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
Shadowrocket
Rule based proxy utility client for iPhone/iPad.
$2.99 · In-app purchases
OVERALL US RANK
#4
Paid · all categories
REVENUE (Est)
$577K/mo
$345K - $809K
RATING
★ 4.5
12,051 ratings · Top 15%
Evidence scope: #4 is the current overall US Paid chart position. 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 included18 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 Shadowrocket: 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
Provide guided onboarding with tooltips and tutorials.
Assumption to check: Complex setup for new users
Validate with people who use this workflow before building.
Hypothesis 2
Allow advanced configurations for rules, such as regex matching.
Assumption to check: Limited customization options for rules
Validate with people who use this workflow before building.
Hypothesis 3
Implement a connection health monitor to alert users.
Assumption to check: Connection stability issues reported by users
Validate with people who use this workflow before building.
Hypothesis 4
Create an in-app help center with FAQs and tips.
Assumption to check: Lack of detailed help documentation
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
Rule based proxy utility client for iPhone/iPad. - Capture all HTTP/HTTPS/TCP traffic from any applications on your device, and redirect to the proxy server. - Record and display HTTP, HTTPS, DNS requests from your iOS devices. - Configure rules using domain match, domain suffix, domain keyword, CIDR IP range, and/or GeoIP lookup. - Measure traffic usage and network speed on WiFi, cellular, direct and proxy connections. - Import rule files from URL or iCloud Drive. - Block ads by domain, user agent rules. - Local DNS Mapping. - Work on cellular networks. - Decrypt HTTPS traffic. - Perform URL rewrite. - Fully IPv6 supports. - Script filter supports. - Multi-level forward proxy. - Support kcptun, cloak, gost, v2ray plugins. - Support DNS over HTTPS, DNS over TLS, DNS over QUIC.
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
axios
react-navigation
react-native-logs
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.
