Communication
Best Email Verification APIs in 2026
ZeroBounce leads this list of 31 (8.6/10, free plan). BillionVerify is next (8.4/10, free plan), and Emailable is the next highest-placed option with a free plan (8.2/10). Email verification APIs check whether an address can receive mail and flag risky address types before you send. This list helps developers and teams compare verification services by published plans, platforms and checks.
- 01
ZeroBounce ZeroBounce may suit teams that need to validate bulk email lists or check addresses in real time, and those managing deliverability across multiple services.
From $6.58/mo Free plan Web · iOS · Android · API8.6 Visit Specs - 02
BillionVerify From $0.67/mo Free plan Web · API8.4 Visit Specs - 03
Bouncer From $25/mo Free trial Web · API8.4 Visit Specs - 04
CaptainVerify From $36/mo Free trial Web · API8.2 Visit Specs - 05
Emailable It suits marketers, developers, and teams that need bulk list cleaning, form-time validation, API access, or deliverability monitoring.
From $32.30/mo Free plan Web · API8.2 Visit Specs - 06
Clearout Email Verification Web · API · Browser extension8.1 Visit Specs - 07
Email Hippo From $9.88/mo Free trial Web · API8.0 Visit Specs - 08
EmailValidator Free plan Web · API8.0 Visit Specs - 09
emailverifier.dev Free plan Web · API7.9 Visit Specs - 10 InboxTrue Free plan Web · API7.9 Visit Specs
- 11
Mailbeam Mailbeam suits developers and teams who need email checks in signup flows or through a bulk upload.
From €19/mo Free plan Web · API7.9 Visit Specs - 12
MailboxValidator MailboxValidator suits teams that need to check individual addresses through an API or validate uploaded lists.
Free plan Web · API7.9 Visit Specs - 13
Abstract Email Validation API It suits developers adding email checks to signup flows or lead workflows, and teams that need bulk validation.
From $17/mo Web · API7.8 Visit Specs - 14 Byteplant Email Validator Free trial Web · API7.8 Visit Specs
- 15 Cloudmersive Email Verification API From $19.99/mo API · Self-hosted7.8 Visit Specs
- 16 DOTS Email Validation Free trial Web · API7.8 Visit Specs
- 17
EmailListVerify From €16/mo Web · API · Browser extension7.8 Visit Specs - 18 MailerCheck Free trial Web · API7.8 Visit Specs
- 19 QuickEmailVerification
QuickEmailVerification may suit marketers, developers, agencies, small businesses, startups, and enterprises that need to check individual addresses or process lists.
Free plan Web · API7.8 Visit Specs - 20
Reoon Email Verifier Reoon suits teams cleaning email lists, validating forms, or integrating verification through an API.
From $9/mo Free plan Web · API7.8 Visit Specs - 21 Email Validator Free plan Web · API7.7 Visit Specs
- 22
MillionVerifier It suits organizations that need to check single addresses or clean lists, including teams connecting verification to email services, CRMs, or signup forms.
Free trial Web · API7.7 Visit Specs - 23 Email List Validation From $14/mo Web · API7.6 Visit Specs
- 24 Reacher From €69/mo Free trial Web · API · Self-hosted7.6 Visit Specs
- 25 usecheck From $19/mo Free plan Web · API7.6 Visit Specs
Before choosing, compare free access and paid starting prices, then check support for real-time or batch verification, disposable, role-account and catch-all detection, plus SMTP mailbox checks.
Compare ZeroBounce and BillionVerify Get a place on this list