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
Timewerks Pro Billing
Our original product, Timewerks, has been an App Store favorite for 11 years and has become the beloved time-tracking and billing solution of freelancers, consultants, contractors, lawyers, and salespeople all over the world.
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
161 ratings · Top 15%
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 Timewerks Pro Billing: map the core Business 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
Implement a more intuitive client management system with better filters and search functionality.
Assumption to check: Users report difficulty in managing multiple clients and invoices.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance reporting capabilities with customizable reports and graphs.
Assumption to check: Some users find the reporting features lacking.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize data fetching and rendering for better performance.
Assumption to check: The app can be slow when loading large data sets.
Validate with people who use this workflow before building.
Hypothesis 4
Provide comprehensive guides and customer support features within the app.
Assumption to check: Users mention the need for better support and 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
Our original product, Timewerks, has been an App Store favorite for 11 years and has become the beloved time-tracking and billing solution of freelancers, consultants, contractors, lawyers, and salespeople all over the world. Timewerks Pro makes it easier than ever to bill your customers: send beautiful PDF invoices or estimates with your company logo, all from your iPad, iPhone, or iPod touch. Timewerks Pro includes the following modules: * PDF Invoices and Estimates * Custom Invoice Logo * Built-in data backup and restore You can further enhance Timewerks Pro by purchasing our optional data sync module (via In App Purchase): Sync your data across multiple iOS devices and view reports and enter data on our companion website, mytimewerks. Existing Timewerks user? No problem, you can transfer your data to Timewerks Pro either using Backup and Restore, or Data Sync. See our website for screenshots, video tutorials and our online user manual. Features: * Track multiple projects and clients. * Create, email and print HTML or PDF invoices and work estimates without a computer, complete with your company logo. * Quickly and easily add timesheet hours and capture notes for each project task. * Track and invoice billable items, materials and expenses. * Built-in data backup and restore: back up and restore your data with one tap (without connecting to iTunes). * Sync data with our web-based companion (requires an optional timewerks sync subscription module.) * Accept credit card payments via integration with Credit Card Terminal (sold separately by Inner Fence LLC) * Time your work for each project via a built-in stopwatch (Task Timer). * Customize different rates for different types of tasks or items. * Calculate sales taxes, discounts and support multiple currencies. * Export your data to comma-delimited (CSV) or tab-delimited (TSV) text files via a Wi-Fi connection and a standard web browser. * Enter and view data without a network connection— all records are stored on the device.
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
react-query
react-native-svg
TypeScript
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.
