Comparison

Calc Engine vs Megatuner Plus

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
Read full description

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

Megatuner Plus

Features
Read full description

Introducing an Advanced PID Controller Tuner for iOS. The Megatunes Plus app makes the tuning of your PI/PID controllers of (generally) noisy & possible interacting process loops easier. Using data from your control loop experiments. Our advanced algorithms analyze the data to help you find the optimal settings for your controller, ensuring optimal performance and stability. Example processes: Chemical processing plants, Power Plants, ship position control, to mention some. Features: * Advanced PI/PID Controller Tuner for generally noisy & possible interacting process loops. * User-friendly interface for simple and efficient data input and analysis * Advanced algorithms for accurate and precise model and controller tuning * Convert your PID controller parameters over 20 different DCS vendor forms. Whether you're an experienced engineer or just starting out, our PI/PID controller tuner app for iOS can help you fine-tune your control loop and improve your process control system. Download now and start optimizing your loops today! Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Calc Engine4 screens
Megatuner Plus4 screens

Verdict

The call

The clearest difference is update cadence: Calc Engine at daily against Megatuner Plus's every 5 weeks. Calc Engine also leads on device support (4 vs 2). Megatuner Plus's advantage is iOS requirement (16.0 vs 18). On price, ads and in-app purchases 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 Megatuner Plus sells 2 in-app purchases, starting at $4.49 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Calc Engine ships an update daily, Megatuner Plus every 5 weeks. The most recent releases landed on August 31, 2026 and September 15, 2026 respectively.

Scorecard3 real differences · 6 level
Calc Engine versus Megatuner Plus: the parameters behind the verdict, then further details
ParameterCalc EngineMegatuner Plus
PriceFreeFree
Rating5.0 (4 ratings) — better—
Number of ratings4 — better—
Update frequencyDaily — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhone, iPad, Mac, Apple Watch — betteriPhone, iPad
Requires iOS1816.0 — better
Further details — not scored
Size17 MB1 MB
Age rating4+17+
DeveloperVersaEdge Software, LLCChrister Dalen

In-app purchases

1 purchases

Calc Engine

One-time1
  • Calc Engine+$9.99
2 purchases

Megatuner Plus

Subscriptions2
  • Megatuner_Mimo Full$4.491 Month
  • Megatuner_Mimo Full$44.901 Year

Questions

Is Calc Engine free?
Calc Engine is free to download, with in-app purchases available.
Is Megatuner Plus free?
Megatuner Plus is free to download, with in-app purchases available.
Do Calc Engine or Megatuner Plus have ads?
Neither Calc Engine nor Megatuner Plus shows ads.
Which is updated more often, Calc Engine or Megatuner Plus?
Calc Engine ships an update daily, and Megatuner Plus every 5 weeks. Most recently, Calc Engine was updated on August 31, 2026 and Megatuner Plus on September 15, 2026.

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