Kosaku - Beautify the content

History, redesigned — browse every card you've made in a monthly grid with image previews. Switch platforms instantly with the new floating filter.

Featured as App Store Editor's Pick of the Week.

Paste a link, pick a style — your social media post becomes a beautiful card in seconds.

Web Cards

Paste any URL and Kosaku extracts the content into a clean card. One-tap AI summary turns long articles into sharp highlights.

Social Media Cards

Works with Twitter/X, Threads, Instagram, and more. Just copy a public post link and generate a card instantly.

Music Cards

Copy a music link to create a card with album art and lyrics.

Markdown Rendering

Render Markdown content visually — code blocks, quotes, and lists look great on a card. Perfect for developers and writers sharing technical content.

Customize Everything

• Gradient backgrounds and solid color themes
• Custom fonts
• Flexible layouts
• High-resolution export

Kosaku Pro is an optional paid subscription that unlocks member-exclusive features.

The subscription renews automatically within 24 hours before expiration. To cancel, do so at least 24 hours before the renewal date. Manage subscriptions: iPhone Settings → Apple ID → Subscriptions

Privacy Policy: https://kosaku.yichenlab.com/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/