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
SIMKit
集中收納每一張卡的電信商、方案、號碼、到期日與花費。國旗卡面搭配電信商官方圖示，一眼看懂；到期前自動以通知、Telegram 或 Email 提醒，再也不怕忘記續約或漏掉到期。內建掃碼解析 LPA、產生安裝 QR Code、eSIM 與 MCC/MNC 查詢、多幣別資產統計、保號卡自動續期、應用鎖與桌面小工具。出行常備，保號不忘。
$1.00 · In-app purchases
PRICE
$1.00
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
7 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.
Build your own version
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/
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 SIMKit: 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
Add advanced SIM management tools and analytics.
Assumption to check: Limited features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Optimize API calls and caching mechanisms.
Assumption to check: Inconsistent performance
Validate with people who use this workflow before building.
Hypothesis 3
Implement in-app support or help section.
Assumption to check: Lack of user support options
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to set preferences for notifications and themes.
Assumption to check: Limited customization options for users
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
集中收納每一張卡的電信商、方案、號碼、到期日與花費。國旗卡面搭配電信商官方圖示，一眼看懂；到期前自動以通知、Telegram 或 Email 提醒，再也不怕忘記續約或漏掉到期。內建掃碼解析 LPA、產生安裝 QR Code、eSIM 與 MCC/MNC 查詢、多幣別資產統計、保號卡自動續期、應用鎖與桌面小工具。出行常備，保號不忘。
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-navigation/native
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react-native
expo
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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.
