⚡ Circuit Calculator – iOS App Template

Professional Circuit Analysis & Calculator App for iOS • SwiftUI • MVVM • StoreKit 2 • White-label ready

Transform this premium iOS app template into your own branded electrical engineering tool! Circuit Calculator is a comprehensive, production-ready iOS application crafted for electrical engineers, students, hobbyists, and professionals. This white-label template offers a full suite of circuit calculation tools with a beautiful, modern interface built entirely in SwiftUI.

Ideal For

Reselling as your own branded app
Educational institutions
Engineering tool companies
Electronics hobbyist communities
Technical training programs

✨ Key Features

13+ Professional Calculators

Basic Calculators (Free Tier)

Ohm’s Law Calculator — calculate V, I, R, P from any 2 values
Resistor Series/Parallel — combine up to 20 resistors
Voltage Divider — calculate output voltage from divider circuits
LED Resistor Calculator — current-limiting resistor calculation
RC Time Constant — charging/discharging time calculations

Premium Calculators (IAP Unlock)

Loaded Voltage Divider — divider with load resistance
Capacitor Calculator — series/parallel capacitor combinations
Inductor Calculator — series/parallel inductor combinations
Reactance Calculator — capacitive/inductive reactance (X_C / X_L)
Power & Energy Calculator — advanced power calculations
Wire Voltage Drop — voltage drop in wires (AWG 10–30)
LED String Calculator — multiple LEDs in series
E-Series Finder — nearest standard values (E6, E12, E24, E48, E96)

Circuit Builder (Premium)

Interactive Circuit Designer — drag-and-drop circuit creation
Component Library — resistors, capacitors, inductors, sources, ground
Visual Circuit Analysis — real-time circuit validation
Save & Load Circuits — persistent circuit storage
Export Circuits — share your designs easily

Project Management

Unlimited Projects — organize calculations by project
Folder System — custom folders with colors and icons
Calculation History — track all your calculations
Search & Filter — quickly find past calculations
Export to PDF — professional calculation reports

Reference Library

Formula Reference — quick access to key formulas
Component Guides — resistor color codes, capacitor markings
E-Series Tables — standard component value tables
Wire Gauge Charts — AWG resistance and current ratings

Monetization Ready

In-App Purchase Integration — StoreKit 2 implementation
Premium Feature Gating — configurable free/premium features
Restore Purchases — full restoration support
Paywall Screen — beautiful, conversion-optimized paywall

Modern UI/UX

SwiftUI Interface — native iOS 16+ design
Dark Mode Support — automatic light/dark switching
Smooth Animations — polished, professional feel
Responsive Design — works on all iPhone and iPad sizes
Accessibility — VoiceOver + Dynamic Type support

PDF Export — generate professional calculation reports
Image Export — save calculations as images
Text Sharing — copy results to clipboard
Share Sheet Integration — share via any app

Why Choose This Template?

✅ Production-Ready

No Bugs — thoroughly tested and stable
App Store Ready — follows Apple guidelines
Clean Code — well-organized and maintainable
No Dependencies — 100% native iOS frameworks

✅ Easy to Customize

Centralized Configuration — single file (AppConfig.swift)
Comprehensive Documentation — step-by-step reskin manual included
Feature Toggles — enable/disable features with booleans
Theme System — adjust colors quickly

✅ Professional Architecture

MVVM Pattern — clean separation of concerns
SwiftUI — modern declarative UI
CoreData — robust local persistence
Combine — reactive state for smooth UX
StoreKit 2 — latest IAP implementation

✅ Monetization Optimized

Proven IAP Flow — tested purchase funnel
High-Value Premium Features — advanced calculators + circuit builder
Generous Free Tier — attract users and improve conversion
Restore Purchases — complete restoration support

Technical Specifications

Requirements

iOS: 16.0 or later
Xcode: 15.0 or later
Language: Swift 5.9+
UI Framework: SwiftUI
Architecture: MVVM
Persistence: CoreData
IAP: StoreKit 2

Frameworks Used

SwiftUI (UI)
CoreData (Persistence)
StoreKit 2 (In-App Purchases)
Combine (Reactive programming)
PDFKit (PDF generation)
UIKit (Image export)

✅ No External Dependencies

No CocoaPods
No Swift Package Manager
No Carthage
100% Native iOS

What’s Included

Source Code

✅ Complete Xcode project
✅ 60+ Swift files with comprehensive comments
✅ All assets and resources
✅ CoreData model files
✅ Unit test examples

Documentation

✅ RESKIN_MANUAL.md — step-by-step customization guide
✅ INSTALLATION_GUIDE.md — quick start for developers
✅ README.md — project overview
✅ Inline Code Comments — every function documented

Configuration

✅ AppConfig.swift — centralized configuration (400+ lines)
✅ Feature toggles for all calculators
✅ Theme + typography settings
✅ IAP configuration and free-tier limits

Assets

✅ App icon template
✅ Launch screen
✅ SF Symbols integration
✅ Color assets

Target Audience

End Users

Electrical engineering students
Professional engineers
Electronics hobbyists
Makers and DIYers
Technical educators

Buyers (You!)

App resellers
Educational institutions
Engineering companies
Tech startups
Independent developers

Monetization Strategy

Recommended Pricing

Free Download — attract users with the basic calculators
Premium Unlock — $4.99–$9.99 one-time purchase (recommended)
High Value — advanced calculators + Circuit Builder justify the upgrade

What’s Free vs Premium

Free (5 Calculators): Ohm’s Law, Resistor Series/Parallel, Voltage Divider, LED Resistor, RC Time Constant
Premium (8+ Calculators + Features): advanced calculators, Circuit Builder, unlimited projects/history, step-by-step explanations, E-series suggestions, PDF export

️ Customization Options

Easy to Change

✅ App name and branding
✅ Color scheme (entire app theme)
✅ Typography and fonts
✅ Feature availability
✅ Free tier limits
✅ IAP product ID and pricing
✅ Support email and URLs

Moderate Customization

✅ Add/remove calculators
✅ Modify formulas
✅ Adjust UI layouts
✅ Integrate analytics
✅ Add advertisements

Advanced Customization

✅ New calculator types
✅ Cloud sync
✅ User accounts
✅ Multi-language support
✅ Custom export formats

Learning Value

For Developers

Learn SwiftUI best practices
Understand MVVM architecture
Master CoreData integration
Implement StoreKit 2 IAP
PDF generation techniques
State management with Combine

For Students

Real-world app structure
Professional code organization
Testing strategies
UI/UX design patterns

Unique Selling Points

Comprehensive Feature Set — calculators + circuit builder + project system + export
Premium Quality UI — modern design, smooth animations, polished UX
Easy Reskin — single config file + documentation
Monetization Ready — StoreKit 2 + paywall + feature gating
No Dependencies — 100% native Swift and Apple frameworks

Additional Services

Need help? We offer professional services to support your launch.

Custom Graphic Design

Professional app icon design
App Store screenshots
Marketing materials
Promotional graphics
Starting at $99

⚙️ Advanced Customization

Add new features
Integrate third-party services
Custom calculator types
Backend integration
Analytics setup
Hourly rate: $75/hour

App Store Upload Service

Complete App Store submission
Metadata optimization
Screenshot preparation
Review management
One-time fee: $149

Priority Support

Direct email support
Quick response time
Technical guidance
Best practices advice
Monthly: $49

Contact Us
choochai.t@chatstickmarket.com
www.chatstickmarket.com
We typically respond within 24 hours.

License

This is a white-label template for resale. You can:

✅ Rebrand and sell as your own app
✅ Modify and customize freely
✅ Use for commercial purposes
✅ Create unlimited apps from this template

You cannot:

❌ Resell the source code as a template
❌ Share the source code publicly
❌ Remove copyright notices from code comments

Updates & Support

✅ Lifetime access to this version
✅ Comprehensive documentation
✅ Email support for setup questions

Future Updates: may be available separately. Check our website for new versions. Existing customers receive discounts on updates.

⭐ Customer Testimonials

“This template saved me months of development time. The code quality is excellent and the documentation is thorough. Highly recommended!” — App Developer

“I was able to customize and launch my own circuit calculator app in just 2 weeks. The IAP integration worked perfectly out of the box.” — Indie Developer

“The Circuit Builder feature alone is worth the price. Very impressed with the attention to detail.” — Engineering Student

Bonus Features

✅ Step-by-step calculation explanations
✅ Engineering notation formatting (k, M, G, m, μ, n, p)
✅ Input validation and error handling
✅ Undo/redo support in Circuit Builder
✅ Auto-save functionality
✅ Haptic feedback
✅ Accessibility support

Getting Started

Quick Start (5 minutes)

Download and extract the project
Open in Xcode 15+
Change bundle identifier
Build and run

Full Customization (1–2 hours)

Update AppConfig.swift with your branding
Replace app icon and launch screen
Configure IAP product ID
Test all features
Submit to the App Store

Market Opportunity

Electronics Education — expanding online learning
Maker Movement — growing DIY electronics community
Professional Tools — engineers need mobile calculation tools
Student Demand — engineering students need study aids

Low Competition • High Value

Few comprehensive circuit calculator apps
Many existing apps are basic or outdated
Professional users are willing to pay for quality tools

✅ Quality Assurance

✅ All calculations verified
✅ Tested on iPhone and iPad
✅ iOS 16, 17, and 18 compatible
✅ Dark mode fully supported
✅ No memory leaks
✅ Smooth performance
✅ App Store guideline compliant

Success Tips

Customize thoroughly — make it truly yours
Invest in screenshots — strong visuals improve conversion
Highlight premium value — calculators + builder + export
Competitive pricing — test $4.99–$9.99
Ship updates — keep users engaged
Respond to reviews — build trust and community
Market smart — share on engineering forums & communities

❓ Pre-Sale Questions?

Have questions before purchasing? We’re here to help.
choochai.t@chatstickmarket.com

Why Buy From Us?

✅ Professional, maintainable codebase
✅ Comprehensive documentation
✅ Responsive support
✅ Fair pricing and strong value
✅ Regular updates and improvements

Special Launch Offer

Limited-time bonus for the first 50 buyers:

✅ Free app icon design ($99 value)
✅ 30-day priority email support ($49 value)
✅ App Store submission checklist
✅ Marketing tips guide

Purchase Now

Ready to launch your own circuit calculator app? Get started today and publish within weeks.

Contact & Support
choochai.t@chatstickmarket.com
www.chatstickmarket.com
⏰ Response Time: Within 24 hours

Circuit Calculator — Transform this premium template into your own branded success story!

Circuit Calculator - Professional Circuit Analysis & Calculator App for iOS | StoreKit 2 | Premium