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
CacheToolBox
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$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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.
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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 included18 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 CacheToolBox: map the core Navigation 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
Offer complete offline map access with all features for premium users.
Assumption to check: Limited offline functionality compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate live traffic data for better route planning.
Assumption to check: No real-time traffic updates
Validate with people who use this workflow before building.
Hypothesis 3
Implement a social feature where users can share their experiences.
Assumption to check: Lack of user reviews and community engagement
Validate with people who use this workflow before building.
Hypothesis 4
Add voice-guided navigation to enhance usability.
Assumption to check: No voice navigation
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
********************************************** NEW: Encode plain text into symbol language NEW: Wherigo Reverse solver ********************************************** CacheToolBox is an ideal tool for all ambitious geocachers and hikers. The app offers conversions for the Swissgrid coordinate system in Switzerland and for various WGS84 formats. Furthermore, the typed coordinates or the current location can be displayed on the map. The map needs an internet connection. In addition, the app offers various tools such as ASCII, numbers to letters, text to numbers, rotation, bearing and distance between two coordinates, prime numbers checker, waypoint projection with current position, Roman numerals, temperature units, number systems, Wherigo Reverse solver, tool for Multi-Cache with calculator. The big collection of interactive code tables continues to be an important part of CacheToolBox. Outdoors, you can decode the encrypted messages smartly with the "symbol keyboards" which were displayed in plain text without any Internet connection. CacheToolBox now also offers the opposite way: simple encryption of plain text by keyboard in symbolic characters! There are currently 116 code tables available. In future, more tables and tools will follow in free updates! Summary of all functions of CacheToolBox: current location - coordinates WGS84 DD.DDD° - coordinates WGS84 DD° MM.MMM° - coordinates swissgrid CH1903+ - Indication of altitude - GPS accuracy - show location on map - copy coordinates from current location and insert within the app diff. maps: Swiss Map® and OSM (automatic switching) - Swiss: Swiss Map@ scaling 1:25’000 with the option to show hiking trails - other countries: OSM - resolution of map: low – normal - high coordinates conversion - convert WGS84 DD.DDD° - convert WGS84 DD° MM.MMM’ - convert WGS84 DD° MM’ SS.SSS" - convert swissgrid CH1903+ - coordinates switching N-S and E-W - show location on map - copy/paste coordinates and insert within the app - share current position by mail, message, WhatsApp code-tables - 116 interactive code-tables for decoding symbol characters - symbol keyboards decodes encrypted messages directly to letters - simple encryption of plain text by keyboard in symbolic characters - no internet connection needed - more code-tables will follow in free updates! tools - ASCII - morse code - numbers to letters: 0=A, 1=A, 26=A - letter to numbers: sum, digit sum, alternated, product - rotation: rot5, rot13, rot18, rot47 and shift by hand (caesar) - distance and bearing between two coordinates - prime numbers: check prime numbers, prime factorization, search prime number - waypoint projection: WGS84 with degree or artillery per milles, distance in meter or feet (english) - Roman numerals: convert Roman to arabic or vice versa - temperature units: celsius – kelvin – fahrenheit – rankine - réamur - number systems: binary – decimal – octal – hexadecimal and more - Wherigo Reverse solver - Tool for Multi-Cache with calculator Info - settings - conversion unit length: meter – feet (english) - rate app - legal notice - link to support website languages - English - German - French
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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.
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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.
