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
DropZone Altimeter Skydive Sim
Master your altitude awareness in style.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 DropZone Altimeter Skydive Sim: map the core Sports 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 sharing options for jump statistics and achievements.
Assumption to check: Lack of user engagement features like social sharing
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their jump profiles with photos and bios.
Assumption to check: Limited customization options for user profiles
Validate with people who use this workflow before building.
Hypothesis 3
Implement local storage to track jumps without internet.
Assumption to check: No offline functionality for data tracking
Validate with people who use this workflow before building.
Hypothesis 4
Enhance data visualization with interactive charts and graphs.
Assumption to check: Poor data visualization for jump stats
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
Master your altitude awareness in style. DropZone Altimeter is the most visually customizable skydiving altimeter simulator on the App Store. Whether you're a student working on altitude awareness or a licensed jumper who wants to visualize your dive plan, DropZone gives you a realistic, configurable altimeter experience with the look and feel that matches your style. CHOOSE YOUR SKIN Switch between multiple altimeter faces — from classic analog dial to modern sport-style and precision instrument designs. Every skin is crafted to feel authentic, readable, and beautiful. Match your rig, match your vibe. BUILT FOR SKYDIVERS Practice altitude awareness the right way. Configure your jump altitude, freefall rate, and canopy phase to simulate the exact profile of your next jump. Whether you're belly flying at 14,000ft or head-down at 18,000ft, the simulator adapts to your discipline. FULLY CONFIGURABLE Set jump altitude in feet or meters Choose fall rate: belly, freefly, head-down Configure up to 4 audible altitude alerts (breakoff, pull, warning, canopy) Custom thresholds per alert — your altimeter, your settings AUDIBLE ALERTS Never miss a critical altitude. Configure audio cues for breakoff (e.g. 5,500ft), pull altitude (e.g. 4,000ft), low altitude warning (e.g. 1,500ft), and canopy descent — all fully adjustable. METRIC & IMPERIAL Full support for both feet and meters, with altimeter faces optimized for each unit system. IMPORTANT: DropZone Altimeter is a training simulator only. It is NOT a certified altimeter and must NEVER be used as a substitute for a real altimeter during an actual jump. Always use certified, calibrated equipment in the air. WHO IS THIS FOR? AFF students building altitude awareness muscle memory Coaches preparing students for altitude-specific exercises Licensed jumpers visualizing new skydiving disciplines Anyone who wants a beautiful, customizable altimeter on their screen Download DropZone Altimeter and experience altitude training with a simulator that looks as good as it performs.
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.
SUGGESTED BUILD STACK
React Native
Expo
zustand
react-navigation
react-native-chart-kit
Firebase
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.
