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.
App Overview
BTS Official Light Stick Ver.4
This is the mobile app for the BTS Official Light Stick Ver.4.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
47 ratings · Top 30%
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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 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.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for BTS Official Light Stick Ver.4: map the core Entertainment 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 push notifications for upcoming events and reminders.
Assumption to check: Limited event notifications and reminders
Validate with people who use this workflow before building.
Hypothesis 2
Introduce community features like forums or fan polls.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the search functionality for easier merchandise discovery.
Assumption to check: Difficulties in finding merchandise
Validate with people who use this workflow before building.
Hypothesis 4
Provide more detailed descriptions and customer reviews for each item.
Assumption to check: Insufficient details on merchandise
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
This is the mobile app for the BTS Official Light Stick Ver.4. The Light Stick is connected to a variety of features. [Key Features] 1. Connect Light Stick You can connect to the Official Light Stick using Bluetooth. With the Light Stick turned off, press and hold the buttons on the Light Stick handle simultaneously for 2 seconds to enter Bluetooth Mode. (The Light Stick will blink blue.) Turn on Bluetooth on your phone and connect to the Light Stick. 2. Concert Mode You can check information about upcoming concerts and whether pairing is required. Enjoy a variety of Light Stick patterns linked to the stage during concerts. 3. Light Stick Update You can update your Official Light Stick to the latest version. [Precautions When Attending a Concert] - For concerts that do not require pairing, the Light Stick will automatically light up if you turn it on before the concert begins. - For concerts that require pairing, refer to the separate concert guide, register the concert information in the app's [Concert Mode] menu, and then pair with the Light Stick. - Always keep your Light Stick firmware up to date. If an update is required, a separate announcement will be made via official channels. - On-site congestion on the day of the concert may delay the firmware update and pairing speed or cause them to fail. Please complete the firmware update and pairing before coming to the concert venue. - Replace old batteries with new alkaline batteries before using your Light Stick. (three AAA batteries) - Using old batteries without replacing them with new ones may cause the Light Stick to fade, or flash in different colors then go off during the concert. Please prepare extra batteries. - The Light Stick will remain paired during the concert even if the batteries are replaced, and the light effect will continue automatically. [App Access Permissions] The following are required for the app to run smoothly. Select [Allow] when permissions are requested. - Bluetooth : Required to connect and control the Light Stick. - Location : Used as a reference to provide app services, data will not be stored. - Photo : Required to save and load a code image. - Storage : Required to store data necessary for app usage. You can change permissions in [Settings] > [Apps] or [Applications].
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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.
SUGGESTED BUILD STACK
React Native
Expo
Axios
React Navigation
React Query
BUILD KIT DIFFICULTY
Advanced
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.
