Warming up
Transactional email API
Smartlead is the technically-minded all-in-one. Excellent API, decent warmup, good cross-provider mix, and a price point between Instantly and Warmerly.
The cheaper, specialised alternative. Warmup-only, warmup included on every mailbox, daily auth checks, 5-provider placement insight.
Cold email and warmup with strong API access.
| Warmerly | Smartlead | |
|---|---|---|
| Starting price (per month) | $19 | $39 |
| Mailboxes on starting plan | 5 ($19) or 25 ($49) | Unlimited ($39) |
| Emails per month on starting plan | Unlimited | 6,000 |
| Active leads on starting plan | 5,000 | 2,000 |
| Warmup emails | Unlimited | Unlimited |
| Spam-folder rescue interval | 10 minutes | 10 minutes |
| Reply with quoted history | Yes | Yes |
| Inbox placement seeds | Same- and cross-provider | 3 providers |
| Health score timeline | Per-event | Per-event |
| Built-in campaign sender | Yes, no cap on sends | Yes |
| LinkedIn steps in the same sequence | Yes ($50/account) | Via a separate HeyReach account |
| Native API | Agency plan | All plans |
| USD/GBP billing | Yes | USD only |
| Free plan / trial | Free plan (no card), or a 7-day trial | 50% off the first month, no card |
Smartlead is genuinely good, and both tools now do warmup and campaigns in one place. Warmerly starts lower, never caps sends, and adds LinkedIn and WhatsApp to the same sequence. Smartlead has the richer API on every plan and a longer record at high volume. If you build custom outbound tooling, pick Smartlead; if you want the lower flat price or multichannel sequences, pick Warmerly.
Yes. Leave Warmerly's campaigns off and it only warms the mailbox, while Smartlead sends from the same Gmail or Microsoft account.
Not directly, but the mailbox reputation persists in Gmail and Microsoft regardless of which tool you use. Warmerly's first health snapshot will reflect that reputation within 24 hours.
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.