Warming up
Transactional email API
Instantly is a popular all-in-one cold email and warmup platform. It is the most-marketed name in the category, with the highest brand recognition and the highest price tag.
The cheaper, specialised alternative. Warmup-only, warmup included on every mailbox, daily auth checks, 5-provider placement insight.
Cold email at scale, with warmup bundled.
| Warmerly | Instantly.ai | |
|---|---|---|
| Starting price (per month) | $19 | $47 |
| Mailboxes on starting plan | 5 | Unlimited |
| Emails per month on starting plan | Unlimited | 5,000 |
| Contacts on starting plan | 5,000 active prospects | 1,000 uploaded |
| Warmup emails | Unlimited | Unlimited |
| Spam-folder rescue interval | 10 minutes | 30 minutes |
| Reply with quoted history | Yes | Yes |
| Inbox placement seeds | Same- and cross-provider | 2 providers |
| Health score timeline | Granular per event | Daily snapshot |
| SPF/DKIM/DMARC monitoring | Daily, with remediation copy | Pass/fail badge only |
| Built-in campaign sender | Yes, no cap on sends | Yes |
| LinkedIn steps in the same sequence | Yes ($50/account) | Via a separate tool (Aimfox/HeyReach) |
| API access | Agency plan | Higher tiers |
| USD/GBP billing & EU data residency | Yes | No |
| Free plan / trial | Free plan (no card), or a 7-day trial | Limited free, then paid |
| Try before you pay | Free plan (no card) + 7-day trial; no refunds after the first charge | 7-day refund window |
Both warm your mailboxes and send your campaigns. Warmerly does it from $19 instead of $47, with no cap on sends, faster spam rescue and daily DNS monitoring, and adds LinkedIn and WhatsApp steps to the same sequence. Instantly has the bigger brand, a longer track record at volume and more native CRM integrations. If you want to keep Instantly as your sender, Warmerly can also run warmup alone on the same mailboxes.
Yes. You can turn Warmerly's campaigns off and let it only warm the mailbox, while Instantly, lemlist, Apollo, Outreach or any other tool sends from the same Gmail or Microsoft account. Or you can move the sending into Warmerly and drop the second subscription.
No. Instantly's network is larger by mailbox count. Warmerly's network is smaller but every peer is health-graded and bad peers are quarantined within 24 hours. In practice, both will give you healthy pairing within a week.
Disconnect the mailbox from Instantly, connect it to Warmerly via the same OAuth flow, pick a ramp curve. Total time: under 2 minutes per mailbox. No DNS changes needed.
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.