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
Night Filter
Nightfilter is a fast, discreet night mode for your iPhone — perfect for hunters, wildlife
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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 included16 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 Night Filter: 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
Offer customizable filters and effects.
Assumption to check: Limited filter options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a history feature for quick access.
Assumption to check: No history or favorite filters feature
Validate with people who use this workflow before building.
Hypothesis 3
Include tutorials or explanations of filter effects.
Assumption to check: Lack of user education on filter benefits
Validate with people who use this workflow before building.
Hypothesis 4
Add a one-tap reset or undo feature.
Assumption to check: No easy way to revert filters
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
Nightfilter is a fast, discreet night mode for your iPhone — perfect for hunters, wildlife observers, detectives, astronomy fans, or just for fun. - Big toggle: on/off with a tap (via Shortcuts, x‑callback return) - Shake‑off: shake the device to instantly disable - Optional auto‑mute: set media volume to 0 on activation, restore on exit - Setup wizard: one‑tap import of the NightFilter shortcut, clear guidance - Tips: Focus/Do Not Disturb, Reduce White Point, side button triple‑click - Legal: EULA/Privacy inside the app, mandatory first‑launch consent - Privacy: no tracking, no data sharing; settings stored locally Notes: - System‑wide color filters are controlled by iOS. The app triggers your Shortcuts and returns automatically. - For maximum silence also use the hardware mute switch / Focus. Support/Links (for App Store Connect): - Privacy Policy: https://bewerbdich.online/datenschutz.html - Marketing/Home page: http://www.european-foot-reflexology.com - EULA: Apple Standard Terms of Use
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
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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.
