Comparison

BIG CALCULATOR. vs sanetime

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

Head to head
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

About

sanetime

This app offers an intuitive way to visualize and manage time zones with a unique rotating clock interface. It simplifies understanding global time differences, helping users avoid scheduling confusion and plan international meetings effortlessly.

Highlights
  • Interactive multi-wheel time zone visualization
  • Smart 'tomorrow' and 'yesterday' indicators
  • Haptic feedback for precise time selection
  • Automatic local time and preference saving
  • Global city search for any time zone
  • Light and dark modes
  • Visual time planning for meetings
Features
Read full description

Sanetime reimagines how we view and visualise time across different zones. With its innovative rotating clock interface, understanding and relating to global time zones becomes intuitive and effortless. For all those times you find yourself asking: "What time is it over there tomorrow morning my time?" "Is that today or yesterday your time?" "I will be half an hour late to a Zoom with someone in Ulaanbaatar, will asking them to start later push them outside of their office hours? Sanetime makes global time management simple, beautiful, and dare we say... sane. No more mental math or confusion about "what time is it there?" – just rotate, visualise, and know instantly. Forget complicated time zone schedulers with boring tables and unintuitive charts. Feel the time zones with interactive visuals and the comfort of a familiar clock face design, making it easy to grasp time differences at a glance. Key features: • Interactive multi-wheel design - Rotate concentric wheels to visualise time relationships across up to three different time zones simultaneously • Smart time indicators - Clear "tomorrow" and "yesterday" markers help prevent scheduling confusion across date lines • Haptic feedback - Subtle vibrations as you rotate through hours help you find precise times • Automatic local time - Starts with your current time zone and remembers your preferences • Global city search - Quickly find any major city or time zone with smart search • Light/dark modes - Comfortable viewing any time of day • Visual time planning - Perfect for scheduling international meetings or keeping track of family and friends worldwide Perfect for: • Remote workers coordinating with global team members • Families staying connected across continents • Business professionals managing international clients • Travellers planning calls back home

Screenshots

BIG CALCULATOR.4 screens
sanetime4 screens

Verdict

The call

The clearest difference is in-app purchases: sanetime at none against BIG CALCULATOR.'s 1. sanetime also leads on ads (none vs shown) and rating (5.0 vs 4.6). BIG CALCULATOR.'s advantage is ratings volume (70 vs 1) and update cadence (every 3 weeks vs every 2 months). On price, review sentiment, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. BIG CALCULATOR. sells 1 in-app purchase, starting at $2.99 per year. sanetime asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

sanetime holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: BIG CALCULATOR. has 70 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

BIG CALCULATOR. ships an update every 3 weeks, sanetime every 2 months. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 4 level
BIG CALCULATOR. versus sanetime: the parameters behind the verdict, then further details
ParameterBIG CALCULATOR.sanetime
PriceFreeFree
Rating4.6 (70 ratings)5.0 (1 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings70 — better1
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationAd-supportedFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size13 MB23 MB
Age rating4+4+
DeveloperAdysseusTaogi Limited

Customer experience

BIG CALCULATOR.

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

sanetime

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

BIG CALCULATOR.

Subscriptions1
  • Big Calculator Plus$2.991 Year
None

sanetime

No in-app purchases

Questions

Is BIG CALCULATOR. free?
BIG CALCULATOR. is free to download, with in-app purchases available.
Is sanetime free?
sanetime is free to download, with no in-app purchases.
Which has better reviews, BIG CALCULATOR. or sanetime?
sanetime is rated higher. BIG CALCULATOR. averages 4.6 out of 5 from 70 ratings, while sanetime averages 5.0 from 1 ratings.
Do BIG CALCULATOR. or sanetime have ads?
BIG CALCULATOR. shows ads; sanetime does not.
Which is updated more often, BIG CALCULATOR. or sanetime?
BIG CALCULATOR. ships an update every 3 weeks, and sanetime every 2 months. Most recently, BIG CALCULATOR. was updated on November 6, 2026 and sanetime on October 30, 2026.

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