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
Hammer: Truck GPS & Maps
Smarter Trucking Starts Here.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
36,254 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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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 Hammer: Truck GPS & Maps: map the core Navigation 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
Provide downloadable offline maps for better usability.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Implement real-time traffic updates with user feedback.
Assumption to check: Inaccurate traffic data
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the interface with more intuitive navigation.
Assumption to check: Cluttered UI
Validate with people who use this workflow before building.
Hypothesis 4
Enhance support with in-app chat and better FAQs.
Assumption to check: Poor customer support
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
Smarter Trucking Starts Here. Hammer is a powerful GPS navigation app designed specifically for commercial truck drivers. Built by the community at TruckersReport.com, Hammer Truck GPS delivers precision routing, safety-first features, and robust offline map capabilities tailored to the needs of professional drivers. KEY FEATURES - Truck-Specific GPS Navigation - Turn-by-turn directions customized for commercial vehicles - Routing that considers your truck's height, weight, length, axle count, and cargo type - Offline map access keeps you on track without cellular data - Real-time rerouting around traffic, accidents, and road closures - Landscape mode and satellite view for easier readability on the road - Trip Planning Tools for Truckers - Multi-stop route optimization with custom waypoints - Find weigh stations, fuel stops, rest areas, truck stops, parking, and more - Detailed POIs with diesel prices, hours of operation, click-to-call buttons, and amenity listings - Traffic and weather overlays for route efficiency and safety - Safety-First Features - Weigh station alerts - Speed limit notifications - Lane guidance and spoken voice directions - Dark mode for low-light driving conditions COVERAGE AREAS - United States (including Alaska & Hawaii) - Canada - Mexico Whether you're hauling across state lines or navigating complex city routes, Hammer equips you with everything you need to drive smarter, safer, and more efficiently. Developed by TruckersReport.com — the largest online community of professional truck drivers, dedicated to building tools and resources that empower the trucking industry. IMPORTANT: Terms of Use (EULA): https://www.hammerapp.com/legal/eula
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
react-navigation
axios
react-native-maps
expo-location
BUILD KIT DIFFICULTY
Advanced
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.
