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
BookTok：Reading Novel & eBook
BookTok — the books you'll be obsessed with, all in one place, completely free
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
245 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 included19 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 BookTok：Reading Novel & eBook: 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
Allow users to customize reading themes and font sizes.
Assumption to check: Limited personalization options for users
Validate with people who use this workflow before building.
Hypothesis 2
Implement regular content updates to keep the library fresh.
Assumption to check: Inconsistent update frequency for content
Validate with people who use this workflow before building.
Hypothesis 3
Provide an ad-free experience with premium subscription.
Assumption to check: Ads interrupt reading experience
Validate with people who use this workflow before building.
Hypothesis 4
Enable better offline reading functionality.
Assumption to check: Limited offline access to downloaded books
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
BookTok — the books you'll be obsessed with, all in one place, completely free. Thousands of novels and web novels are ready for you right now. No limits, no catch — just great stories. We're BookTok, and we built this app for people who genuinely love getting lost in a good story. Our library covers everything: fantasy, martial arts, romance, love stories, urban fiction, campus life, drama, horror, mystery, sci-fi, historical novels, adventure and more. Whether you're in the mood for something that makes your heart race, a world that pulls you in completely, or a page-turner you can't stop thinking about — we've got you covered, totally free. Fresh chapters and new books land every day, so there's always something waiting on your reading list. We also run events, challenges and surprises to keep things interesting. And behind the scenes, we're always tweaking and improving — because we want BookTok to be the app you open every single day. What makes BookTok different: 【A Library That's Actually Fun to Browse】 Thousands of novels sorted into smart lists that actually make sense. Our recommendation engine picks up on what you like and gets sharper the more you read. Browse by genre, mood, trending, editor's picks or let the app surprise you. 【Reading That Feels Like a Real Book】 Realistic page-turning that makes your screen feel like paper. Download chapters and read offline — perfect for commutes, flights, or anywhere with dodgy signal. Tweak the fonts, backgrounds and brightness until it feels just right. Night Mode for when you're reading way past your bedtime. Clean layouts, beautiful covers — we made it look good because you'll be spending a lot of time here. 【Make It Yours】 Pick from a bunch of backgrounds, themes and fonts. One tap and your personal reading mode is ready. Save your favourites, build your own shelf, and get recommendations that actually match what you enjoy. 【Never Lose Your Spot】 Your progress, bookmarks and notes sync automatically across all your devices. Start on your phone, finish on your tablet. Switch devices without skipping a page. About Auto-Renewable Subscriptions • Optional subscriptions are available. You can read completely for free. • Payment: subscription charges will be charged to your iTunes account upon purchase. • Renewal: your subscription will auto-renew. Cancel up to 24 hours before the renewal date. • Cancellation: manage or cancel anytime in your account settings. • Privacy Policy: https://staticpage-en.cdreader.com/RU/AppPrivacyPolicy.html?client_proid=193&mt=1 • Subscription Terms: https://staticpage-en.cdreader.com/RU/CheckinCard/agreement.html?client_proid=193&mt=1 • Terms of Use: https://staticpage-en.cdreader.com/RU/service_term.html?client_proid=193&mt=1 Contact Us Email: [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.
SUGGESTED BUILD STACK
React Navigation
Zustand
Axios
Expo Image
Expo Status Bar
React Native Vector Icons
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.
