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
ColdTrace: Cold Case Mystery
A phone
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
4,953 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 included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 ColdTrace: Cold Case Mystery: map the core Entertainment 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
Regularly update with fresh cases to keep users engaged.
Assumption to check: Limited case selection may frustrate users.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce dynamic clues based on user interactions.
Assumption to check: Clue finding can be tedious and repetitive.
Validate with people who use this workflow before building.
Hypothesis 3
Streamline UI and enhance user experience through intuitive design.
Assumption to check: User interface may appear cluttered to some.
Validate with people who use this workflow before building.
Hypothesis 4
Enable users to share cases on social media to increase engagement.
Assumption to check: Lack of social sharing options for cases.
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
A phone. A cold case. The truth is buried somewhere in between. ColdTrace puts you inside a real investigation, or at least, it feels that way. Navigate a stranger's phone, piece together the timeline, and decide: was it really an accident? AN IMMERSIVE FICTIONAL EXPERIENCE • Explore a fully simulated phone interface: messages, photos, notes, voicemails • Uncover a layered narrative where every clue matters • Multiple threads to follow, one truth to uncover FEEL THE TENSION The line between player and investigator blurs. You're not watching the story unfold, you're living it. Every deleted file, every text thread, every timestamp brings you closer to the answer. YOUR INVESTIGATION, YOUR PACE ColdTrace is not a passive experience. What you read, what you dig into, and when, it all shapes your understanding of what happened. For fans of interactive fiction, true crime podcasts, and crime documentaries who want to go deeper. ColdTrace is a fictional narrative experience. All characters and events are entirely invented. Note: Some chapters require a Premium unlock. Some investigations are available for free, while the complete experience can be unlocked through an in-app purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Supabase
Zustand
Axios
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.
