Live-preview state of the art (May 2026): Sanity Presentation most mature; Storyblok Visual Editor pioneered iframe pattern; TinaCMS only Git-based with true visual editing

Live-preview landscape as of May 2026:

• Sanity Presentation tool — production-ready with Next.js, Astro, Remix, Expo templates. Uses Content Source Maps + Vercel Stega for in-context overlays. Most mature option per FocusReactive's deep-dive review.
• Storyblok Visual Editor — pioneered the iframe-based click-to-edit pattern; requires StoryblokBridge JS instrumentation. The Storyblok Total Economic Impact™ study (Forrester Consulting, vendor-commissioned) reports 582% ROI over 3 years and content-update cadence improving from "batch changes every 2.5 days to three to four times per day" — treat numbers skeptically, but visual-editing productivity gains are directionally real.
• TinaCMS — only Git-based CMS with true visual editing. Requires useTina hook and Tina Cloud backend (free tier up to 2 users; $49/mo Team Plus for Editorial Workflow). Strong fit for Next.js.
• Payload Live Preview — improving fast, especially for self-hosted use cases. Requires more developer plumbing than Sanity Presentation.
• Keystatic — no live preview. Form-based editing.
• Decap CMS — broadest framework coverage but UI has fallen behind; reserve for Hugo/Jekyll legacy.

Confidence: Verified for tool capabilities; vendor numbers (Storyblok 582% ROI) flagged as vendor-commissioned.

Candid default for visual-preview clients: Sanity Presentation. For Git-based + visual: TinaCMS.