Comparison
Warmup Inbox vs Warmy 2026: Pricing & Features Compared
October 11, 2026 · 6 min read
Warmup Inbox costs $19/mo for unlimited inboxes; Warmy caps you at 10 for $29/mo. Full 2026 pricing, feature, and verdict breakdown across 5 warmup tools.
The sending setup
Warmy.io costs $29/mo for 10 mailboxes and climbs fast past that cap, per Warmy's pricing page. Warmup Inbox is a flat $19/mo for unlimited inboxes, but it skips spam-placement scoring and inbox health reports. The strongest Warmup Inbox alternatives in 2026 are Warmy for placement testing, Lemwarm for Lemlist-native teams, and MailReach for a full deliverability dashboard.
By Rishabh Ambasta, Founder, Modern Inbound.
At a glance
- Cheaper for agencies: Warmup Inbox, flat $19/mo covers unlimited mailboxes with no per-inbox fee.
- Deeper deliverability suite: Warmy, spam-placement testing and inbox health scores Warmup Inbox doesn't offer.
- Runner-up for Lemlist users: Lemwarm, warmup bundled into a sequencer you're probably already paying for.
- Honest reframe: neither tool fixes a bad list or weak copy. Warmup just keeps an inbox breathing.
Warmup Inbox vs Warmy and 3 more deliverability tools, compared
Warmup Inbox wins on price per mailbox. Warmy wins on depth, spam-placement testing, DNS checks, and inbox health scoring that Warmup Inbox doesn't touch. Below are five tools we've actually run warmup pools through, with starting price, who they fit, and the one feature that sets each apart.
| Tool | Starting Price | Best For | Standout Feature |
|---|---|---|---|
| Warmup Inbox | $19/mo flat | Agencies running 20+ domains | Unlimited mailboxes, no per-inbox fee |
| Warmy | $29/mo for 10 inboxes | Teams that need placement proof | Spam-placement testing across 15+ providers |
| Lemwarm | Bundled with Lemlist ($59/mo+) | Lemlist-native senders | Warmup runs inside the same sequencing tool |
| Warmbox | $19/mo for 5 inboxes | Solo founders on a tight budget | Simple AI-written warmup threads |
| MailReach | $27/mo for 5 inboxes | Teams wanting one deliverability dashboard | Warmup, spam test, and DNS checker in one view |
1. Warmup Inbox
We've used flat-fee warmup tools across client accounts where mailbox count swings from 10 to 80 in a month. Warmup Inbox's $19/mo covers all of it, per Warmup Inbox's pricing page. That's the whole pitch: it warms, it doesn't bill you per seat.
It does the basics well. Realistic send-and-reply simulation, spam folder recovery, and a daily ramp schedule that doesn't spike volume too fast and trip a provider's filters.
Where it falls short: there's no native spam-placement report. You're warming blind on whether you're actually landing in Gmail's main tab versus Promotions.
2. Warmy
Warmy runs your domain through a spam-placement check across major providers and gives you a score, per Warmy's pricing page. For agencies reporting to clients, that single screenshot does more convincing than a reply-rate graph.
The DNS checker catches SPF, DKIM, and DMARC misconfigurations before they tank a new domain. That's a real failure mode. Most cold email problems trace back to DNS, not copy.
Where it falls short: the mailbox caps bite fast. Ten inboxes sounds fine until you're running three clients at 10 domains each, and now you're paying for three separate accounts instead of one.
Which team size actually needs Warmy's spam-placement testing?
Solo founders sending from 2 to 5 inboxes rarely need a placement score. Agencies billing clients on deliverability or reply rate need it every month, because a client who sees spam-folder landings wants proof the problem is fixed, not a promise.
We run outbound for 18+ B2B clients across recruitment, SaaS, and finance. The accounts that ask for placement data are almost always the ones where a previous vendor burned a domain. Once a client has been through that, they don't trust "it's warmed up, trust me." They want the report.
If you're under 10 mailboxes and don't report to anyone but yourself, Warmup Inbox's flat fee is money better spent elsewhere. Past that, the placement data starts paying for itself in saved client trust.
What does a bad warmup setup actually cost you?
A domain that lands 30% of sends in spam instead of 5% is losing roughly 1 in 4 of its outbound touches before a prospect ever sees the subject line. On a 2,000-email/month motion, that's 500 emails a month doing nothing.
Run the math on a 10-seat SDR team paying $8,000+/mo in base salary plus tools. If deliverability problems cut effective send volume by a quarter, you're paying full headcount for three-quarter output. No warmup tool fixes a list problem or weak copy, but a $19 to $29/mo warmup subscription is cheap insurance against a mistake that costs thousands in wasted SDR hours.
- Bad SPF/DKIM records: domains get flagged before the first send even lands.
- No warmup period: a cold domain sending 200 emails on day one gets throttled by Gmail within a week.
- No placement visibility: you find out you're in spam only after a client asks why replies dried up.
Most teams building their own cold email infrastructure treat warmup as an afterthought. It's the cheapest line item and the one that silently wrecks everything above it.
Too Busy to Run Outbound Yourself?
Modern Inbound handles research, infrastructure, warm-up, account lists, copy tests, sending, replies, and routing. The system has booked 3,000+ B2B meetings and influenced $20M+ in pipeline.
FAQ
Is Warmup Inbox cheaper than Warmy in 2026?
Yes. Warmup Inbox charges a flat $19/mo for unlimited mailboxes, per Warmup Inbox's pricing page. Warmy starts at $29/mo but caps you at 10 inboxes, so the gap widens fast once you're running more than a handful of domains.
Does Warmup Inbox do spam-placement testing?
No. Warmup Inbox handles the warmup ramp and spam-folder recovery, but it doesn't give you a placement score across inbox providers. Warmy and MailReach both build that reporting in natively.
Can I use Warmup Inbox and Warmy at the same time?
You can, but running two warmup tools on the same mailbox usually just duplicates send volume without adding benefit. Pick one based on whether you need placement reporting or just need the ramp done cheaply.
How long should email warmup run before sending cold outreach?
Most new domains need 14 to 21 days of warmup before full-volume cold sending, per standard deliverability practice. Skipping this step is the single most common reason a new domain gets flagged in its first week.
Final verdict: which one should you actually pay for?
Pick Warmup Inbox if you're an agency or a founder running more than 10 mailboxes and don't need to hand a client a placement report. Pick Warmy if deliverability proof is part of what you're selling, or if you've been burned by a domain going to spam without knowing why.
If you'd rather not manage warmup, DNS, and domain health yourself, that's the execution layer Modern Inbound runs for clients: see how pay-per-lead pricing works.
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Rishabh AmbastaFounder, Modern Inbound
Runs a research-led cold email agency measured in delivered replies. Before that, outbound for SaaS teams from $1M to $50M ARR. LinkedIn
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