Fastshot is an AI-powered mobile app builder that generates production-ready native iOS and Android apps from text descriptions. Built on Expo and React Native, it handles design, code generation, backend setup, and App Store deployment — no coding required.

Do I need coding experience to use Fastshot?

No. Fastshot generates complete mobile apps from plain English descriptions. No coding, design, or technical skills are required. Simply describe your app idea and Fastshot builds it.

What kind of apps can Fastshot build?

Fastshot builds native iOS and Android mobile apps across all categories including fitness, social, productivity, business, education, e-commerce, and lifestyle apps. Apps include UI, navigation, backend (Supabase with PostgreSQL), authentication, push notifications, and monetization.

Can I deploy my app to the App Store and Google Play?

Yes. Fastshot compiles APK and AAB files for Google Play and IPA files for the App Store in the cloud. It also generates store metadata, screenshots, and submission documentation for both platforms.

Do I own the source code?

Yes. You get full ownership of the generated React Native and Expo source code. You can export it, modify it in VS Code or any IDE, or hand it to a developer. Zero vendor lock-in.

How is Fastshot different from web app builders like Bolt.new or Lovable?

Bolt.new and Lovable generate web applications that run in a browser. Fastshot generates true native mobile apps using React Native and Expo that compile to iOS and Android binaries with full device API access including camera, GPS, push notifications, and biometrics.

Does it support scientific functions?

Yes. Describe scientific mode and Fastshot generates trigonometric functions, logarithms, exponents, constants, and parenthetical expressions for advanced calculations.

Is there a calculation history?

Absolutely. Fastshot generates a scrollable history where users can review past calculations, tap to reuse results, and clear history when needed.

Can the app convert units?

Include unit conversion in your spec. Fastshot generates converter screens for length, weight, temperature, volume, area, and currency conversions.

Can I customize the look and theme?

Describe themes and Fastshot generates light, dark, and custom accent color options so users can personalize the calculator interface to their taste.

Does the keypad feel responsive on mobile?

Fastshot generates native React Native buttons optimized for touch with haptic feedback support, ensuring the keypad feels as responsive as a physical calculator.

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ByElvira Dzhuraeva

Published: Dec 31, 2025Last updated: Mar 24, 2026

Build a Calculator App
— More Than Just Math

Build a calculator app with scientific functions, unit conversion, calculation history, and custom themes.

UtilityMathCalculatorTools

Why Build a Calculator App?

Calculator apps seem simple but well-designed ones with history, unit conversion, and scientific functions consistently rank in the top utility downloads.

A calculator app needs standard and scientific modes, calculation history, unit conversion, expression editing, and a responsive keypad that feels great to use.

Fastshot generates a native calculator with standard and scientific modes, history, unit conversion, and a polished interface for iOS and Android.

You can build this calculator app using our [AI mobile app builder](/ai-app-builder) — describe what you want and get a working native app in minutes.

Key Features for Your Calculator App

Standard and scientific modes, unit conversion, and calculation history — build a calculator that handles everything from tip splits to trigonometry.

Standard Mode

Clean calculator with basic arithmetic operations and a large, responsive keypad.

Scientific Mode

Advanced functions including trigonometry, logarithms, exponents, and constants.

Calculation History

Scroll through past calculations and tap to reuse previous results.

Unit Converter

Convert between units of length, weight, temperature, volume, and currency.

Expression Editor

Edit and correct expressions before calculating with cursor positioning.

Custom Themes

Choose from light, dark, and accent color themes to personalize the interface.

How to Build a Calculator App with Fastshot

Define Your Calculator Niche

Tell Fastshot what makes your calculator special: scientific functions, unit conversion, tip splitting, currency exchange, or a beautiful minimal design. Describe the keypad and features.

AI Crunches the Numbers

Fastshot generates standard and scientific keypads, calculation history, unit converter screens, and theme options — all natively rendered for responsive touch input.

Run Some Real Calculations

Preview on your phone. Punch in equations, test scientific functions, convert units, and review calculation history to confirm everything computes correctly.

Add Up Downloads

Cloud builds produce your calculator. Publish and give users a polished, capable calculator that replaces their phone's default on iOS and Android.

Frequently Asked Questions

Calculate the Value of Your App

Describe the calculator your users want. Fastshot generates standard and scientific modes, unit conversion, and history — a native utility built to be used daily.

Scientific modeUnit converter

About the Author

Elvira Dzhuraeva

Elvira Dzhuraeva is an expert in AI mobile app development and React Native. A former Senior Product Manager at Google specializing in AI/ML and Generative AI, she is the Founder of Fastshot (YC-backed) and a founding contributor to Kubeflow.

AI Mobile App DevelopmentReact NativeAI Developer ToolsVibecodingAI/ML Ops

View all articles by Elvira Dzhuraeva

Build a Calculator App— More Than Just Math