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
Unit Converter - Best Unit App
This is Units Plus Converter
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
199,565 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 included15 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 Unit Converter - Best Unit App: map the core Travel workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
This is Units Plus Converter SWAP units by pressing button on keypad (lower left) ***Now with LIVE Currency Updates for all major currencies in the world*** Very simple and beautifully designed unit converter with 20 categories and many different units: CONVERT: *Angle *Area *Currency (155 world currencies updated every day.) *Data-computer data (byte, kilobyte, megabyte, etc.) *Data-Network Speed *Energy *Force *Fuel-Mileage *Length *Pants *Power *Pressure *Shoes *Speed *Temperature *Time (days, weeks, hours, etc.) *Tops-Clothing *Torque *Volume (dry and wet) *Weight-mass Currency exchange rates are downloaded once a day when app is opened. Every download uses very small amount of data. Around 1-2kb. Internet connection required. 155 currencies available - This is all world currencies with their respective country flags.
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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
Expand categories and units available for conversion.
Assumption to check: Limited unit categories compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more user-friendly ad experience or subscription model.
Assumption to check: Ads can be disruptive
Validate with people who use this workflow before building.
Hypothesis 3
Add options for users to define decimal precision and unit preferences.
Assumption to check: Lack of advanced settings for precision
Validate with people who use this workflow before building.
Hypothesis 4
Enable sharing of conversion results via social media or messaging apps.
Assumption to check: Limited sharing options for conversions
Validate with people who use this workflow before building.
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
Axios
React Navigation
Redux
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.
