Best email verifier for Apollo: 7 options compared
Quick answer: Ranked by connection first, then price for 10,000 a month, the top three are DeBounce, Clearout and ZeroBounce. Of the 10 other verifiers whose sites we could read, DeBounce, Clearout and ZeroBounce list an integration with Apollo on their own site. SimpleVerifier has no Apollo connector; you upload the export as a CSV; Pro is $39 a month and covers 10,000. Apollo marks its own emails with a status, and many teams re-check exports before a sequence. Prices and integrations checked 27 October 2026.
By SimpleVerifier Team · Last updated · Prices and limits checked on each vendor’s own site
Which email verifier should I use for Apollo exports?
For a native Apollo connection, the top picks here are DeBounce, Clearout and ZeroBounce, by their own sites (checked October 27, 2026). SimpleVerifier has no Apollo connector: it re-checks an Apollo CSV export with a real SMTP mailbox check and keeps catch-all addresses risky. Plans start at $9 a month; Pro is $39. The first 100 checks are free.
- What it is
- Email verification with a real SMTP mailbox check: each address comes back valid, risky or invalid with a reason. Includes an email finder on Pro and up.
- Price per check
- Starter $9/mo for 2,500 ($3.60 per 1,000); Pro $39/mo, 100,000 a month at full speed ($0.39 per 1,000 when used), then slower, never cut off. Business $99/mo with 300,000 at full speed; Agency $249/mo with 750,000 at full speed.
- One-time packs
- 10,000 for $15 ($1.50 per 1,000); 25,000 for $29 ($1.16 per 1,000); 50,000 for $49 ($0.98 per 1,000); 100,000 for $79 ($0.79 per 1,000); 250,000 for $169 ($0.68 per 1,000). Credits never expire, run at standard speed, CSV verification only (no API or finder).
- Free checks
- First 100 email checks free with a Google sign-in, no card, once per account. Single checks on the free email checker need no account.
- Billing
- Monthly subscription, cancel anytime (yearly billing optional). One-time packs are listed above. Starter allowances reset monthly and do not roll over.
- Speed today
- One sending IP today, shared by every customer: about 13,000 mailbox checks a day in the standard lane. Bad syntax, dead domains and disposable addresses return at once; a list of 100,000 takes days, not hours, and each job shows its estimated finish time.
- Catch-all handling
- Catch-all (accept-all) addresses stay risky, never valid, and are graded higher, medium or lower likelihood with the reasons. Anything a mail server does not confirm is risky.
- API and MCP
- REST API on Pro, Business and Agency (Pro includes 10,000 calls a month, then $1.50 per 1,000). Remote MCP server with 6 tools for Claude, ChatGPT, Cursor and VS Code. No API on Starter.
- Integrations
- Connects to Instantly, Smartlead, HubSpot and Mailchimp by API key: verifies a campaign or list and tags each contact with its result. CSV in and out for any other tool.
- Phone
- Free phone format checks (country, type range). Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month). It never says a number is in service.
- What it does not do
- No sending, warmup or inbox placement tests. No published accuracy benchmark against other verifiers. Catch-all domains, Yahoo and AOL cannot be confirmed, and Outlook.com and Hotmail mailboxes are not probed while Microsoft refuses checks from our server's network: all of these come back risky, never valid.
SimpleVerifier facts from our pricing page and product. Last updated .
How do these tools compare?
Ranked first by connection: tools whose own site lists an integration with Apollo, or that are built into Apollo, come before CSV-only and unconfirmed ones (SimpleVerifier's beta connectors count as CSV until they are generally available). Inside each group, by the lowest published price to verify 10,000 addresses a month (a monthly plan where one exists, otherwise a 10,000-credit pack).
| # | Tool | 10,000 a month | Apollo connection | Free limit | Bulk limit | Price | Signup needed | Best for |
|---|---|---|---|---|---|---|---|---|
| 1 | DeBounce | $23 | Yes: import an Apollo list (its integrations page) | 100 free credits | Limited by credits bought | $23/mo for 10,000 (monthly); $25 one-time | Yes (free account) | Small and medium lists cleaned once or monthly |
| 2 | Clearout | $58 | Yes: listed on its integrations page | 100 free credits (no expiry) | Limited by credits bought | $58/mo for 10,000 billed monthly; $32/mo billed yearly | Yes (free account) | Annual buyers who also want an email finder and prospecting |
| 3 | ZeroBounce | $99 | Yes: Apollo integration page on its site | 100 free validations a month | Limited by credits bought | $99/mo for 10,000 (ZeroBounce ONE); pay as you go from $39 for 2,000 | Yes (free account) | Teams that want a deliverability suite in one plan |
| 4 | EmailListVerify | $25 | No Apollo integration found on its site; export a CSV | 100 free credits on signup | Limited by credits bought | $25/mo for 10,000; $27 one-time | Yes (free account) | Steady lists of 5,000-10,000 a month |
| 5 | SimpleVerifier | $39 | No connector: export from Apollo and upload the CSV | 100 free email checks, one time, with Google sign-in and no card | CSV up to 100,000 rows; Pro runs 100,000 a month at full speed, then slower, never cut off | $39/mo Pro (covers 10,000 and up to 100,000 at full speed); $9/mo for 2,500 (Starter) | Yes (Google sign-in) | Lists checked every month, re-checks, and campaign tools it connects to |
| 6 | MillionVerifier | $39 | No Apollo integration found on its site; export a CSV | 100 free credits | Limited by credits bought | $39 for 10,000 credits (one-time) | Yes (free account) | Very large one-off cleans |
| 7 | NeverBounce | $49 | No Apollo integration found on its site; export a CSV | Free credits to test a first list (amount not stated) | Up to 10,000 a month on Growth; more priced on request | $49/mo for up to 10,000 (Growth); $8 per 1,000 pay as you go | Yes (free account) | Teams that want verification synced into many marketing tools |
Which one should you pick?
Pick DeBounce if you want a low price on a one-off clean of a small or medium list, with pay-as-you-go credits that never expire.
Pick Clearout if you pay yearly and also want an email finder and prospecting on the same credit balance.
Pick ZeroBounce if you will use what its subscription bundles (inbox placement tests, blacklist monitoring, warmup), or want a free allowance that refills every month.
Pick EmailListVerify if you verify a steady 5,000 to 10,000 addresses a month ($16 a month for 5,000), or want pay-as-you-go credits that never expire.
Pick SimpleVerifier if you verify or re-check lists every month and want one flat monthly price instead of credits, with catch-all addresses kept risky rather than marked valid.
Skip SimpleVerifier if you want the lowest price for one small list, where another vendor's pack can cost less (cost by list size); you need your data processed only inside the EU (our service providers process data in several countries, including the US); or your list is mostly Outlook.com, Hotmail or Live addresses, which Microsoft currently won't let us confirm, so they come back risky (why).
Pick MillionVerifier if you clean a very large list once in a while: 1,000,000 credits are $449 one-time, never expire, and there is no subscription to cancel.
Pick NeverBounce if you want verification synced inside many marketing tools: its pricing page lists 80+ integrations.
How we compared
On 27 October 2026 we read each vendor's integrations page or help center for Apollo (prices were read the same day), and list those pages under each tool. "None found" means we did not find one that day, not that it is impossible: most tools also have an API or Zapier. We checked 10 verifiers; to keep the table short it shows the ones that list a Apollo connection and the lowest-priced CSV options, and leaves out Emailable, Bouncer, Kickbox and Hunter, which are in the main roundup. We did not run an accuracy benchmark, so nothing here ranks accuracy: test a shortlist on a sample of your own list, including addresses you know are dead.
Each tool in a few lines
1. DeBounce
Best for: Small and medium lists cleaned once or monthly
- Pay-as-you-go credits never expire
- 100,000 credits are $135 one-time
- Watch out: Every pass over the same list is billed again
Checked October 27, 2026: DeBounce pricing · DeBounce integrations
2. Clearout
Best for: Annual buyers who also want an email finder and prospecting
- Unused plan credits roll over, by its pricing page
- Verification, finder and prospecting share one balance
- Watch out: The monthly-billed price for 10,000 is well above the yearly rate
Checked October 27, 2026: Clearout pricing · Clearout integrations
3. ZeroBounce
Best for: Teams that want a deliverability suite in one plan
- The free allowance refills every month
- ONE bundles warmup, inbox tests and blacklist monitoring
- Watch out: Pay as you go starts at $39 for 2,000 credits
Checked October 27, 2026: ZeroBounce pricing
4. EmailListVerify
Best for: Steady lists of 5,000-10,000 a month
- A 5,000-a-month plan is $16
- Pay-as-you-go credits never expire
- Watch out: The page shows euros in some regions while its structured data lists US dollars
Checked October 27, 2026: EmailListVerify pricing · EmailListVerify integrations
5. SimpleVerifier(our tool)
Best for: Lists checked every month, re-checks, and campaign tools it connects to
- Connects to Instantly, Smartlead, HubSpot and Mailchimp by API key and tags each contact valid, risky or invalid
- Catch-all addresses stay risky, never valid
- Watch out: One-time packs run at standard speed and cover CSV verification only (no API or finder)
- Watch out: Starter's allowance resets monthly and does not roll over, and has no API; 10,000 a month needs Pro
Checked October 27, 2026: SimpleVerifier pricing · SimpleVerifier integrations
6. MillionVerifier
Best for: Very large one-off cleans
- 1,000,000 credits are $449 and never expire
- No subscription to cancel
- Watch out: No monthly plan, so a monthly re-check is a new purchase each time
Checked October 27, 2026: MillionVerifier pricing (all packages) · MillionVerifier help: integrations
7. NeverBounce
Best for: Teams that want verification synced into many marketing tools
- Its pricing page says it works with Zapier, n8n, HubSpot, Mailchimp and 80+ integrations
- Watch out: Pay-as-you-go credits expire 12 months after purchase
Checked October 27, 2026: NeverBounce pricing
Common questions
- Why verify Apollo emails if Apollo already says they are verified?
- A status shown in a database reflects when that record was last checked. Re-checking an export just before it goes into a sequencer catches mailboxes that have closed since; see why Apollo-verified emails still bounce.
- Which verifiers connect to Apollo directly?
- On 27 October 2026, ZeroBounce, DeBounce and Clearout listed an Apollo integration on their own sites. SimpleVerifier has no Apollo connector: export the CSV and upload it, or use the free Apollo email verifier for a quick sample.
- What does it cost to verify 10,000 Apollo leads?
- By published monthly prices: DeBounce $23, EmailListVerify $25, SimpleVerifier Pro $39, ZeroBounce ONE $99. One-time packs: DeBounce $25, MillionVerifier $39.
- Is the cheapest verifier the most accurate?
- We did not run an accuracy benchmark, so nothing here ranks accuracy: test a shortlist on a sample of your own list, including addresses you know are dead.
Test it on a real address first
Type any address. It gets the same check the paid plans run: syntax, the domain’s mail servers and, where the provider allows it, a live mailbox check. Nothing is sent to the address.
Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
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