Comparison

Calc Engine vs Graduation Countdown

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

Head to head
About

Calc Engine

A highly customizable calculator with advanced features like graphing, equation solving, and unit conversion. Design your own keyboards and functions to streamline your workflow across Apple devices.

Highlights
  • Customizable keyboard layouts
  • User-defined functions and constants
  • Live equation graphing
  • Equation solving
  • Extensive unit conversions
  • Programmer mode (hex, binary, octal)
  • Cross-device syncing
Features
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Calc Engine™ — The Calculator That Fits How You Work Whether you're splitting a dinner bill, plotting an equation, or working through bitwise logic, Calc Engine meets you where you are. It's a beautiful, fully customizable calculator that grows with you — and syncs seamlessly across iPhone, iPad, Mac, and Apple Watch. Make it look and feel like yours • Choose from rich color themes to match your style • Pick the fonts and key shapes that feel right in your hands • A calculator you actually enjoy opening Design keyboards your way • Build your own keyboard pages — drag any key from a curated library onto a 4×5, 5×5, or 6×5 grid • Mix digits, operators, scientific functions, your own constants — anything you reach for often, all in one place • Set a long-press alternate on any key so a single tile handles a primary and secondary action • Name each keyboard, pick its icon, and reorder it alongside the standard pages — your custom keyboards show up right where you'd expect them • Enable or disable any page (built-in or custom) per device Build your personal math library • Define your own functions with up to three parameters — name them whatever makes sense to you • Save the constants you use all the time and insert them with a single tap • Full calculation history, automatically saved — scroll back anytime Powerful math, always within reach • Trig (radians or degrees), logarithms, exponentials, roots, and more — there when you need them, out of the way when you don't • Live results as you type, so you always know where you're headed • Per-function rounding built in — perfect for money, measurements, or anything that needs a clean output Convert between hundreds of units in seconds • Tap a value, then any two units to see the conversion live — miles to km, lb to kg, °F to °C, gal to L, anything you need • 250+ built-in units across 40+ categories: length, mass, volume, temperature, time, speed, angle, energy, power, pressure, electrical, magnetic, optical, radioactivity, data, and more • Favorite the categories you actually use so they sit at the top — synced across your devices automatically • Build your own functions with conversions baked in — define a formula once and reuse it forever See your equations come to life in graphs • Plot equations like x = y² or sin(x) live as you type, right beside the keyboard • Tap any graph to expand into a full-screen view for closer inspection • A dedicated graphing keyboard with x, y, and = keeps everything in one place — no separate app, no separate mode Solve equations as you type • Type x² = 121 or sin(x) = 0.5 and Calc Engine finds every real answer • Tap the solved answers to reuse it in your next calculation, no separate "solve" mode Programmer mode without leaving the calculator • Type hex (0x), binary (0b), and octal (0o) literals — read and write the way you read code • A full bitwise toolkit: AND, OR, XOR, NOT, shifts, and rotates • Every result shown in HEX, DEC, OCT, and BIN simultaneously, with configurable word size (8/16/32/64) and signed/unsigned interpretation • Tap the binary row to expand into a byte-by-byte view with bit-position labels Private by design • Everything syncs through your personal iCloud — nothing stored on our servers • Fully localized and native on every Apple platform Unlock Calc Engine+ for the full experience — custom themes, fonts, key shapes, custom keyboards, user-defined functions, saved constants, unit conversions, live graphing, equation solving, programmer-mode hex/binary/bitwise, and more. Everything that makes Calc Engine truly yours. Teach it your formulas once. Customize it to feel like home. Use it forever.

About

Graduation Countdown

Easily track important upcoming dates like graduations, birthdays, and holidays with customizable widgets and reminders. Personalize your events with custom colors, background photos, and notes. Never miss a special occasion again.

Highlights
  • Home screen widgets
  • Event reminders
  • Repeat events
  • Custom event colors
  • Background photos
  • Event notes
Features
Read full description

Graduation Countdown - 2 Weeks makes it easy to keep track of important dates in your life. You can use Graduation Countdown - 2 Weeks to keep track of graduation, birthdays, vacations, anniversaries, Thanksgiving, Halloween, Christmas, concerts and more. Features: • Add widgets to your home screen. • Schedule reminders to get a notification when the event is coming up. • Repeat events automatically. • Give your event a custom color. • Add a background photo to your event. • Add notes to your event. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ If you have suggestions on how to improve Graduation Countdown - 2 Weeks, feel free to contact the App Support email.

Screenshots

Calc Engine4 screens
Graduation Countdown4 screens

Verdict

The call

The clearest difference is update cadence: Calc Engine at daily against Graduation Countdown's every 8 days. Calc Engine also leads on monetization model (free vs free with in-app purchases) and device support (4 vs 2). On price, rating, ratings volume and ads 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. Calc Engine sells 1 one-off in-app purchase and Graduation Countdown sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Calc Engine against 5.0 for Graduation Countdown. Both are backed by a comparable volume of ratings — 4 and 4 respectively.

UpkeepUpdate frequency

Calc Engine ships an update daily, Graduation Countdown every 8 days. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

Scorecard3 real differences · 6 level
Calc Engine versus Graduation Countdown: the parameters behind the verdict, then further details
ParameterCalc EngineGraduation Countdown
PriceFreeFree
Rating5.0 (4 ratings)5.0 (4 ratings)
Number of ratings44
Update frequencyDaily — betterEvery 8 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, Mac, Apple Watch — betteriPhone, iPad
Requires iOS1817.6 — better
Further details — not scored
Size17 MB22 MB
Age rating4+4+
DeveloperVersaEdge Software, LLCHavard Tryman

Customer experience

Calc Engine

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Graduation Countdown

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Calc Engine

One-time1
  • Calc Engine+$9.99
3 purchases

Graduation Countdown

Subscriptions3
  • Pro3 Days trial$1.997 Days
  • Pro3 Days trial$8.991 Year
  • Pro$8.991 Year

Questions

Is Calc Engine free?
Calc Engine is free to download, with in-app purchases available.
Is Graduation Countdown free?
Graduation Countdown is free to download, with in-app purchases available.
Which has better reviews, Calc Engine or Graduation Countdown?
Calc Engine and Graduation Countdown are both rated 5.0 out of 5 on the App Store, from 4 and 4 ratings respectively.
Do Calc Engine or Graduation Countdown have ads?
Neither Calc Engine nor Graduation Countdown shows ads.
Which is updated more often, Calc Engine or Graduation Countdown?
Calc Engine ships an update daily, and Graduation Countdown every 8 days. Most recently, Calc Engine was updated on October 24, 2026 and Graduation Countdown on October 15, 2026.

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