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
Fahrtenbuch
The first Mileage Log with CarPlay, GPS Tracking, Autostart | Autostop, iCal, Apple Watch, 3D Touch, Today-Widget, iBeacon, iCloud Backup, Touch ID, GoBD Export and Dropbox integration!
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.9
10 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.
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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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 Fahrtenbuch: map the core Business 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
Add more detailed categorization options and comprehensive reporting.
Assumption to check: Limited features for trip categorization and reporting
Validate with people who use this workflow before building.
Hypothesis 2
Implement a modern design with animations and improved UX.
Assumption to check: User interface can feel outdated
Validate with people who use this workflow before building.
Hypothesis 3
Ensure robust data synchronization across devices.
Assumption to check: Sync issues with different devices
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer information about what features are included with each subscription tier.
Assumption to check: Subscription model may confuse users
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
The first Mileage Log with CarPlay, GPS Tracking, Autostart | Autostop, iCal, Apple Watch, 3D Touch, Today-Widget, iBeacon, iCloud Backup, Touch ID, GoBD Export and Dropbox integration! No registration, no recurring fees, no other hardware (OBDII dongle, etc.) needed! Fahrtenbuch, is the #1 choice "drivers log" in germany, essential for anyone who needs to track mileage for tax deduction or reimbursement. There are no rides, routes, addresses, etc. transferred to our servers, your data remains your data! The german word "Fahrtenbuch" stands for the pain in the a** for everyone who needs to track it on paper by hand - but with our app it's fun! With predictive auto-calculation, and quick access to frequent locations, Fahrtenbuch does the hard work for you. Only two taps will create useful data ready to go. iPhone Fahrtenbuch was the first Mileagelog for the iPhone at all, the first version appeared already 2 months after Apple's development environment. Nevertheless, we work hard every day to keep the best Mileagelog for iOS. All updates have been published completely free! Perfect addition to the iPhone logbook: "Fahrtenbuch | Maps" for macOS in the MacAppStore! Export targets: - iCloud - Dropbox - Mail body - Mail attachment - iCal - PDF - Google-Calendar (online) - Google-Docs (spreadsheet, online) Formats: - CSV (comma-, tabulator, semicolon separator) - PDF If you are considering making additional support as a subscription, read Apple's terms and conditions at https://www.apple.com/legal/internet-services/itunes/dev/stdeula/. IMPORTANT... Make regular data backups and transfer the data to a program on your computer We are not liable for loss of recorded data. "Continued use of GPS running in the background can dramatically decrease battery life."
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
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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.
