OnCue.so (often called Cue) is a sleek 2026 AI-powered social media scheduler that lets you write once and publish everywhere—across X/Twitter, Bluesky, Instagram, LinkedIn, Facebook, Threads, Mastodon, TikTok (YouTube/Pinterest soon). AI crafts posts in your brand voice, generates images from prompts, suggests improvements, handles threads, auto-schedules at peak times based on real engagement data, plus calendar/queue views, analytics, and a full REST API for custom workflows. Free Starter plan available—perfect for creators, solopreneurs, marketers, and teams tired of tab-switching chaos.