TrulyInbox Vs Warmbox: One Scales With You, The Other Scales Against You

Both TrulyInbox and Warmbox promise better email deliverability through warm-up.

Both deliver on that promise.

But add a second inbox, and the experience diverges.

The cost diverges even more.

No proper head-to-head exists between these two tools. So I tested both and pulled everything apart.

Here’s what this blog covers:

• Hands-on testing of both tools
• Feature-by-feature comparison with clear verdicts
• Pricing math at 1, 3, 5, 10, and 20 inboxes
• What real users say (and where reviews are missing)

Disclosure: I work with TrulyInbox. This comparison is based on hands-on testing and publicly available data. I’ll call out where Warmbox wins.

TL;DR – TrulyInbox Vs Warmbox Summary

TrulyInbox wins this comparison. It’s not particularly close.

Both tools:

• Simulate human-like interactions and engagement: opens, replies, spam folder rescues.
• Offer advanced warm up customization options

The core warm-up is functionally identical. The difference is mainly in the pricing.

• TrulyInbox warms up unlimited inboxes starting at $29/month.
• Warmbox charges $19/month for 1 inbox, then jumps to $79/month for 3.

That’s $26 per inbox. The cost scales against you.

Here’s what else separates them:

• Health checks: TrulyInbox runs them automatically on connect. Warmbox requires a manual test email.
• Sending schedules: TrulyInbox offers day-by-day time window control. Warmbox doesn’t.
• Recipient ESP Prioritization: TrulyInbox lets you prioritize the ESPs you want to warm up with. Warmbox doesn’t have this.
• Free access: TrulyInbox has a forever-free plan and 7-day trial. Warmbox has neither.

Below, I break down the pricing math at scale and compare every feature side by side.

What You’re Really Choosing Between with TrulyInbox and Warmbox

Let’s cut through the marketing. Both tools do the same thing at the core.

The real question isn’t which tool warms up better.

It’s which one gives you more value as you grow.

Where TrulyInbox and Warmbox Overlap (What’s Basically the Same)

Before diving into differences, here’s what’s identical:

• Both use peer-to-peer warm-up with private inbox networks
• Both simulate human-like interactions (opens, replies, spam removal)
• Both offer Progressive, Flat, and Randomized warm-up strategies
• Both use AI-generated warm-up email content
• Both support Gmail, Outlook, Zoho, and SMTP-connected ESPs
• Both check domain blacklist, IP blacklist, SPF, DKIM, and DMARC
• Both produce deliverability reports

These tools solve the same problem the same way. The difference isn’t in what they do.

It’s in how they price it and what extras they include.

Where TrulyInbox and Warmbox Actually Differ (The Trade-Offs That Matter)

Six differences should actually drive your decision.

1. Pricing model

TrulyInbox is volume-based with unlimited inboxes on every paid plan.

Warmbox is tier-based but effectively per-inbox:

• $19/month for 1 inbox
• $79/month for 3 inboxes ($26/inbox)
• $159/month for 6 inboxes ($26.50/inbox)

The per-inbox cost increases as you upgrade. That’s the opposite of how volume pricing should work.

2. Free access

TrulyInbox has a forever-free plan (1 inbox, 10 warm-up emails/day). Plus a 7-day free trial on all paid plans.

Warmbox has no free trial and no free plan. You pay before you test.

3. Health check automation

TrulyInbox runs health checks automatically the moment you connect an inbox.

MX Record, IP Blacklist, Domain Blacklist, DMARC, DKIM, SPF.

All visible in the dashboard. Zero extra steps.

Warmbox requires you to send an email to a test address to trigger their checker.

4. TrulyInbox-exclusive features

• Email Sending Schedule: Day-by-day time window control (e.g., Monday to Friday 09:00 to 20:00, weekends excluded)
• Recipients’ ESP Prioritization: Control what percentage of warm-up emails go to Google, Microsoft, or other providers

5. Warmbox-exclusive feature

Email content spamminess check via SpamAssassin scoring. It analyzes your email copy and flags spam triggers. TrulyInbox doesn’t have this diagnostic.

6. Review credibility

TrulyInbox has verified G2 reviews. Warmbox isn’t listed on G2, Capterra, or Trustpilot.

The only public reviews are on Product Hunt. Mostly outdated. Mostly negative.

TrulyInbox Vs Warmbox: Pricing Breakdown – What It Actually Costs at Scale

This is where the comparison gets uncomfortable for Warmbox. Let’s do the math.

TrulyInbox Pricing

TrulyInbox prices on email volume, not inbox count. Every paid plan includes unlimited inboxes.

Key takeaways:

• Add 50 inboxes? Same price. Your bill doesn’t change.
• 7-day free trial on all paid plans. Test everything before committing.
• Forever-free plan for anyone warming up a single inbox.

Warmbox Pricing

Warmbox prices per inbox tier. Here’s what that looks like:

Notice something?

The per-inbox cost increases as you upgrade.

• On Solo, you pay $19/month/inbox.
• On Startup and Growth, $26.33 and $26.5/month/inbox, respectively.

The math just does not work.

Cost Comparison at Scale (The Math That Matters)

Here’s what happens to your bill as you add inboxes:

At 3 inboxes, Warmbox already costs nearly 3x more.

At 6+, Warmbox doesn’t even have a standard plan. TrulyInbox covers 20 inboxes at $79/month.

The pricing models point in opposite directions. TrulyInbox gets cheaper per inbox as you scale.

Warmbox gets more expensive.

TrulyInbox Vs Warmbox: Feature-by-Feature Comparison

Same warm-up mechanism. Different everything else. Here’s how each feature stacks up based on hands-on testing.

Warm-Up Strategy Options

TrulyInbox offers three strategies:

• Progressive: Set starting volume, daily increase amount, and max sending limit. Visual ramp-up graph included.
• Randomise: Varies daily volume to mimic human-like sending patterns.
• Flat Warm-up: Fixed daily volume for accounts with established reputation.

Warmbox offers four strategies:

• Grow-Progressive: Their most recommended mode for building reputation.
• Flat: Consistent daily volume.
• Randomized: Varied daily volume.
• Custom: Advanced mode with controls for timing, min/max emails, and reply rate.

Verdict: Functionally comparable. Both cover the core strategies well.

Warmbox has a dedicated Custom mode. TrulyInbox gives numerical control over starting volume, increase rate, and ceiling. Both delivered 90%+ inbox placement in testing.

Email & Domain Health Checks

TrulyInbox runs checks automatically on inbox connect. Zero extra steps.

What it checks:

• MX Record validation
• IP Blacklist (with count)
• Domain Blacklist (with count)
• DMARC, DKIM, SPF status

Everything shows in the dashboard with a deliverability score (e.g., 92%).

Warmbox has a broader checklist. But it requires a manual trigger.

You send an email to a test address ([email protected]) to run it. What it checks:

• Domain blacklist and IP blacklist
• SpamAssassin score (email content spamminess)
• SPF, DKIM, DMARC
• Reverse DNS, domain age, list-unsubscribe header
• Broken links and short URL detection

Verdict: It depends on what you need.

SpamAssassin content scoring is Warmbox’s standout. TrulyInbox doesn’t match it. But TrulyInbox’s automatic checks mean you see health data instantly.

For daily monitoring, TrulyInbox wins on convenience. For deep one-off diagnostics, Warmbox goes further.

Email Sending Schedule

TrulyInbox gives you full day-by-day scheduling.

Set custom time windows for each day. Monday to Friday 09:00 to 20:00, weekends excluded. Timezone selection with weekday/everyday toggle.

Warmbox offers a timing range with start and end dates. Less granular. No day-of-week control.

Verdict: TrulyInbox wins.

Day-by-day scheduling makes warm-up mirror real human sending patterns. If you don’t send on weekends, your warm-up shouldn’t either.

Recipients’ ESP Prioritization

TrulyInbox offers custom ESP split with slider control.

Set percentages like 50% Google, 40% Microsoft, 10% Others. Auto and Custom modes available.

Warmbox has no equivalent feature.

Verdict: TrulyInbox wins.

If most of your cold email recipients use Gmail, focus warm-up reputation on Google. Practical advantage with no Warmbox equivalent.

Reporting & Analytics

TrulyInbox reporting includes:

• Deliverability score percentage
• 7-day received count
• Visual warm-up progress charts with color-coded stages (sent, today, ramping, at max)
• ESP-specific tracking

Warmbox reporting includes:

• Deliverability score
• Periodic reports
• Reputation monitoring
• Bar chart showing daily warm-up volume

Verdict: TrulyInbox’s reporting is more visual and actionable at a glance.

The color-coded ramp-up chart shows exactly where you are in the warm-up process. Quick to scan, easy to act on.

Integrations

TrulyInbox integrates directly with Saleshandy. Warm-up and cold outreach in one workflow. Your warm-up data flows into your outreach platform.

Warmbox is a standalone tool. No notable outreach platform integrations.

Verdict: If you use Saleshandy, TrulyInbox plugs in directly. Warmbox stays siloed.

Where Warmbox Genuinely Wins (Honestly, It’s Hard to Say)

I tried to find areas where Warmbox clearly beats TrulyInbox. It was harder than expected.

The one genuine gap: SpamAssassin content scoring.

Warmbox’s checker includes a SpamAssassin score. It analyzes your actual email content and flags spam triggers.

If your email copy uses phrases or patterns that spam filters hate, this catches them. TrulyInbox doesn’t have this. Real feature gap.

But here’s the context.

SpamAssassin scoring is a diagnostic feature. It doesn’t affect how warm-up runs or how fast your reputation builds.

It’s useful for troubleshooting why a template lands in spam. Not a reason to pick a warm-up tool.

The single-inbox price edge.

Warmbox Solo is $19/month for 1 inbox. TrulyInbox Starter is $29/month. That’s $10/month difference.

But TrulyInbox has a forever-free plan for 1 inbox. And the moment you add a second inbox, TrulyInbox’s pricing advantage becomes massive.

Bottom line: Apart from the content spamminess check, every feature Warmbox offers, TrulyInbox matches or beats, and at a fraction of the cost.

Which Tool Should You Pick?

Find your scenario. Get your answer.

Warming up 1 inbox and want to pay nothing?

TrulyInbox. Forever-free plan. Done.

Warming up 1 inbox and willing to pay?

Warmbox is $10/month cheaper ($19 vs $29). But you lose the free trial and verified reviews. TrulyInbox still offers more features at $29.

Warming up 2 to 3 inboxes?

TrulyInbox at $29/month vs Warmbox at $79/month. Not close.

Warming up 5+ inboxes?

TrulyInbox. Warmbox doesn’t have a standard plan above 6 inboxes.

Need email content spam scoring?

Warmbox. SpamAssassin content checker is the one feature TrulyInbox doesn’t match.

Already using Saleshandy?

TrulyInbox. Direct integration. No contest.

Want to test before paying?

TrulyInbox. 7-day free trial plus forever-free plan. Warmbox has neither.

FAQs About TrulyInbox Vs Warmbox

1. Is TrulyInbox better than Warmbox?

For most users, yes. TrulyInbox is cheaper at scale, offers a free plan, runs health checks automatically, and has verified G2 reviews. Warmbox’s only exclusive feature is SpamAssassin content scoring.

2. How much does Warmbox cost for 10 inboxes?

Warmbox’s highest standard plan covers 6 inboxes at $159/month. For 10+, you need custom pricing. TrulyInbox covers 10 inboxes at $79/month on the Growth plan.

3. Does TrulyInbox have warm-up customization like Warmbox?

Yes. Progressive, Randomise, and Flat strategies with control over volume, increase rate, and max limit. Plus ESP Prioritization and day-by-day sending schedules that Warmbox doesn’t have.

4. Does Warmbox have a free trial?

No. No free trial and no free plan. TrulyInbox offers both a 7-day free trial and a forever-free plan.

5. Can I use both TrulyInbox and Warmbox together?

Technically yes, but no practical reason to. Both use peer-to-peer warm-up. Pick one based on inbox count and budget.

6. Do TrulyInbox and Warmbox use the same warm-up approach?

Yes. Both use peer-to-peer warm-up with private inbox networks and AI-generated content. The differences are in pricing, features, and automation.