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
Blitzer.de PRO
The best traffic safety app!
$0.49 · In-app purchases
PRICE
$0.49
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
22 ratings · Top 30%
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/
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 Blitzer.de PRO: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
The best traffic safety app! Blitzer.de PRO keeps you informed with live alerts on mobile and fixed hazards, breakdowns, accidents, traffic jams, and more in your vicinity. Join Europe's largest and most well-known traffic community with over 5 million active users, making your car journey safer and more relaxed. ► VARIOUS VIEWS Choose between the simple Classic view, the map view, or the discreet Dark Mode. ►AUTO START & STOP Just get in & drive! Define your own shortcuts, and the app activates & deactivates automatically. ► CARPLAY Everything at a glance on your car display! And audio directly through the car speakers. ► PERSONALIZED Decide for yourself which hazards you want to be alerted of. ► INNOVATIVE NAVIGATION Navigate with swarm intelligence and reach your destination faster. ► MANY AUDIO OPTIONS Voice or beep alerts – via iPhone or car speakers. Additional vibration for motorcyclists. ► STABLE BACKGROUND OPERATION Receive alerts even during phone calls or while using other apps. ADVANTAGES OVERVIEW * Live updates on fixed and mobile hazards * Over 109,000 fixed hazards worldwide * Reliable, accurate, and road-specific alerts, verified by our traffic editorial team * Display of hazard type with allowed maximum speed and distance * Optimized for use in the car: self-explanatory and without distraction from traffic * Easy reporting and confirming of hazards * Personal customer support for questions, suggestions, or issues * No annoying ads SYSTEM REQUIREMENTS * Enabled location services * Internet connection for online updates (flat rate recommended) IN-APP PURCHASE: MOBILE DANGERS Benefit from all the app's features in the first 14 days. After this 14-day trial period, you will continuously receive unlimited updated alerts of fixed hazards worldwide. Secure the full functionality of the app, including lifelong mobile hazard alerts and real-time information on hazards such as breakdowns, traffic jams, accidents, construction sites, and more, with a one-time in-app purchase. No subscription, no additional costs. VISIT US ON THE WEB https://www.blitzer.de/en/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
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
Implement user-generated reports to improve accuracy.
Assumption to check: Users report inaccurate alert locations
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate community feedback for additional locations.
Assumption to check: Limited coverage in rural areas
Validate with people who use this workflow before building.
Hypothesis 3
Add voice alerts for safer navigation.
Assumption to check: Lack of voice navigation
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the UI to clarify benefits of premium features.
Assumption to check: In-app purchases not clear
Validate with people who use this workflow before building.
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 Navigation
Expo Location
React Native Maps
Axios
Zustand
BUILD KIT DIFFICULTY
Expert
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.
