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
Lysn
Make your day more special with a message like a gift from your favorite idol!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 2.8
1,051 ratings · Below Average
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Lysn: map the core Social Networking 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
Redesign with a clearer layout and intuitive navigation.
Assumption to check: User interface is cluttered and hard to navigate.
Validate with people who use this workflow before building.
Hypothesis 2
Implement better image compression and loading indicators.
Assumption to check: Slow performance with image uploads and loading times.
Validate with people who use this workflow before building.
Hypothesis 3
Add more interactive features like polls, stories, and live chat.
Assumption to check: Limited features for user engagement and interaction.
Validate with people who use this workflow before building.
Hypothesis 4
Implement a more reliable notification system with real-time updates.
Assumption to check: Inconsistent notifications that may lead to missed messages.
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
Make your day more special with a message like a gift from your favorite idol! Start bubble right now and don't miss out on special private messages between you and your favorite idol! -------------- [Service Overview] 01. Favorite Idol's Everyday Story Receive a special everyday message from the artist who calls your name. 02. Favorite Idol's Dedicated Content See dedicated content sent directly from artists. 03. Your favorite idol is waiting for your reply Reply to the artist with a message filled with encouragement and love. 04. Anniversary with Your Favorite Idol Today is Day 1! See the special anniversary date between you and your artist. 05. Chatting in my language Read the artist's message and send a reply in your language. [Optional Access Authority] * You may still use the app even if you do not allow optional access authority. 01. Photo Gallery Used to send and store photos and videos and to set profile pictures and chatroom background images 02. Camera Used to film and send photos and videos and to set profile pictures and chatroom background images 03. Mic Used to record and send voice messages and videos 04. Notification Receive PUSH notifications [Subscription Products] 01. Lysn benefits - You can select artists to receive bubble messages from according to the number of artist subscription coupons you have purchased. - Receive bubbles sent directly from the artist of your choice. 02. Subscription Prices and Period - Subscribe through iTunes, and the payment amount will be billed to your iTunes account. - Prices may vary depending on the number of artist subscriptions you purchase. Please refer to the bubble purchase website for details. - Subscriptions are monthly and automatically renewed. [bubble Official SNS] - Twitter: https://twitter.com/dearu_bubble - Instagram: https://instagram.com/dearu_bubble [Terms] - Terms of Use: https://api.lysn.com/terms/?msgType=service&locale=en - Privacy Policy: https://api.lysn.com/terms/?msgType=privacyPolicy&locale=en [Information] - Questions/Suggestions: [email protected]
Written user reviews are not shown here. Check current App Store reviews >
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
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Zustand
react-navigation
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BUILD KIT DIFFICULTY
Expert
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.
