Kickbox
Pay-as-you-go email verification with an optional threat score
Kickbox report card
Fair · out of 4.0 · graded Oct 18, 2026
Best for checking sign-ups as they happen
Kickbox sells checks in packs from $5, with no subscription, and its API is built for checking sign-ups as they happen, with a sandbox for testing. 10,000 checks cost $70, near the dear end of the list cleaners. It only verifies: no warm-up or DMARC, though its team sells deliverability consulting.
Who Kickbox is for
- Great if you check sign-ups in real time and want a sandbox to test against
- Handy when you're on Braze, Iterable or Klaviyo and want checks built in
- Good for nonprofits, who get 15% off
Who Kickbox is not for
- Pricey if you clean big lists, as a million checks cost $2,999
- Not for you if you need warm-up or DMARC tools as well
Why Kickbox gets a 2.4
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- CValue for money$70 for a one-off pack of 10,000. Among its listed rivals only ZeroBounce (about $129) costs more; NeverBounce is $50, Bouncer and Emailable $60 and DeBounce $25. Unknown results are refunded, and Threat Score costs one more credit only when it finds something.
- CFree plan and trialNo free plan, but the first 100 checks are free. Enough to see what the results look like, not to clean a real list.
- CFeaturesIt does the checking job fully: bulk lists, a real-time API with a sandbox, a free check for disposable domains and an optional Threat Score. That's a smaller job, though: no warm-up, placement tests or DMARC tools.
- BEase of useNo App Store rating on record, but nothing to set up: upload a list and it comes back sorted by deliverability. Kickbox says 100,000 addresses take about an hour.
- BPlatforms and integrationsWeb and an API, with Mailchimp, Klaviyo, HubSpot, Braze, Iterable, SendGrid and Salesforce, and more through Zapier. No phone or desktop app.
What these grades rest on. Graded from this listing, whose facts were read from Kickbox's own pages on 18 October 2026. Not based on using the product, and shorter than our full reviews. How we review and grade.
Make Kickbox? Put this grade on your site
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<a href="https://toolgpa.com/tools/kickbox#review"><img src="https://toolgpa.com/badge/kickbox.svg" alt="Kickbox: 2.4 GPA on ToolGPA" width="196" height="56"></a>Where Kickbox stands among email verification and deliverability tools
Kickbox's GPA of 2.4 is higher than 6 of the 15 other email verification and deliverability tools we grade, and level with 8.
It stands best on ease of use (B, above 8 of 15) and worst on features (C, above 0).
Each grade against the category
Every bar is all 16 email verification and deliverability tools we grade, cut by the letter each got. Kickbox’s own letter is outlined.
- CValue for moneyAbove 2 of 15, level with 10
- CFree plan and trialAbove 2 of 15, level with 12
- CFeaturesAbove 0 of 15, level with 13
- BEase of useAbove 8 of 15, level with 7
- BPlatforms and integrationsAbove 3 of 15, level with 12
Keep Kickbox, or make your own?
Keep it
Nothing Kickbox does is plain enough to make in a weekend. The 2 things listed below take a company.
It costs $5, paid once.
What you could not
- Checking that an address exists without writing to it.
- It plugs into other products, Mailchimp, Klaviyo and HubSpot among them, and has an API.
What this rests on. Kickbox’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
What is Kickbox?
Kickbox cleans email lists and checks sign-ups as they happen, through file uploads, an API or connections to email platforms such as Mailchimp, Klaviyo and HubSpot. An optional Threat Score flags addresses tied to abuse or complaints. It does not warm up inboxes or manage DMARC, though it sells deliverability consulting. Verifications are bought in packs, from $5 for 500.
Kickbox is a paid product with a free trial, starting at $5 one-time for 500 verifications. See every plan
Good for
- Marketers who verify a list now and then without a subscription
- Developers adding real-time checks to a sign-up form
- Teams on Braze, Iterable or Klaviyo that want verification built in
Worth knowing
- Only pay-as-you-go packs are listed; there is no monthly plan on the pricing page.
- Kickbox verifies addresses only; it has no warm-up, inbox placement testing or DMARC tools.
- Threat Score can double the cost per address when it finds a signal.
Key features
- List verification
- Upload a list and Kickbox sorts each address by deliverability; the vendor says 100,000 addresses take about an hour.
- Verification API
- Checks addresses at sign-up in real time, with a sandbox mode for testing without spending credits and a free endpoint for spotting disposable domains.
- Threat Score
- Flags addresses linked to abuse, complaints or a poor sending reputation, for one extra credit only when a threat signal is found.
- Native integrations
- Verifies lists inside Mailchimp, Klaviyo, HubSpot, Braze, Iterable, SendGrid and others, with more through Zapier.
- Deliverability consulting
- Deliverability audits and consulting from Kickbox's own team are offered as a separate service beside verification.
Kickbox pricing
- Starts at
- $5 one-time for 500 verifications
- Free plan
- None
- Free trial
- The first 100 verifications are free
| Plan | Price | What you get |
|---|---|---|
| Pay as you go | $5one-time for 500 verifications | Larger packs cost less per check: $10 for 1,000, $70 for 10,000, $500 for 100,000 and $2,999 for 1 million. Unknown results are refunded. |
| Custom | Custom | Volume pricing for more than 1 million verifications, through sales. |
Read from kickbox.com on Oct 18, 2026. Prices change, so confirm with Kickbox before you buy.
Ways to pay less
- Nonprofit15% off for nonprofits
Kickbox gives nonprofit organizations a 15% discount on verification.
Stated on kickbox.com
Works with
Kickbox alternatives
- Kickbox vs NeverBounce
Free trial · from $8 one-time
- Kickbox vs ZeroBounce
Free plan · from $39 one-time
- Kickbox vs Bouncer
Free trial · from $8 one-time
- Kickbox vs Emailable
Free trial · from $38 one-time
- Kickbox vs DeBounce
Free trial · from $15 one-time
Common questions
Is Kickbox free?
No, Kickbox is a paid product, but you can try it first. The first 100 verifications are free.
How much does Kickbox cost?
Kickbox lists 2 plans. Pay as you go: $5 one-time for 500 verifications. Custom: custom pricing. Prices were read from kickbox.com on Oct 18, 2026.
What platforms does Kickbox work on?
Kickbox is available on Web.
Does Kickbox offer any discounts?
Kickbox publicly lists the following: 15% off for nonprofits.
Does Kickbox have an Android app?
No Android app was listed when its pages were read on Oct 18, 2026. Kickbox is listed for Web.
Does Kickbox have an iPhone app?
No iPhone app was listed when its pages were read on Oct 18, 2026. Kickbox is listed for Web.
Is Kickbox open source?
Kickbox is not described as open source on its own site, as read on Oct 18, 2026.
Does Kickbox have an API?
Yes. Kickbox offers a public API, according to its own site.
What does Kickbox integrate with?
Kickbox's listing names Mailchimp, Klaviyo, HubSpot, Braze, Iterable, SendGrid, Salesforce and Zapier. A listing names up to eight integrations, so it may connect to more.
Who makes Kickbox?
Kickbox is made by J2 Martech Corp.
What are the alternatives to Kickbox?
The closest alternatives to Kickbox in our directory are NeverBounce, ZeroBounce, Bouncer, Emailable and DeBounce. Each one has a side-by-side comparison with Kickbox.
How does Kickbox compare with other email verification and deliverability tools?
Kickbox's GPA of 2.4 is higher than 6 of the 15 other email verification and deliverability tools we grade, and level with 8. It stands best on ease of use (B, above 8 of 15) and worst on features (C, above 0).
Could I make my own version of Kickbox?
Nothing Kickbox does is plain enough to make in a weekend. The 2 things listed below take a company. It costs $5, paid once. What you could not make: Checking that an address exists without writing to it. It plugs into other products, Mailchimp, Klaviyo and HubSpot among them, and has an API. This is a judgement from its listing. We have not built one.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Oct 18, 2026.