4D Draw vs TippyTip

4D Draw is a simple vector-graphics app that lets you draw 4‑dimensional figures. It represents each point's first three coordinates in the usual way, while using color to represent the fourth coordinate. A built-in Help menu includes a “How to draw” page for an easy start, followed by a page of “4D construction ideas” to set you on your way towards visualizing 4-dimensional space. 4D Draw is intended for geometry students who want to learn to visualize 4‑dimensional space. People looking for a more recreational introduction to 4D should begin with 4D Maze instead. People looking for an even more recreational introduction to modern concepts of space and symmetry may enjoy the Torus Games or KaleidoPaint.

Save useful articles. Capture your thoughts. Listen when it suits you. TippyTip brings saved web links, notes, summaries, and recordings into one personal library. SAVE AND ORGANIZE • Save links from Safari’s share sheet or add them in the app. • Organize your library with tags, favorites, and archives. • Explore connections between articles that share tags. • Export links and notes to CSV. READ AND LISTEN • Write your own notes and summaries. • Record audio notes with your microphone. • Combine saved recordings into podcasts with chapters. • Play saved audio while your screen is locked. OPTIONAL OPENAI FEATURES Use your own OpenAI API account to generate article summaries, tags, and spoken audio. Refresh model choices from your account and choose your preferred text and speech models. Follow processing progress, pause or resume work, and retry incomplete results. Background processing depends on the time iOS makes available. On iOS 26, Continue in background can request additional processing time. YOUR LIBRARY AND OPTIONAL SERVICES Your library is stored on your device. Optional iCloud synchronization stores and syncs your library and audio through your personal iCloud account. When OpenAI is enabled, article text, summary or note text, and generated tags may be sent directly to OpenAI for the features you use. Generated speech sends text to OpenAI; microphone recordings are not sent to OpenAI. Your API key is saved in your device’s Keychain. OpenAI’s handling of requests depends on its service policies and applicable account settings. Manual notes, tagging, and microphone recordings work without an OpenAI key. OpenAI API usage may incur separate charges; a ChatGPT subscription does not include API usage. Pages requiring a login, subscription, or JavaScript may not provide extractable article text. No TippyTip account is required.