Flux
The growth agent for your email list
Flux is a lightweight widget that asks website visitors a single question and collects their email address in return, giving site owners both a subscriber and the reason behind their interest. It is designed to replace passive email capture tools such as pop-ups and footer newsletter forms, which collect addresses without gathering context. Answers and subscriber data can be synced to email marketing platforms like Kit and Beehiiv, with answers attached as tags.
The widget can be connected to AI assistants including Claude, Cursor, ChatGPT, and any MCP client. The assistant analyzes analytics to identify drop-off points, generates A/B test variants of the widget copy, and runs tests on real visitors while keeping the original text live until a winner is approved. Flux offers basic and advanced analytics, quiz-based subscriber segmentation, custom branding, and custom integrations. It is hosted in Europe and described as GDPR compliant.
Flux is aimed at website owners and newsletter creators who want to grow an email list while learning what their audience wants. A free plan includes 10 active flows and basic analytics, with a stated allowance of 500 emails and no credit card required. A Pro plan adds unlimited flows, advanced analytics, segmentation, and custom branding, with a free trial available. An Enterprise edition offers unlimited flows, priority support, custom integrations, and an SLA guarantee.
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