Warmbox vs Warmy (2026): Pricing, Warmup Approach, and Verdict

Warmbox and Warmy both handle email warmup and deliverability monitoring, but the split is stark: Warmbox publishes tiered plans from $15/month, while Warmy uses undisclosed volume-based pricing you can only get on a demo call. Warmbox suits solo senders and small agencies watching budget; Warmy fits larger teams that want a dedicated deliverability expert.

Warmbox vs Warmy at a Glance

Warmbox wins on price transparency. Warmy wins on monitoring depth, if you'll sit through a sales call to learn the price. The table below covers the five things that decide which tool fits your stack.

Comparison Point	Warmbox	Warmy	Edge
Starting price	$15/mo, 1 inbox, billed yearly	Volume-based, undisclosed until a demo	Warmbox
Warmup approach	GPT-4 hybrid interactions across a 35,000-inbox private network	AI-driven warmup plus a seed list for inbox placement testing	Tie
Deliverability monitoring	Spam score tracking, DNS and blacklist checker	Google Postmaster integration with real-time domain reputation data	Warmy
Contract terms	Monthly or yearly, cancel anytime, no sales call to buy	7-day free trial, but paid plans require a demo to get a price	Warmbox
Best-fit team size	Solo senders and small agencies, 1 to 6 inboxes per plan	Mid-market and larger teams running higher warmup volume	Tie

How much does Warmbox cost vs Warmy in 2026?

Warmbox's yearly billing starts at $15/month for the Solo plan, 1 inbox and 50 emails/day, rising to $69/month for Start-up (3 inboxes) and $139/month for Growth (6 inboxes), per Warmbox's pricing page. Warmy doesn't publish tier prices at all. It prices B2B and B2C warmup plans by email volume and gates that number behind a demo, per Warmy's pricing page.

• Warmbox Solo: $15/mo yearly, $19/mo monthly, 1 inbox, 50 emails/day
• Warmbox Start-up: $69/mo yearly, $79/mo monthly, 3 inboxes, 250 emails/day
• Warmbox Growth: $139/mo yearly, $159/mo monthly, 6 inboxes, 500 emails/day
• Warmbox Team: custom pricing for higher inbox counts
• Warmy B2B, B2C, Custom plans: no listed price, volume-based, quoted after a demo

Where each tool actually wins

Warmbox's strength is that you can see the whole price list before signing up. Warmy's strength is that it plugs into Google Postmaster Tools and hands you a human deliverability expert, not just a dashboard.

Warmbox pros: transparent pricing from $15/mo, per Warmbox's pricing page; a GPT-4 hybrid warmup network of 35,000 private inboxes, per Warmbox's site; wide provider support including Amazon SES, Mailgun, and raw SMTP. Warmbox con: a smaller reported user base, 5,000+ companies per Warmbox's site, versus Warmy's claimed 35,000+ businesses.

Warmy pros: Google Postmaster-integrated deliverability insights most warmup tools skip, plus multiple G2 awards for Spring 2025 and 650,000+ domains improved, per Warmy's site. Warmy cons: no visible pricing without a call, and a feature set that's overkill for one solo inbox.

Which one should you actually buy?

Solo founder or small agency under 10 inboxes, wanting a price before talking to a salesperson? Warmbox is the easier buy, cheaper at every published tier, no demo required just to see a number.

Warmy earns its keep for mid-market teams sending higher volume who want Google Postmaster-level reputation data and a dedicated account expert. That's a real gap Warmbox doesn't close. Most cold email operators fall into the first camp, though, which makes Warmbox the better default.

Frequently Asked Questions

Is Warmbox or Warmy cheaper for a single inbox? Warmbox is cheaper and transparent about it. Its Solo plan is $15/month billed yearly for one inbox at 50 emails/day, per Warmbox's pricing page. Warmy doesn't list a per-inbox price; it prices by total warmup volume after a demo call, per Warmy's pricing page.

Does Warmy publish its pricing anywhere? No. Warmy's pricing page lists three tiers, B2B sender, B2C sender, and Custom, and all three say "volume-based pricing" with no dollar figures shown, routing buyers to book a demo instead, per Warmy's pricing page.

What deliverability monitoring does each tool include? Warmbox includes spam score tracking plus a DNS and blacklist checker on every plan, per Warmbox's site. Warmy connects directly to Google Postmaster Tools for real-time domain reputation data and adds a dedicated deliverability expert account review, per Warmy's site.

Which tool is better for an agency managing multiple client domains? Warmbox's Growth plan covers 6 inboxes for $139/month billed yearly, cheaper per inbox than starting on Warmy's undisclosed volume pricing, per Warmbox's pricing page. Agencies running many client domains should still get a Warmy quote, since its Postmaster data catches reputation issues Warmbox's checker can miss.

Warmup tools fix domain reputation. They don't fix targeting, copy, or reply handling, which is most of what actually determines whether cold email books meetings. If you'd rather hand off the whole outbound motion instead of stitching together a warmup tool, a data source, and a copywriter, that's what Modern Inbound's setup engagement is built for.

By Rishabh Ambasta, Founder, Modern Inbound.