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
Ballistic X
Ballistic-X: The Easiest Way to Calculate Shot Groups and Zero Your Rifle!
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.7
145 ratings · Top 50%
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/
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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 Ballistic X: map the core Sports 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
Offer more detailed analytics with customizable reports.
Assumption to check: Limited analytics features compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the subscription process with clear explanations.
Assumption to check: In-app purchase process can be confusing.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a cleaner design with improved navigation.
Assumption to check: User interface feels cluttered.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance tracking algorithms for better accuracy.
Assumption to check: Performance tracking may not be accurate.
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
Ballistic-X: The Easiest Way to Calculate Shot Groups and Zero Your Rifle! Designed by shooters, for shooters, Ballistic-X offers a simple, intuitive interface allowing users to customize their experience through the Options Menu. Whether you prefer MOA/MIL or INCH/CM, the app works seamlessly with any target, including Steel. Key Features: - Included: Gain access to the core functionality of Ballistic-X with a single purchase. No subscriptions required for full access to essential tools! - Sync settings across multiple devices by signing in (optional, not required to use the app). - Offers useful data and labeling options that aid in Load Development. - The ATZ (Adjustment To Zero) feature helps you precisely adjust your turrets to bring your rifle to zero, saving you rounds and time. ATZ works dynamically at any range and supports all turret options. Simple Workflow: - Take an image of your target (within the app or from your library) - Designate reference size via Settings (default is 1") - Mark two points on the target corresponding to the reference (for grid or steel targets) - Input the distance from the target - Select the caliber used - Mark Point of Aim and Impacts - Add overlay, label, crop, and export/share - Adjust your optic according to ATZ Upgrade to the Advanced Toolkit (In-App Purchase): Unlock additional pro-level features with the Advanced Toolkit: Advanced Overlay Display Options: - Mean Radius - Circular Error Probable (CEP) - Radial Standard Deviation (SD) - Vertical SD - Horizontal SD - Mean Windage - Mean Elevation - Impact Selector - Export to CSV for further data analysis Ballistic-X is a community-driven app, committed to providing the best user experience possible, along with unbeatable customer service. Join the Ballistic-X community today and elevate your shooting precision! Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.ballistic-x.com/privacy.html
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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
Axios
D3.js
Firebase
React Navigation
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.
