CalcFormula vs CalcFlex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CalcFormula
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CalcFormula is a formula calculator designed for study and work. It helps you save frequently used expressions, reuse them anytime, and reduce repetitive typing and recalculation. Create and manage your own formula entries, then input variable values to get results instantly. For complex expressions, CalcFormula provides clear formula display and editing so you can verify structure and avoid input mistakes. Whether you are reviewing for school, doing engineering conversions, making financial estimates, or handling daily repeated calculations, CalcFormula helps you build a reusable personal formula library. Key Features: Formula Management: Create, edit, and delete formulas in one place Variable Input: Enter parameter values and calculate in real time Formula Display: Readable rendered formula preview Common Formula Library: Built-in references for quick access Local Data: Your formulas are stored locally on your device
CalcFlex
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Discover CalcFlex: Flexible, Free and Ad-Free Calculator App! Unlock the full potential of your calculations with CalcFlex, the flexible calculator app designed to cater to all your needs. Whether you're dealing with complex equations, unit conversions, financial calculations, or scientific formulas, CalcFlex has got you covered. Key Features: Multiple Calculators in Parallel: Seamlessly switch between different calculators for efficiency. Built-in Tools: Access unit converters, finance calculators, math and physics equations all in one app. Custom Equations: Create, save, and reuse your own equations with specific variables tailored to your needs. User-Friendly Design: Start with the familiar calculator layout, free to customize based on preference. Completely Free: No ads, no hidden fees, just pure calculating power. Download CalcFlex now and experience the freedom of a truly flexible and comprehensive calculator app!
Screenshots
Verdict
The clearest difference is iOS requirement: CalcFlex at 17.0 against CalcFormula's 26.0. On price, ads, in-app purchases and device support 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. CalcFormula sells 1 one-off in-app purchase and CalcFlex sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
| Parameter | CalcFormula | CalcFlex |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 9 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | 仲达 夏 | Daniel Chiu Loong Ng |
In-app purchases
CalcFormula
- CalcFormula PRO$0.99
CalcFlex
- +3 New Variables2 variants$1.99
- +20 New Equation Slots2 variants$1.99
- +1 New Calculator2 variants$3.99









