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Email validation API alternatives
Each page below says when ContactLint is a good alternative and when the other tool is the better pick. The main difference is always the same: these vendors verify mailboxes over SMTP and ContactLint does not.
- ZeroBounce alternative: also offers list cleaning, AI scoring, email finder, warmup, inbox placement tests, blacklist and DMARC monitoring.
- Kickbox alternative: also offers list cleanup, a 0 to 5 risk score add-on, integrations and deliverability services.
- Abstract API alternative: also offers quality score, sender and domain enrichment, breach data and other APIs such as IP geolocation.
- Emailable alternative: also offers bulk list verification, a 0 to 100 quality score, data enrichment, inbox placement and blacklist monitoring, 50+ app integrations.
- ContactLint vs ZeroBounce, NeverBounce, Kickbox and Bouncer (pricing table).
All four at a glance
| ContactLint | ZeroBounce | Kickbox | Abstract API | Emailable | |
|---|---|---|---|---|---|
| Confirms the mailbox exists (SMTP) | No. Syntax, DNS/MX, disposable, role and typo checks only; no SMTP connection, no catch-all detection | Yes, sold as email validation with catch-all validation included (source) | Yes, sold as email verification; accept-all domains flagged as risky (source) | Yes, a live SMTP check without sending a message, plus catch-all flags (source) | Yes, SMTP verification and accept-all detection (source) |
| Smallest purchase | 5,000 checks for $9 | $39 for 2,000 addresses (minimum pay as you go purchase) (source) | 500 verifications for $5 (source) | Starter at $17 a month billed annually, 5,000 requests a month (source) | 5,000 credits for $38 (minimum purchase) (source) |
| 5,000 checks | $9 | Not listed | $40 (source) | $17 a month billed annually (Starter, 5,000 requests a month) (source) | $38 (source) |
| 25,000 checks | $35 | Not listed | $150 (source) | Not listed | Not listed |
| 100,000 checks | $99 | Not listed | $500 (source) | Not listed | Not listed |
| Free to start | 100 checks every month, no card | 100 free validation credits a month, conditions marked on their page (source) | First 100 verifications free (source) | 100 requests, no card (source) | 250 credits for new accounts (source) |
| Unknown results | Not charged: any check whose DNS lookup fails is given back | Not charged (source) | Credit refunded (source) | Not listed | Unknowns and duplicates refunded when a list finishes (source) |
| Credits expire? | No expiry in our terms; unused credits refundable within 14 days | Never while on ZeroBounce ONE; otherwise expiration rules may apply (source) | Not listed | Plan requests are per month or per year (source) | Never (source) |
| Typo suggestions | Yes, did_you_mean for major providers (gmial.com to gmail.com) | Yes, a did_you_mean field in the API (source) | Yes, typo detection at capture (source) | Yes, a suggested_correction field (source) | Yes, misspelled domain corrections (source) |
| MCP server for AI agents | Hosted remote server at /mcp, nothing to install | Official open-source server you install locally with npm (Node 18 or newer) (source) | Not listed on the pages we read | No official server listed; a third-party open-source server exists (source) | Not listed on the pages we read |
| Phone validation | Yes, same key and same credits | Not listed | Not listed | Separate Phone Validation API with its own plans (source) | Not listed |
Competitor facts read from each vendor's public pages on October 17, 2026 and linked in each cell. Prices change; follow the links for current terms. "Not listed" means the page we read did not state it, not that the vendor lacks it.
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