The Warmup Inbox Insider’s Guide
Everything we know about Warmup Inbox 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.
Warmup Inbox
The Insider’s Guide
Email warm-up through a network of real inboxes, priced per inbox
Every plan, grade, refund rule and rival among email verification and deliverability tools, read from Warmup Inbox’s own pages.
Made by CyberPanda s. r. o. · checked Oct 18, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Warmup Inbox’s own pages, its app-store listings and our grades. Every fact in it is on Warmup Inbox’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
Warmup Inbox handles warm-up: it sends and replies to emails between your mailbox and a network of more than 30,000 real inboxes, which reply to a share of them, so a new address or domain builds a sending reputation. It also warms dedicated IPs and email platforms such as SendGrid and Amazon SES, and includes simple outreach sequences. It does not clean lists or manage DMARC. Plans are priced per inbox.
To get you started, here are 9 things to know about Warmup Inbox, taken from its own pages and our grades.
You connect each mailbox and leave it running before you send, and the settings you'll want, your own templates and topics, sit on Pro.
- 1
Best for cheap warm-up for new cold email inboxes
Warmup Inbox swaps emails between your mailbox and a network of more than 30,000 real inboxes, so a new address builds a reputation before you send.
- 2
Paid plans start at $15 a month
As its pricing page puts it: $15 per inbox / month, billed annually ($19 monthly).
- 3
You can try it first
7-day free trial of any plan, no credit card required
- 4
It runs on Web
Web.
- 5
Warm-up network
Your mailbox exchanges AI-written emails with more than 30,000 real inboxes, which reply to up to 25% to 50% of them depending on the plan.
- 6
Spam and category monitoring
Dashboards show whether warm-up emails land in spam or in a category tab, plus an email reputation check.
- 7
Language and ESP warm-up
On Pro and Max, warm up in other languages and through sending platforms such as SendGrid and Amazon SES, with custom templates and topics.
- 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
Keep it
To replace Warmup Inbox you would be making a network of real inboxes that open and answer your emails. That is not a weekend's work, with an AI app builder or without one.
Warmup Inbox at a glance
- Pricing
- Free trial, from $15 per inbox / month, billed annually ($19 monthly)
- Free plan
- No
- Free trial
- 7-day free trial of any plan, no credit card required
- Runs on
- Web
- Made by
- CyberPanda s. r. o.
- Category
- Email Verification & Deliverability
- Our grade
- 2.4 GPA, fair
The report card
Best for cheap warm-up for new cold email inboxes
Warmup Inbox swaps emails between your mailbox and a network of more than 30,000 real inboxes, so a new address builds a reputation before you send. At $15 an inbox a month billed yearly, it's the cheapest warm-up here. Language and email-platform warm-up need the $49 Pro plan, and there's no list cleaning or DMARC.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | B | Basic is $15 an inbox a month billed yearly ($19 monthly), and the price per inbox falls as you add more. That's the cheapest among its listed warm-up rivals: MailReach is $20 a mailbox, Warmy starts at $49 and InboxAlly at $149. |
| Free plan and trial | C | No free plan, but a 7-day trial of any plan with no card. Fine for a look around; after that you pay for each inbox. |
| Features | C | It does warm-up fully: more than 30,000 real inboxes replying to 25% to 50% of your emails by plan, spam and tab monitoring, IP warm-up and simple outreach sequences. No list cleaning or DMARC, though, and language and SES or SendGrid warm-up need Pro. |
| Ease of use | C | No App Store rating on record. You connect each mailbox and leave it running before you send, and the settings you'll want, your own templates and topics, sit on Pro. |
| Platforms and integrations | B | Web with an API on every plan, working with Gmail, Google Workspace, Outlook, Microsoft 365, Amazon SES, SendGrid and Zoho Mail. No phone or desktop app. |
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 Warmup Inbox is for
- Great if you're setting up new mailboxes and domains for cold email
- Handy when you need to warm a dedicated IP before raising volume
- Good for agencies warming lots of client inboxes from one dashboard
Who it is not for
- Pricey if you run lots of inboxes, as you pay for every one
- Tight if you write in another language, as language warm-up needs the $49 Pro plan
- Skip it if you also need list cleaning or DMARC
Good to know
Good for
- Cold emailers setting up new mailboxes and domains
- Agencies warming many client inboxes from one dashboard
- Senders on SendGrid or Amazon SES who need to warm a domain or IP
Worth knowing
- Pricing is per inbox, so costs grow with each mailbox; volume discounts start from the second inbox.
- Language warm-up, email-platform warm-up and custom templates need Pro or above.
- It does not verify lists or manage DMARC; DMARC help is limited to a free record generator.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$15
A month to start
Warmup Inbox is a paid product with a free trial, starting at $15 per inbox / month, billed annually ($19 monthly).
Fine for a look around; after that you pay for each inbox.
Basic
$15
per inbox / month, billed annually ($19 monthly)
75 warm-up messages a day, reply rate up to 25%, spam and category monitoring, outreach sequences and the API. The per-inbox price falls as inboxes are added.
Pro
$49
per inbox / month, billed annually ($59 monthly)
250 warm-up messages a day, replies up to 45%, your own templates and topics, language and email-platform warm-up, and scheduling.
Max
$79
per inbox / month, billed annually ($99 monthly)
1,000 warm-up messages a day, replies up to 50%, a technical setup check, premium support and unlimited API use.
51+ inboxes
Custom
Quoted pricing with multi-client workspaces, consolidated billing, specialized reports and dedicated onboarding.
Trying it first
7-day free trial of any plan, no credit card required
Read from warmupinbox.com on Oct 18, 2026.
Ways to pay less
Annual discount
Save 20% with annual billing
Annual plans are billed once for 12 months: Basic is $15 per inbox a month billed annually against $19 billed monthly.
Stated on warmupinbox.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
Email warm-up through a network of real inboxes, priced per inbox. Here is what it does, as its own site describes it, and what it covers: public API, AI features, email campaigns, inbox warm-up.
No list cleaning or DMARC, though, and language and SES or SendGrid warm-up need Pro.
- Warm-up network
- Your mailbox exchanges AI-written emails with more than 30,000 real inboxes, which reply to up to 25% to 50% of them depending on the plan.
- Spam and category monitoring
- Dashboards show whether warm-up emails land in spam or in a category tab, plus an email reputation check.
- Language and ESP warm-up
- On Pro and Max, warm up in other languages and through sending platforms such as SendGrid and Amazon SES, with custom templates and topics.
- IP warm-up
- Warms a dedicated sending IP before volume is raised.
- Outreach sequences
- Basic cold email sequences are included, so a warmed inbox can send campaigns from the same account.
- API and free tools
- A developer API on every plan, plus free placement tests, blacklist checks and DMARC and SPF record generators.
Where it runs
- Web
What it works with
- Gmail
- Google Workspace
- Outlook
- Microsoft 365
- Amazon SES
- SendGrid
- Zoho Mail
Warmup Inbox is made by CyberPanda s. r. o.
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
Warmup Inbox'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 value for money (B, above 13 of 15) and worst on features (C, above 0).
Its paid plans start at $15 a month, against a middle price of $28 for the category: 0 of the 7 others that charge start lower.
On features, ease of use and platforms it scores 2.3 out of 4, and no tool on the category's chart scores higher without costing more.
Each grade against the category
Every bar is all 16 email verification and deliverability tools we grade, cut by the letter each got. Warmup Inbox’s own letter is outlined.
- BValue for moneyAbove 13 of 15
- CFree plan and trialAbove 2 of 15
- CFeaturesAbove 0 of 15
- CEase of useAbove 0 of 15
- BPlatforms and integrationsAbove 3 of 15
Price against what you get
Each dot is one of 8 email verification and deliverability tools. Further left costs less; higher up scores better on features, ease of use and platforms. Warmup Inbox is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
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
To replace Warmup Inbox you would be making a network of real inboxes that open and answer your emails. That is not a weekend's work, with an AI app builder or without one.
It costs $180 a year.
What you could not
- A network of real inboxes that open and answer your emails.
- Newsletters sent to thousands of people that still reach the inbox.
- It plugs into other products, Gmail, Google Workspace and Outlook among them, and has an API.
- AI features, unless you pay a model provider for each request yourself.
What this rests on. Warmup Inbox’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
MailReach, Warmy, InboxAlly and GlockApps
The 4 tools Warmup Inbox is most often weighed against, with where each one differs from it.
- 1.8GPA
MailReach
From $20/mo
Email warm-up and inbox placement tests, priced per mailbox.
- Warmup Inbox also covers email campaigns.
- 2.4GPA
Warmy
Free trial · from $49/mo
Email warm-up with seed testing, verification and DMARC monitoring.
- Only Warmy lists a browser extension.
- Warmup Inbox also covers email campaigns.
- Warmy also covers email verification and dMARC.
- 2.0GPA
InboxAlly
Free trial · from $149/mo
Email warm-up and reputation repair through a network of seed inboxes.
- Warmup Inbox also covers email campaigns.
- 2.2GPA
GlockApps
Free plan · from $59/mo
Inbox placement testing with DMARC analytics and uptime monitoring.
- GlockApps has a free plan. Warmup Inbox does not, though it has a free trial.
- Warmup Inbox also covers email campaigns and inbox warm-up.
- GlockApps also covers dMARC.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
14
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 Warmup Inbox free?
No, Warmup Inbox is a paid product, but you can try it first. 7-day free trial of any plan, no credit card required.
How much does Warmup Inbox cost?
Warmup Inbox lists 4 plans. Basic: $15 per inbox / month, billed annually ($19 monthly).
What platforms does Warmup Inbox work on?
Warmup Inbox is available on Web.
Does Warmup Inbox offer any discounts?
Warmup Inbox publicly lists the following: Save 20% with annual billing.
Does Warmup Inbox have an Android app?
No Android app was listed when its pages were read on Oct 18, 2026. Warmup Inbox is listed for Web.
Does Warmup Inbox have an iPhone app?
No iPhone app was listed when its pages were read on Oct 18, 2026. Warmup Inbox is listed for Web.
Is Warmup Inbox open source?
Warmup Inbox is not described as open source on its own site, as read on Oct 18, 2026.
Does Warmup Inbox have an API?
Yes. Warmup Inbox offers a public API, according to its own site.
What does Warmup Inbox integrate with?
Warmup Inbox's listing names Gmail, Google Workspace, Outlook, Microsoft 365, Amazon SES, SendGrid and Zoho Mail.
Who makes Warmup Inbox?
Warmup Inbox is made by CyberPanda s. r. o.
What are the alternatives to Warmup Inbox?
The closest alternatives to Warmup Inbox in our directory are MailReach, Warmy, InboxAlly and GlockApps.
How does Warmup Inbox compare with other email verification and deliverability tools?
Warmup Inbox's GPA of 2.4 is higher than 6 of the 15 other email verification and deliverability tools we grade, and level with 8.
Is Warmup Inbox good value for money?
ToolGPA grades Warmup Inbox B for value for money. Its paid plans start at $15 a month, against a middle price of $28 for the category: 0 of the 7 others that charge start lower.
Could I make my own version of Warmup Inbox?
To replace Warmup Inbox you would be making a network of real inboxes that open and answer your emails.
Where this guide comes from
The prices, plans, platforms and features were read from Warmup Inbox’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 Warmup Inbox'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 CyberPanda s. r. o. Prices change, so check warmupinbox.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
- Warmup Inbox, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/warmup-inbox
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
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, "Warmup Inbox: The Insider's Guide", checked Oct 18, 2026. https://toolgpa.com/tools/warmup-inbox
Know someone choosing between email verification and deliverability tools?
Send them this guide: toolgpa.com/tools/warmup-inbox/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded email verification and deliverability tools after Warmup Inbox, each with an Insider's Guide of its own.
- Email Verification & Deliverability Insider's GuideEvery one of the 16 email verification and deliverability tools we grade, compared
- DeBounce Insider's GuideEmail list validation with credits from $15 that never expire2.6 GPA
- Bouncer Insider's GuideEmail list verification with credits that never expire2.4 GPA
- Clearout Insider's GuideEmail verification, email finder and form checks on one credit balance2.4 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Warmup Inbox’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. Warmup Inbox is a trademark of its owner, and this guide is not made, paid for or approved by CyberPanda s. r. o. Prices and plans change: check warmupinbox.com before you buy.