Denshees vs Warmbly
Denshees
denshees.comWarmbly
warmbly.comSide by side
| Figure | Denshees | Warmbly |
|---|---|---|
| Price from | Free | $15/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | — | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 3 | 6 |
| Spec score · Cold Email Software | 8.4 (#7) | 7.8 (#25) |
| Data handling | Denshees says it does not sell personal data or use uploaded contact lists for its own marketing, and deletes campaign data and connected email credentials within 30 days after account deletion. | Warmbly says it encrypts mailbox credentials and message bodies at rest, while payment card data is held by Stripe and does not touch its servers. |
| Headquarters | Jaipur, Rajasthan, India | London, United Kingdom |
| Product | Denshees is an open-source cold email outreach app for campaigns, follow-ups, and managing replies. | Warmbly is an open-source cold outreach platform that combines email warmup, sending, inbox, campaigns, analytics and CRM. |
| Security | The privacy policy lists TLS in transit, encryption at rest for sensitive fields, encrypted email credentials, production data access controls, and regular security reviews. | Warmbly says it uses TLS 1.2 or above in transit and AWS KMS-backed, per-organization AES-256-GCM encryption at the application layer. |
| Support | The self-hosted plan has community support via GitHub, while the Job Hunt Pack includes email support. | The pricing page lists community support for Starter, email for Grow, priority support for Business and dedicated support for Enterprise. |
Plans
Warmbly
- Warmup pool · FreeFree
- Warmup pool · Unlimited$15 a month
- Starter$23 a month
- Grow$71 a month
- Business$263 a month
- EnterprisePriced on request
In their own words
Warmbly
Warmbly is an open-source cold outreach platform that brings email warmup, campaign sending, a unified inbox, analytics, and CRM together. Campaign sequences can branch based on opens, clicks, or replies, include A/B variants, and send follow-ups in the same conversation thread. Sending can be restricted to weekday working hours in a selected timezone. The inbox classifies replies, bounces, out-of-office messages, and clicks across connected mailboxes. Warmbly is available on the web and through an API, or can be self-hosted under Apache 2.0. When a self-hosted installation connects to Warmbly Cloud for warmup, campaigns, contacts, and inbox data remain on the self-hosted server. Integrations include HubSpot, Salesforce, Pipedrive, Close, Zapier, Make, n8n, Slack, Discord, Calendly, and Cal.com; Google Sheets lead sync is available on demand. The free warmup pool supports up to 10 mailboxes. Paid campaign plans include Starter at $23 a month billed annually, with 150 emails per day, and Grow at $71 a month billed annually, with 3,000 emails per day.