Is InboxSure cheaper than Clearout?

For regular list cleaning it usually is, because InboxSure Pro is a flat $49 a month with no per-email charge, while every Clearout verification uses a credit. Clearout's per-credit rate depends on volume; check its pricing calculator for your amount.

Do Clearout credits expire?

Clearout's pricing guide says purchased credits never expire and unused subscription credits roll over, though discounted credits may have an expiry date. InboxSure does not use credits.

How do they handle catch-all emails?

Clearout reports them as Catch-All and offers a separately priced Deep Verify mode to resolve some of them. InboxSure detects catch-all domains and marks those contacts Risky with a catch-all flag.

Does InboxSure have an email finder like Clearout?

No. InboxSure only verifies addresses you already have. You can find leads in another tool and verify the export in InboxSure.

Does InboxSure have an API like Clearout?

An API is coming soon on the Pro plan. Today InboxSure works by uploading a CSV or Excel file and downloading the results.

Clearout alternative

InboxSure vs Clearout

Clearout is a credit-based suite with verification, an email finder, form protection and phone checks. InboxSure is a focused verifier with a flat price.

Clearout details checked against their public pages on October 28, 2026. Sources

Clearout bundles several products on one credit balance: email verification, an email finder, Form Guard for signup forms, phone number validation, a Google Sheets add-on and a Chrome extension. It also sells a separately priced Deep Verify mode that tries to resolve catch-all addresses.

InboxSure does one thing: list verification with syntax, DNS/MX and SMTP mailbox checks, plus catch-all, disposable and role-based detection. Pro is a flat $49 a month for unlimited lists of up to 10,000 addresses.

If you only need clean lists, the flat price is simpler. If you want the extra tools, Clearout covers more ground.

At a glance

	InboxSure	Clearout
Pricing model	Flat monthly plan, no credits	Credits by volume, monthly or top-up
Cost per verification	No per-email charge on Pro	1 credit per valid, invalid or catch-all result
Free plan	Unlimited lists of up to 50 addresses	100 free credits at signup
Credit expiry	No credits	Purchased credits never expire; subscription credits roll over
Unknown results	No credits to lose	Not charged
Catch-all handling	Detected and flagged as Risky	Reported as Catch-All; Deep Verify priced separately
Other products	Free SPF, DMARC and MX tools	Email finder, Form Guard, phone validation, Sheets, Chrome extension
API	Coming soon on Pro	REST API and webhooks
Certifications	GDPR-compliant processing	GDPR, ISO 27001, SOC 2 Type II

What it costs in practice

Clearout prices credits by volume and shows the rate for your amount in a calculator on its pricing page; 1 credit covers one valid, invalid or catch-all result, and unknown results are free. Check their calculator for your volume.

On InboxSure Pro there is no calculator to run: verifying 10,000 or 30,000 addresses in a month costs the same $49.

See the full plan details on the InboxSure pricing page.

Where InboxSure is better

Cost does not grow with your list. Every Clearout verification uses a credit, so bigger lists cost more. On InboxSure Pro, a month of 10,000-address lists is $49 however many you run.
No credit planning. No choosing between monthly credits and top-ups, and no credits shared with other tools.
Free plan that keeps working. Clearout gives 100 credits at signup. InboxSure's free plan verifies lists of up to 50 addresses as often as you like.
Simple to cancel. Clearout's pricing guide says subscriptions are non-refundable. InboxSure Pro is monthly with no contract, and you keep access to the end of the billing period.

Where Clearout is better

More tools in one account. If you also want an email finder, signup-form protection or phone validation, Clearout has them and InboxSure does not.
Deeper catch-all checks. Clearout's Deep Verify tries to resolve catch-all addresses to valid or invalid, at an extra cost. InboxSure flags them as Risky.
API and certifications. Clearout has a REST API, webhooks and states ISO 27001 and SOC 2 Type II certification. InboxSure's API for Pro is coming soon.
Very large lists. InboxSure Pro handles up to 10,000 addresses per list, one list at a time.

Which should you choose?

Choose Clearout if you want verification plus an email finder, form protection or phone checks in one account, or you need SOC 2 today.

Choose InboxSure if you mainly clean email lists and want one flat monthly price that does not grow with volume.

Either way, you can see how InboxSure handles your own data for free: lists of up to 50 addresses cost nothing, and results come back as Deliverable, Risky, Undeliverable or Unknown with the reason. InboxSure reports Unknown when a mail server will not give a clear answer, rather than guessing.