Instantly Warmup vs Lemwarm (2026): Free vs Paid Add-On Compared

Instantly Warmup and Lemwarm aren't standalone products by default. They're the deliverability engines built into two sending platforms, Instantly and lemlist. Instantly bundles unlimited warmup free starting at $47/month (Growth plan), per Instantly's pricing page. Lemlist bundles lemwarm free starting at $69/month (Email plan), per lemlist's pricing page, though lemwarm also sells standalone from $29/month per inbox at lemwarm.com, no lemlist subscription required.

Instantly Warmup vs Lemwarm: 2026 Comparison Table

Comparison Axis	Instantly Warmup	Lemwarm	Verdict
Pricing	Free and unlimited on every plan: Growth $47/month, Scale $194/month, Agency $555/month, per Instantly's pricing page.	Free with every lemlist plan (Email $69/month, Multichannel $109/month per user), or standalone at lemwarm.com: Essential $29/month, Smart $49/month per inbox, no lemlist required.	Instantly if you want warmup without a multichannel platform attached; standalone lemwarm if you just want warmup alone.
Core capability	Headless-browser network opens, reads, and replies to warmup emails, then ramps volume daily: 2, 4, 6 emails per day and climbing.	Automatic real-inbox-to-real-inbox email exchanges at a pace you set, per lemwarm's pricing page.	Similar mechanics. Instantly exposes more granular ramp controls.
Deliverability features	Custom open-rate, response-rate, and spam-placement targets plus a dedicated deliverability dashboard.	A deliverability hub tracking warmup, outreach, and inbox placement together.	Tie. Both give visibility before a campaign goes live.
Integrations	Built into Instantly's own sending, lead database, and AI Sales Agent stack.	Standalone: works with any sending tool. Bundled: built into lemlist's multichannel stack (email, LinkedIn, calls, SMS).	Lemwarm's standalone version is the more flexible integration if you send from elsewhere.
Best-fit team size	Solo founders up to agencies on the $555/month Agency bundle.	Standalone: any team on any sending tool. Bundled: teams already paying per-seat for lemlist Multichannel at $109/month.	Instantly for high-volume single-channel senders, lemwarm standalone for teams on other platforms.

How does Instantly's warmup feature actually work?

Instantly's warmup runs on a private network of 1,000,000+ real email accounts, per Instantly's product page. It opens, reads, and replies to your warmup emails automatically using headless browsers, then ramps volume slowly: 2 emails on day one, 4 on day two, 6 on day three, and up from there.

You can set a target open rate, response rate, and spam-placement threshold per inbox. A deliverability dashboard tracks how many warmup emails land in the inbox versus spam, so a reputation problem shows up before it touches a real prospect list. Warmup is unlimited and included on every paid plan, from the $47/month Growth tier up to the $555/month Agency bundle, per Instantly's pricing page.

How does Lemwarm build sender reputation?

Lemwarm automatically exchanges real emails between real inboxes and gradually increases volume on a pace you set, per lemwarm's own site. It monitors warmup, outreach, and inbox placement together in one deliverability hub, so a drop in placement rate shows up before it wrecks a live campaign.

Lemwarm is sold two ways. Every lemlist plan includes it free, starting at $69/month for the Email plan and $109/month per user for Multichannel, per lemlist's pricing page. It's also sold as a fully standalone product at lemwarm.com, from $29/month per inbox on the Essential tier and $49/month on the Smart tier, with no lemlist subscription needed at all.

Which costs more in 2026, Instantly or Lemwarm?

Warmup itself is effectively free if you're already paying for a bundled platform. The real comparison is what you have to buy to get it, or whether you'd rather buy warmup alone.

• Instantly Growth: $47/month for unlimited mailboxes and unlimited warmup, per Instantly's pricing page.
• Instantly Scale: $194/month, adds an AI reply agent and advanced deliverability controls.
• lemlist Email: $69/month, 50,000 emails/month with lemwarm included free, per lemlist's pricing page.
• lemlist Multichannel: $109/month per user, adds LinkedIn, SMS, and a call dialer.
• Lemwarm standalone: $29/month (Essential) or $49/month (Smart) per inbox at lemwarm.com, no lemlist required.

If all you want is warmup and you're sending from a different tool (Smartlead, Apollo, your own SMTP), standalone lemwarm at $29/month per inbox is the cheapest single-purpose option here, cheaper than Instantly's $47/month Growth plan if you only need one or two inboxes warmed. If you're already sending at volume through Instantly, its free bundled warmup wins since you'd be paying for the sending platform anyway.

Which should you actually use?

If you're sending high-volume cold email through Instantly and want the cheapest entry point with unlimited mailboxes, its $47/month Growth plan is the better buy. Its 1,000,000+ account network and daily ramp schedule are built for exactly this. If you're already running multichannel outbound through lemlist, lemwarm is already paid for. If you're sending from a third-party platform without native warmup, standalone lemwarm at $29 to $49/month per inbox is a genuine, independent option worth comparing against Instantly's bundled price.

FAQ: Instantly Warmup vs Lemwarm

Is Instantly's email warmup really free?

Yes. Warmup is unlimited and bundled into every Instantly plan, including the $47/month Growth tier, per Instantly's pricing page. There's no separate warmup fee or credit cost.

Is Lemwarm free with lemlist, or do you pay separately?

Every lemlist plan includes lemwarm at no extra cost, starting at $69/month for the Email plan, per lemlist's pricing page. Lemwarm is also sold standalone from $29/month per inbox for teams not using lemlist to send.

How long should you run warmup before starting a cold email campaign?

Most deliverability setups run warmup for at least 2 to 3 weeks before sending cold campaigns, ramping daily volume gradually instead of jumping straight to full send volume. Both Instantly and lemwarm use this slow-ramp approach by default.

Can you use Lemwarm without using lemlist to send your campaigns?

Yes. Lemwarm is available as a fully standalone product at lemwarm.com starting at $29/month per inbox, and does not require a lemlist subscription, per lemwarm.com's pricing page.

By Rishabh Ambasta, Founder, Modern Inbound.

Running warmup and cold email infrastructure yourself eats a founder's week every month. If you'd rather hand off the domains, inboxes, and deliverability setup to a team that's booked 3,000+ qualified B2B meetings doing exactly this, see how Modern Inbound's setup service works.