AT Valid vs Hunter.io
Last updated: September 2026
AT Valid is a dedicated email validation platform: 20+ checks per address, catch-all confidence grading, toxicity scoring and a List Quality Report on every job. Hunter.io is primarily an email finder and outreach tool, with verification as one feature among many. Here is a fair, sourced look at both.
TL;DR — A validation platform, not a side feature
AT Valid does one job and goes deep: 20+ verification checks per address, graded catch-all confidence (0–10), a toxicity index (0–5), a List Quality Report on every bulk job, recurring list monitors, and an encrypted 0-credit result cache — all with credits that never expire.
Hunter.io is primarily an email finding and cold-outreach platform; email verification is one feature of a much broader prospecting suite. If what you need is to find addresses you don’t have and run campaigns, Hunter.io is built for that. If you need to validate addresses in depth and protect deliverability, AT Valid is purpose-built for exactly that job — and many teams simply use both.
About AT Valid
AT Valid runs every address through AT Valid Score, an 11-step engine with 20+ checks: syntax and provider-specific username rules, DNS/MX/SPF/DMARC and a real DKIM probe, live SMTP mailbox verification with multi-pass greylist retry, graded catch-all confidence (0–10), a toxicity index (0–5), website/domain analysis, and disposable/free-provider and typo detection — reaching 99.5% accuracy.
On top of the engine, every bulk job produces a List Quality Report (health score, projected bounce rate, segments), recurring list monitors and a blacklist/RBL kit ship as part of the platform, and an encrypted result cache reuses recent validations at 0 credits. AT Valid also adds Have I Been Pwned breach intelligence (Enterprise), integrates natively with Salesforce, HubSpot, RD Station, Mailchimp, Pipedrive and Zapier, ships in 5 languages, and issues a public, verifiable ESG certificate — every new account starts with 200 free credits that never expire.
About Hunter.io
Hunter.io was founded in 2015 by Antoine Finkelstein and François Grante and is a well-known name in email prospecting. Its core products — Domain Search, Email Finder, Discover and Campaigns — help sales teams identify companies, find a specific person’s professional email address, and send cold email sequences.
Verification exists inside Hunter.io as the Email Verifier, returning a deliverability status and a confidence score on a unified credit system: per Hunter’s own help center and pricing page (September 2026), the free plan includes 50 credits per month, finding an address costs 1 credit and verifying one costs 0.5 credit, with monthly allowances that reset each month.
Feature comparison you can verify
Hunter.io facts below come from Hunter's own help center and pricing page as of September 2026. Where a number is not published, we say "not publicly documented" instead of guessing.
| Feature | AT Valid | Hunter.io |
|---|---|---|
| Primary job | Email validation and list hygiene — a dedicated platform, not a side feature | Email finding and cold outreach; verification is one feature inside a broader prospecting suite |
| Verification depth & accuracy | 11-step pipeline, 20+ checks per address (syntax, DNS/MX/SPF/DMARC, real DKIM probe, live SMTP, catch-all grading, disposable/free-provider lists, typo detection, role accounts, toxicity, DNSBL); 99.5% accuracy | Verifier returns a status and a confidence score; full check list and accuracy rate not publicly documented |
| Provider-specific username rules | Gmail, Outlook and other major providers’ username rules checked before any network call — an impossible address is rejected in ~1ms | Not publicly documented |
| Website & domain analysis | Detects a parked, for-sale, redirecting or ad-monetized website behind the domain | Not publicly documented |
| Catch-all confidence grading | 0–10 graded score (real name, corporate gateway, domain maturity) instead of a blind "unknown" | Not publicly documented |
| Toxicity index | 0–5 index combining spam-trap patterns, blacklisted/parked domains and no-reply addresses | Not publicly documented |
| Multi-pass greylist retry | 450/451 responses re-checked after a wait window, up to 3 passes for Enterprise — no extra credit charged | Not publicly documented |
| List Quality Report | Every bulk job gets a health score (A–F), projected bounce rate before/after cleaning, segments and a toxicity distribution | Not publicly documented |
| Recurring list monitors | Weekly, bi-weekly or monthly re-validation with delta reporting and webhook — included from the Growth plan | Not publicly documented |
| Blacklist / RBL monitor kit | Domain and IP blacklist/RBL monitoring with alerts and history, included in the platform | Not publicly documented |
| 0-credit encrypted result cache | An address already validated in the last 30 days (90 for disposable/dead-domain/typo) is reused at 0 credits; HMAC + AES-256-GCM encrypted | Not publicly documented |
| Real-time validation widget | 7 KB, zero dependencies, sub-status messages, clickable typo suggestions, per-IP anti-flood — drops into any signup form | Not publicly documented |
| Free single-address validator | Public tool, 10 checks/day, no signup required | Not publicly documented |
| Breach intelligence (HIBP) | Have I Been Pwned exposure signal (Enterprise) | Not publicly documented |
| Free credits | 200 on signup | 50 per month (per Hunter Help Center, Sept 2026) |
| Credit expiry | Credits never expire | Monthly allowance resets each month |
| Native integrations | Salesforce (AppExchange), HubSpot, RD Station, Mailchimp, Pipedrive, Zapier, webhooks | Zapier, Make and CRM integrations focused on outreach workflows |
| Platform interface languages | 5 — English, Portuguese, Spanish, Chinese, German | Not publicly documented |
| Verifiable CO₂-avoided certificate (ESG) | Yes — public, verifiable certificate | No comparable feature advertised |
| Email finder (Domain Search, Email Finder) | No — not offered | Yes — core product |
| Cold outreach campaigns | No | Yes — Campaigns module |
The six differences that actually matter
1. Different core jobs
Hunter.io answers "what is this person's email address?" AT Valid answers "will this address actually receive my email?" The first is prospecting; the second is deliverability — judging either tool by the other's job is unfair to both.
2. Verification depth and transparency
AT Valid publishes what it checks: a documented 11-step pipeline, 20+ named verifications, graded catch-all confidence, a toxicity index, and 99.5% accuracy. Hunter.io's verifier returns a status and confidence score but does not publicly document its full check list.
3. Deliverability built in, not sold separately
A List Quality Report on every bulk job, recurring list monitors, and a blacklist/RBL kit ship as part of the AT Valid platform — features some validation vendors sell as add-ons.
4. Pay once, reuse for free
An encrypted result cache reuses an address validated in the last 30–90 days at 0 credits, and greylist retries never cost extra — re-checking the same list doesn't mean paying twice.
5. Opposite credit models
Hunter.io's allowances reset every month — natural for continuous prospecting. AT Valid's 200 free signup credits and all purchased credits never expire — natural for list hygiene, which most teams run in periodic batches, not daily.
6. Brazil, languages and ESG
Native RD Station integration, a five-language platform interface, a design shaped by LGPD and GDPR, and a verifiable public CO₂ certificate — a combination we have not seen advertised elsewhere.
When Hunter.io is the better choice
- You need to find addresses you do not have. Domain Search and Email Finder are Hunter.io's core strength; AT Valid does not offer email finding at all.
- You want prospecting and outreach in one login. Company discovery, contact finding, verification and sending under one tool is Hunter.io's whole pitch, and it delivers on it.
When AT Valid is the better choice
- List hygiene at scale. Cleaning thousands or millions of existing addresses with 20+ checks per address, including catch-all and toxicity grading, is AT Valid's core job.
- Deliverability protection built in. Blacklist/RBL monitors and recurring list monitors ship with the platform, not as a separate add-on.
- A quality report you can act on. Every bulk job gets a health score, projected bounce rate and a plain-language reason per row.
- Not paying twice. An encrypted 0-credit cache and no-extra-charge greylist retries mean re-validating the same list doesn't cost double.
- LATAM and Brazil. Native RD Station integration, a Portuguese interface, and a product designed with LGPD in mind.
- Multi-language teams and ESG reporting. The platform interface ships in five languages, plus a public, verifiable CO₂-avoided certificate.
Pricing snapshot — September 2026
AT Valid gives every new account 200 free credits with no card required, paid packages start at $29 for 5,000 credits, subscriptions save roughly 20% versus one-off packages, credits never expire, and revalidating a recently-checked address costs 0 credits via the encrypted result cache. According to Hunter.io's published pricing (September 2026): the free plan includes 50 credits per month; the Starter plan costs $49 per month with 2,000 credits; the Growth plan costs $149 per month with 10,000 credits; annual billing carries roughly a 30% discount; and one verification consumes 0.5 credit.
Prices and plans change. Always confirm current figures on hunter.io/pricing and on the AT Valid pricing section before deciding.
Using both together
This is not an either/or decision. A workflow we see often: prospect and find addresses with Hunter.io, then run every list through AT Valid before it reaches your sending tool. Found addresses — even verified ones — age quickly, and a dedicated validation pass catches catch-all domains, disposable addresses and reputation risks right before they can hurt your bounce rate. Hunter.io fills the top of the funnel; AT Valid guards the send.
Adding AT Valid in 3 steps
- Create a free account. Sign up at app.atvalid.com and get 200 free credits — no credit card, and the credits never expire.
- Bring your addresses. Upload a CSV for bulk cleaning, call the real-time REST API, or connect Salesforce, HubSpot, Mailchimp, RD Station, Pipedrive or Zapier.
- Validate and send with confidence. Review the per-address results from 20+ checks, export or sync the clean list, and keep your sender reputation intact.
Frequently asked questions
Is AT Valid a full replacement for Hunter.io?
Only for the verification part. AT Valid is a dedicated email validation platform: 20+ checks per address, catch-all confidence grading, a toxicity index, and a List Quality Report on every job. Hunter.io is primarily an email finding and outreach platform — it does not find addresses or send campaigns. If you rely on Hunter.io for prospecting, keep it; if what you need is deep validation and list hygiene, that is exactly the job AT Valid was built for.
How is AT Valid different from Hunter.io’s Email Verifier?
AT Valid is a purpose-built validation platform with a published 11-step pipeline: provider-specific username rules, real SMTP checks, graded catch-all confidence (0–10), a toxicity index (0–5), multi-pass greylist retries, and an encrypted 0-credit result cache. Hunter.io’s verifier is one feature inside a broader prospecting suite; it returns a status and a confidence score, but its full check list and accuracy rate are not publicly documented.
What does AT Valid check that Hunter doesn’t publish?
AT Valid documents catch-all confidence grading (0–10), a toxicity index (0–5), website/domain analysis (parked, for-sale or redirecting sites), provider-specific username rules, and no-extra-charge multi-pass greylist retries. Hunter’s Email Verifier returns a status and a confidence score, but does not publicly document its full check list or an accuracy rate, so a deeper feature-by-feature comparison isn’t possible from public information alone.
Do I pay twice to re-validate the same list?
Not on AT Valid. An address already validated in the last 30 days (or 90 days for disposable, dead-domain and typo results) is reused from an encrypted result cache at 0 credits, and greylist retries never cost extra credit. Hunter’s public pricing does not describe an equivalent no-charge re-verification mechanism.
Can I use Hunter.io and AT Valid together?
Yes, and many teams do. A common workflow is to find addresses with Hunter.io, then run the list through AT Valid before any send to catch invalid, disposable, catch-all and risky addresses and protect sender reputation.
Do AT Valid’s free credits expire?
No. Every new AT Valid account receives 200 free credits and they never expire. Hunter.io’s free plan works differently: it grants 50 credits per month that reset monthly, according to Hunter’s own help center as of September 2026.
Does AT Valid find email addresses like Hunter.io does?
No. AT Valid does not offer email finding or a contact database. It validates addresses you already have — from signup forms, your CRM, or lists built with tools like Hunter.io.
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