Countdown · Days Until & Timer vs Causal Loop Diagram

Trusted by people Track your wedding, vacation, birthday — every moment that matters. Beautiful lock screen widgets. Apple Watch. Turn important dates into unforgettable moments. With Countdown, you can create beautiful countdowns for birthdays, trips, goals, events and any date that matters to you. ⏱ KEY FEATURES • Create unlimited countdowns • Widgets for Home Screen and Lock Screen • Clean, minimalist and easy-to-use design • Customize colors and styles • Smart notifications so you never forget important dates • Fast performance and optimized for iOS SMART WIDGETS See your upcoming events directly on your Home Screen or Lock Screen. Check the remaining time at a glance. FULL CUSTOMIZATION Choose colors, layouts and styles that match your iPhone. Every countdown can have its own visual identity. REMINDERS & NOTIFICATIONS Get notified before an event happens. Perfect for birthdays, appointments and special occasions. BUILT FOR iOS Designed with performance, privacy and native iOS integration in mind. Download now and stay on top of every important moment.

"Causal Loop Diagram" is a fast, focused editor for sketching causal loop diagrams (CLDs) on iPhone — a foundational tool of systems thinking. Place variables, draw arrows, set polarities (+/−), and the app automatically detects feedback loops and classifies the whole diagram against well-known systems-thinking archetypes. — Features — ■ Simple drawing • Tap empty area to add a node, then tap source → target to link • Long-press an arrow to add a delay marker (||) • Drag nodes freely; pinch to zoom; one-finger drag on empty area to pan ■ Automatic loop detection • The moment a cycle closes, an R (reinforcing) or B (balancing) badge appears • Each loop is numbered (R1, R2, B1, B2…) so overlapping loops stay distinguishable • Tap a badge to highlight that loop's interior; other loops dim ■ Nine archetypes auto-classified • Reinforcing loop / Balancing loop • Limits to Growth • Fixes that Fail • Shifting the Burden • Escalation • Success to the Successful • Tragedy of the Commons • Growth and Underinvestment ■ Seven curated samples Familiar themes — study, family, sibling rivalry — to learn each archetype by example: • Study Habit (R) • Calibrating to Target Score (B) • Limits to Growth: Fatigue • Shifting the Burden: Escapism • Fixes that Fail: All-nighter • Escalation: Sibling Rivalry • Tragedy of the Commons: Parent's Attention ■ Privacy • No network access at all • No account, no sign-in • No analytics or tracking SDKs • Diagrams stored only in UserDefaults; uninstalling removes everything ■ Other • Japanese / English UI, one-tap switch • Save multiple diagrams locally with custom names • iOS 16+ (iPhone 8 and later) — Who is this for — • Students of systems thinking and system dynamics • Managers and designers who think in structures • Anyone who wants to step back and see the loops in their own habits, relationships, or work • Educators preparing diagram examples on the fly Pairs naturally with Peter Senge's "The Fifth Discipline" and other systems-thinking textbooks — turn the loops in your head into something you can draw and touch in seconds.