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
Rosia
Rosia - a link from the novels to your heart, a bridge from the real world to your fantasy dreams.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
3,604 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 included16 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 Rosia: map the core Books 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
Add personalized recommendations and community features.
Assumption to check: Limited book discovery features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement better data persistence with real-time updates.
Assumption to check: Inconsistent data syncing across devices
Validate with people who use this workflow before building.
Hypothesis 3
Include features for sharing book lists and reviews with friends.
Assumption to check: Lack of social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Enhance premium offerings with exclusive content and features.
Assumption to check: Limited subscription benefits
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
Rosia - a link from the novels to your heart, a bridge from the real world to your fantasy dreams. In order to meet the needs of our lovely users and achieve a cost-effective reading of all books, we hereby launched this subscription app. By subscribing to our Prime Membership, you will get the following Prime Exclusive Privileges: 1. You can read all books freely. Rosia, covering novels of a rich variety of genres like Romance, Werewolf, Fantasy, CEO, Mafia, Youth, LGBTQ+, and so on, provides you with a perfect reading experience with its rich content and fluency reading without the interfere of unlocking chapters. 2. You could easily find the 10000+ top and potential novels. We have customized explicit display and intelligence recommendations to help you find your loved book, such as top romance, trending werewolf, fantasy world... We lowered the price of subscriptions but didn't reduce the number of high-quality novels. 3. 400+ weekly new hit stories are available. We will keep updating weekly the new arrival books and the latest chapters without letting you pace and wait a long time in the present books or plots. We also offer exclusive benefits for new users and a free trial for every reader to have a deep dive into our app. Furthermore, you can cancel or change your subscription anytime during the subscription period. Everything you need has been prepared well. Now, it's time to download our app and give your coming reading journey a try! New to Rosia? • Start with exclusive new member perks • Free trial available—try risk-free • Cancel or modify anytime, hassle-free Ready for your next great read? Download Rosia and dive in! 【Auto-Renewal Subscription Details】 Subscription Plans: - Weekly: $9.99 for your first week, then $14.99/week - Annual: $99.99/year How It Works: Your subscription automatically renews and charges your iTunes account 24 hours before your current period ends, ensuring uninterrupted access to all premium features. Managing Your Subscription: To cancel or modify your subscription, go to your iPhone Settings > Apple ID > Subscriptions, then select Rosia. Important: You must cancel at least 24 hours before your subscription period ends to avoid automatic renewal and charges. Legal Information: - Terms of Service: https://terms.words-fly.com/Rosia - Privacy Policy: https://privacy.words-fly.com/Rosia
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
Zustand
Axios
React Navigation
Supabase
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.
