Choosing the right email warmup tool is one of the fastest ways to protect email deliverability when you are scaling cold email. Warmup software simulates realistic sending and engagement so Gmail, Outlook, and other providers see a trusted pattern—not a brand-new domain blasting hundreds of messages overnight.

This listicle ranks seven real products teams actually use: standalone warmers and cold-email platforms that bundle warmup. For definitions, timelines, and setup mistakes, read our complete guide to email warmup tools and the broader comparison in email warmup tools. If you are auditing the full stack, our roundup of email deliverability tools adds verification, DNS checks, and monitoring options beyond warmup alone.

Lemwarm (Lemlist)

Lemwarm is Lemlist’s dedicated deliverability product: it connects your inbox to a large peer network and automates gradual volume ramps, replies, and engagement patterns so new or cold domains look like normal business mail.

Key features include deliverability reporting, warmup content tailored to your industry on higher tiers, and tight integration if you already run sequences in Lemlist. It is a strong fit when you want warmup plus a sales engagement layer from one vendor rather than stitching tools together.

Pricing is typically structured in two public tiers—Essential and Smart—with annual discounts on Lemlist’s site; exact numbers change, so confirm on lemlist.com/lemwarm. Lemwarm is often included for active Lemlist customers on qualifying plans, which can make it the path of least resistance for existing Lemlist teams.

Best for: Outbound teams already in (or considering) Lemlist who want native warmup and deliverability analytics without a separate login.

Mailreach

Mailreach markets itself as a deliverability-focused platform: automated warmup, spam placement testing, and DNS reputation checks rolled into workflows designed to answer “why am I landing in spam?” with data—not guesses.

Standout capabilities include seed-list style testing context (depending on plan), a reputation dashboard, and guidance surfaced as recommendations you can act on quickly. If your problem is inbox placement and diagnosis rather than sequencing alone, Mailreach’s positioning is deliberately narrow and deep.

Public pricing is commonly quoted per mailbox per month (often around twenty U.S. dollars at list rates) with an annual billing option; they also promote a separate spam-tester plan for teams that mostly need monitoring. Verify current tiers on mailreach.co.

Best for: Operators who want warmup plus ongoing deliverability testing and coaching-style insights—not just a volume ramp.

TrulyInbox

TrulyInbox differentiates on economics: instead of charging per inbox on every tier, it sells daily warmup email volume and allows multiple connected accounts within those limits. That can materially lower cost when you manage many mailboxes for clients or multi-domain outbound.

Features usually include AI-generated warmup copy, multiple warmup strategies, and analytics at the mailbox or campaign level. Vendors sometimes offer a free trial or very light starter allowance for low daily volume, which can help you validate DNS basics before you pay—confirm terms on their site.

Starter, Growth, and Scale plans are listed publicly with monthly and annual pricing; heavy agency-style usage may need a custom quote. Check trulyinbox.com/pricing for the numbers that apply to your stack.

Best for: Agencies and outbound teams warming many inboxes who want predictable monthly cost tied to throughput, not seat math.

Warmbox

Warmbox is a standalone warmer with broad provider support—Google Workspace, Microsoft 365, SMTP inboxes, and several transactional providers—plus scheduling controls so engagement looks human (growth, flat, or randomized curves).

All plans on Warmbox’s pricing page include the same feature set: automated interactions, spam-folder rescue flows, GPT-assisted “realistic” content, DNS and blacklist monitoring, and reporting dashboards. That makes comparisons between its tiers mostly about how many inboxes and how many warmup emails per day you need.

At the time of writing, Warmbox lists Solo at about $19/month monthly or $15/month billed yearly for one inbox (50 warmup emails/day), with stepped plans for three and six inboxes. Enterprise-style bundles are quote-based.

Best for: Teams that want a focused warmup product with transparent tiering and deep ESP coverage—without paying for a full sequencer.

Warmup Inbox

Warmup Inbox is another dedicated warmer built around per-inbox plans, AI-assisted content suggestions, and reputation monitoring. The product emphasizes simple onboarding: connect the mailbox, pick a ramp, and let the network generate replies and thread activity.

Higher tiers add capacity (more warmup messages per day), scheduled warmup windows, and advanced tuning for specific providers—useful when one client cluster is sensitive to Microsoft deliverability while another is mostly Google.

Pricing is typically per inbox, with Basic often near $19/month (lower with annual billing) for a starter daily volume, and Pro/Max tiers for heavier throughput. A short trial is commonly available. Confirm live numbers on warmupinbox.com/pricing.

Best for: Small teams and founders who want a straightforward dedicated warmer with clear per-mailbox pricing and a fast time-to-value.

Instantly

Instantly is best known as a cold email platform, but its unlimited email warmup is a headline feature on Outreach plans: connect many sending accounts, run warmup in parallel with (or before) live campaigns, and keep reputation metrics inside the same workspace as sequencing.

Capabilities include large private warmup networks, slow ramp modes, and deliverability analytics adjacent to campaign stats—helpful when the same operator owns both “fix reputation” and “send campaigns.” Instantly also sells lead data and verification adjacent products; you can ignore those if you only care about warmup, but bundled packaging is why teams consolidate here.

Published Outreach pricing starts around $47/month for Growth on monthly billing (lower per month on annual), with higher tiers for more contacts and monthly send volume. Warmup is included as unlimited on those plans as of Instantly’s public pricing page—still verify details before purchase.

Best for: Teams that want one vendor for multi-mailbox outbound plus warmup, especially agencies managing many inboxes under one subscription.

Smartlead

Smartlead is an AI-forward cold email system with unlimited mailboxes as a core pitch and a warmup pool integrated into the same infrastructure as sending. That matters when you rotate domains and inboxes frequently: you are not negotiating per-mailbox warmup fees on every new sender.

On Smartlead’s public pricing, Smart and Prime tiers show the warmup pool included; Base and Pro may list the warmup pool as a paid add-on in the feature matrix—treat that as a reason to read the checkout screen carefully. Smartlead also sells deliverability testing (SmartDelivery) and verification as separate add-ons if you want placement tests beyond warmup.

Entry plans often start near $39/month before add-ons, with large jumps for unlimited-contact tiers. If warmup is your only need, Smartlead can be more tool than necessary; if you already run high-volume outbound through it, bundled warmup is efficient.

Best for: Power users scaling many inboxes who already want Smartlead’s master inbox, automations, and API-driven workflows.

Woodpecker

Woodpecker combines cold email automation with deliverability tooling: ESP-aware sending patterns, domain audits (SPF/DKIM), spam-word checks, and a built-in warmup flow described as AI-generated conversations with real accounts. Warmup is positioned as something you run before and during campaigns—not a bolt-on afterthought.

Woodpecker’s pricing calculator shows a monthly allocation of free warmups tied to your prospect tier, with additional warmups available as an infrastructure-style add-on (commonly around $5/month per extra warmed mailbox in their configurator). Unlimited email accounts and unlimited team members are part of its differentiation story.

Because Woodpecker is a full sequencer, it competes with Instantly and Smartlead as much as with standalone warmers. Choose it when you want conservative sending controls, strong compliance positioning, and warmup inside a mature campaign builder.

Best for: B2B teams that want campaign execution plus warmup in one place and prefer Woodpecker’s workflow and deliverability monitoring UX.

Bottom line

The best email warmup tool is the one your team will actually run for three to four weeks without interruption—warmup only works with consistency. Start from your constraints: budget per mailbox, how many inboxes you run, and whether you still need a sequencer. Standalone tools (Warmbox, Warmup Inbox, Mailreach, TrulyInbox) keep stacks modular; platforms (Instantly, Smartlead, Woodpecker, Lemwarm via Lemlist) reduce tab sprawl but bundle cost and onboarding.

Use this list to shortlist, then confirm pricing and warmup limits on each vendor’s site before you commit. Pair any warmup tool with list hygiene and authentication discipline: our email deliverability checklist covers SPF, DKIM, DMARC, and volume basics, and primary domain vs cold email domain explains when to isolate outbound from brand mail.

Warmup fixes sender reputation; it does not fix bad prospect data. If you are launching outbound, combine reliable warmup with verified emails and mobile numbers from a waterfall enrichment platform. FullEnrich is built for that layer—it is not a warmup tool, but it complements one by pulling deliverable contact data from 20+ providers. Start with 50 free enrichment credits, no credit card required, and keep the addresses that power your campaigns accurate while your warmup tool builds trust with inbox providers.