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
Practice Lock | Combination
Unlocking rotary combinations can become second nature with ample practice! Whether you're preparing for school lockers or a safe, Lock Practice brings you a hands-on simulation to master the twists and turns right on...
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
3,558 ratings · Top 15%
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 included14 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 Practice Lock | Combination: map the core Education 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
Include a feature to generate random combinations or user submissions.
Assumption to check: Limited variety of combinations to practice
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to share their progress on social media.
Assumption to check: No progress sharing option
Validate with people who use this workflow before building.
Hypothesis 3
Integrate a user feedback system for improvement suggestions.
Assumption to check: Lack of user feedback on combinations
Validate with people who use this workflow before building.
Hypothesis 4
Add levels or achievements to motivate users.
Assumption to check: No gamification elements
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
Unlocking rotary combinations can become second nature with ample practice! Whether you're preparing for school lockers or a safe, Lock Practice brings you a hands-on simulation to master the twists and turns right on your screen. Customize configurations, race against a timer, and become adept at cracking combos! PRACTICE MAKES PERFECT Experience realistic unlocking with the in-app rotary combination lock. The digital dial behaves just like a real one. Rotate to enter your combination, then tap or swipe up to unlock. Made a mistake? Just keep spinning to reset and try again. TIMER CHALLENGE Test your unlocking speed with our Timer Challenge! Set your desired time and try to crack the combo before time runs out. It adds a fun and competitive edge to your practice! GUIDED ASSISTANCE Encounter a common hiccup? Our app will provide helpful hints to correct common mistakes like missing a crucial rotation before entering the next number. STEP-BY-STEP WALKTHROUGH Enable Walkthrough Mode for a guided experience. The step-by-step instructions will assist you through the process, ensuring you grasp the mechanics of unlocking a rotary combination. CUSTOMIZABLE COMBOS Exercise your skills with various configurations. Select from two number ranges: 0-39 or 0-49, generate random combinations, or input a custom combo to practice a specific sequence. VIBRANT DIAL COLORS Make your practice engaging with six lively dial colors: red, yellow, green, blue, purple, or black. Choose one that suits your style! PRACTICE ANYTIME, ANYWHERE Whether you're gearing up for the new school year or just honing your lock-picking skills, Lock Practice is your go-to app to learn and master rotary combination locks wherever you are! With Lock Practice, turning the dial towards unlocking success has never been more engaging and enjoyable!
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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
React Navigation
Supabase
Zustand
Expo Notifications
BUILD KIT DIFFICULTY
Starter
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.
