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
Mobilis: Novels & Reading Hub
Mobilis — the reading app millions of readers love
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.1
87 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 Mobilis: Novels & Reading Hub: 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
Integrate with more book databases and libraries.
Assumption to check: Limited book selection compared to other apps
Validate with people who use this workflow before building.
Hypothesis 2
Provide clear explanations of premium features upfront.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Optimize search algorithms for faster results.
Assumption to check: Search functionality can be slow
Validate with people who use this workflow before building.
Hypothesis 4
Add features for sharing books on social media platforms.
Assumption to check: Limited social sharing 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
Mobilis — the reading app millions of readers love. Thousands of novels, web novels and e-books are waiting for you free. Read without limits, wherever you are. Our library is updated every day with brand-new chapters and bestselling stories, so you'll always have something exciting to read. Romance, fantasy, billionaire, werewolf, vampire, mafia, adventure, campus, science-fiction — all the genres you love are here, updated daily so there's always something fresh. Whatever your reading mood today — a heart-fluttering romance, an epic fantasy that sweeps you away, or a mystery that keeps you turning pages — you'll find it on Mobilis. Enjoy exclusive events, personalised recommendations and an immersive reading experience designed for true book lovers. 【Extensive Novel Library】 Thousands of popular web novels and e-books across every genre you love — all free to read. Discover editor's picks, bestselling books, personalised recommendations that get smarter the more you read, and carefully curated collections organised by theme and mood. New stories and chapters added every single day — there's always a fresh discovery waiting. 【Premium Reading Experience】 Realistic 3D page-turning effects that feel just like a real book in your hands. Offline reading: download your favourite chapters ahead of time and enjoy them anywhere, even with no internet connection. Adjustable font size, light and dark mode for comfortable reading at any time of day. Multiple customisable reading themes to match your personal style. A smooth, comfortable interface designed for hours of reading without eye strain. Beautifully designed book covers and clean page layouts make every reading session a pleasure. 【Personalised Reading】 Build your own bookshelf and organise your favourites exactly the way you like. Customise fonts, colours, backgrounds, brightness levels and reading modes to create your perfect reading environment. Get daily recommendations that learn what you genuinely enjoy — the more you read, the better they get at finding your next favourite story. 【Smart Synchronisation】 Your reading progress, bookmarks, notes and personal library sync automatically across all your devices in real time. Start a chapter on your phone during your morning commute and continue right where you left off on your tablet at home in the evening. Switch devices anytime without ever losing your place. About Auto-Renewable Subscriptions • Optional subscriptions are available within the app. You can read completely for free. • Payment: Payment will be charged to your iTunes account upon confirmation of purchase. • Renewal: Your subscription will renew automatically unless auto-renew is turned off at least 24 hours before the end of the current billing period. • Cancellation: You can manage or cancel your subscription at any time through your Apple ID account settings. • Privacy Policy: https://web.cdreader.com/fr/appPrivacyPolicy.html?client_proid=204&mt=1 • Subscription Terms and Conditions: https://www.weread.mobi/FR/CheckinCard/agreement.html?client_proid=204&mt=1 • Terms of Service: https://www.weread.mobi/FR/termsofservice.html?client_proid=204&mt=1
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.
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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.
