Lemwarm vs TrulyInbox: Email Warmup Tool Comparison

Lemwarm vs TrulyInbox: Email Warmup Tool Comparison

TrulyInbox puts the argument against its competitor on its own pricing page: ten accounts warmed by a per-account tool at about $33 each comes to $333 a month, against $84 on its Growth plan. Lemwarm is a per-account tool, at $29 an account. That makes this pair unusually easy to reason about, because the two vendors disagree about what a warmup tool should charge for, and the disagreement is arithmetic rather than opinion.

The short answer

Pick TrulyInbox if you are warming more than about four mailboxes. It bills for warmup emails sent rather than accounts connected, and its pricing page says so directly: pay for emails sent, not accounts connected, and connect as many accounts as you want. The Starter plan is $29 a month for 200 warmup emails a day across unlimited accounts.

Pick Lemwarm if you are on lemlist, where it is included with every plan, or if you are warming one or two mailboxes and want warm-up that runs on your real campaign templates. Lemwarm's page lists Essential at $29 per email account and Smart at $49.

At one mailbox the two entry prices are the same number. Every mailbox after that is free on one side and $29 on the other, which is the entire article.

The billing units are different, and that is the whole comparison

Most warmup tools meter the same thing, so most warmup comparisons come down to features. This pair does not.

Lemwarm pricing

Source: Lemwarm pricing

TrulyInbox pricing

TrulyInbox also publishes the sizing rule it expects you to use, which is rare and useful: warmup runs on a 2:1 ratio, two warmup emails for every one cold email, every day and ongoing. Its tiers name the inbox counts they suit on that basis: about 3 inboxes on Starter, 15 on Growth, 50 on Scale and 100 on Scale Plus. Each tier also carries a reply-rate ceiling rather than one number for the product: up to 25% on Starter, 45% on Growth, 60% on Scale and 65% on Scale Plus.

Source: TrulyInbox pricing

$29Lemwarm Essential

per email account per month

$29TrulyInbox Starter

200 warmup emails a day, unlimited accounts

2:1TrulyInbox sizing rule

two warmup emails per cold email, published on its pricing page

The arithmetic, and why it flips so fast

Here is an invented but arithmetically honest worked example. The inbox counts are chosen to show where the curves cross. No part of it comes from a customer, and the rates are the published ones.

Sizing TrulyInbox needs one step, using the vendor's own 2:1 rule: an inbox sending 30 cold emails a day needs 60 warmup emails a day, so a plan's daily volume divided by 60 gives the inboxes it covers.

The two lines are the same at one inbox and diverge immediately, because one of them is flat between tier boundaries and the other never is. By ten inboxes TrulyInbox is about a third of the cost; by fifty it is about a seventh.

TrulyInbox runs a version of this comparison on its own page, at ten accounts, reaching $333 against $84. Our table reaches $290 against $99 for the same count, because we used Lemwarm's published $29 rather than the roughly $33 the vendor assumed and because we sized the tier from the 2:1 rule rather than from the vendor's suggested inbox count. The direction is the same and the size of the gap is roughly the same, which is the useful part.

What you give up by paying less

A comparison that only produced that table would be advertising. Three things go the other way.

A shared daily allowance is a shared constraint. On TrulyInbox the volume is pooled across every connected account, so adding inboxes without moving tier means each one warms more slowly. Lemwarm's per-account price buys per-account volume that nothing else competes for.

Lemwarm can warm on your real templates. The Smart plan warms using your actual campaign copy and tailors the warm-up network to your industry. Warmup traffic that resembles the mail you actually send is a better rehearsal than generic conversation, and TrulyInbox's equivalent is AI-generated content by topic and industry rather than your own templates.

If you already own it, free beats cheap. Every lemlist plan includes lemwarm. A lemlist customer moving to TrulyInbox is adding a bill, not replacing one.

Lemwarm lists

• A warm-up network of 20k+ healthy domains
• Human warm-up emails
• A technical setup check covering SPF, DKIM and DMARC
• Deliverability reports and a score
• Personalised warm-up on your real email templates, Smart plan
• An industry-tailored warm-up network, Smart plan
• Included with every lemlist plan

TrulyInbox lists

• Billing by warmup emails sent rather than accounts connected
• Unlimited connected accounts on every paid tier
• Four warmup strategies selectable by mailbox profile
• AI warmup content by topic and industry
• Deliverability intelligence and a daily score
• Analytics and targeting broken out by email provider
• A published 2:1 warmup to cold email sizing rule

Who should pick which

Lemwarm or TrulyInbox

• ✓Yes: You already pay for lemlist. Lemwarm is included, so use it.
• ✓Yes: You are warming more than four mailboxes and paying for warmup separately. Pick TrulyInbox.
• ✓Yes: Your mailbox count changes month to month as clients come and go. Pick TrulyInbox, where adding accounts does not add a line.
• ~Depends: You want warmup traffic that mirrors your real campaign copy. Pick Lemwarm Smart.
• ~Depends: You are warming exactly one mailbox. The entry prices are identical, so decide on features rather than cost.
• ✓Yes: You want each mailbox to warm at full speed regardless of how many others you run. Pick Lemwarm, where volume is not pooled.

Switching between them

Both connect mailboxes over OAuth for Google and Microsoft or SMTP for anything else, and neither holds a list you would need to export, so the migration is mechanically trivial and operationally worth some care.

Run the two in parallel for a week rather than cutting over. Warmup works by sustained daily volume, and a mailbox whose pattern stops and restarts reads worse to a provider than one that was never warmed at all.

Moving to TrulyInbox has one sizing step the other direction does not. Work out your total daily cold volume across every mailbox, double it per the 2:1 rule, and buy the tier that covers the result. Teams that skip this buy Starter for fifteen inboxes and quietly warm each of them at a seventh of the rate they needed, which looks like the tool underperforming.

Moving to Lemwarm has the opposite trap. The bill is per account and there is no plan boundary to warn you, so a growing mailbox count raises the invoice with nothing prompting a review.

Where warmup sits in a cold outbound stack

Warmup is infrastructure. It raises the odds that a message lands somewhere a human will see it, and it has no opinion on whether the message was worth sending.

The way we run campaigns puts unusual weight on that. One message per prospect, no bumps and no thread replies, means there is no second touch to rescue a first one that went to spam. Placement is the whole campaign, and warmup is the cheapest thing that moves it.

It also explains why the per-mailbox arithmetic above matters more than it looks. Sending volume in cold outbound comes from many mailboxes each sending modestly, because per-mailbox velocity is what providers punish. A model that charges per account is charging you for the architecture that keeps you deliverable.

Neither tool tells you the thing you want to know, which is whether real prospects saw the mail. A deliverability score is a proxy for that, and reply rate on real sends is the measurement. See the cold email pricing guide for how a warmup line compares with the rest of the budget, and the warmup roundup for the field beyond these two.

The decision, in one paragraph

Count your mailboxes. At one, the two entry prices are the same $29 and you should choose on whether real-template warm-up matters to you. Above four, TrulyInbox's pooled-volume model is cheaper by a margin that grows with every mailbox you add, and the pooling is the only real cost of that. The exception swallows a lot of readers: if you pay for lemlist, Lemwarm is already included in that subscription, and the cheapest warmup tool is the one you have already bought.

Related Reading

• Best Lemwarm Alternatives in 2026
• Best TrulyInbox Alternatives in 2026
• Lemwarm vs Mailreach: Email Warmup Tool Comparison
• Mailreach vs TrulyInbox: Email Warmup Tool Comparison
• Best Email Warmup Tools for Cold Email Teams

If you would rather not run the infrastructure at all, RevenueFlow books qualified meetings on a pay-per-meeting basis and publishes client results.

Pricing and features are taken from the vendors' own pages. Verify current terms with the vendor before relying on them.