Comparison

Calculator∫ vs BIG CALCULATOR.

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

Head to head
About

Calculator∫

Perform calculations quickly and accurately with large buttons. Personalize the interface by selecting custom background and text colors. This straightforward utility is designed for intuitive use.

Highlights
  • Large buttons for easy input
  • Accurate calculations
  • Customizable background colors
  • Customizable text colors
  • Intuitive user interface
Features
Read full description

This simple calculator app is designed for ease of use. Quickly and accurately perform calculations with the large buttons. Personalize the calculator by choosing your own colors for the background and text.

About

BIG CALCULATOR.

This utility app offers a straightforward and visually clear calculator experience, ideal for users of all ages. Its large numbers and dark interface enhance readability, while landscape mode support on iPhones and iPads provides added convenience.

Highlights
  • Large numbers for easy viewing
  • Simple and easy-to-see interface
  • Landscape mode support
  • Dark UI for eye comfort
  • Suitable for all ages
Features
Read full description

A calculator you can actually see — and now hear. Big Calculator does four things — add, subtract, multiply and divide — with keys and digits large enough to read and to hit first time. Nothing else is on the screen. It was built for people who find the calculator that came with their phone too small: for cataracts, glaucoma and macular degeneration, and for anyone whose eyes are simply not what they were. BIG WHERE IT COUNTS • Keys that fill the screen, with room between them • A readout in large, heavy type — no thin, faint numbers • Hide the memory keys and every remaining button grows • Long sums stay readable, grouped the way your country writes them • Portrait or landscape, on iPhone and iPad IT READS THE ANSWER OUT LOUD Turn on VoiceOver and Big Calculator speaks each result the moment it is worked out, so you never have to hunt across the screen for the answer. • Every key says what it is — "Add", "Equals", "Memory add" — not "plus sign" • Divide by zero and it says so, in words • Switch the speaking off in Settings if you would rather it stayed quiet Most calculators leave a blind user to explore the screen and guess. This one tells you. THREE LOOKS — PICK WHAT SUITS YOUR EYES • Warm Paper — dark type on a bright, warm background. Easiest to read for most people. • Night — white on black at high contrast, for eyes that find bright screens painful. • Classic — the original look, with bolder type. The whole app repaints the moment you choose, so you see the difference before you commit. A DESK CALCULATOR ON YOUR PHONE • M+, M− and MRC memory keys, where you expect them • AC clears everything, C clears just the entry • A key press you can hear — or silence it in Settings IN YOUR LANGUAGE, WITH YOUR NUMBERS Available in 23 languages. The decimal point and the thousands separator follow your own country's convention, so the number on screen is written the way you write it — 1,234.56 or 1.234,56 or 1 234,56, whichever is yours. NOTHING ELSE No account. No sign-in. No cloud. Nothing to learn. Your sums stay on your phone. Big Calculator is free, supported by a single banner advert at the bottom of the screen. SUBSCRIPTION Big Calculator Plus — an optional auto-renewing subscription, one year in length. No ads, plus a bigger keypad and display with more room for your calculations. Payment is charged to your Apple Account when you confirm the purchase. It renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your Apple Account settings. The price is shown before you confirm. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://developer-yl.github.io/big-calculator/privacy.html

Screenshots

Calculator∫2 screens
BIG CALCULATOR.4 screens

Verdict

The call

The clearest difference is in-app purchases: Calculator∫ at none against BIG CALCULATOR.'s 1. Calculator∫ also leads on ads (none vs shown) and update cadence (weekly vs every 3 weeks). BIG CALCULATOR.'s advantage is review sentiment (100% vs 84%) and ratings volume (70 vs 7). On price, rating 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. BIG CALCULATOR. sells 1 in-app purchase, starting at $2.99 per year. Calculator∫ asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Calculator∫ against 4.6 for BIG CALCULATOR.. That said, the two scores are not equally well evidenced: BIG CALCULATOR. has 70 ratings behind it against 7, so its average is the more settled of the two. Written reviews are what separate them: 84% of Calculator∫'s written reviews are positive against 100% of BIG CALCULATOR.'s.

UpkeepUpdate frequency

Calculator∫ ships an update weekly, BIG CALCULATOR. every 3 weeks. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

Scorecard7 real differences · 3 level
Calculator∫ versus BIG CALCULATOR.: the parameters behind the verdict, then further details
ParameterCalculator∫BIG CALCULATOR.
PriceFreeFree
Rating4.6 (7 ratings)4.6 (70 ratings) — better
Positive reviews83.8% of reviews100.0% of reviews — better
Number of ratings770 — better
Update frequencyWeekly — betterEvery 3 weeks
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS4.3 — better15.0
Further details — not scored
Size1 MB13 MB
Age rating4+4+
Developer7th GearAdysseus

Customer experience

Calculator∫

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews80 reviews
Positive83.8%
Neutral0.0%
Negative16.3%

BIG CALCULATOR.

All ratings65 ratings
Positive86.2%
Neutral9.2%
Negative4.6%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Calculator∫

No in-app purchases

1 purchases

BIG CALCULATOR.

Subscriptions1
  • Big Calculator Plus$2.991 Year

Questions

Is Calculator∫ free?
Calculator∫ is free to download, with no in-app purchases.
Is BIG CALCULATOR. free?
BIG CALCULATOR. is free to download, with in-app purchases available.
Which has better reviews, Calculator∫ or BIG CALCULATOR.?
BIG CALCULATOR. is rated higher. Calculator∫ averages 4.6 out of 5 from 7 ratings, while BIG CALCULATOR. averages 4.6 from 70 ratings.
Do Calculator∫ or BIG CALCULATOR. have ads?
BIG CALCULATOR. shows ads; Calculator∫ does not.
Which is updated more often, Calculator∫ or BIG CALCULATOR.?
Calculator∫ ships an update weekly, and BIG CALCULATOR. every 3 weeks. Most recently, Calculator∫ was updated on November 1, 2026 and BIG CALCULATOR. on November 6, 2026.

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