Compare/Head to head

Folderly vs MxToolbox

Same facts, side by side: starting price, free tier, MCP, API and what each one is actually built for.

Starting price

Folderly

$79/mo Free tier

Folderly tests email deliverability and monitors inbox placement. Inbox Insights has a free tier with 2 tests a month, then $79/mo for 100 tests.

Where Folderly fits

  • Outbound teams whose mail is landing in spam and need placement proof
  • RevOps watching DMARC and inbox placement across many domains
  • Agencies that want a deliverability report to show clients
  • Senders who already have warmup and now need monitoring

MxToolbox

$129/mo Free tier

MxToolbox is the free DNS and blacklist lookup site most email admins already know, with paid Delivery Center plans for DMARC, inbox placement and blacklist monitoring. It suits agencies that want to check a domain setup fast for free and, at scale, monitor every sender on their domains. The free plan covers 1 domain, paid plans start at $129/month, and no free trial is stated.

Where MxToolbox fits

  • Quick free checks of MX, SPF, DKIM and DMARC records
  • Checking whether a sending IP or domain is blacklisted
  • Teams moving a main domain to DMARC reject
  • Agencies monitoring third-party senders on client domains

At a glance

DetailFolderlyMxToolbox
Starting price$79/mo$129/mo
Free tier✓Yes✓Yes
MCP server–No–No
Public API–No✓Yes
Listed underDeliverabilityDeliverability

Where they pull apart

Folderly

Stands out: The product is placement and authentication (SPF, DKIM, DMARC, seed-list inbox tests), not a warmup bot and not a sequencer.

Watch out: Folderly does not send your campaigns. You still need Instantly, Smartlead, or Google Workspace as the actual mail server.

Not the right fit for

  • Teams that only need a $15 warmup mailbox
  • Buyers looking for a cold-email sequencer

MxToolbox

Stands out: Its free lookups need no account and check a sending IP against 100+ blacklists in seconds, which is quicker than signing up for a testing tool. Adaptive blacklist monitoring watches every third-party service sending as your domain, not only the IPs you list by hand.

Watch out: The jump from free to $129/month is steep, and both paid plans cap you at 5 domains, which a cold email setup with many domains can outgrow. There is no warm-up and inbox placement covers only Google, Yahoo and Outlook.com.

Not the right fit for

  • Cold email setups spread across more than 5 domains
  • Anyone needing mailbox warm-up
  • Small senders who want cheap paid monitoring

Pros and cons

Folderly

  • Inbox placement tests rather than warmup-only
  • Free tier with 2 placement tests a month
  • Useful when the problem is DNS and reputation, not copy
  • Does not send or warm the mail for you
  • Overlap with Instantly's built-in placement features

MxToolbox

  • Free lookups with no account
  • Blacklist check against 100+ lists
  • REST API for lookups and monitors
  • Paid plans start at $129/month
  • 5 domain cap on both paid plans
  • No warm-up or free trial stated

What each one costs

Folderly

$79/mo

Inbox Insights (placement tests before you launch) has a free tier with 2 tests a month, then $79/month for 100 tests, or $799 a year. The core Folderly deliverability product is $96 per mailbox per month on yearly billing. Pulse spam-placement alerts are free. Confirm current terms on the vendor site.

Checked 4 Nov 2026

MxToolbox

$129/mo

MxToolbox has a Free plan at $0/month with weekly blacklist monitoring of the top 30 lists for 1 domain. Delivery Center costs $129/month for 5 domains and 500,000 messages, with 30 inbox placement tests a month, DMARC reporting, complaint reporting, adaptive blacklist monitoring, mailflow monitoring, BIMI management and onboarding support. Delivery Center Plus costs $399/month and raises inbox placement tests to 100 a month and message volume to 5,000,000, and adds SPF flattening and advanced threat tools. Managed Services is custom priced and adds hands-on SPF, DKIM and DMARC setup and ongoing expert monitoring. The vendor does not state a free trial. Confirm current terms on the vendor site.

Checked 4 Nov 2026

Common questions

Is Folderly cheaper than MxToolbox?
Folderly starts lower, at $79/mo against $129/mo for MxToolbox. That is the entry plan on each side, so the real number depends on seats and the tier you land on.
Can you try Folderly or MxToolbox for free?
Folderly and MxToolbox carry a free tier on our listing.

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Editorial listings, never paid rankings. Prices checked 4 Nov 2026. Confirm current terms on the vendor site. Spot an error?