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The Kickbox Insider’s Guide

Everything we know about Kickbox in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.

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ToolGPAOctober 2026

Kickbox

The Insider’s Guide

Pay-as-you-go email verification with an optional threat score

Every plan, grade, refund rule and rival among email verification and deliverability tools, read from Kickbox’s own pages.

Made by J2 Martech Corp · checked Oct 18, 2026 · toolgpa.com

2.4GPA

Contents

  1. 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
  2. 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
  3. 03What it doesIts main features, where it runs, what it works with and who makes it
  4. 04Where it standsIts grades against its category, and whether to keep it or make your own
  5. 05The alternativesThe tools it is most often weighed against, side by side
  6. 06Quick answersThe questions people ask about it, each answered in a line or two
  7. 07About ToolGPAWho made this guide, what else is on the site, and how to cite it

ToolGPA put this guide together from Kickbox’s own pages, its app-store listings and our grades. Every fact in it is on Kickbox’s page too, where it is kept up to date. Checked Oct 18, 2026.

Part 01 · Overview

Welcome

What it is, who it suits, its grades and the ten things to know first

2.4

GPA, above 6 of the 15 other email verification and deliverability tools we grade

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.

To get you started, here are 9 things to know about Kickbox, taken from its own pages and our grades.

No App Store rating on record, but nothing to set up: upload a list and it comes back sorted by deliverability.
From our grade for ease of use
  1. 1

    Best for checking sign-ups as they happen

    It only verifies: no warm-up or DMARC, though its team sells deliverability consulting.

  2. 2

    What it costs

    Paid plans start at $5 one-time for 500 verifications.

  3. 3

    You can try it first

    The first 100 verifications are free

  4. 4

    It runs on Web

    Web.

  5. 5

    List verification

    Upload a list and Kickbox sorts each address by deliverability; the vendor says 100,000 addresses take about an hour.

  6. 6

    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.

  7. 7

    Threat Score

    Flags addresses linked to abuse, complaints or a poor sending reputation, for one extra credit only when a threat signal is found.

  8. 8

    A 2.4 GPA, above 6 of 15

    That is against the other email verification and deliverability tools we grade, on value, the free plan, features, ease of use and platforms.

  9. 9

    Keep it

    Nothing Kickbox does is plain enough to make in a weekend. The 2 things listed below take a company.

Kickbox at a glance

Pricing
Free trial, from $5 one-time for 500 verifications
Free plan
No
Free trial
The first 100 verifications are free
Runs on
Web
Made by
J2 Martech Corp
Category
Email Verification & Deliverability
Our grade
2.4 GPA, fair

The report card

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.

ToolGPA report cardKickboxGraded Oct 18, 2026
SubjectGradeComment
Value for moneyC$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.
Free plan and trialCNo free plan, but the first 100 checks are free. Enough to see what the results look like, not to clean a real list.
FeaturesCIt 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.
Ease of useBNo 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.
Platforms and integrationsBWeb and an API, with Mailchimp, Klaviyo, HubSpot, Braze, Iterable, SendGrid and Salesforce, and more through Zapier. No phone or desktop app.
Grade point averageFair, out of 4.02.4

An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.

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 it 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

Good to know

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.

Part 02 · Pricing

What it costs

Every plan, the free plan, ways to pay less and how prices have moved

$5 one-time

To start

Kickbox is a paid product with a free trial, starting at $5 one-time for 500 verifications.

Unknown results are refunded, and Threat Score costs one more credit only when it finds something.
From our grade for value for money

  • Pay as you go

    $5

    one-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.

Trying it first

The first 100 verifications are free

Read from kickbox.com on Oct 18, 2026.

Ways to pay less

  • Nonprofit

    15% off for nonprofits

    Kickbox gives nonprofit organizations a 15% discount on verification.

    Stated on kickbox.com

Part 03 · Features

What it does

Its main features, where it runs, what it works with and who makes it

1

Place it runs: Web

Pay-as-you-go email verification with an optional threat score. Here is what it does, as its own site describes it, and what it covers: public API, email verification.

That's a smaller job, though: no warm-up, placement tests or DMARC tools.
From our grade for 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.

Where it runs

  • Web

What it works with

  • Mailchimp
  • Klaviyo
  • HubSpot
  • Braze
  • Iterable
  • SendGrid
  • Salesforce
  • Zapier

Kickbox is made by J2 Martech Corp.

Part 04 · Standing

Where it stands

Its grades against its category, and whether to keep it or make your own

6/15

Other email verification and deliverability tools it is graded above

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
  • CFree plan and trialAbove 2 of 15
  • CFeaturesAbove 0 of 15
  • BEase of useAbove 8 of 15
  • BPlatforms and integrationsAbove 3 of 15

Keep it, or make your own?

Whether this is something you could build for yourself with an AI app builder, and what you would give up.

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.

Part 05 · Alternatives

The alternatives

The tools it is most often weighed against, side by side

NeverBounce, ZeroBounce, Bouncer, Emailable and DeBounce

The 5 tools Kickbox is most often weighed against, with where each one differs from it.

Part 06 · Questions

Quick answers

The questions people ask about it, each answered in a line or two

13

Questions, each answered in a line or two

The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.

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.

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.

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.

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.

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.

Where this guide comes from

The prices, plans, platforms and features were read from Kickbox’s own pages on Oct 18, 2026, and the grades were given on Oct 18, 2026. 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.

Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by J2 Martech Corp. Prices change, so check kickbox.com before you buy.

Part 07 · About

About ToolGPA

Who made this guide, what else is on the site, and how to cite it

2,281

Tools graded, in 73 categories

ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.

ToolGPA is free to read. It may earn a commission from affiliate links and it works with sponsors, but anything paid for is labelled and no one can pay for a grade. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.

  • 2,281

    tools graded

  • 73

    categories

  • 426

    price changes on record

  • 579

    apps priced in 12 countries

What else is on toolgpa.com

Scan for the live page

Prices and grades as they are today

Quoting this guide?

Please name ToolGPA and link to the live page, so readers can check the figures for themselves:

ToolGPA, "Kickbox: The Insider's Guide", checked Oct 18, 2026. https://toolgpa.com/tools/kickbox

Know someone choosing between email verification and deliverability tools?

Send them this guide: toolgpa.com/tools/kickbox/guide

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See our other guides

The best-graded email verification and deliverability tools after Kickbox, each with an Insider's Guide of its own.

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Everything in this guide is ToolGPA’s own summary of what Kickbox’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. ToolGPA uses affiliate links and may earn a commission from them, and it works with sponsors; anything paid for is labelled, and no one can pay for a grade. Kickbox is a trademark of its owner, and this guide is not made, paid for or approved by J2 Martech Corp. Prices and plans change: check kickbox.com before you buy.