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
Master Bender Gold
Master Bender Gold is the industry's leading and most precise conduit bending app for iPhone and iPad.
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
434 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.
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 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 Master Bender Gold: map the core Productivity 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
Incorporate advanced features like task dependencies and collaboration.
Assumption to check: Limited task management features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a cleaner, more organized layout with better visual hierarchy.
Assumption to check: Cluttered user interface
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize themes, notifications, and task views.
Assumption to check: Not enough customization options
Validate with people who use this workflow before building.
Hypothesis 4
Introduce tiered pricing or one-time purchase options for features.
Assumption to check: High subscription cost for premium features
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
Master Bender Gold is the industry's leading and most precise conduit bending app for iPhone and iPad. Master Bender Gold is a conduit bending calculator for electricians. Master Bender Gold can also be used by plumbers and pipe fitters, who can enter their own tools into program. Master Bender Gold aids you in bending conduit raceways. It takes the math out of bending and allows you to concentrate on the task at hand. Master Bender Gold uses a more precise conduit bending algorithm than the cosecant method that is commonly used in the industry. This gives you more accurate bends with less waste. Master Bender Gold supports the following types of bends: * offset bends and rolling offset bends * three and four point saddle bends * stub 90° bends * parallel bends * segment bends * compound 90° bends Master Bender Gold contains information about: * gain & take-up * conduit layout * conduit weight & sizes * trig functions * fractions * bender methods * safety Master Bender Gold can bend and calculate most all types of conduit bends used today by electricians. Master Bender Gold supports numerous popular bending tools. Master Bender Gold supports hand benders, electric bender ie. sidewinder, 555, triple nickel, and hydraulic bending tools. Have a tool that is not supported? No problem! Master Bender Gold can work with any bending tool. Just tell Master Bender Gold the bending radius for your tool and you are ready to bend. Master Bender Gold computes bends using both feet/inches and metric measurements. Master Bender Gold makes it easy to bend pipes and conduit raceways regardless of whether you are a seasoned professional, studying to be in the electrical, electronic, engineering, plumbing, pipe fitting professions, or an hobbyist who needs to bend a few pipes. If you like Master Bender Gold, you may want to take a look at our other app: Master Electrician Reference™ (MER™). It includes a 29 page conduit bending manual. We also have a free version: MER™ Lite. More information is available at MasterSparky.com.
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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
react-native-paper
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.
