Customer.io vs Kit (formerly ConvertKit)
Side-by-side trajectory, velocity, and editorial themes.
Design Studio becomes the one surface where every Customer.io message is built
Customer.io is consolidating message creation around Design Studio, its newer visual editor, and steadily retiring the classic drag-and-drop path. Recent releases add global styling, brand variants, an email review/readiness panel, and a no-code notification inbox — all authored in the same place. The in-app messaging surface is also maturing, now with dark-mode-aware styling across web, iOS, and Android.
The clear direction is Design Studio as the single composition layer for email, in-app, and inbox, with migration tooling to pull legacy content forward and quality gates (SpamAssassin scoring, link/image validation) built in. In parallel, Customer.io is threading its AI Agent and Salesforce sync templates into setup flows to cut configuration work. Expect fewer standalone editors and more capability folded into Design Studio.
Next moves likely deepen Design Studio: broader global-component reuse and further deprecation of the classic editor, plus more Agent-assisted authoring beyond Salesforce field mapping.
Kit pushes past email tooling toward audience intelligence and AI-tool access.
Kit (formerly ConvertKit) is layering two new capabilities on top of its email and automation core: subscriber intelligence and AI-tool integration. Alongside those, it shipped a navigation redesign, a rebuilt landing page editor, and a rename of Creator profile to Newsletter site. The base product keeps getting incremental search and editor polish while the headline bets are data and AI.
The direction is from send-and-automate toward understand-your-audience and operate-Kit-from-anywhere. Subscriber Signals adds an audience data layer that competes with standalone enrichment tools, while the Kit MCP exposes the platform to external AI assistants. Together they reposition Kit as creator infrastructure rather than just an email sender.
Expect Subscriber Signals to move from early access toward general availability and the MCP to graduate from beta with broader write actions across lists, sequences, and broadcasts.
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