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.
This is for Level-2
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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.
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Combine features and design from your favorite apps.
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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.
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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Bullet Flight L2: 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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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: Lack of detailed help or tutorials for new users
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization options for advanced users
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: High price point may deter casual users
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent performance on older devices
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.
This is for Level-2. There is also the more advanced Level-M (Military) version of this app which adds the ability to calculate an actual BC based on bullet drop, two velocities, or flight time. The ability to calculate bullet stability. Bullet spin drift is added to the computation, and the Coriolis effect (Earth’s rotation) may be factored in. Knight's Armament Bullet Flight is a military-grade ballistic computer that provides quick solutions in the field. BulletFlight does not only output information in table format but rather dynamically gives you the solution you need now to make that shot. Current weather conditions including temperature, pressure, humidity, wind speed, and wind direction can be input, as well as angles to the target as measured by the built-in accelerometer. The app then provides highly detailed solutions out to 3000 meters. Your weapon profile includes your scope MOA/mRad per click, and hence when you provide a range to the target, the app will simply show how many clicks you need to change the scope by for that range and wind speed. Includes radar-measured G7 BC database for VLD bullets that is far more accurate than provided in any other application on any platform. Relying on 'advertised' BCs provided by most bullet makers is a significant source of error. BulletFlight's G7 data is courtesy of Bryan Litz and I recommend his book: http://www.appliedballisticsllc.com/index_files/Book.htm Up to five ballistic coefficients with corresponding velocity thresholds may be used for each profile to enhance accuracy, or use a single G1, G7, or G8 value. Several built-in profiles for the Army's M110 semi-automatic precision rifle, the 14.5 inch SR16 rifle, The 50 BMG M107, .308 M40A3, .308 M24, and the 6.5mm KAC PDW allow you to get started quickly. You may alter these profiles, or add new ones. This app was in combat use by military snipers in Iraq and Afghanistan. Features: Built-in profiles for common military rifles, but easily add more custom profiles. Accurate bullet database with most major brands. 3000 meters range (2000 using simple screen). Fast and accurate ballistic computation using G1, G7, or G8 ballistic coefficients. Easy to use interface yet powerful and full featured. All relevant data on screen all at once. User interface designed to minimize chance of input errors. "Simple Screen" with distance wheel, but also "Full" screen where any exact range may be used. Output in inches, cm, MOA, Mils, and scope clicks. Option for Metric units. In most cases imperial and metric are visible at the same time. Direct input for scopes with either MOA or mRad metric input (such as Schmidt & Bender). Calculates 360 degree wind drift using either degree or O'Clock format input. Wind speed may be specified in either miles-per-hour or meters-per-second. Advanced atmospheric model. Uses GPS to locate nearest weather station and then automatically gets weather data and altitude for ballistic computation. Sight-in weather may be logged and stored for automatic normalization to standard conditions. So you may sight in at any temperature or altitude and later be accurate at any other temperature or altitude. Built-in accelerometer will detect angle for improved accuracy. Built-in mil-dot range calculator. Built-in help screen. --------------------------- Also see my other apps: BulletFlight M BulletFlight L1
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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.