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Warmbly vs Promu

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Warmbly compared with Promu
DetailWarmbly logo WarmblyPromu logo Promu
What it doesOpen-source cold email and warmup platform AI lead generation and cold email outreach platform for B2B teams
StageStartup MVP
Founded2024 Not given
Based inGB NL
Pricing modelFreemium Free trial
PricingNot given Starter plan: €37 a month for 5,000 emails and 100 Lead Finder leads. Plans priced by the number of emails sent. 14-day free trial for up to 250 leads with 5,000 emails and 300 assistant chat messages.
Key features
  • Mailbox warmup with automatic reputation building
  • Campaign sequences with A/B testing
  • Unified inbox with reply classification
  • Deliverability tracking and inbox placement tests
  • Automation workflows with conditional logic
  • Per-mailbox safety caps and throttling
  • AI-powered lead research and prospect finding
  • Personalized email writing in your voice
  • Email approval workflow with optional auto-send
  • Deliverability protection with SPF, DKIM and DMARC
  • Address verification and intelligent pacing
  • Integrations with HubSpot, Pipedrive and Salesforce
  • Lead Finder database for new prospect discovery
  • CSV and Google Sheet import
  • Unibox for team conversation management
  • API, webhooks and A/B testing on Scale plan
What makes it different
  • Fully open-source codebase under Apache 2.0, readable on GitHub
  • Self-hostable with one command or cloud-hosted options
  • Unlimited mailboxes on paid plans, no per-mailbox fees
  • Transparent health rules with full explanations for throttling
  • Built in public with public changelog and no inflated metrics
  • Finds prospects AND writes personalized emails, not just templates
  • Learns your tone and voice from your emails
  • Data stored only in EU with data processing agreement
  • Pay per email sent, not per seat or inbox
  • Built-in deliverability and sender reputation protection
Community votes00
DR (Domain Rating by Ahrefs)26 no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)00
Citation Flow (Majestic)284
Referring domains (Majestic)441

6 details filled in for both companies.

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