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
NightCap Camera: Long Exposure
Photograph star trails or stunning smooth waterfalls
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
2,953 ratings · Top 30%
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 included17 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 NightCap Camera: Long Exposure: map the core Photo & Video 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
Enhance editing options with advanced tools like AI background removal and batch editing.
Assumption to check: Limited editing features compared to professional apps.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize performance for older iOS devices to improve stability.
Assumption to check: Occasional crashes on older devices.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the paywall process and clearly display premium features.
Assumption to check: In-app purchases can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Streamline design for a more user-friendly interface.
Assumption to check: User interface can feel cluttered.
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
Photograph star trails or stunning smooth waterfalls. Capture a meteor mid-streak or traffic with light trails. And clear, detailed photos where there’s barely any light at all. One-time purchase, no subscription. ASTROPHOTOGRAPHY Four modes that automatically set the camera up for you. - Star Trails: watch the stars draw circles overhead - Meteors: automatic capture of shooting stars - ISS: the International Space Station passing over - Stars: starry skies and the Milky Way - New in version 10: Aurora, a time-lapse mode for the Northern and Southern Lights LONG EXPOSURE Hold the shutter open for seconds or minutes and movement becomes light. - Long Exposure: motion blur, or a cleaner shot when you hold still - Light Trails: traffic at night, fireworks, light painting - Both as time-lapse too, up to 4K with adjustable speed LOW LIGHT - ISO Boost for up to 4x beyond the standard camera range - Light Boost - Noise Reduction - Night Mode video and timelapse HANDHELD New in version 10. NightCap steadies and aligns every frame as you shoot, so long exposures no longer need a tripod. MANUAL CONTROL - Swipe to adjust exposure, ISO, focus and white balance - Camera Control on iPhone 16 and later - Zoom to 16x - Black and white mode Also includes an interval programmer, self-timer, and an Apple Watch app with live preview and remote control.
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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
Advanced
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.
