Calculator vs Flex Calculators
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator
This utility app allows users to perform calculations and view the formulas used. It offers the ability to edit past calculations and share results via email or memos. An optional purchase can remove advertisements.
- View calculation formulas
- Edit past formulas
- Share calculations
- Ad-free option via purchase
- Output to memos or email
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This is a calculator. You can see the formula. You can edit formulas later. To edit a formula, tap the place you want to edit. Purchasing an option allows you to turn off advertisements. Since there is a sharing function, you can output calculation formulas and results to memos or send them by e-mail.
Flex Calculators
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Flex Calculators is a powerful all-in-one calculator app built for everyday problems and advanced math. Use it as your daily calculator, then switch to specialized tools for equations, calculus, statistics, finance, time, and conversions. Key features: - Scientific calculator - Fast expression input and real-time result preview - History support for quick reuse - Configurable angle mode (degrees/radians) - Real-only or complex result handling - Advanced math tools - Equation solver - System of equations and system of inequalities - Matrix calculator - Vector calculator - Derivatives and integrals - Statistics and distributions - Value table and proportion tools - Number base converter - Unit converter - Convert across many categories including: length, mass, area, volume, temperature, time, speed, force, pressure, energy, power, electrical, light, sound, data, performance, chemistry, and biology - Daily life calculators - Currency converter - Energy/fuel cost calculator - BMI/body index calculator - Loan payment calculator - Savings calculator - Date calculator - World hour/time-zone tool - Personalization and display controls - Light, dark, or system theme - Custom theme color - Multi-language interface - Decimal precision setting - Number formatting options (including thousand separators) - Ads and purchase - Banner/interstitial ads may be shown - One-time purchase option to remove ads Why users choose Flex Calculators: - One app for both basic and advanced calculations - Clean workflow for study, engineering, and daily finance tasks - Practical tools that reduce the need to install multiple calculator apps Whether you need quick arithmetic, equation solving, conversions, or planning daily expenses, Flex Calculators helps you solve it faster.
Screenshots
Verdict
The clearest difference is ads: Flex Calculators at none against Calculator's shown. Flex Calculators also leads on update cadence (every 10 days vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Calculator sells 1 one-off in-app purchase and Flex Calculators sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Calculator ships an update every 2 months, Flex Calculators every 10 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.
| Parameter | Calculator | Flex Calculators |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (10 ratings) — better | — |
| Positive reviews | 42.9% of reviews | — |
| Number of ratings | 10 — better | — |
| Update frequency | Every 2 months | Every 10 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 4 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Hideki Ogawa | An Le |
In-app purchases
Calculator
- Remove in-app ads$2.99
Flex Calculators
- Remove Ads$4.99
Questions
Is Calculator free?
Is Flex Calculators free?
Do Calculator or Flex Calculators have ads?
Which is updated more often, Calculator or Flex Calculators?
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