Comparison

Calc Engine vs EasyVEE®

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

EasyVEE®

Features
Read full description

The App provides the healthcare professional with all guidelines to set the required flows for the ongoing respiratory therapy. This can be used as further support to the “Tables of mixtures – FiO₂” referred to the specific PEEP pressures and provided with the Operating Manual of EasyVEE® “JET” flow driver. It is possible to choose between the two possible applications foreseen for the flow driver: - Alternative 1: application for twin high flow flowmeter - Alternative 2: application for single high flow flowmeter 1) APPLICATION FOR TWIN HIGH FLOW FLOWMETER This alternative allows to supply oxygen to the flow driver EasyVEE® through a twin group high flow Oxygen flowmeter (Flowmeter [1a] with end of scale 30 L/min + Flowmeter [1b] with end of scale 15 L/min or 30 L/min), which is connected to the hospital centralized gas distribution plant. You can select the following parameters: - PEEP set value - Total flow of the mixture to be supplied to the patient - FiO₂ value necessary for the ongoing therapy The calculator will show the flow values to be set on the two flowmeters in order to obtain the above parameters. Once the value of PEEP is selected, it is possible to identify the resulting values of the mixture total flow supplied to the patient, with the related FiO₂, simply by inserting the two Oxygen flow values set for the flowmeters. 2) APPLICATION FOR SINGLE HIGH FLOW FLOWMETER This alternative allows to supply oxygen to the flow driver EasyVEE® through a single high flow Oxygen flowmeter (flow range 50 L/min with double scale: 2÷10 L/min e 10÷50 L/min), which is connected to the hospital centralized gas distribution plant. You can select the following parameters: - PEEP set value - Total flow of the mixture to be supplied to the patient - FiO₂ value necessary for the ongoing therapy The calculator will show the flow values, to be set on the flowmeter and on the vernier of the adjustable knob for the ambient air intake, in order to obtain the above parameters. Once the value of PEEP is selected, it is possible to identify the resulting values of the mixture total flow supplied to the patient, with the related FiO₂, simply by inserting the Oxygen flow value set for the flowmeter and the indication on the vernier of the adjustable knob for the ambient air intake. Given two of the below values, the App also provides an easy calculator of the O₂ + Air mixture, allowing the user to obtain the remaining two values: - Flow Mixture O₂ + Air (L/min) - FiO₂ (%) - O₂ Flow (L/min) - Air Flow (L/min)

Screenshots

Calc Engine4 screens
EasyVEE®4 screens

Verdict

The call

The clearest difference is in-app purchases: EasyVEE® at none against Calc Engine's 1. EasyVEE® also leads on iOS requirement (14.0 vs 18). Calc Engine's advantage is update cadence (daily vs every 3 months). On price, ads 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. Calc Engine sells 1 one-off in-app purchase. EasyVEE® asks for nothing beyond the download.

UpkeepUpdate frequency

Calc Engine ships an update daily, EasyVEE® every 3 months. The most recent releases landed on October 28, 2026 and October 27, 2026 respectively.

Scorecard3 real differences · 6 level
Calc Engine versus EasyVEE®: the parameters behind the verdict, then further details
ParameterCalc EngineEasyVEE®
PriceFreeFree
Rating5.0 (5 ratings) — better—
Number of ratings5 — better—
Update frequencyDaily — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree—
DevicesiPhone, iPad, Mac, Apple Watch — betteriPhone, iPad, iPod
Requires iOS1814.0 — better
Further details — not scored
Size17 MB10 MB
Age rating4+4+
DeveloperVersaEdge Software, LLCFLOW-METER S.P.A.

In-app purchases

1 purchases

Calc Engine

One-time1
  • Calc Engine+$9.99
None

EasyVEE®

No in-app purchases

Questions

Is Calc Engine free?
Calc Engine is free to download, with in-app purchases available.
Is EasyVEE® free?
EasyVEE® is free to download, with no in-app purchases.
Do Calc Engine or EasyVEE® have ads?
Neither Calc Engine nor EasyVEE® shows ads.
Which is updated more often, Calc Engine or EasyVEE®?
Calc Engine ships an update daily, and EasyVEE® every 3 months. Most recently, Calc Engine was updated on October 28, 2026 and EasyVEE® on October 27, 2026.

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