Build a Personal “What I Did Today” Activity Log Web App (Offline, One File)

Build a quiet, opinionated micro web app that records what I actually did today — without tasks, goals, streaks, or productivity pressure.

This app does not ask me to plan.
It only lets me leave traces of real work after it happened.

Think of it as a digital paper margin, not a productivity dashboard.

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🧠 Core Concept (Unique Twist)

This app treats activity logging as memory capture, not performance tracking.

Rules:
• No “to-do”
• No reminders
• No completion checkmarks
• No productivity scores
• No gamification

The app should feel like:

“I’m leaving a small mark that says: I was here.”

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✍️ Interaction Model (Non-Generic)

One-line capture
• A single, always-focused input at the top
• Placeholder text changes subtly by time of day:
• Morning: “what did you work on?”
• Afternoon: “what are you in the middle of?”
• Evening: “what did today contain?”

Press Enter to log.
No buttons. No confirmations.

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Timestamped fragments
• Each entry is stored as a short fragment, not a task
• Show the time softly (not loud or bold)
• Fragments stack vertically, newest on top

Entries should feel like:
• notes
• thoughts
• moments
• evidence of effort

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🧭 Time-as-Texture View (Signature Feature)

Instead of charts or stats, create a “day texture” view:
• Each day is represented as a soft vertical column
• The number of entries affects the density, not the size
• Empty days are shown calmly, not as failures

No numbers.
No labels.
Just visual presence.

This is the app’s signature, and what makes it shareable.

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🗓 Weekly Reflection (Non-Judgmental)

At the end of the week:
• Show all days side by side
• No totals
• No “best day”
• No advice text

Let the user see patterns without being told what they mean.

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💾 Local-First, Private by Design
• Use localStorage
• No accounts
• No sync
• No analytics
• Data lives only in the browser

Include:
• Export all entries as JSON
• Clear all data with a clear confirmation

Privacy is a feature.

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🎨 Visual Language (Important)
• Calm, neutral palette
• Soft motion only (fade, slide, ease)
• Rounded typography
• Gentle spacing
• Light and dark modes

The app should feel:
• quiet
• adult
• respectful
• non-demanding

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🛠 Technical Constraints
• Single HTML file
• Embedded CSS + JS
• No external libraries
• Clean, commented code
• Easy to remix

Include a CONFIG section at the top for:
• App name
• Accent color
• Default theme
• Time-of-day prompts

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📦 Final Output

Deliver:
1. A complete, runnable single-file app
2. A short explanation of the design choices
3. Notes on how someone could extend it without breaking the philosophy

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🧪 Design Philosophy (Do Not Skip)

This app is intentionally incomplete.

It does one thing:

It helps someone remember that they did something today.

Nothing more.