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
Caldwell Journal
ASTRONOMERS: Use the Caldwell Journal to learn about, locate, & journal all 109 objects from the Caldwell Catalog.
$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 Caldwell Journal: map the core Reference 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 reminder notifications to encourage daily journaling.
Assumption to check: Lack of user engagement features like reminders or prompts
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize fonts, colors, and styles for entries.
Assumption to check: Limited customization options for journal entries
Validate with people who use this workflow before building.
Hypothesis 3
Implement cloud sync and export features for journal entries.
Assumption to check: No data backup or export options
Validate with people who use this workflow before building.
Hypothesis 4
Enable sharing entries on social media or with friends.
Assumption to check: Minimal social sharing capabilities
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
ASTRONOMERS: Use the Caldwell Journal to learn about, locate, & journal all 109 objects from the Caldwell Catalog. For astrophotographers and visual astronomers who are collecting the Caldwell objects. This app will help you learn, locate, and journal all 109 objects from Sir Patrick Moore's Caldwell Catalog. It is a great way to keep an organized record of finding these celestial wonders. FEATURES LEARN: All 109 Caldwell objects are included with brief descriptions and photos. LOCATE: Detailed star maps and right-ascension/declination coordinates included with each object. FILTER: Narrow your search by constellation, difficulty, object type, and visibility in your location. EXPECTATIONS: What you can expect to see using binoculars, and small, medium, & large size telescopes. PHOTO ALBUM: Upload photos from your - sketches, smartphone eyepiece views, astrophoto rig, or smart telescope. FAVORITES: Mark your favorite Caldwell objects. DETAILS: Record date, time, location, equipment used, magnification, and any other pertinent notes. STAT TRACKER: Keeps track of spotted object statistics by constellation, difficulty, object type, & total. COLLAGE GENERATOR: Generate a collage of your captured objects. PRINTABLE LOG: For visual astronomers, use the included printable PDF for sketching views from your eyepiece. Photograph your sketch for safe digital keeping in the app. EXPORTABLE: Export your journal to PDF.
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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
Supabase
React Navigation
Zustand
date-fns
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.
