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
Electrocalc: electronics tools
Introducing the ultimate electronic engineering app! With its comprehensive collection of calculators and design tools, you'll be able to tackle any electronic project with ease
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
3 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.
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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Add to a Remix
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 included15 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 Electrocalc: electronics tools: map the core Productivity 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
Expand types of calculations and add tutorials.
Assumption to check: Limited calculation options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and enhance user onboarding.
Assumption to check: User interface can be overwhelming
Validate with people who use this workflow before building.
Hypothesis 3
Add forums or discussion boards for users.
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance and reduce loading times.
Assumption to check: Inconsistent performance on older devices
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
Introducing the ultimate electronic engineering app! With its comprehensive collection of calculators and design tools, you'll be able to tackle any electronic project with ease. Our app features a filter design calculator that allows you to plot graphs, making it easier to visualize your calculations. Additionally, we've included resistor, transistor, capacitor, amplifier, and inductor design tools to help you tackle any electronic design problem. Whether you're a professional electronic engineer or just starting out, this app is the perfect tool to have in your arsenal. Download now and experience the power of electronic engineering in the palm of your hand! Here are some stuffs you can do with the app:- Circuit design Electrical calculations Filter design Resistor calculations Transistor design Capacitor design Amplifier design Inductor design Electrical engineering tools Electronic engineering calculator Circuit analysis --- The app contains the following calculators --- • Resistor Colour Code • Resistors in series and parallel • Capacitors in series and parallel • Capacitor charge • Resistor's Y to delta and delta to Y Converter • Resistor's Pi, Tee and bridge Tee attenuator • SMD Resistor Code • Capacitor Code includes polyester and ceramic capacitors • Ohm's Law • Transistor amplifier calculator • Filters Sallen-Key active filter, Butterworth, Chebyshev and Bessel filters • Voltage divider • Resistor Ratio • Skin depth • Decibel to Watt and Watt to decibel converter • Coaxial cable and 2 parallel wires impedance and capacitance calculator • Operational Amplifier eg inverting amplifier, Difference amplifier and Non inverting amplifier • LED series Resistor Calculator • Adjustable voltage regulator • 555 timer Calculator including Astable and monostable timer • Power dissipation • Micro strip trace width and impedance calculator • Inductor Design Tool • Cylinderical wave guide Calculator • Rectangular wave guide Calculator • PCB Trace Width Calculator • Series capacitor, inductor and resistor Resonance • Capacitive Reactance • Inductive Reactance • Power Calculator • Decibel Converter • Crossover calculator • Band pass and Band reject filter design Whether you're a professional engineer or a student learning about electronics, Electronics Calculator Pro is the perfect tool for your circuit design needs. With its comprehensive set of calculator tools and offline functionality, you'll have everything you need to design and analyze your circuits with confidence. Try it out today!
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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
Axios
React Navigation
react-native-paper
react-native-async-storage
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.
