Overloop vs Warmbly
Overloop
overloop.comWarmbly
warmbly.comSide by side
| Figure | Overloop | Warmbly |
|---|---|---|
| Price from | $69/mo | $15/mo |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 3 | 6 |
| Spec score · Cold Email Software | 8.2 (#12) | 7.8 (#25) |
| Campaigns | Campaigns combine email and LinkedIn steps with timing and conditions, and track opens, clicks and replies. | Campaign sequences can branch on opens, clicks and replies, use A/B variants, and send follow-ups in the same conversation thread. |
| Compliance | The pricing page lists CASA Tier 2 certification for handling sensitive data. | Warmbly describes its data handling as GDPR-aligned and lists SOC 2 Type II and ISO 27001 as planned, with no certification claimed. |
| Headquarters | Brussels, Belgium | London, United Kingdom |
| Integrations | Slack, Zapier and the Chrome extension are listed as basic integrations; HubSpot and Pipedrive are included on Growth, and Salesforce on Enterprise. | The listed integrations include HubSpot, Salesforce, Pipedrive, Close, Zapier, Make, n8n, Slack, Discord, Calendly and Cal.com; Google Sheets lead sync is available on demand. |
| Product | Overloop helps find B2B prospects, get contact details and run personalized email and LinkedIn outreach sequences. | Warmbly is an open-source cold outreach platform that combines email warmup, sending, inbox, campaigns, analytics and CRM. |
| Security | Overloop says it encrypts data in transit with TLS and uses Cloudflare for DDoS protection. | 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 | Starter and Growth include chat support; Enterprise includes priority chat and email support and a dedicated Customer Success Manager. | 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.