Email Verification & Deliverability

Contents

1. 01WelcomeWhat these tools do, how many we grade and what to know before choosing
2. 02Our top threeThe three we'd look at first, and who each one suits
3. 03What they costWhat paid plans start at, the best buy at each budget and the free plans
4. 04The gradesThe highest graded, and how the whole category does on each subject
5. 05Keep or make?Which are worth paying for, and which you could make yourself
6. 06Every toolAll of them, best graded first, with what each costs
7. 07Quick answersThe questions people ask when choosing, each answered in a line or two
8. 08About ToolGPAWho made this guide, what else is on the site, and how to cite it

ToolGPA put this guide together from each tool’s own pages, their app-store listings and our grades. Every fact in it is on the Email Verification & Deliverability page too, where it is kept up to date. Checked Oct 18, 2026.

Clean your list, warm up a new inbox and set up DMARC so your emails reach the inbox.

Before you choose, here are 7 things to know about email verification and deliverability tools, worked out from every one we grade.

1. 1

   We grade 16 email verification and deliverability tools

   3 of them are free or have a free plan, and 11 more let you try before paying. Everything in this guide comes from their own pages and our grades.

2. 2

   Paid plans start at $28 a month in the middle

   From $15 (Warmup Inbox) to $149 (InboxAlly), going by what each one's paid plans start at.

3. 3

   Best value: Clearout and Warmup Inbox

   Nothing on our chart scores higher than these without costing more.

4. 4

   0 of 16 have iPhone and Android apps

   16 run in a web browser and 0 have a Windows app. Check the one you need before you fall for anything.

5. 5

   The middle GPA is 2.4

   0 score 3.0 or higher. The highest is DeBounce, at 2.6.

6. 6

   Best free option: ZeroBounce

   ZeroBounce has the highest GPA of the free ones, 2.4. Email list verification with warm-up and DMARC monitoring in one plan.

7. 7

   16 worth keeping, 0 you could make

   By our keep-or-make rules, 16 do something you couldn't reasonably build yourself, 0 are simple enough to make with an AI app builder, and 0 are a close call.

Part 02 · Top three

Our top three

The three we'd look at first, and who each one suits

The three email verification and deliverability tools we'd look at first. First place suits the most people; second and third are the best picks for the people it leaves out. Each has an Insider's Guide of its own.

1. 1st

   

   2.6GPA

   DeBounce

   Free trial · from $15 one-time

   For: Most small senders cleaning a list

   DeBounce removes addresses that would bounce before you send: upload a file or import a list from Mailchimp, HubSpot, Klaviyo or ActiveCampaign, with duplicates removed free, or check sign-ups as they happen through the API, a JavaScript widget or a WordPress plugin. Credits never expire and come in packs of $15 for 5,000, $25 for 10,000 or $135 for 100,000, after 100 free credits with no card. Know the limits: catch-all checks cost 10 credits an address, monthly list rechecks cost twice the list size in credits, and it does not warm up inboxes, test placement or manage DMARC.

   The DeBounce Insider’s Guide

2. 2nd

   

   2.4GPA

   Warmup Inbox

   Free trial · from $15/mo

   For: Cold emailers warming new inboxes

   Warmup Inbox builds a new mailbox's reputation by trading emails with more than 30,000 real inboxes, which reply to up to 25% of them on Basic, and shows whether warm-up mail lands in spam or a tab. It works with Gmail, Outlook, Microsoft 365 and Zoho Mail. Basic is $15 an inbox a month billed yearly ($19 monthly) for 75 warm-up messages a day, after a 7-day trial with no card. It is second because it serves cold emailers more than every sender: the cost grows with each inbox, language and SendGrid or Amazon SES warm-up need Pro at $49, and it does not clean lists or manage DMARC.

   The Warmup Inbox Insider’s Guide

3. 3rd

   

   2.2GPA

   GlockApps

   Free plan · from $59/mo

   For: Senders testing placement and reading DMARC reports

   GlockApps shows where an email lands before it goes out: send it to its seed addresses and it reports inbox, spam or tab at Gmail, Yahoo, Outlook and others, with SpamAssassin scores, authentication checks and 50+ blocklists. Its DMARC Analyzer reads reports for unlimited domains, and the free plan covers 10,000 DMARC messages a month and 2 spam tests, with no card. It is third because it tests and monitors rather than fixes: it does not clean lists or warm up inboxes, extra tests are $16.99 for 3, and Essential is $59 a month billed yearly but $85 monthly.

   The GlockApps Insider’s Guide

Going by our grades, Clearout and Warmup Inbox give the most for the money among email verification and deliverability tools: no tool on this chart scores higher without costing more.

Paid plans start at a middle price of $28 a month across the 8 that charge, from $15 (Warmup Inbox) to $149 (InboxAlly).

3 of the 8 score above the category's average while starting at or below its middle price. 2 cost more than the middle price and score below the average.

Every tool gets five grades, A to F, each with its reason, and a GPA that averages them. Here are the 12 highest graded email verification and deliverability tools, then how the whole category does on each subject.

Tool	Value	Free	Features	Ease	Platforms	GPA
DeBounce	B	C	C	B	B	2.6
Bouncer	C	C	C	B	B	2.4
Clearout	C	C	C	B	B	2.4
Emailable	C	C	C	B	B	2.4
Kickbox	C	C	C	B	B	2.4
MillionVerifier	C	C	C	B	B	2.4
NeverBounce	C	C	C	B	B	2.4
Warmup Inbox	B	C	C	C	B	2.4
Warmy	C	C	B	C	B	2.4
ZeroBounce	D	C	B	B	B	2.4
dmarcian	B	C	C	C	C	2.2
GlockApps	C	B	C	C	C	2.2

Some software does something you couldn’t reasonably build yourself. Some is simple enough that an AI app builder could make the core of it in an afternoon. Here’s where email verification and deliverability tools land, by the same rules for every tool.

• 16

  Keep it

  It does something you could not reasonably make for yourself, or it costs nothing.

• 0

  Your call

  You could make the core of it, and you would give something up.

• 0

  You could make this

  What it does is the kind of thing an AI app builder makes well, and it charges every month.

Every email verification and deliverability tool we grade, with its GPA and what it costs. Each one has a page of its own on toolgpa.com, with its Insider’s Guide.

1. 1DeBounceFree trial · from $15 one-time2.6
2. 2BouncerFree trial · from $8 one-time2.4
3. 3ClearoutFree trial · from $16/mo2.4
4. 4EmailableFree trial · from $38 one-time2.4
5. 5KickboxFree trial · from $5 one-time2.4
6. 6MillionVerifierFree trial · from $39 one-time2.4
7. 7NeverBounceFree trial · from $8 one-time2.4
8. 8Warmup InboxFree trial · from $15/mo2.4
9. 9WarmyFree trial · from $49/mo2.4
10. 10ZeroBounceFree plan · from $39 one-time2.4
11. 11dmarcianFree plan · from $19.99/mo2.2
12. 12GlockAppsFree plan · from $59/mo2.2
13. 13EasyDMARCFree trial · from $35.99/mo2.0
14. 14InboxAllyFree trial · from $149/mo2.0
15. 15MailReachFrom $20/mo1.8
16. 16PowerDMARCPaid1.8

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