Flagship
All-in-One Calculator
Every calculator you'll ever need in a single, beautifully designed app.
Loading…
Loading…
The world's largest calculator ecosystem. Simple everyday calculators. Professional engineering tools. Finance. Health. Education. AI. Developer tools. Everything in one platform.
The Ecosystem
Purpose-built calculators for every part of your life — every one sharing the same clean design, offline-first engine and privacy promise.
Every calculator you'll ever need in a single, beautifully designed app.
Fast, elegant everyday arithmetic. No clutter, no noise.
Advanced math, trigonometry and logarithms with a clean, modern UI.
EMI, interest, tax and investment tools that keep your money math simple.
BMI, BMR, calorie and fitness trackers for your health journey.
Binary, hex, base conversions and utilities built for developers.
Homework helpers for math, physics and chemistry — made friendly.
Constants, conversions and scientific formulas at your fingertips.
Instant crypto conversions, portfolio math and market-aware tools.
Token, cost and model math for AI builders and researchers.
Convert everything — units, currencies, time, speed and more.
Fun tools for photography, cooking, gaming, crafts and more.
Why All-in-One
The best tools feel invisible. We obsess over speed, simplicity and privacy so you can focus on the answer.
Every calculator works without an internet connection. No loading, no waiting — just answers.
Your data stays on your device. No tracking, no data selling, no dark patterns. Ever.
Native-speed engines and instant startup. Built to be faster than a physical calculator.
Most apps work instantly, with zero accounts. Open and calculate — that's it.
A calm, minimal design language inspired by Google Calculator, Apple and Stripe.
The same great experience on Android, web and (soon) desktop — synchronized design.
Available everywhere
AI, On Your Terms
Ask an AI calculator to explain any step, formula or concept — then get answers designed for calculators: short, accurate and always optional.
You: Why is the EMI higher this month?
AI: Your interest rate changed on the 1st. Here's the step-by-step breakdown of the new amortization…
Use your own AI API key (BYOK). Your key, your rules — never stored on our servers.
Optional on-device models for people who want AI without any network call at all.
Prompts go straight to the provider you choose. We never see, store or train on them.
Local inference means AI answers even in airplane mode, on a hike, in a tunnel.
Works with Google AI Edge models on device for fast, private on-device inference.
0
conversations ever read by us. AI stays between you and your provider.
Student Loan EMI Planner
by @finance_simplified · 2.4k installs
Creator Platform
The All-in-One Creator Platform turns users into creators. Design a calculator once — publish it to the marketplace, share it anywhere, and earn reputation with every install.
Build your own calculator with our visual creator — no code required.
Ship it to the marketplace after a quick review. You keep ownership.
Share via link, embed, or let users install it across the ecosystem.
Get verified, climb leaderboards and build a following of users.
Join hundreds of thousands of people who do their everyday math with All-in-One. Free, fast and private.