- You want to pay only for answers: Unspam never charges for an unknown, a duplicate or a malformed address. NeverBounce bills every unique, syntactically valid address and publishes no exemption for unknown or accept-all results.
- You want credits that do not run out on a clock: NeverBounce's pay-as-you-go credits expire 12 months after purchase.
- You want the email tested as well as the list: spam score, inbox placement across 7 providers, previews in 50+ clients and an AI assistant sit beside the verifier. NeverBounce sells verification only.
- You work from an AI assistant: Unspam has an official MCP server with five verification tools. NeverBounce is reachable from assistants only through third-party connectors such as Zapier.
A NeverBounce alternative where unknown results cost nothing
NeverBounce, part of ZoomInfo, is an email verifier with a real-time API, a signup form widget, 80+ integrations and scheduled re-verification, sold at $8 per 1,000 credits or on Growth plans from $49/mo. Unspam verifies single addresses and whole lists, charges nothing for unknowns or duplicates, and puts spam testing, inbox placement and client previews in the same plan, from $5/mo with 10 free checks a day.
Compared from public pricing and product pages, October 2026.
Which one fits you?
- You need a real-time check on a signup form. NeverBounce's single-check API takes a timeout for point-of-entry use, ships a JavaScript form widget and has SDKs in seven languages; Unspam's API answers asynchronously.
- You clean lists inside your ESP or CRM. NeverBounce lists 80+ integrations, including HubSpot, Salesforce, Mailchimp, Marketo and ActiveCampaign, and its Growth plans re-verify connected lists daily, weekly or monthly; Unspam works from uploaded files, its API and its MCP server.
- You want a bounce guarantee. NeverBounce refunds the difference if more than 3% of its valid results bounce, under published conditions.
- Your lists are very large. NeverBounce handles lists of a million rows and more in chunks; Unspam takes up to 100,000 rows or 20 MB per upload.
Why teams move from NeverBounce to Unspam.
Unknown results are free
A server that will not answer gives every verifier an unknown. NeverBounce bills each unique, syntactically valid address and publishes no exemption for those. Unspam charges one credit only for a definitive answer, so an unknown, a duplicate or a malformed address never costs anything.
Test the email, not just the list
NeverBounce tells you which addresses are safe to mail, not whether the message will reach the inbox. Unspam scores the email against the spam filters, shows where it lands at 7 providers and renders it in 50+ clients, on the same plan as the verifier.
Free checks that come back every day
Unspam's verifier checks up to 10 addresses a day for free, with no account and no card, which covers the everyday case of checking a lead before you write to it. Each answer comes with a status, a reason and an action.
Unspam vs NeverBounce, feature by feature.
Based on public product pages and documentation. Spotted something outdated? Tell us in the chat and we'll fix it.
Feature
Unspam
NeverBounce
Free plan or trial
10 checks a day, no signup
Free list analysis and test credits, no card
First paid plan
$5/mo Custom plan minimum, from $6.40 per 1,000 addresses
$8 per 1,000 credits
Single address checks
Yes10 a day free, no signup
Yes
Bulk list cleaning
Yesup to 100,000 rows or 20 MB
YesCSV, over 1M rows in chunks
Real-time check at signup
NoAPI answers asynchronously
Yessingle-check API and form widget
Catch-all domains
Partialdetected and flagged for review, not resolved
Partialdetected as accept-all, not resolved
Unknown results not charged
Yes
Nono published exemption
Duplicates not charged
Yesmalformed addresses too
Yessyntax errors too
Disposable, role and risk flags
Yesdisposable, role, free provider, full inbox
Yesdisposable, role, free host, spam trap network
Typo suggestions
Yes
Yes
ESP and CRM integrations
NoCSV, TXT, API and MCP
Yes80+ listed
Scheduled re-verification
No
YesSync, on Growth plans
API access
YesCustom plan
YesSDKs in seven languages
MCP server
YesCustom plan, five tools
Partialthird-party connectors only
Pre-send email testing
Yesspam score, placement, previews
No
DMARC report monitoring
Yesfirst domain free
No
Compared from public pricing and product pages, October 2026.
What each one costs.
NeverBounce bills unique, syntactically valid addresses, so duplicates and syntax errors are free; it publishes no exemption for unknown or accept-all results. Pay-as-you-go credits expire 12 months after purchase, and purchased credits are not refundable outside the bounce guarantee. Prices come from NeverBounce's own pricing page, help center and terms of use.
- Free $0
Check up to 10 addresses a day on the verifier page, no account and no card. Each answer comes with a status, a reason and an action.
- Custom $5/mo
Upload whole lists (CSV or TXT, up to 100,000 rows or 20 MB), analysed for duplicates, typos and malformed rows before a credit is used. One credit per unique address with a definitive answer, from $6.40 per 1,000 down to $1.20 per 1,000 above 100,000; unknowns, duplicates and malformed addresses are free. REST API, MCP server, and spam tests, inbox placement and previews in the same plan.
- Free $0
Free list analysis and test credits, no credit card needed to verify a first list. Without a card on file the API is rate-limited and bulk jobs are unavailable.
- Pay as you go (entry) $8 per 1,000 credits
$0.008 a credit for 1,000 or 5,000, falling to $0.005 from 10,000, $0.004 at 100,000, $0.003 at 250,000, $0.0025 at 1,000,000 and $0.002 at 2,000,000. Credits expire 12 months after purchase.
- Growth From $49/mo for up to 10,000
A monthly verification volume with Sync, which re-verifies connected lists daily, weekly or monthly and charges only for new, unique addresses. $99/mo for up to 50,000, $159 for 100,000, $249 for 250,000, $499 for 500,000 and $999 for 1,000,000.
Enterprise pricing is custom, typically above 250,000 addresses a month.
Every NeverBounce plan and price in full
Compared from public pricing and product pages, October 2026. NeverBounce is a trademark of its respective owner. Unspam is not affiliated with or endorsed by NeverBounce.
Unspam vs NeverBounce, answered.
Is Unspam a full replacement for NeverBounce?
For list cleaning, mostly: Unspam verifies lists of up to 100,000 rows and single addresses, also through its API and MCP server. NeverBounce is ahead on a real-time signup check with a form widget, 80+ integrations, scheduled re-verification and a bounce guarantee. Unspam adds spam testing, client previews and DMARC monitoring, and never charges for an unknown.
How does Unspam's pricing compare to NeverBounce?
NeverBounce charges $8 per 1,000 credits at small volumes, falling to $0.002 a credit at 2,000,000, with credits that expire after 12 months, or Growth plans from $49/mo. Unspam charges one credit per unique address with a definitive answer on its Custom plan, from $6.40 per 1,000 down to $1.20 per 1,000 above 100,000, with a $5 monthly minimum.
How do the two handle catch-all addresses?
Neither guesses. NeverBounce returns accept-all (unverifiable) and says there is no definitive way to tell whether such an address is valid; Unspam returns catch-all with the action "review". A catch-all domain accepts every address during a check, so a probe alone cannot prove a mailbox exists.
Does NeverBounce test emails before sending?
No. NeverBounce verifies addresses only. Unspam's spam test, inbox placement across 7 providers and previews in 50+ clients come with monthly allowances on the free plan, and DMARC monitoring is on the Custom plan with the first domain free.