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

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

Pick ZeroBounce if

• Fits if you want list cleaning, warm-up and DMARC for one domain on one bill
• Works for developers who want an API with SDKs in 16 languages, or checks from an iPhone or iPad

Look elsewhere if

• Pricey if you only need a list cleaned, at about $129 for 10,000 checks
• Tight if you send from several domains, as ONE watches DMARC for just one
• Watch out: unused tests, monitors and warm-up seeds on ONE don't roll over, only verification credits do
• Watch out: the free 100 checks a month need a business email domain at sign-up
• Not for you if you're on Android or a desktop, as the only app is for iPhone and iPad

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.

ZeroBounce

• Warm-up and DMARC monitoring come only with ZeroBounce ONE, and it covers a single DMARC domain.
• Unused tests, monitors, searches and warm-up seeds on ONE do not roll over; only verification credits do.
• The FAQ says credits never expire with an active ONE subscription; otherwise expiry rules may apply depending on when they were bought.
• The free credits need a business or premium email domain at sign-up.

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.

ZeroBounce

Email validation

Checks lists by file upload or real-time API and flags invalid, catch-all, disposable, role-based, abuse and spam-trap addresses. Unknown results and duplicates are free.

AI scoring

An AI model scores each address for quality at one extra credit, which helps decide whether to send to catch-all and other uncertain addresses.

Email Finder

Finds a person's work address from a name and company domain, at 20 credits per successful search; unknown results cost nothing.

Warm-up and placement tests

ZeroBounce ONE includes warm-up through a seed network, inbox placement tests against 20+ providers and email server tests.

Blacklist and DMARC monitoring

Monitors IPs and domains on blacklists and gathers daily DMARC reports for one domain on the ONE plan.

API, SDKs and iOS app

A validation and scoring API with SDKs in 16 languages, an MCP server, and an iOS app for checking lists from an iPhone or iPad.

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.

ZeroBounce

• Freemium$0

  100 verification credits that refill each month, one inbox placement test, one server test and one blacklist monitor.

• Pay-As-You-Go$39

  one-time for 2,000 credits

  The minimum purchase. Per-credit rates fall with volume: about $129 for 10,000 ($0.0129 each) and $0.0032 each at 1 million.

• ZeroBounce ONE$79

  per month for 10,000 credits, billed annually ($99 monthly)

  Credits roll over, plus 250 warm-up seeds, 100 inbox tests, 100 server tests, 10 blacklist monitors, 1 DMARC domain and 15% off extra credits.

• EnterpriseCustom

  Purchases or subscriptions of more than 1 million credits, with onboarding and training.

MailerCheck

No public discounts listed.

ZeroBounce

• Annual discount

  20% off ZeroBounce ONE billed annually

  ZeroBounce ONE costs $79 a month when paid annually in one charge, against $99 billed monthly.