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

Pick Folderly if

• Fits if you send B2B email from a handful of mailboxes and care where it lands
• Works for teams on Google Workspace or Outlook

Look elsewhere if

• Pricey if you run many mailboxes: it's charged per mailbox, from $96
• Tight if you stay free: 2 placement tests a month
• Watch out: DMARC is a pilot and Mirror is in beta, so availability may be limited
• Not for you if you want a warm-up service, as the page says it isn't one

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

Folderly

• Prices differ by product, and the page says plans and access vary by product.
• Folderly is priced per mailbox, with a minimum commitment, and monthly-billing prices are not shown on the page.
• DMARC is a pilot and Mirror is in beta, so availability may be limited.
• The page says Folderly is not a standard warm-up service.

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.

Folderly

Placement monitoring

Daily test emails show where messages land across providers, with placement reports and technical and content triggers for Gmail and Outlook.

Inbox Insights

Tests inbox placement and reviews sending IPs and DNS records before a campaign.

Pulse alerts

Tracks placement over time and sends alerts by email, Slack, SMS and other channels; listed as free.

DMARC pilot

Folderly DMARC turns aggregate DMARC reports into a domain and source view; the page says it is available through a pilot.

Lens, Mirror and Flash

Lens checks DNS and blocklist signals, Mirror previews email HTML (beta), and Flash tests a real message.

Folderly AI

Drafts campaigns from an offer, audience and goal, then points to the checks the email needs.

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.

Folderly

• Inbox Insights Free$0

  2 inbox placement tests a month, with IP and DNS checks.

• Inbox Insights$79

  per month for 100 tests

  100 tests a month; $799 a year on yearly billing.

• Folderly, 1-9 mailboxes$96

  per mailbox / month, billed yearly

  Sender reputation upkeep and placement monitoring; a minimum commitment applies.

• Folderly, 10-24 mailboxes$72

  per mailbox / month, billed yearly

  Same product at a lower per-mailbox rate.

• Folderly, 25-99 mailboxes$56

  per mailbox / month, billed yearly

  Same product at the lowest published per-mailbox rate.

• Folderly, 100+ mailboxesCustom

  Custom per-mailbox pricing, requested through a demo.

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.

Folderly

• Annual discount

  Yearly billing saves 20% on Folderly

  Folderly's pricing shows a 20% saving on yearly billing for the mailbox-based product, and 15% on yearly Inbox Insights ($799).

Warmbox

No public discounts listed.