Cassini: Helping you Write less, post smarter, and stay on brand. Cassini uses Apple Intelligence to generate social media captions for your social media needs. Fast, on-device, and completely private. No subscription.No sign-in. No internet required. POWERED BY APPLE INTELLIGENCE Built on Apple's on-device Foundation Models framework, Cassini generates captions directly on your device. Your content never leaves your iPhone. No cloud processing, no data collection, no cooldown timers. GENERATE CAPTIONS INSTANTLY Enter a prompt, choose your length, and get multiple caption options in seconds. Short, punchy hooks. Long-form storytelling. Everything in between. Tap to copy and you're done. MANAGE YOUR BRANDS Save your brand name, voice, tone, and style once. Cassini saves and applies it automatically every time. Running multiple accounts or clients? Create separate brand profiles for each and switch between them in one tap. WHAT MAKES CASSINI DIFFERENT - No subscription or hidden fees - No account or sign-up required - Works fully offline with Apple Intelligence - Zero cooldown between generations - Multiple caption variations per prompt - Branded captions that match your voice and style - One-tap copy to clipboard - It's just simple. BUILT FOR CREATORS AND MARKETERS Whether you're a solo creator posting daily or managing social for a brand, Cassini removes the blank-page problem. Feed it your event details, product launch, or big announcement and get captions ready to post. YOUR PRIVACY, PROTECTED Because Cassini runs entirely on-device using Apple Intelligence, nothing you type is ever sent to a server. What you create stays yours. Apple Intelligence features require iPhone 16 or later, or iPhone 15 Pro / Pro Max, running iOS 18.1 or later. Cassini is not affiliated with or endorsed by Apple Inc. Apple Intelligence is a trademark of Apple Inc.
