About WarmOpener

Making email personalization accessible to every team with AI-powered automation and transparent pricing.

The Problem We're Solving

Email marketing is more competitive than ever. Generic mass emails don't work anymore. Personalization is the key to getting replies, but manually personalizing hundreds or thousands of emails is impossible.

We built WarmOpener to solve this problem. By combining the power of AI with an intuitive interface, we make it possible for any team to generate unique, relevant content for each contact at scale.

Whether you're a sales team reaching out to prospects, a recruiter engaging candidates, or an agency managing client campaigns, WarmOpener helps you send emails that feel personal because they are.

Our Principles

Use your own OpenAI API key with zero markup

Full data ownership and export rights

Enterprise-grade security and encryption

No vendor lock-in, cancel anytime

Transparent pricing with no hidden fees

Privacy-first design and development

What Makes Us Different

Your API Key, Your Control

We don't mark up AI costs. Use your own OpenAI API key and pay OpenAI directly. This keeps costs transparent and gives you full control over your AI usage.

Privacy First Design

Your data stays secure with enterprise-grade encryption and row-level security. We never access your contacts or email content without explicit permission.

No Vendor Lock-in

Export your data anytime in standard CSV format. Full ownership of your contacts and campaigns. Cancel anytime, no questions asked.

Built for Marketers

Simple, intuitive interface that doesn't require technical expertise. Get started in 5 minutes, not 5 days.

Built on Reliable Technology

WarmOpener is built on proven, secure infrastructure that scales with your business needs.

Frontend & Security

Next.js 15 for fast performance
TypeScript for reliability
Clerk for enterprise auth

Backend & AI

Supabase for secure data
OpenAI GPT integration
Gmail API for delivery
Start free • Upgrade to send

Ready to get started?

Join teams using WarmOpener to transform their email outreach. Start free today.

About | WarmOpener