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

Pick Mailfloss if

• Fits if your list lives in Mailchimp, Klaviyo or another platform it plugs into
• Works for lists that need cleaning every day without uploads

Look elsewhere if

• Tight if you stay free, as 500 verifications a month runs out fast
• Not for you if your platform isn't supported, because you'd use prepaid credits instead
• Watch out: the 7-day trial needs a credit card and the plan starts on day 8
• Pricey if you want more platforms, as Lite connects one and Business ten

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

Mailfloss

• Subscription plans need a supported email platform; others must use prepaid credits.
• A credit card is required for the 7-day trial, and the plan starts on day 8.
• Prices on the page are read as monthly; the page offers an annual option that saves 17%.
• Only the entry credit step of each plan shows a price in the page text read here.

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.

Mailfloss

Typo Fixer

Recognizes more than 250 typo patterns in email domains and corrects the address in place instead of deleting the subscriber.

Signup verification

Instafloss checks each new signup as it arrives and screens out fake, disposable, role-based and dead addresses.

Daily list cleaning

Autofloss scans new subscribers every day and removes those that fail validation, with custom keep and remove rules.

Decay protection

Re-checks older subscribers on a schedule, since addresses on a list go bad over time.

Prepaid credits

For lists outside a supported platform, credits are bought once, never expire, and are used by uploading a file.

API and Zapier

Every subscription plan lists a real-time API, webhooks and a Zapier integration.

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.

Mailfloss

• Lite$29

  per month for 10,000 credits, billed monthly

  Connects 1 email platform. Credits step up to 510,000 a month at a higher price; higher steps are not priced on the page.

• Business$59

  per month for 25,000 credits, billed monthly

  Connects 10 email platforms. Credit steps run up to 525,000 a month at higher prices.

• Pro$209

  per month for 125,000 credits, billed monthly

  Unlimited email platforms, priority human support and single sign-on. Credit steps run up to 625,000 a month.

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.

Mailfloss

• Annual discount

  Save 17% with annual billing

  The pricing page has a Monthly/Annual toggle labeled Save 17%. The annual prices were not readable in the page text.

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.