Comparison

cFormula vs Hours & Decimals

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

cFormula

Features
Read full description

Customize formulas and calculate at any time. I want to calculate using formulas, but most apps have built-in formulas. There are countless formulas in the world, and it is not easy to find the formula you need to use. Now you can create your own formula within 1 minute. Just 3 steps: 1. Take a photo or select a formula image in the album. 2. Add variables. 3. Enter an expression containing variables. The formula creation is completed, and the calculation is completed instantly by inputting the numerical value of the variable. 【 Main functions 】 ——Take pictures and crop them. ——Select an image and crop it. ——Set formula variables, support uppercase and lowercase letters in English and Latin, and support subscripts. ——A dedicated keyboard for expression input, simple and easy to use. ——Check the expression and prompt for incorrect positions. ——Number specific keyboard, clear and easy to use. ——Supports angle or radian calculation settings. ——Supports calculations such as arithmetic, exponent (power), root, trigonometric function, logarithm, etc. ——Support Scientific notation and factorial calculation. ——Supports constant inputs such as e and π. ——ICloud cloud synchronization creates formulas that are shared across multiple devices and can be used anytime. ——Support restoring after deletion. The deleted formula will be permanently deleted after 30 days. Tip: 1. The simplest formula is to have no images, no variables, and only expressions. You can use it to calculate mathematical formulas with fractions and multiple parentheses. Can be used all at once, next time clear the expression and input a new one. 2. The image of the formula is used to compare the input variable values during use. You can take photos of formulas on books, computer screens, or handwrite them. You can also use other software to edit screenshots of formulas. 3. The dedicated keyboard for expression input is for convenience and ease of use. You can also paste functions that the keyboard does not support in the expression input box, which may bring surprises.

About

Hours & Decimals

Read full description

Hours & Decimals is a simple tool for calculating, converting and checking durations in everyday use. Quickly convert hours to decimal hours and decimal hours to hours/minutes. For example, 8h45 becomes 8.75. MAIN FEATURES * Hours ↔ decimal hours conversion * Calculate the duration between two times * Convert to days * Combine multiple calculations in a single session * Calculation history * CSV export PRIVACY * No ads * No advertising tracking * No personal data collected * All data stays on your device

Screenshots

cFormula4 screens
Hours & Decimals4 screens

Verdict

The call

The clearest difference is in-app purchases: Hours & Decimals at none against cFormula's 1. Hours & Decimals also leads on ads (none vs shown) and update cadence (every 5 days vs every 5 months). cFormula's advantage is iOS requirement (13.0 vs 17). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. cFormula sells 1 one-off in-app purchase. Hours & Decimals asks for nothing beyond the download.

UpkeepUpdate frequency

cFormula ships an update every 5 months, Hours & Decimals every 5 days. The most recent releases landed on October 10, 2026 and October 13, 2026 respectively.

Scorecard4 real differences · 2 level
cFormula versus Hours & Decimals: the parameters behind the verdict, then further details
ParametercFormulaHours & Decimals
PriceFreeFree
Update frequencyEvery 5 monthsEvery 5 days — better
AdsYesNo — better
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17
Further details — not scored
Size13 MB7 MB
Age rating4+4+
Developer疆 边RAPHAEL GAUTHIER

In-app purchases

1 purchases

cFormula

One-time1
  • Fully unlock app$1.99
None

Hours & Decimals

No in-app purchases

Questions

Is cFormula free?
cFormula is free to download, with in-app purchases available.
Is Hours & Decimals free?
Hours & Decimals is free to download, with no in-app purchases.
Do cFormula or Hours & Decimals have ads?
cFormula shows ads; Hours & Decimals does not.
Which is updated more often, cFormula or Hours & Decimals?
cFormula ships an update every 5 months, and Hours & Decimals every 5 days. Most recently, cFormula was updated on October 10, 2026 and Hours & Decimals on October 13, 2026.

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