Yet Another Mail Merge has a free plan. Warmbox does not.
- Yet Another Mail Merge also covers templates, spreadsheets and email campaigns.
- Warmbox also covers inbox warm-up.
Common questions
Is there a free alternative to Warmbox?
Yes. Folderly, EmailGuard, Outplay, Lavender, ReachInbox, Mixmax, Yesware and Yet Another Mail Merge are free or have a free plan.
Does Warmbox have a free plan?
Warmbox has no free plan. Warmbox is a paid product, starting at $15 per month for 1 inbox (the page's other billing toggle shows $19).
When was this checked?
Each listing shows its own date. On this page they run from Oct 17, 2026 to Nov 12, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.
This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Warmbox: the alternatives its listing names first, then the tools that share the most features with it.