EmailWarmup vs WarmEnvelopes
EmailWarmup
emailwarmup.onlineWarmEnvelopes
warmenvelopes.comSide by side
| Figure | EmailWarmup | WarmEnvelopes |
|---|---|---|
| Price from | $19/mo | €9/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | — |
| Plans published | 5 | 2 |
| Spec score · Email Warmup Software | 7.8 (#15) | 8.4 (#5) |
| Data handling | The privacy policy says account data is retained while an account is active and deleted account data is removed within 30 days. | The privacy policy says WarmEnvelopes does not read users' inboxes, sell or share data for advertising, or use analytics cookies unless accepted. |
| Privacy | The privacy policy says the service does not read or store personal email content and stores only AI-generated warmup email content. | The privacy policy says the service does not read users' inboxes and does not sell or share data for advertising. |
| Purpose | EmailWarmup uses AI-generated warmup conversations and automated engagement to help build sender reputation for cold email. | WarmEnvelopes schedules real warm-up emails from a configured domain through the user's Resend account to recipient inboxes they control, to build sending history. |
Plans
EmailWarmup
- Starter$19 a month
- Growth$49 a month
- Agency$149 a month
- CommunityPrice not published
- EnterprisePriced on request
In their own words
EmailWarmup
EmailWarmup is a web and API service that uses AI-generated conversations and automated engagement to warm mailboxes for cold-email sending. Connected mailboxes pair in both directions with active peers, exchanging messages inside the network. AI creates subjects and replies with changing topics and tones, retaining a [WARMUP] subject tag. Slow, medium, and fast schedules gradually raise sending volume over several days. Supported engagement includes threaded replies, reads, stars, spam-folder rescue, and delivery checks. Gmail connects through OAuth, while SMTP/IMAP credentials are also supported; the maker says credentials are encrypted at rest and personal email content is not read or stored. Account data is retained while an account is active and deleted within 30 days after account deletion. A free Community plan lists one mailbox and 10 warmup emails per day. Paid plans start with Starter at $19 a month; Growth is $49 a month and Agency is $149 a month. EmailWarmup does not send outreach campaigns, repair blocklisted domains, or guarantee inbox placement.
WarmEnvelopes
WarmEnvelopes is a web service that schedules genuine warm-up emails from a configured domain through the user’s Resend account. Messages go to inboxes the user controls, or whose owners have consented, to build sending history. Setup requires a verified sending domain and a Resend API key, with a separate key stored for each domain. A scheduler runs every 30 minutes and spreads the daily target across the day. Pro users can set starting volume, daily increases, and a maximum. The library contains more than 1,000 independently written messages in several languages, varying templates and sender names. Each send records its sender, template, delivery status, and errors, while the dashboard shows daily progress. The Free plan costs 0.00 EUR and permits four emails per day per domain across up to 10 domains. Pro costs €9 a month and supports up to 1,000 daily emails. A separate checker reviews SPF, DKIM, DMARC, MX, and blocklist status.