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
BZ-Battery
BZ-Battery reads the high-voltage battery in a Toyota bZ4X and shows you what the car keeps to itself, on your phone and on your CarPlay screen.
$14.99
PRICE
$14.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
4 ratings · Top 5%
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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included16 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.
JavaScript is required to complete mailbox verification.
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 BZ-Battery: map the core Utilities workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
< Scroll to see more >
App Store description
BZ-Battery reads the high-voltage battery in a Toyota bZ4X and shows you what the car keeps to itself, on your phone and on your CarPlay screen. You need a Bluetooth LE OBD adapter, plugged into the port under the dash. It is tested with an OBDLink CX; vLinker and Veepeak should work too. The cheapest "ELM327 mini" clones often can't read this car. The adapter is not included. What you get: • Charge, power and current, live • Every cell voltage, with the weakest one marked • All pack temperature sensors • Battery health, as the car itself reports it • Measured pack capacity, tracked over months • The 12 V battery's voltage • Every drive and charge kept, with the energy it used • Five dashboards. Pick the one you like. • CarPlay: charge, power, cells, temperature and 12 V on the car's screen Which cars: Toyota • bZ4X 2026 • bZ4X 2022–2025 • bZ 2026 • bZ4X Touring 2026 • bZ Woodland 2026 • C-HR+ 2026 • C-HR 2026 • bZ4X / Bozhi 4X 2024 (China) Subaru • Solterra 2022–2025 • Solterra 2026 • E-Outback 2026 • Trailseeker 2026 • Uncharted 2026 Lexus • RZ 2023–2025 • RZ 2026 It only reads. The app cannot change a setting, clear a fault, or write anything to the car at all. That is enforced in the app. No account, no ads, no tracking. Your readings, history and settings stay on your phone. What the app does send is anonymous and never identifies you or your car: the car model you picked, a short report of how each connection went, and battery-health figures for a study of how these packs age. You can switch the reports and the study off in Settings. Drive summaries are sent only if you turn that on. No car to hand? There is a demo mode built in, so you can look at every screen before you plug anything in. An independent app. Not made by, affiliated with, or endorsed by Toyota, Subaru or Lexus.
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
Incorporate gamification or achievements for battery health.
Assumption to check: Limited user engagement due to lack of interactive elements
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set custom alerts based on battery status.
Assumption to check: Lack of customization options for users
Validate with people who use this workflow before building.
Hypothesis 3
Implement visualizations for battery usage patterns.
Assumption to check: Static data presentation may lead to disinterest
Validate with people who use this workflow before building.
Hypothesis 4
Support widgets or Siri Shortcuts for quick access to battery info.
Assumption to check: No integration with system features
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 Native
Expo
expo-battery
react-native-chart-kit
TypeScript
Zustand
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.
