App Overview

Liltie — One Song a Day Diary icon

Liltie — One Song a Day Diary

Seongsup Lee · Lifestyle

one-song-a-day music diary, with no ads and no subscription.

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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A product spec, screen plans, and build steps for your coding agent.

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What's included15 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Liltie — One Song a Day Diary: map the core Lifestyle workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Implement social sharing features to connect users.

Assumption to check: Limited user engagement features

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to customize mood emojis and themes.

Assumption to check: Lack of customization options

Validate with people who use this workflow before building.

Hypothesis 3

Add push notifications to remind users to write their song.

Assumption to check: No reminders for daily entries

Validate with people who use this workflow before building.

Hypothesis 4

Implement cloud backup for user entries.

Assumption to check: Limited data backup options

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

one-song-a-day music diary, with no ads and no subscription. Record the song that matched your mood today, a short note, and a mood wave, then look back through the calendar. ■ One song a day, no pressure Search → write a note → pick a mood step. That's all. One record per day means each song you keep is one that truly mattered. ■ Mood waves for the feeling Five steps from calm to intense, visualized as waves. The shape of the day at a glance. ■ Build your own flow Each recorded day becomes a single wave; together they form your personal flow. In the 7-day strip and calendar views, neighboring days share soft color gradients drawn from album artwork, and a gentle animation lets each day's mood resurface. Empty days can fill in with new waves anytime. ■ Monthly analytics A monthly overview of your mood flow, distribution by level, and most-played genre and artist. Open "See more" to browse every record from that month. ■ Natural Apple Music integration Connect Apple Music to search the catalog and quickly pick from songs you recently played. When not connected, iTunes Search provides the same search experience. ■ 30-second previews Preview the song right on the card. The LP gently rotates while the wave flows. ■ Share to Instagram Stories Send a record as a single composed card. Choose between palette (from album artwork), light, or dark backgrounds. ■ iCloud auto-sync No sign-up required. Apple ID-based sync across all your devices. Open a new device and pick up where you left off. ■ Open in external music apps Open any record in Apple Music · Spotify · YouTube Music in a single tap. Privacy • Liltie does not collect, transmit, or share any user data with external servers. All records are stored only on your device and within your own iCloud account. Requirements • iOS 18.0 or later • iPhone · iPad Contact: [email protected]

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

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BUILD KIT DIFFICULTY
Intermediate

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.