Warmy.io has become one of the most recognized names in email warmup, largely thanks to aggressive marketing and its friendly “Adeline” AI branding.
If you’re reading this, your cold emails are probably landing in spam, and you’ve heard warmup tools can fix that. With dozens of options at wildly different price points, choosing wrong means wasting money on a tool you’ll outgrow in months.
Warmy works well for what it is — but “what it is” has significant limitations most reviews conveniently forget to mention.
As an email deliverability consultant who has helped hundreds of businesses escape the spam folder, I’ve tested Warmy.io extensively and prepared this honest review covering:
- How Adeline’s AI actually works
- Where Warmy falls short for power users
- The true cost of scaling beyond 2 inboxes
- Real-world warmup performance (Gmail vs. Outlook)
- Better alternatives for agencies and high-volume teams
Let’s examine whether Warmy deserves your budget — or if that money is better spent elsewhere.
TLDR: Warmy.io at a glance
For those who need the quick version, here’s the summary.
| Aspect | Verdict |
| Best for | Solo founders warming 1–2 Gmail inboxes |
| Pricing | $49/mo starter — fair for beginners, brutal at scale |
| Standout feature | Adeline AI with 30+ industry topics and languages |
| Biggest weakness | Per-inbox pricing makes scaling prohibitively expensive |
| Top alternative | EmailWarmup.com (transparent pricing, better scalability) |
| Our rating | 3.5/5 |
Is Warmy.io worth the price?
The pricing conversation is where Warmy gets uncomfortable — and where most “reviews” conveniently gloss over the details.
Let me be direct — Warmy.io is reasonably priced if you’re warming a single inbox.
The moment you need two, three, or (heaven forbid) ten inboxes, the math starts working against you.
Pricing tiers
Warmy structures its plans around inbox count and daily warmup volume.
| Plan | Monthly cost | Inboxes | Warmup emails/day |
| Starter | $49 | 1 | 100 |
| Business | $129 | 5 | 300 |
| Premium | $189 | 10 | 1,000 |
| Expert | $279 | 20 | 2,000 |
| Mega Pack | $429+ | Custom | 5,000+ |
Annual billing knocks off roughly two months (the standard SaaS discount dance), but even then, the per-inbox economics don’t fundamentally change.
The scaling problem
A colleague of mine runs a small agency — nothing massive, just 19 client inboxes that need warming.
On Warmy’s pricing model, which pushes past $2,000/month. Meanwhile, tools like EmailWarmup.com and TrulyInbox offer similar functionality for $29–$79 with unlimited inboxes.
The same basic job, 25x the price difference.
Comparison with alternatives
To put Warmy’s pricing in context, here’s how it stacks up against competitors at different scales.
| Feature | Warmy.io (Starter) | Warmy.io (Premium) | EmailWarmup.com | TrulyInbox |
| Starting price | $49/mo | $189/mo | $29/mo | $29/mo |
| Inboxes included | 1 | 10 | Scalable | Unlimited |
| Warmup emails/day | 100 | 1,000 | Custom | Varies |
| Custom topics | ✗ | ✓ | ✓ | ✗ |
| Multi-language | ✗ | ✓ | ✓ | Limited |
| DNS management | ✗ | ✗ | ✓ | ✓ |
| Blacklist monitoring | ✓ | ✓ | ✓ | ✓ |
Hidden costs
The Starter plan looks attractive until you realize what’s missing.
Custom warmup topics, multi-language support, and the ability to upload your own templates are all locked behind Premium ($189/mo) or higher.
For a solo founder who just needs a basic warm-up, that’s fine.
For anyone doing targeted outreach in non-English markets, you’re paying premium prices before you even send a real email.
Warmy does offer a 7-day free trial without requiring a credit card (genuinely appreciated), but the trial runs on limited features. You won’t fully understand what you’re buying until you’re already paying.
Value judgment
For a single Gmail inbox, $49/month is a fair investment for the time saved.
I’ve recommended Warmy to friends in exactly that situation — warming one inbox, just getting started with cold outreach, not ready to deal with technical complexity.
- But if you’re scaling?
- If you’re an agency?
- If you’re running sales operations across multiple domains?
Warmy’s pricing model actively punishes your growth. And that’s a deal-breaker for anyone thinking beyond month one.
What are Warmy.io’s pros and cons?
After testing Warmy across multiple domains (and watching several clients use it over the past year), here’s what actually holds up — and what falls short.
Who should (and shouldn’t) use Warmy.io?
Not every tool is for everyone, and Warmy’s strengths align with a very specific user profile. Here’s my honest assessment of who benefits — and who should look elsewhere.
Recommended if
- You want a completely hands-off, non-technical automated warmup solution
- You’re a solo founder or small team warming 1–2 Gmail-based inboxes
- You value responsive customer support over deep technical control
- You’re new to email deliverability and need guided onboarding
- Budget isn’t your primary concern for a small-scale operation
Not recommended if
- You want infrastructure-level control with built-in DNS management
- You’re cost-conscious and planning to scale within the next 6–12 months
- You’re a power user who needs statistically significant placement testing
- You’re an agency managing 10+ client inboxes (costs become prohibitive fast)
- You need a reliable Outlook or custom SMTP warmup (results are mixed at best)
How does Warmy.io score across key categories?
Breaking down Warmy’s performance category by category reveals where it genuinely excels — and where it falls noticeably short of alternatives.
| Category | Rating | Notes |
| Ease of setup | 4.5/5 | The 25-second setup claim lives up to the marketing — genuinely effortless |
| Warmup effectiveness | 3.5/5 | Strong for Gmail, inconsistent for Outlook and SMTP |
| Reputation monitoring | 3.5/5 | Good dashboard, but no real-time alerts on lower tiers |
| Reporting quality | 3/5 | Clean visuals, but seed list testing is too limited for confident analysis |
| Integration options | 3/5 | Covers major ESPs, but API access is restricted to higher tiers |
| Customer support | 4/5 | Responsive and helpful — one of Warmy’s genuine strengths |
| Value for money | 2.5/5 | Fair at $49 for one inbox; terrible ROI at scale |
| Scalability | 2/5 | Per-inbox model actively punishes growth |
How does Warmy.io actually perform?
Let’s get into the details. I’ve tested Warmy across fresh domains, aged domains, and domains with existing reputation problems. Here’s what I found.
Warmup algorithm
The core of Warmy’s product is Adeline — their AI engine that handles the actual warmup process.
The system works by sending emails from your account to a network of real inboxes, which then perform positive actions:
- Marking emails as important
- Generating contextual replies
- Opening and reading messages
- Rescuing emails from spam folders
The spam rescue feature deserves special mention.
When your email lands in spam on a network inbox, Adeline automatically moves it back to the primary inbox and marks it as important.
For ESPs like Gmail, that’s a powerful positive signal that can genuinely improve your sender reputation over time.
Speed modes
Warmy offers three ramp-up speeds, and your choice here matters more than most users realize.
| Mode | Time to full warmth | Best for |
| Slow | 70–85 days | Fresh domains, maximum safety |
| Medium | 35–45 days | Established domains with minor issues |
| Fast | 24–32 days | Urgent situations (risky) |
I strongly recommend Slow mode for any domain under six months old.
A client of mine tried Fast mode on a fresh domain — eager to start outreach quickly — and ended up triggering suspicion with Gmail.
We had to pause the warmup entirely and restart on Slow. The extra 50 days of patience would have saved two months of headaches.
Topic customization
One feature that genuinely differentiates Warmy is topic-based warm-up content.
Instead of generic “Lorem ipsum” style messages, Adeline generates conversations relevant to your industry: e-commerce, real estate, B2B services, gaming, finance, and 25+ other verticals.
The theory is sound — if you’re a real estate company and your warmup emails discuss real estate topics, the pattern looks more authentic to spam filters.
Whether major ESPs actually analyze content at that granular level is debatable (I’m skeptical), but it certainly doesn’t hurt.
The catch is that topic selection is locked behind Premium ($189/mo). Starter users get generic content only.
Language support
Warmy supports 30+ languages for warmup content, which is genuinely useful for international teams.
If your actual outreach will be in Spanish, having your warmup in Spanish makes logical sense. Same caveat though — language selection requires a premium subscription.
Provider targeting
Advanced settings allow you to prioritize specific ESPs for warmup interactions.
A B2B sender might focus on Google Workspace and Microsoft 365; a B2C sender might emphasize Gmail and Yahoo.
In my testing, Gmail warmup worked reliably. My domain reputation improved steadily over 45 days, and placement testing showed consistent primary inbox delivery.
Outlook was another story.
Results were inconsistent across multiple test domains. One showed improvement — two showed negligible change.
Microsoft’s filters seem particularly adept at identifying warmup network patterns — a concern echoed in community forums and something worth considering if Outlook is your primary target.
Health dashboard
Warmy’s domain health dashboard consolidates several useful metrics:
- Blacklist monitoring
- Overall domain “temperature” score
- SPF, DKIM, DMARC configuration status
- Placement distribution (Primary, Promotions, Spam).
The dashboard itself is clean and beginner-friendly. What’s missing is the ability to actually fix problems from within the platform. If your DKIM is failing,
Warmy will tell you — but you’ll need to configure the solution elsewhere. Tools like Warmforge include built-in DNS management, which is a meaningful advantage for users who want everything in one place.
Placement testing
Warmy’s inbox placement testing sends emails to a seed list and reports where they land. Simple concept, crucial for understanding whether warmup is actually working.
The limitation is that Warmy uses only 5 seed inboxes per ESP. For a quick sanity check, that’s fine.
For statistically meaningful data that you’d actually base decisions on, it’s insufficient. Power users typically want 50+ real inboxes to generate reliable placement percentages.
A friend who runs deliverability for a mid-size SaaS company described Warmy’s testing as “directionally useful but not something I’d stake my job on.” Fair assessment.
Reporting depth
On Starter and Business plans, reporting covers the basics: warmup volume over time, engagement rates, placement distribution, and domain health score.
Premium and above add more granular analytics, but even then, you won’t find the real-time alerts and deep diagnostics that tools focused on enterprise users provide.
The analytics are good enough for most small-scale users — but “good enough” has a ceiling.
Provider integrations
Warmy connects with major email providers, though setup complexity varies.
| Provider | Integration quality | Notes |
| Gmail | Excellent | OAuth connection, minimal friction |
| Google Workspace | Excellent | Same as Gmail |
| Outlook | Mixed | Connection works, but warmup results inconsistent |
| Microsoft 365 | Mixed | Similar issues to Outlook |
| Custom SMTP | Limited | Requires manual SMTP configuration, results unreliable |
If Gmail is your primary inbox, Warmy performs well. If you’re heavily invested in Microsoft’s ecosystem, temper your expectations.
Customer support
Here’s where Warmy genuinely earns points. I’ve submitted several support tickets during testing — questions about configuration, feature clarifications, and one billing inquiry.
Response times averaged under 4 hours during business days, and the answers were actually helpful (not copy-pasted documentation links).
For a tool in this price range, responsive human support is notable. Many competitors either rely entirely on chatbots or take days to respond. Warmy’s support team is a legitimate strength.
API access
Warmy offers API access for programmatic control — but only on Expert ($279/mo) and higher plans.
For developers or teams wanting to integrate warmup into existing workflows, that’s a significant paywall. Competitors like Mailreach offer API access at lower tiers.
What about the “fake traffic” debate?
I’d be doing you a disservice if I didn’t address the elephant in the room.
There’s an ongoing debate in the cold email community about whether automated warmup actually works — or whether Google and Microsoft have become sophisticated enough to detect warmup network patterns.
The argument goes like this.
If thousands of Warmy users are all sending warmup emails to the same network of inboxes, ESPs can identify that pattern and potentially flag it as artificial engagement. Some practitioners argue that manual warmup with real human replies is the only reliable approach.
My take is that automated warmup still provides value, but it’s not magic. The fundamentals matter more:
- Gradual volume increases
- Proper DNS authentication
- Real engagement from actual recipients
- Quality content that avoids spam triggers
Warmup tools like Warmy are a supplement to good practices, not a replacement for them. If your authentication is broken or your content is spammy, no amount of warmup will save you.
Is Warmy.io the right choice for you?
After extensive testing, client feedback, and honest comparison with alternatives, my verdict lands at 3.5/5 — a solid tool with meaningful limitations.
The strengths are real
Warmy’s setup genuinely takes seconds. Adeline AI produces more natural-sounding warmup content than basic competitors. The health dashboard provides useful visibility. Customer support actually responds with helpful answers.
The weaknesses are equally real
Per-inbox pricing becomes punishing at scale. Outlook results are unreliable. Seed list testing is statistically limited. Advanced features are paywalled aggressively.
So what should you do?
Solo founders and small teams warming 1–2 Gmail inboxes who want maximum simplicity and don’t mind paying a premium should still consider Warmy. If that’s you, the tool delivers on its promise.
Agencies, sales teams with multiple domains, anyone targeting Outlook heavily, and budget-conscious operators planning to scale should look elsewhere. The alternatives offer better economics and comparable (or superior) functionality.
Ready for email warmup service that scales with you?
If Warmy’s per-inbox pricing gave you pause — or you’re already managing multiple domains and dreading the monthly bill — EmailWarmup.com offers a smarter path forward. We built our platform for teams that need scalability without the scaling penalty.
EmailWarmup.com offers:
AI-guided warmups mirror your real campaigns — curated by expert copywriters to raise inbox rates.
See inbox vs spam in Gmail/Outlook with our free extension and sent-folder labels for each email.
Run unlimited tests across 50+ mailbox providers with clear inbox, promotions, and spam breakdowns.
Free 1:1 experts who fix SPF/DKIM/DMARC, blacklist issues, segmentation without any limits, or upsells.
Strategy, audits, and campaign optimization to grow opens, clicks, and revenue end-to-end.
Verify the email addresses in your lists with fast and accurate checks, using REST/JSON, SDKs in 8 languages, and 100 free credits for testing.
Whether you’re outgrowing Warmy or starting fresh, we’d love to show you what scalable deliverability looks like.
Frequently asked questions
Here are some commonly asked questions on this topic:
For 1–2 inboxes, yes — the $49/month starter plan delivers genuine value for solo founders who need a hands-off warmup. For scaled operations with 5+ inboxes, the per-inbox pricing model makes alternatives like EmailWarmup.com or TrulyInbox significantly more cost-effective.
Gmail results are reliable and consistent in my testing. Outlook performance is mixed — some users report good results, while others (myself included) saw minimal improvement. If Outlook is your primary target, consider alternatives with better Microsoft track records.
Warmy offers three speed modes: Slow (70–85 days), Medium (35–45 days), and Fast (24–32 days). For fresh domains, Slow mode is strongly recommended to avoid triggering ESP suspicion. Aggressive warmup on new domains can backfire.
The primary differences are pricing structure and technical depth. Warmy charges per inbox (costs multiply as you scale), while EmailWarmup.com offers scalable pricing. EmailWarmup.com also provides built-in DNS management and more robust placement testing — features Warmy lacks even on premium tiers.
Generally, yes — the warmup process follows best practices for building sender reputation. The caveat is that some deliverability experts believe major ESPs can detect warmup network patterns. Automated warmup works best as a supplement to proper authentication and quality content, not a replacement.
Yes — Warmy offers a 7-day free trial without requiring a credit card. The trial runs on limited features, so you won’t experience the full platform until you upgrade to a paid plan. Still, it’s enough time to evaluate the interface and basic warmup functionality.
Warmy monitors blacklists and alerts you to problems, but it doesn’t directly handle blacklist removal. If you’re already listed on Spamhaus, UCEPROTECT, or similar blocklists, you’ll need to pursue delisting separately. Warmup helps prevent future issues more than it resolves existing ones.
Warmy uses a per-inbox pricing model that multiplies costs as you scale, while competitors like TrulyInbox offer flat-rate or unlimited inbox pricing. Warmy’s premium includes AI topic generation and multi-language support, but whether those features justify 25x the cost (at scale) is questionable for most users.
