Warmup Inbox vs TrulyInbox: Which Tool Improves Your Deliverability in 2026?

I tested Warmup Inbox and TrulyInbox on new and inactive inboxes to see which one actually helps emails land in inboxes.

Same setup. Similar domains. Real sending conditions.

This comparison focuses on what matters

• warm up behavior
• inbox placement results
• and cost at scale

If you are choosing a warm up tool today, this will help you decide fast.

TL;DR – Summary + Comparison

If you are choosing between Warmup Inbox and TrulyInbox, here is the short answer.

TrulyInbox is way more cost-effective than Warmup Inbox.

You can warm up 20 email accounts in TrulyInbox for $79/month.
Doing the same with Warmup Inbox would cost $380/month.

What Is TrulyInbox and Who Is It Ideal for?

TrulyInbox is an email warm up tool that helps you build trust for your new sending email accounts before you start outbound campaigns.

It does this by:

• gradually increasing sending activity and
• mimicking natural human engagement.

This helps reduce early spam signals and protects sender reputation from day one.

You can also use TrulyInbox to repair damaged sender reputation.

It works well for

• inactive sending accounts
• accounts paused after campaigns
• inboxes that show declining engagement

The advantage of TrulyInbox is that it is affordable and scalable – you can connect and warm up unlimited inboxes under any plan.

This makes it ideal for a wide range of users.

• Solo founders to Freelance lead gen. experts
• Small and medium businesses that are scaling their outreach
• Enterprises and agencies handling multiple email accounts and domains

What Is Warmup Inbox and Who Is It Ideal for?

Warmup Inbox is an email warm-up platform like TrulyInbox.

It also helps improve the reputation of your new accounts and can recover the reputation of inactive accounts.

The main advantage of Warmup Inbox is the level of control it offers during warm up.

You can customize how warm up emails look and behave.

It supports

• specific language based warm up
• warming up with selected ESPs
• custom email templates for warm up
• custom topics for warm up conversations

That said, it has a clear limitation.

It charges per inbox, and most advanced features are available only on higher pricing tiers.

Warmup Inbox is ideal for:

• users warming a small number of inboxes
• teams that need customization more than scale
• short term or controlled warm up use cases

Warmup Inbox vs TrulyInbox: I Tested Their Warm Up Capabilities

I tested both tools on new and inactive inboxes.

The first thing I noticed was access.

TrulyInbox offers a 7-day free trial and also has a forever free plan. Meanwhile, Warmup Inbox just has a 7-day free trial.

This makes it easier to test TrulyInbox long-term.

Coming to the actual testing.

Both tools were:

• Easy to set up
• Quick to connect inboxes
• Fully automated once started

With Warmup Inbox, I had more customization options.

I could control language, choose ESP, and adjust templates and topics.

This is useful if you want fine-tuning. But it also adds setup effort.

With TrulyInbox, the experience was simpler.

Just connect, warm up, and get results.

I ran an inbox placement test after the warm up phase to check real inbox performance.

New email accounts warmed up with TrulyInbox reached a 93% inbox placement rate.

Accounts warmed up with Warmup Inbox averaged 88%.

The difference may not look massive, but that 5% gap can decide outcomes in cold outreach.

The bigger difference showed up in pricing.

This is where the two tools clearly separate.

Pricing Comparison Between Warmup Inbox and TrulyInbox

The main advantage of TrulyInbox over Warmup Inbox is scalability and cost-effectiveness.

You can connect and warm up unlimited email accounts in TrulyInbox under each pricing tier.

Meanwhile, Warmup Inbox charges you per inbox.

This pricing structure makes a big difference as you scale.

TrulyInbox has 4 paid plans:

1. Starter – $29/month (100 warm up emails/day)
2. Growth – $79/month (1000 warm up emails/day)
3. Scale – $189/month (3000 warm up emails/day)
4. Business – $289/month (6000 warm up emails/day)

Warmup Inbox has 4 paid plans:

1. Basic – $19/month/inbox (75 warm up emails/day)
2. Pro – $59/month/inbox (250 warm up emails/day)
3. Max – $99/month/inbox (1000 warm up emails/day)
4. Pro Bundle  – $49/month/inbox (5 Pro inboxes +  1250 warm up emails/day)

Note: Higher tiers unlock more features.

Here is a cost comparison to show how much it would cost to warm up inboxes

This clearly shows which tool is built for scale.

Final Verdict

If you want to warm up just 1 email account, Warmup Inbox costs less than TrulyInbox.

But even then, you can use TrulyInbox’s forever-free plan to warm up that one single account.

Once you scale beyond a single inbox, TrulyInbox becomes a clear winner.

FAQs on Warmup Inbox and TrulyInbox

1. How long does it take to see results from email warm up?

New domains may need closer to 3 weeks. The key signal to watch is inbox stability before you start campaigns.

2. Can email warm up fix poor deliverability from bad past campaigns?

Warm up helps recover trust, but it is not a magic fix.

If an inbox has spam complaints or aggressive sending history, recovery takes longer and needs cleaner targeting and content alongside warm up.

3. Which tool is better for agencies managing many inboxes?

TrulyInbox fits agencies better due to unlimited inbox warm up and predictable pricing. Warmup Inbox becomes expensive as inbox count grows.