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
Battery Health - For Tesla
The honest number for your battery.
$3.49 · In-app purchases
PRICE
$3.49
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
34 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
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 Battery Health - For Tesla: map the core Lifestyle 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
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 detailed insights and analytics.
Assumption to check: Limited battery analytics compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set their own alert thresholds.
Assumption to check: Lack of customizable alerts.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more modern and visually appealing design.
Assumption to check: Basic UI design.
Validate with people who use this workflow before building.
Hypothesis 4
Clarify subscription benefits and pricing.
Assumption to check: In-app purchase confusion.
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 honest number for your battery. Real capacity. Range over time. How you compare. Battery Health for Tesla shows you what the official Tesla app doesn't - the actual numbers behind your battery, on a clean dashboard you can check in seconds. THREE VIEWS, ONE STORY YOUR BATTERY TELLS • Health - Real usable capacity in kWh, charge cycles, and a verdict (Excellent, Normal, Below Average) anchored to the warranty thresholds for your model and year. No vague percentage. Just the honest number. • Range - Watch your maximum range plotted from the moment you connect. Pinch the chart to scrub through every reading and see the trend, not just whatever the dash showed yesterday. • Fleet - See where your battery sits against every similar Tesla in the TezLab fleet - same model, same year, same trim. Top of the pack, in the middle, or somewhere else? Find out. SHARE THE NUMBERS Battery health, range trend, or fleet ranking - send any of them to other Tesla drivers in one tap. MONITOR ALL YOUR TESLAS, AUTOMATICALLY Connect more than one vehicle and we'll keep an eye on each one. Readings refresh on their own, in the background, as your car checks in - no syncs, no manual refreshes, no long-running tests. PRIVACY-FIRST BY DESIGN • Battery data only. Your car streams battery updates - and only battery updates - on its own schedule through Tesla Fleet Telemetry. We never poll, wake, or send commands. • Anonymized comparison. Your VIN never shows up in anyone else's view of their own battery. • You own the connection. Sign out from the app any time, or revoke access directly from your Tesla account. BUY IT ONCE, KEEP IT FOREVER No subscriptions. No monthly fees. The same purchase covers your next Tesla too. What's included: • Real usable capacity in kWh • Range over time • Comparison vs. similar Teslas • Charge cycles + verdict • Multi-vehicle monitoring • Share with other drivers SUPPORTED VEHICLES All Model 3, Model Y, and Cybertruck. Model S and Model X from 2021 onward. Pre-2021 Model S/X with MCU2. MCU1 Model S/X are not supported. Requires a Tesla account. ABOUT TEZLAB We make the #1 app for Tesla drivers, and Battery Health is one of our apps. Your percentile comes from anonymized data across our wider TezLab community. Stop guessing about a number that matters.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Supabase
Victory Native
React Navigation
React Native Paper
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.
