The best Warmboxalternatives in 2026.

Warmbox does customisable warmup well, but the per-inbox plus per-seat pricing, the mixed-provider pool and the lack of a clear free trial send teams looking. We have ranked the real options below, and said where each one beats HotHawk.

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#	Tool	Best for	From
1	HotHawk	Google and Microsoft warmup, with no per-seat charge	$97/mo
2	TrulyInbox	Flat warmup across a lot of accounts	$22/mo
3	MailReach	Standalone warmup with a proper spam tester	$25/inbox/mo
4	Warmup Inbox	The cheapest entry point for one or two inboxes	$15/inbox/mo
5	Smartlead	Folding warmup into a cheap sender	$39/mo
6	Maildoso	Buying ready-made mailboxes, warmup as an extra	Warmup add-on from $160/mo

First, the why

Why teams look past Warmbox.

Warmbox is a capable, very customisable warmup tool that uses AI-written, human-like content. These are the four things that most often have people shopping around.

You pay per inbox and per seat

Warmbox is priced per plan by inbox count and daily volume, then charges again for every team member. Third-party maths put the Start-up plan near $26 an inbox, before you add a single colleague.

The pool mixes a lot of providers

Warmbox warms across Google and Outlook plus Yahoo, iCloud, AOL, Yandex, Zoho, SendGrid and more. That breadth is lower signal when the people you sell to are on Workspace and Microsoft 365.

No clear free trial

Warmbox does not clearly advertise a free trial, and its Paddle payments are described as non-refundable, so you are effectively paying to find out whether it works for your setup.

Mixed deliverability and high daily volume

Some Product Hunt users still report mail going to spam, and the daily volume per inbox on the entry plans, roughly 83 a day, sits well above the 50-a-day figure many practitioners stick to.

The list

The best Warmbox alternatives, ranked.

HotHawk

from $97/moOur pick

Warmup on real Google and Microsoft inboxes, built into the sender, billed flat.

Where it wins. Where Warmbox runs a mixed network and charges per inbox plus per team member, HotHawk holds its pool to real Google and Microsoft inboxes only, more than 50,000 of them, and bills one flat price no matter how many people are on the account. Warmup is part of every plan, so there is no separate warmup subscription. Risky mailboxes get quarantined and bouncing ones are suspended automatically. You also get the best Master Inbox in cold email and a white-label ClientBox portal, all in at $97 a month with a 7-day trial and no card.

The trade-off. Here is the honest catch on a warmup page: HotHawk is a full sending platform, not a tool you point at a mailbox you send from somewhere else. If you only want to warm a few inboxes alongside a sender you already like, that is a narrower job than what HotHawk is for. You also bring your own leads.

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TrulyInbox

from $22/mo

Standalone warmup billed by volume, not by inbox, with unlimited accounts on paid plans.

Where it wins. Charges by daily warmup volume rather than per inbox, so you can connect unlimited accounts on a paid plan without the bill climbing with every mailbox the way Warmbox does. There is a free-forever tier to test on, and it is the warmup engine Saleshandy bundles in, so it is a known quantity. For pure warmup at scale, the economics are hard to beat.

Where it falls short. The pool is a mixed Gmail, Outlook and IMAP network of around 10,000 accounts, not Google and Microsoft only, and the free tier at 10 a day is too small to warm a real sending mailbox. Volume is shared across every account, so warming each one harder means running fewer.

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MailReach

from $25/inbox/mo

Real Google and Microsoft warmup paired with a mature inbox-placement tester.

Where it wins. Warms on a network of 30,000-plus mostly Google and Microsoft accounts, which is higher signal for B2B than Warmbox’s mixed pool, and pairs it with a dedicated spam test that fires to 30-plus seed inboxes with per-provider diagnostics. The support gets consistently strong reviews, and it carries a 4.7 on G2, which is a fuller review base than Warmbox has.

Where it falls short. It is per inbox at around $25 a mailbox with no free trial, so it scales linearly and you pay before you test. The spam-test credits run out and cost extra, and a few reviewers note the dashboard scores do not always track real open rates.

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Warmup Inbox

from $15/inbox/mo

A low-cost standalone warmup tool with a real-account network and a free trial.

Where it wins. At around $15 an inbox on annual billing it is one of the cheapest ways to warm a single mailbox, and unlike Warmbox it runs a 7-day free trial with no card so you can test first. The network is real Google and Microsoft accounts plus others, and the higher tiers add niche language and ESP-specific warmup.

Where it falls short. The disclosed network is smaller than rivals, which can thin out engagement diversity, the analytics are basic, and the per-inbox cost adds up fast once you are warming a fleet rather than a couple of mailboxes.

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Smartlead

from $39/mo

A full sender with warmup and unlimited mailboxes included on every plan.

Where it wins. Warmup and inbox rotation come bundled with the sender at $39 a month, mailboxes are unlimited, and per-mailbox analytics make a failing inbox easy to spot. For teams warming many mailboxes, it sidesteps the per-inbox plus per-seat maths that makes Warmbox expensive at any size.

Where it falls short. Like HotHawk, it is a full sender rather than standalone warmup, so switching to it is a workflow change, not a like-for-like warmup swap. White-label is a $29 per client add-on, and support is its most common complaint.

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Maildoso

from Warmup add-on from $160/mo

Done-for-you domains and inboxes, with a separate AI warmup add-on.

Where it wins. Its real job is supplying mailboxes: domains and inboxes from around $0.49 each, self-healing mailboxes and IP rotation, spun up in minutes. If your gap is actually inboxes to send from rather than warmup, it fills it well.

Where it falls short. Its warmup is the odd one out here. It runs on AI browser bots rather than real inboxes, costs $160 to $2,000 a month on top of the mailboxes, and covers only Gmail and Outlook, with no Microsoft 365 inboxes at all.

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How we ranked these

Our method.

We ranked these on what matters for warmup that protects a domain: the make-up of the warmup pool, the providers it covers, how much control you get, and the real cost once you count every inbox and every seat. Pricing and features come from each tool’s own website as of June 2026, and the weak points come from public user reviews.

HotHawk is our own product, so we have put it first, and we have been clear that it is a full sending platform rather than a standalone warmup tool, which makes it a bigger switch than swapping one warmup app for another. Warmbox already uses AI-written, human-like content and custom ramp schedules, so we have not pretended that is something only we do. No tool paid to be here, and there are no affiliate links.

FAQ

Warmbox alternatives, answered.

What is the best Warmbox alternative?

It depends on the job. If you want warmup folded into the tool you actually send from, HotHawk or Smartlead include it with no per-inbox or per-seat charge. If you want the cheapest flat-rate warmup across many accounts, TrulyInbox bills by volume rather than inbox. If you want standalone warmup with a proper spam tester, MailReach is the pick. The honest question underneath is often whether you need a separate warmup tool at all.

Why do people switch from Warmbox?

Usually the cost shape, since it charges per inbox and per team member, with no clearly advertised free trial. The mixed-provider pool, and reports of mail still going to spam plus high daily volume per inbox, are the other common reasons teams look elsewhere.

Is there a free Warmbox alternative?

TrulyInbox has a free-forever tier, though at 10 emails a day it is really only for testing. The more practical route to free warmup is bundling it into your sender instead, the way HotHawk and Smartlead do, so there is no separate warmup charge at all. HotHawk runs a 7-day trial with no card, which Warmbox does not clearly offer.

Does Warmbox only warm Google and Microsoft inboxes?

No. Warmbox runs a mixed network covering Google and Outlook plus Yahoo, iCloud, AOL, Yandex, Zoho, SendGrid and other providers. If you specifically want warmup held to real Google and Microsoft inboxes, because that is who your prospects are on, HotHawk and MailReach both keep the pool tighter to those providers.

Do I actually need a standalone warmup tool?

Often not. If your sending platform already warms your mailboxes, like HotHawk does on a pool of real Google and Microsoft inboxes, a separate warmup subscription is just another login and another bill. A standalone tool like Warmbox or TrulyInbox makes sense mainly when you want to warm inboxes you send from somewhere with no warmup of its own.

Comparison based on publicly available information from each provider's website, accurate as of June 2026. Pricing and features change, so check each provider for the latest. Weak points reflect themes in public user reviews, not absolute statements of fact. All product names are trademarks of their respective owners; HotHawk is not affiliated with or endorsed by them. Last updated June 2026.

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