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.
Rafter Tools+ for iPhone-iPad is a rafter calculator for complex roof framing angles that other roof framing calculators don't offer
$7.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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.
JavaScript is required to complete mailbox verification.
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Rafter Tools+: map the core Business workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Affiliate link: CloneChart may earn a commission at no extra cost
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
Assumption to check: Poor user reviews regarding functionality and bugs.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited features compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface is not very appealing.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: High price for limited functionality.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Rafter Tools+ for iPhone-iPad is a rafter calculator for complex roof framing angles that other roof framing calculators don't offer. Calculating common rafters with a construction calculator is fairly easy, but to be a master carpenter you need more roof framing angle information then the construction calculators offers. With the Rafter Tools-Plus app, you'll be able to calculate all of the complex angles for roof framing. The calculator displays the hip rafter plumb line shift dimensions to precisely layout hip rafters for equal pitched or irregular hip roofs with any eave angle (0° - 180°). Calculate and layout the witches cut precisely with Rafter Tools-Plus (Square Tail Fascia) using the hip rafter plumb line shift dimensions. Display the hip rafter roof framing angles with easy to use Framing Square Usage. Calculates the lengths of common rafters, jack rafters, and hip rafters. With ridge and hip rafter width deductions. Use it to calculate Pentagonal, Hexagonal or Octagonal Roofs. Timber Framing Angles calculated from Bartok, Hawkindale, Martindale and McKibben-Gray Hip-Valley Roof Ratios Angle Formulas. Timber Framing Angles definition are just a click away in the app. Standard Rake Walls and Hip Rake Walls rotated into the roof surface plane. Devers-Canted Hip Rafters, Purlin Rafters Round Tower Framing, Octagonal Framing, Bay Window Framing
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.