SFDIFY
The best email verification tools for cleaning a list before a campaign or cold outreach are Bouncer and Emailable if you want the lowest pay-as-you-go price, since both list 10,000 verifications at $60 [1] [2]. ZeroBounce fits teams that want catch-all scoring and a bigger toolkit, starting at $39 for 2,000 verifications [3]. Kickbox, NeverBounce and Hunter round out the list, with Hunter making most sense if you already find leads there.
High bounce rates hurt your sender reputation for every campaign that follows. All six tools below sort addresses into valid, invalid, risky or unknown; they differ on price, credit expiry, catch-all handling and integrations.
How we chose
We compared six widely used services on entry price, price at 10,000 verifications, billing model, free credits, credit expiry, catch-all handling and API or integration options. Everything comes from each vendor's homepage and pricing page, checked on 2026-11-08. We did no hands-on testing; confirm prices before you buy.
Comparison table
| Product | Best for | Starting price | Notable |
|---|---|---|---|
| Bouncer | Low-cost bulk cleaning with credits that keep | $8 for 1,000 credits [1] | Credits never expire; no charge for duplicates or unknowns [1] |
| Emailable | Low per-credit price at 10,000+ | $38 for 5,000 credits [2] | 5,000-credit minimum; 250 free credits [2] |
| ZeroBounce | Catch-all scoring and a wider deliverability toolkit | $39 for 2,000 validations [3] | AI scoring ranks catch-all emails 1–10 [4] |
| Kickbox | Small top-ups and compliance-minded teams | $10 for 1,000 [5] | Unknown results refunded; SOC II certified [5] |
| NeverBounce | Ongoing CRM sync on a monthly plan | $8 for 1,000 credits [6] | Pay-as-you-go credits expire after 12 months [6] |
| Hunter (Email Verifier) | Cold outreach teams already finding leads in Hunter | Free plan with 50 credits per month [7] | 0.5 credit per verification [7] |
Bouncer — cheapest entry with credits that never expire
Bouncer is a pay-as-you-go email verification service suited to marketers who clean lists in bursts rather than on a schedule.
Verified features: Bouncer lists "Deep Catch-All Verification" among its core features [8]. It offers an email verification API with "multiple endpoints both synchronous and asynchronous" [8], plus integrations with marketing platforms.
Pricing: The minimum purchase is 1,000 credits, and "you can start as low as $8" for that volume [1]. 10,000 credits cost $60 [1]. You can also subscribe to receive the same amount of credits each month, and those credits "will also never expire" [1]. New accounts get "100 free credits for a start" [1].
Strengths: Its price at 10,000 is tied for the lowest here. Bouncer "will never charge for duplicated email addresses within your list, nor for 'unknown' results" [1], so you only pay for definitive answers.
Limitations: The free allowance (100 credits) is smaller than Emailable's 250. Deliverability tools such as inbox placement tests sit in a separate Deliverability Kit subscription that starts at $25 per month [1], so it is not an all-in-one bundle like ZeroBounce ONE. The pages we checked do not publish an integration count.
Best fit: Small marketing teams and agencies that verify irregular batches and want the lowest predictable cost per 10,000 without a monthly commitment.
Emailable — low price per credit once you buy 5,000+
Emailable competes mainly on price at mid volumes.
Verified features: Emailable includes "Accept-All Detection" to identify addresses on servers that "appear to accept all emails, but can still cause bounces" [9]. It says you can "verify emails from 50+ apps including ActiveCampaign, Brevo, HubSpot, Mailchimp, Salesforce" [9], and it offers an HTTP API with client libraries in Node.js, Ruby and Python plus unlimited API keys [9].
Pricing: The page's published offers list 5,000 credits for $38 and 10,000 credits for $60 [2]. One credit equals one verification, and "the minimum number of credits you can purchase is 5,000" [2]. You can "pay as you go, or save 15% with a subscription" [2]. Every new account "starts with 250 credits" [2].
Strengths: Credits never expire, and with a subscription "unused credits from the previous period will roll over" [2]. Duplicates and Unknown results are refunded to your balance [2].
Limitations: The 5,000-credit minimum means you cannot buy a small top-up of 1,000 addresses the way you can at Bouncer or Kickbox. Speed and accuracy claims across this category come from vendors, not independent benchmarks.
Best fit: Teams that verify 5,000 or more addresses at a time and want broad integrations with email and CRM tools.
ZeroBounce — catch-all scoring and the widest toolkit
ZeroBounce goes beyond a yes-or-no check, which matters if much of your B2B list sits on catch-all domains.
Verified features: ZeroBounce says it can "validate all, including catch-all emails and addresses protected by SEGs (Secure Email Gateways)" [4]. Its AI scoring "ranks each address from 1–10 based on the likelihood of reaching a real person" and covers catch-all addresses [4]. You can validate "in bulk or in real time with our API" [4], and it lists "40+ integrations" [4]. ZeroBounce advertises "99.6% Validation Accuracy Guaranteed" [3]; treat that as the vendor's own claim.
Pricing: Pay as you go "starts at $39 USD for validating 2,000 email addresses," which is the minimum purchase [3]. The ZeroBounce ONE subscription "is available at $99 USD a month" [3], with a minimum of 10,000 credits [3]. The free tier gives "100 free monthly email verifications when you sign up with a business/premium domain" [3].
Strengths: ZeroBounce will "never charge you for 'unknown' results" or for removing duplicates [3]. The ONE plan bundles warmup, inbox placement tests and blacklist monitoring, and unused credits roll over each month [3].
Limitations: It has the priciest entry point here. Scoring costs an extra credit per address, so validating and scoring one email uses two credits [3]. Without a ONE subscription, "expiration rules may apply" to credits [3].
Best fit: B2B sales teams with many catch-all addresses who want help deciding which risky contacts are still worth emailing, and teams that would use the bundled deliverability tools.
Kickbox — simple tiers and compliance credentials
Kickbox keeps pricing to a flat table.
Verified features: Kickbox sorts results into Deliverable, Risky and Undeliverable, and places "Accept-all domains" in the Risky group alongside disposable and role-based addresses [10]. It offers list verification plus an email verification API that blocks invalid emails and detects typos in real time [10]. Kickbox says it is "fully GDPR-compliant and SOC II certified" [5].
Pricing: "Your first 100 verifications are free" [10]. Paid tiers start at 500 for $5, then 1,000 for $10 and 10,000 for $70 [5]. If Kickbox "can't provide a definitive result," it refunds the credit [5].
Strengths: Small top-ups are possible, and the SOC II statement helps with vendor security reviews.
Limitations: At $70 for 10,000 it costs more than Bouncer or Emailable at the same volume [5]. Accept-all addresses are flagged as risky rather than scored.
Best fit: Teams that need frequent small top-ups or have a vendor-security checklist to satisfy.
NeverBounce — monthly plan with CRM auto-sync
NeverBounce describes itself as "a Real-Time Email Verifier and Email List Cleaner" [11].
Verified features: You can upload lists or "connect to over 85 integrations" [11]. Real-time verification works at the point of entry on forms [11], and API wrappers cover cURL, NodeJS, PHP, Python, Ruby, Go, Java and .NET [11]. The pay-as-you-go tier includes automatic typo fixes and works "with Zapier, n8n, HubSpot, Mailchimp, and more" [6].
Pricing: Pay as you go starts at $8 for 1,000 credits [6]. The Growth plan is $49 per month for "up to 10,000" and adds CRM auto-sync, AI scoring and 200 AI-picked leads per month [6].
Strengths: The Growth plan suits teams whose CRM fills up every day, since it cleans new records automatically and says you "only pay for new, unique emails - duplicates are free" [6].
Limitations: Pay-as-you-go "credits expire 12 months after purchase" [6], unlike Bouncer or Emailable. The pages we checked do not explain how catch-all addresses are handled or priced.
Best fit: Sales and marketing ops teams that want verification running in the background on CRM records every month.
Hunter (Email Verifier) — for cold outreach teams already in Hunter
Hunter is mainly an email finder and outreach platform; its Email Verifier draws on the same credits.
Verified features: The verifier checks format, flags gibberish, disposable, webmail and accept-all addresses, then "looks up the domain's MX records and runs a live check against its SMTP server" [12]. Hunter says it can verify "accept-all addresses with several major email providers using a proprietary solution" [12]. You can verify from an API, a bulk upload or a Google Sheets add-on [12].
Pricing: "0.5 credit = 1 email verified" [7]. The Free plan includes 50 credits per month (about 100 verifications), and Starter is $49 per month billed monthly for 2,000 credits [7], or roughly 4,000 verifications. Growth is $149 per month for 10,000 credits [7]. If Hunter fails to verify an address, no credit is used [7].
Strengths: One subscription covers finding, verifying and sending, so cold outreach teams avoid a second vendor.
Limitations: Monthly credits "reset monthly and don't roll over" [7], which makes it a poor fit for a one-time clean of a large list. As a pure verifier it costs more per 10,000 than the dedicated tools above.
Best fit: SDR teams that find and email prospects in Hunter and want verification built into the same workflow. For a wider look at sending tools, see our comparison of lemlist alternatives for cold email.
How to choose an email verification tool
Price per 1,000 and per 10,000. For a one-off clean of 10,000 addresses, Bouncer and Emailable both come to $60 [1] [2], Kickbox to $70 [5]. ZeroBounce's ONE plan is $99 a month with a 10,000-credit minimum [3], and NeverBounce Growth is $49 a month for up to 10,000 [6].
Pay-as-you-go vs monthly. For a few cleans a year, buy credits that never expire, as at Bouncer and Emailable [1] [2]. Monthly plans suit daily inflows from forms or a CRM.
Free credits. Emailable gives 250 to start [2], Bouncer and Kickbox 100 [1] [10], and ZeroBounce 100 per month on a business domain [3]. Test them on a sample of your real list.
Catch-all handling. Catch-all domains accept every address, so a simple check cannot confirm a mailbox exists. ZeroBounce scores these 1–10 [4], Bouncer advertises deep catch-all verification [8], and Hunter verifies accept-all addresses with some major providers [12]. Kickbox and Emailable flag them so you can decide [10] [9].
API and integrations. If you want verification on signup forms or inside your sales stack, check the email verification API and the integration list first. If your workflow is unusual, a custom connector between your CRM and a verification API is often a small build; that is the kind of work our GTM engineering team does, and it pairs well with a custom CRM. If you are also choosing a sending platform, our guide to email marketing automation platforms covers that side.
FAQ
What is the best email validation service for a one-time list clean?
Look for credits that do not expire and free unknown results. Bouncer charges $60 for 10,000 credits that never expire and does not bill duplicates or unknown results [1]. Emailable also charges $60 for 10,000 credits and refunds duplicates and unknowns [2].
Is there a free bulk email verifier?
Most tools give free credits rather than a free bulk plan. Emailable starts new accounts with 250 credits [2], Kickbox makes the first 100 verifications free [10], and ZeroBounce offers 100 free monthly verifications with a business domain [3]. Hunter's free plan includes 50 credits per month, at 0.5 credit per verification [7].
Which email verification API is easiest to add to a signup form?
Emailable offers client libraries in Node.js, Ruby and Python [9], NeverBounce has wrappers for eight languages including Python, Go and .NET [11], and Bouncer offers synchronous and asynchronous endpoints [8]. Pick the email validation API that matches your form builder and CRM.
What are good ZeroBounce alternatives if I only need verification?
If you do not need ZeroBounce's scoring and deliverability bundle, Bouncer and Emailable cost $60 for 10,000 verifications [1] [2], compared with ZeroBounce's $39 entry for 2,000 [3].
How do email verification tools handle catch-all addresses?
They flag them because the server accepts any address. ZeroBounce scores catch-all emails from 1 to 10 [4], while Hunter notes that on accept-all domains "neither Hunter nor most other tools can fully confirm deliverability," though it can verify accept-all addresses with several major email providers [12].
Our recommendation
For most marketers cleaning a list before a campaign, start with Bouncer or Emailable: both list $60 for 10,000 verifications [1] [2]. Bouncer suits batches from 1,000; Emailable suits buyers of 5,000+ who want its integrations. Pick ZeroBounce if catch-all scoring is worth the higher entry price, NeverBounce if you want monthly CRM auto-sync, Kickbox for small top-ups, and Hunter only if your team already finds leads there.
Sources
- Bouncer: Email Verification Pricing — checked 2026-11-08
- Pricing | Emailable — checked 2026-11-08
- Email Validation Pricing | ZeroBounce — checked 2026-11-08
- Email Validation Tools & Email List Cleaning | ZeroBounce — checked 2026-11-08
- Email Verification Pricing | Kickbox — checked 2026-11-08
- Email Verification Pricing | NeverBounce — checked 2026-11-08
- Plans & pricing - Hunter — checked 2026-11-08
- Powerful, secure and Caring Email Verification - Usebouncer — checked 2026-11-08
- Email Verification Service & Software | Emailable — checked 2026-11-08
- Email Address Verification Service | Kickbox — checked 2026-11-08
- Email Verifier & Email List Cleaner | NeverBounce — checked 2026-11-08
- Email Verifier: Free email checker to avoid risky email addresses - Hunter — checked 2026-11-08
