ResonanceMetrics is the only platform that combines technical audits and AI tracking to maximize your visibility on ChatGPT, Claude, Gemini, and Perplexity. As a solo founder, you can benefit from an in-depth analysis of your site in under 60 seconds, automatically generate customer personas, and track your visibility across multiple LLMs. With a unified score, you can prioritize the necessary actions to enhance your online presence. The platform is operational in less than 5 minutes, allowing you to quickly access valuable insights for your GEO strategy.

Listmonk
Free and open source self-hosted newsletter and mailing list manager.
Open-source newsletter manager
One-way Mailing Lists
Manage millions of subscribers with single and double opt-in lists, and segment them using SQL queries.
Built-in Analytics
Visualize campaign performance, track bounces, and identify top links across campaigns.
Dynamic Email Templating
Create powerful email templates using Go templating, a drag-and-drop builder, or plain text.
High Performance
Multi-threaded, high-throughput email queues with sliding window rate limiting for optimal delivery.
Transactional Emails
Send arbitrary transactional messages through a simple API using pre-defined templates.
Extensibility
Integrate with various messaging platforms through HTTP webhooks for SMS, WhatsApp, and more.
Privacy Control
Full privacy control for subscribers with OIDC SSO authentication and granular roles.
Free tier available
Free
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One-way Mailing Lists
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Built-in Analytics
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Dynamic Email Templating