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
Fillwords: Word Search Puzzles
Fillwords is an exciting word game with 2000+ levels!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
59,707 ratings · Top 5%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
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 Fillwords: Word Search Puzzles: map the core Games 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
Introduce new game modes and challenges to keep users engaged.
Assumption to check: Repetitive gameplay can become boring.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the payment process and provide clear information on benefits.
Assumption to check: In-app purchases can be confusing.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more user-friendly ad experience or offer a premium ad-free version.
Assumption to check: Ads can disrupt gameplay.
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing and multiplayer options to enhance user interaction.
Assumption to check: Limited social features.
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
Fillwords is an exciting word game with 2000+ levels! The goal of the puzzle is simple: find hidden words on the game grid. Connect letters with a line to form words and complete each level. Ready to challenge your mind and vocabulary? A GREAT WORD GAME FOR EVERYONE Fillwords suits both beginners and fans of all kinds of word puzzles. Want to relax after a long day? Looking to boost your focus and attention? Or maybe you’re a devoted word search fan? Then this game is the perfect choice for you! WHY DO SO MANY PLAYERS CHOOSE FILLWORDS? - A huge collection of puzzles: Thousands of carefully designed levels are waiting for you! Start with easy tasks and gradually move on to challenging word puzzles that will test even experienced players. - A great brain workout: This game is a perfect way to improve concentration, vocabulary, and thinking speed – all in a fun and engaging format! - A word game for adults: Fillwords was specially designed for adult players, with difficulty and themes picked to keep it truly interesting. - Easy to start, impossible to stop: Every level is available to all players right away. Dive in and enjoy creating words from letters! JOIN THE WORD GAME TODAY Connect letters in any direction to find words. This puzzle will truly put your mind to the test! Play daily, search for words, and enjoy the exciting gameplay. No internet connection? No problem! You can play Fillwords offline – on the go, in traffic, or while waiting in line. There’s always a new puzzle ready for you! Form words from letters and dive into the wonderful world of word diversity. As a nice bonus, the game fully supports 9 languages: English, French, German, Indonesian, Portuguese, Russian, Spanish, Turkish, and Ukrainian. WHAT ARE YOU WAITING FOR? Fillwords has everything for a fun and captivating word game experience. Search for hidden words and challenge your intellect – training your brain has never been so easy and enjoyable! Find hidden words offline and join this exciting word puzzle for adults today! See you in the game!
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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
Zustand
React Navigation
Firebase
Lottie
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.
