Warmy vs Lemwarm: Which Email Deliverability Tool Is Better?

I compared Warmforge vs Warmy vs Lemwarm for one common job: keeping a growing set of cold email mailboxes out of spam. Picture a team going from 5 mailboxes to 50, because each mailbox should send only 30 to 50 cold emails a day.

Warmy sells warm-up, seed testing, DMARC monitoring, and expert help to B2B and B2C senders. Lemwarm is the warm-up engine inside lemlist, sold per inbox or bundled with lemlist plans.

I checked all three live pricing pages on October 18, 2026, pulled in-app screenshots, and read recent Trustpilot reviews. I also used the ChannelCrawler case study, where Warmforge testing showed a 100% inbox placement rate.

Email Warm-Up Tools Compared at a Glance: Warmy vs Lemwarm

Here is how the three tools line up on the points that decide a warm-up purchase. Prices come from each vendor's live pricing page on October 18, 2026.

Warmy Overview: Warm-Up, Seed Testing, and Expert Support

Warmy is an email deliverability platform that combines warm-up, seed-list placement tests, DMARC monitoring, and hands-on expert help. It serves B2B senders on Google Workspace and Microsoft 365, and B2C senders on ESPs like Klaviyo and Mailchimp. Its pricing page says 7,000+ businesses rely on it.

Warmy's core features

• 1M+ mailbox network: Warmy says your domains and IPs warm up inside more than one million real business and consumer mailboxes.
• Adeline AI co-pilot: An AI assistant reads your tests, DNS records, and warm-up data, then tells you what to fix next.
• 500K+ US seed list: Seed mailboxes open, reply to, and rescue your emails from spam, and the list rotates every month. This email seed list guide explains how seeds work.
• Verification and DMARC: List verification and a DMARC tracker come built into every plan.
• Google Postmaster data: Postmaster metrics sit next to your warm-up and placement results.
• Reputation tracker and templates AI optimizer: Domain and IP alerts, plus AI scoring of your templates before you send.
• Dedicated expert: The pricing page lists a named deliverability expert and 24/7 human support.

Warmy pricing

Warmy no longer shows a tier table. Its current pricing page lists B2B, B2C, and Custom plans, each "from $49/month." The price follows the volume of warm-up emails Warmy sends for you.

You get a 7-day trial with no card, and real numbers come from a demo. Users are unlimited, but they share the plan's mailbox quota. Third-party trackers still cite the old monthly per-mailbox tiers: Starter about $49, Business $129, Premium $189, Expert $279, and Platinum $429.

Who Warmy is best for

Warmy fits senders who want a managed deliverability service. That includes B2C brands on ESPs and teams that want a named expert watching their account.

Warmy's known limitations

• No public price list. The page offers a demo or trial instead of volume prices.
• No sending tool. Campaigns and replies stay in whatever sequencer you already use.
• Its site footer lists the SOC 2 Type II audit as "in progress," so compliance-led buyers should ask for its status.
• Two 2026 Trustpilot reviewers say they could not cancel online and had to go through a form or a support loop.

What reviewers say about Warmy

Warmy holds a 3.9 TrustScore on Trustpilot. The critical reviews from 2026 focus on weak or fading results, cancellation friction, and pushy sales calls. A September 2026 reviewer says a 4-month engagement costing $15,000 gave only a short-term lift.

The full Warmy review on this blog goes deeper into each feature.

Lemwarm Overview: The Warm-Up Built Into lemlist

Lemwarm is the email warm-up and deliverability tool from lemlist, the sales engagement platform. You can buy it per inbox, and every lemlist plan includes it at no extra cost.

Lemwarm's core features

• Automatic warm-up: Lemwarm sends warm-up emails across a network of 20,000+ healthy domains.
• Human warm-up emails: Lemwarm lists these as a core feature of the Essential plan.
• Deliverability score: A score per inbox, with reports on warm-up emails sent and landed in spam.
• Technical setup check: DNS checks cover MX, SPF, DMARC, and a custom tracking domain.
• Smart plan extras: Personalized warm-up emails, warm-up of your real templates, custom alerts, and an industry-matched network.

Lemwarm pricing

Lemwarm charges per email address. Essential costs $29 per inbox a month on monthly billing, $26 on quarterly, or $24 on yearly. Smart costs $49, $43, or $40, and teams with more than 10 users get custom pricing.

Inside lemlist, the Essential plan costs nothing extra. The lemlist Email plan is $69/mo monthly ($55/mo yearly) for 50,000 emails with unlimited users. Its multichannel plan is $109 per user a month ($87 yearly).

Who Lemwarm is best for

Lemwarm fits teams already paying for lemlist, and solo senders warming one or two inboxes. The lemlist vs Salesforge comparison covers the sequencer side.

Lemwarm's known limitations

• Per-inbox pricing. Twenty inboxes on Essential cost $580 a month on monthly billing.
• Third-party reviews report a cap of 40 warm-up emails per inbox a day on Essential.
• No seed-list placement test in its plans. The score is lemlist's own metric.
• The free version needs a lemlist subscription, so its value drops if you send from another tool.

What reviewers say about Lemwarm

On Trustpilot, Lemwarm's own page holds a single review, a 1-star from August 2024 about how the score behaves.

The Lemwarm review and the Folderly vs Lemwarm comparison cover it in more detail.

Warmforge Overview: Warm-Up, Heat Score™, and Placement Tests

Warmforge is the deliverability layer of the Forge Stack. It warms mailboxes, scores them with Heat Score™, runs Health Checks, and tests inbox placement. It launched in August 2024 and is free with every Salesforge plan.

Warmforge's core features

• One-click AI email warm-up: Connect a mailbox, click once, and warm-up starts. AI-written emails read like real conversations.
• Premium warm-up pool: A curated mix of aged IMAP/SMTP, Google Workspace, and Microsoft 365 mailboxes, with no recycled inboxes.
• Multilingual warm-up activity: Warm-up emails go out in many languages, so traffic looks natural to inbox providers worldwide.
• Heat Score™ tracking: Each mailbox gets a 0-100 score. The app's readiness check asks for at least 85, and Salesforge's guidance is to stay above 97.
• Inbox Placement Tests: Tests across Google, Outlook, and other providers show inbox, promotions, or spam before a campaign goes live.
• Health Checks: Automatic monitoring of DNS records, MX records, and blacklist status, with alerts. See this email health check guide.
• Deliverability Boost: Warm-up emails that land in spam get moved out, which sends a positive signal.
• Always-on warm-up: Warm-up runs all the time, because switching it on and off at random can hurt deliverability.
• Mailbox slots: Each slot covers one mailbox, and you can swap mailboxes in and out freely.
• Mailbox compatibility: Works with Google Workspace, Microsoft 365, and IMAP/SMTP mailboxes from Mailforge and Infraforge.
• API, MCP, and CLI: The Warmforge API, an MCP server, and the Forge CLI let scripts and AI agents check warm-up stats and run placement tests.

Here is Salesforge's own walkthrough of the Warmforge warm-up flow.

Warmforge in the Forge Stack

Warmforge sits under one roof with Mailforge (shared mailboxes), Infraforge (private mailboxes on dedicated IPs), and Primeforge (Google Workspace and Microsoft 365 mailboxes).

Leadsforge finds and verifies leads and passes them to Salesforge with no CSV export. Salesforge sends the sequences, and Primebox™ collects replies from every mailbox. Each product is a separate subscription, but they share one login, connect natively without Zapier, and each exposes an MCP server.

You can also run the stack three ways: with your own team, with Agent Frank (the AI SDR, sold separately), or with a vetted Forge Expert agency.

Warmforge pricing

Warm-up costs $12 per slot a month on monthly billing, $10 on quarterly, or $9 on annual billing. One slot is free. Every subscription includes Health Checks and one free placement test a month.

The Warmforge Placement Tests Pro plan runs 100 tests a month (50 mailboxes per test) for $39/mo monthly or $32.50 annual. The Placement Tests Growth plan runs unlimited tests (250 mailboxes per test) for $169/mo monthly or $140.80 annual.

On any Salesforge plan, warm-up is free with unlimited slots. Salesforge Pro is $48/mo monthly ($40/mo annual), and Salesforge Growth is $96/mo monthly ($80/mo annual). You can verify the live price any time.

Who Warmforge is best for

Warmforge fits cold email teams that keep adding mailboxes, agencies that juggle many domains, and anyone already on Salesforge. For the bundle, Salesforge's own fit is B2B sellers with $5K to $100K deals who target 3,000+ businesses. Salesforge itself says it is a poor fit if you mainly target Fortune 500 companies or long RFP cycles.

One honest boundary: Warmforge warms mailboxes, not ESP sending setups. If your problem is a Klaviyo or Mailchimp newsletter landing in spam, Warmy's B2C plan is built for that and Warmforge is not.

UniteSync ran Salesforge, Mailforge, and Warmforge to an 85.26% positive reply rate and a $2.86 CAC.

Warmforge's honest limitations

• No time-limited free trial, and only one free placement test a month. Regular testing needs a Placement Tests plan.
• Heat Score™ is Warmforge's own metric, so confirm it with placement tests before you scale.

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Head-to-Head Feature Comparison: Warmy vs Lemwarm

Each subsection below answers one buying question. Every tool gets the same labels, so you can scan across. The facts come from each vendor's live site and in-app screens.

Warm-up pool and network quality

• Warmforge: A curated pool of aged IMAP/SMTP, Google Workspace, and Microsoft 365 mailboxes, with multilingual traffic.
• Warmy: Claims 1M+ real mailboxes across business and consumer inboxes, sending in working hours in the recipient's time zone.
• Lemwarm: A network of 20,000+ healthy domains, matched to your industry on the Smart plan.

Pool size is the number vendors like to print. For cold email to companies, I care more about who is in the pool: aged business mailboxes on the same providers your prospects use.

If you mail consumers, Warmy's consumer network is the better fit. Warmforge's pool centers on Google Workspace, Microsoft 365, and aged IMAP/SMTP mailboxes.

Deliverability monitoring and reputation scores

• Warmforge: Heat Score™ per mailbox, Health Checks for DNS, MX, and blacklists, and Deliverability Boost.
• Warmy: Mailbox temperature, a deliverability percentage, a domain and IP reputation tracker, a DMARC tracker, and Google Postmaster data.
• Lemwarm: A deliverability score per inbox, a technical setup check, and custom alerts on Smart.

Warmy goes further on domain monitoring, since its plans add a DMARC tracker and Google Postmaster data.

Still, every one of these scores is a vendor grading its own homework. Treat them as early warnings, and let placement tests give the verdict.

Inbox placement testing

• Warmforge: One free test a month, then 100 tests for $39/mo or unlimited tests for $169/mo on monthly billing.
• Warmy: A deliverability tester plus 500K+ US seed accounts that rotate monthly, in every plan.
• Lemwarm: No seed-list placement test in its plans. Its pricing page lists deliverability reports and setup checks instead.

On seed-list size, Warmy is ahead, with 500K+ US seed accounts advertised. For most cold email teams, the useful part is testing many of your own mailboxes at once.

Warmforge's Placement Tests Pro plan covers 50 mailboxes per test, and its Growth plan covers 250. The free monthly test is enough for a quick check before a launch.

A placement test is the one check here that measures where real emails land, not a vendor's score. Track the result as your inbox placement rate over time, not as a one-off number.

AI and warm-up email content

• Warmforge: AI writes unique warm-up emails in multiple languages.
• Warmy: The Adeline AI co-pilot suggests fixes, and a templates AI optimizer scores and rewrites your campaign emails.
• Lemwarm: Human warm-up emails on Essential, plus personalized emails and warm-up of your real templates on Smart.

Each tool tries to make warm-up traffic look like real mail. Warmforge does it with unique AI emails in many languages, so activity doesn't follow English-only patterns.

Warming your real templates is a Smart-only Lemwarm feature at $49 per inbox a month.

Reply handling and the sending stack

• Warmforge: A warm-up tool, not a sequencer. It pairs natively with Salesforge, where Primebox™ gathers replies from every mailbox into one inbox.
• Warmy: No sequencer or inbox. It works next to 35+ ESPs and outreach tools, so replies stay in your sending tool.
• Lemwarm: A warm-up tool only. Inside lemlist, campaigns and replies run through lemlist; bought alone, they stay in your sending tool.

Primebox™ is included on every Salesforge plan. Its AI reply modes need Salesforge Growth.

For a cold email team, that puts warm-up, sending, and replies under one login. With Warmy, you add a second vendor next to your sequencer.

Pricing and scalability

• Warmforge: $9 to $12 per slot, one slot free, and unlimited free slots with Salesforge.
• Warmy: Volume-based from $49/mo, with quotes through a demo.
• Lemwarm: $24 to $49 per inbox, or Essential free with lemlist from $55/mo yearly.

Per-inbox pricing charges you for the very thing that keeps cold email safe: spreading volume across more mailboxes.

At 100 mailboxes and list prices, Warmforge on annual billing costs $891 a month and Lemwarm Essential costs $2,400. Salesforge Growth at $80/mo annual warms all 100 for free.

Warmforge slots also move between mailboxes, so swapping a burned mailbox for a fresh one adds no cost.

Integrations, infrastructure, and security

• Warmforge: API, MCP server, and Forge CLI. Mailforge, Infraforge, and Primeforge mailboxes connect under the same login, and SOC 2 covers the stack.
• Warmy: A documented API with n8n, Zapier, and Make, plus 35+ ESP integrations. Its SOC 2 Type II audit is listed as in progress.
• Lemwarm: Runs through lemlist, which lists an API, MCP, and CLI on its Email plan.

Infraforge and Primeforge also sell pre-warmed email accounts, which skip the usual two-to-four week wait. Neither Warmy nor Lemwarm lists mailboxes on its pricing page.

Salesforge's own guidance is to keep spare mailboxes warming in the background as replacements. That habit is cheaper when warm-up is free.

Warmforge vs Warmy vs Lemwarm Pricing Compared

All prices below come from each vendor's live pricing page on October 18, 2026. Warmy is the exception for tiers, since its page now shows only a starting price.

The real difference shows up as you grow. Warmforge and Lemwarm both scale per mailbox, but a Warmforge annual slot costs $9 against Lemwarm's $24 to $40 yearly. Warmy prices by warm-up volume, but its pricing page shows no volume prices.

Cost scenario: warming 20 mailboxes

Sending 1,000 cold emails a day takes about 20 to 30 mailboxes at 30 to 50 emails each. Here is what warming 20 of them costs per month.

• Warmforge on its own: 19 paid slots plus the free one, so $228 on monthly billing or $171 on annual billing.
• Warmforge inside Salesforge Pro: $48 monthly ($40 annual), with warm-up for all 20 included and a sending tool on top.
• Lemwarm Essential: $580 monthly or $480 yearly. Lemwarm Smart: $980 monthly or $800 yearly.
• Warmy: no public figure. At the old $49 Starter rate trackers still cite, 20 mailboxes run about $980, so get a quote.

If you already pay for lemlist, Lemwarm Essential costs nothing extra. Then the fair match is the lemlist Email plan at $69/mo monthly against Salesforge Pro at $48/mo monthly. Both include warm-up, but the lemlist plan has unlimited users, while Salesforge Pro has one user and unlimited users start on Salesforge Growth.

Who Should Use Warmforge, Warmy, or Lemwarm

Here is the short version, based on the facts above.

Final Verdict: Which Email Warm-Up Tool to Choose

For more matchups, browse more tool comparisons, or check a domain with the free deliverability tools.

Frequently Asked Questions About Warmforge, Warmy, and Lemwarm