Kickbox vs MailerCheck (2026): which should you pick?

Pick Kickbox if

• Fits if you check sign-ups in real time and want a sandbox to test against
• Works for teams on Braze, Iterable or Klaviyo who want checks built in

Look elsewhere if

• Pricey if you clean big lists, as a million checks cost $2,999
• Not for you if you need warm-up, placement tests or DMARC tools as well
• Watch out: Threat Score costs one more credit when it finds a signal, which can double the price of an address
• Tight if you want a monthly plan, as only one-off packs are listed
• Tight if you want to try it on a real list, as only the first 100 checks are free

Pick MailerCheck if

• Fits if you clean a list now and then and want credits that never expire
• Works for senders who also want an inbox placement check

Look elsewhere if

• Tight if you want to try it free, as it is 10 credits
• Skip it if you want smaller packs, since the minimum purchase is 1,000 credits
• Watch out: Email Insights and Inbox Placement cost 200 credits each and cannot be tried free
• Watch out: refunds are only given if the vendor ends the service without cause

Kickbox

• Only pay-as-you-go packs are listed; there is no monthly plan on the pricing page.
• Kickbox verifies addresses only; it has no warm-up, inbox placement testing or DMARC tools.
• Threat Score can double the cost per address when it finds a signal.

MailerCheck

• There is no free plan: new accounts get only 10 free credits, and the page's slider also lists a 100-credit free step.
• Purchases start at 1,000 credits; the pricing page says no discounts are offered beyond the bulk rates.
• The refund policy allows refunds only if the vendor ends the service without cause before the paid period ends.
• Email Insights and Inbox Placement cannot be tested on the free credits.

Kickbox

List verification

Upload a list and Kickbox sorts each address by deliverability; the vendor says 100,000 addresses take about an hour.

Verification API

Checks addresses at sign-up in real time, with a sandbox mode for testing without spending credits and a free endpoint for spotting disposable domains.

Threat Score

Flags addresses linked to abuse, complaints or a poor sending reputation, for one extra credit only when a threat signal is found.

Native integrations

Verifies lists inside Mailchimp, Klaviyo, HubSpot, Braze, Iterable, SendGrid and others, with more through Zapier.

Deliverability consulting

Deliverability audits and consulting from Kickbox's own team are offered as a separate service beside verification.

MailerCheck

Bulk list verification

Upload a list, then download the cleaned result with safe, risky and harmful addresses separated; duplicates are removed without being charged.

Real-time API

Validates addresses as they are collected, with an autopay option that tops up credits when a balance falls below a set threshold.

Result categories

Reports flag typos, catch-all and role-based addresses, disposable emails and full mailboxes.

Email Insights

Tests email content for spam words, broken links and blocklists before sending; costs 200 credits per test.

Inbox Placement

Predicts whether an email reaches the inbox or the spam folder at mailbox providers including Google, AOL and Yahoo; costs 200 credits per test.

Kickbox

• Pay as you go$5

  one-time for 500 verifications

  Larger packs cost less per check: $10 for 1,000, $70 for 10,000, $500 for 100,000 and $2,999 for 1 million. Unknown results are refunded.

• CustomCustom

  Volume pricing for more than 1 million verifications, through sales.

MailerCheck

• Pay as you go, 1,000 credits$10

  one-time, for 1,000 credits used as you go

  Minimum purchase is 1,000 credits. 1 credit verifies 1 email address and credits never expire.

• Pay as you go, 10,000 credits$80

  one-time, for 10,000 credits used as you go

  Per-credit cost falls with volume: $45 for 5,000, $175 for 25,000, $500 for 100,000 and $2,000 for 1,000,000.

Kickbox

• Nonprofit

  15% off for nonprofits

  Kickbox gives nonprofit organizations a 15% discount on verification.

MailerCheck

No public discounts listed.