Lemwarm vs Warmbox (2026): which should you pick?

Pick Lemwarm if

• Fits if you send cold email from a few inboxes and want them warmed up
• Works for lemlist users, since every lemlist plan already includes it

Look elsewhere if

• Skip it if you want to try it first, as there is no trial or free plan
• Pricey if you run many inboxes, because the price is per connected email address
• Too light for finding leads or sending campaigns, which need other tools
• Watch out: personalized warm-up emails and warming your own templates need Smart at $40 an inbox

Pick Warmbox if

• Fits if you send cold email from one or two new mailboxes and want a warm-up run in the background
• Works for agencies that connect many client inboxes and will ask for a custom plan

Look elsewhere if

• Skip it if you want a free try, because there is no trial or free plan
• Tight if you run more than 6 inboxes, as plans stop there and larger setups are custom
• Pricey if you add inboxes: $15 for 1 inbox becomes $69 for 3
• Watch out: the vendor says warm-up usually needs 15 to 30 days of uninterrupted running before results show
• Watch out: the pricing page doesn't say which billing period each of its two price sets applies to

Lemwarm

• Pricing is per connected email address, so the cost grows with each mailbox.
• The Smart plan is needed for personalized warm-up emails and warming up your own templates.
• The pricing page lists no free plan or free trial.
• Teams of more than 10 users are quoted individually.

Warmbox

• 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.

Lemwarm

Automatic warm-up

Connects an inbox and exchanges warm-up emails with a network of 20,000+ domains in 100+ countries, which the vendor describes as real inboxes.

Deliverability score and alerts

Tracks a deliverability score and sends alerts about spam risks based on your sending behavior and content.

Technical setup check

Looks for missing or misconfigured SPF, DKIM, DMARC and MX records, which the vendor lists as a common cause of poor inbox placement.

Daily tips and reports

Gives daily advice on content, sending and setup, with detailed deliverability reports available at any time.

Template warm-up on Smart

The Smart plan can warm up your real email templates and use personalized warm-up emails and an industry-matched network.

Warmbox

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.

Lemwarm

• Essential$24

  per email / month, billed yearly ($29 billed monthly)

  Automatic warm-up, a technical setup check, deliverability reports and human warm-up emails. A quarterly option saves 10%.

• Smart$40

  per email / month, billed yearly ($49 billed monthly)

  Adds personalized warm-up emails, warm-up of your own email templates, custom alerts and a network tailored to your industry.

• More than 10 usersCustom

  Everything in Smart with volume pricing and priority support, sold through sales.

Warmbox

• 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.

• TeamCustom

  Custom plans for larger sending volumes, quoted through the vendor's chat.

Lemwarm

• Annual discount

  Save 20% with yearly billing

  Yearly billing is marked 20% off the monthly price, and quarterly billing is marked 10% off.

• Other savings

  Included with every lemlist plan

  The pricing page says every lemlist plan includes lemwarm at no extra charge.

Warmbox

No public discounts listed.