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
HAMSignal
The solar weather app for HAM radio operators
$3.99 · In-app purchases
PRICE
$3.99
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 HAMSignal: map the core Utilities 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
Incorporate social sharing options or user accounts for personalized experiences.
Assumption to check: Limited user engagement features, leading to low retention.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate push notifications for significant solar events.
Assumption to check: Potentially lacks real-time updates on solar activity.
Validate with people who use this workflow before building.
Hypothesis 3
Provide educational content on frequency usage based on conditions.
Assumption to check: Users may struggle with frequency accuracy without context.
Validate with people who use this workflow before building.
Hypothesis 4
Implement account recovery to ensure access to purchased features.
Assumption to check: No account recovery options for paid 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
The solar weather app for HAM radio operators. Real-time band conditions, push alerts, and propagation tools in one place. **The problem we solve:** You know conditions are good. You're waiting for the bands to open. But most apps only tell you when there's a storm - not when the conditions improve. HAMSignal watches K-index and SFI, and tells you when a band opens from your QTH. --- **Real-Time Solar Data** K-index, SFI, A-index updated every 15 minutes from NOAA. All 8 HF bands rated open/fair/closed. **Band Opening Alerts** Push notifications when conditions *improve*. Not storm warnings - band opening notifications. Set thresholds per band. 4-hour cooldown. Based on your grid square. **27-Day Solar Forecast** NOAA's published 27-day outlook. See predicted SFI and K-index ranges for the next month. Plan ahead. **Grey Zone / Terminator Overlay** The day-night boundary on the solar disk, plus your local sunrise and sunset times. Critical for HF timing. **PSK Reporter Live Data** See which bands are active right now. Real-time spot counts, top contacts, ranked recommendations. **Historical Trends** 7, 14, 30, or 90 days of SFI and K-index history with trend indicators. **Contest Mode** Full-screen glanceable dashboard when you're in a pileup. Large K-index, SFI, A-index, band recommendations - one look. **NOAA Satellite Pass Predictions** Next 5 passes for NOAA-18, 19, and METOP from your location. **QSO Logbook** Log contacts with solar conditions auto-attached. Export to ADIF or Cabrillo for LoTW, eQSL, award submissions. **Apple Watch** K-index and best band at a glance. Complications for all watch faces. --- No account required. No subscription. No ads. Your data stays on your device. SUPPORTS: iOS 17+, watchOS 10+
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
expo-location
expo-clipboard
react-navigation
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.
