Warmup Inbox is a standalone email warmup tool priced strictly per inbox: $15/inbox/month on Basic, $49 on Pro, $79 on Max. Warmerly charges a flat $19/month for 5 mailboxes and $49 for 25, so the two are closest in cost at a single mailbox and diverge with every one you add.
The cheaper, specialised alternative. Warmup-only, warmup included on every mailbox, daily auth checks, 5-provider placement insight.
Per-inbox pricing against a flat rate — the maths diverges fast.
| Warmerly | Warmup Inbox | |
|---|---|---|
| Pricing model | Flat, mailbox count set by plan | Per inbox, every tier |
| 1 mailbox | $19 | $15 |
| 5 mailboxes | $19 flat | $75 (Basic) |
| 25 mailboxes | $49 flat | $375 (Basic) |
| Annual discount | Check current pricing page | 20% off, billed yearly |
| Agency / volume pricing | Agency plan, flat | Custom past 15 inboxes, discounts past 50 |
| Auth monitoring (SPF/DKIM/DMARC) | Daily, with remediation copy, all tiers | Deliverability features on higher tiers |
| Spam-folder rescue interval | 10 minutes | Check current docs |
| Campaign sending included | Yes, unmetered on paid plans | No — warmup only |
| LinkedIn / WhatsApp channels | Yes | No |
| Free plan / trial | Free plan (no card), or a 7-day trial | 7-day trial |
This one is decided almost entirely by how many mailboxes you run. If it is one, Warmup Inbox is $4/month cheaper and a focused, well-built warmup tool — take it. If it is five, you are choosing between $75 and $19 for the same job, and at twenty-five it is $375 against $49. Per-inbox pricing is not a trick, it is just a model that suits single-mailbox users and punishes everyone else; Warmerly's flat rate does the reverse. Work out your mailbox count first and the answer falls out on its own.
At one mailbox, yes — $15/month against $19. At any number above one, no, and the gap widens quickly because Warmup Inbox charges per inbox while Warmerly is flat. Five mailboxes is $75 against $19; twenty-five is $375 against $49.
$15 per inbox per month on Basic, $49 per inbox on Pro, and $79 per inbox on Max, with 20% off for annual billing and custom pricing for agencies running 15+ inboxes. The figure to watch is that every tier multiplies by inbox count. Verify current pricing at warmupinbox.com.
No. Warmup Inbox is warmup-only, so you pair it with a separate campaign sender. Warmerly includes campaign sending, a unified inbox, email finding and verification, and LinkedIn and WhatsApp channels on the same plan — which matters if you are consolidating tools and does not if you already have a sender you like.
Connect a mailbox to Warmerly in 60 seconds. Free plan, no card required. Paid plans start with a 7-day trial, first charge on day 8, cancel any time before then. We will warm right alongside whatever you use now, so you can A/B without commitment.