Comparison

Mininigma vs ChangeUnits2

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

Head to head
About

Mininigma

This app simulates the historical Enigma cipher machine used during WWII. It allows users to encrypt and decrypt messages, generate machine configurations from keywords, and accurately models various Enigma machine types. Interact with other applications through copy/paste functionality.

Highlights
  • Enigma machine simulation
  • Message encryption and decryption
  • Keyword-based configuration generation
  • Multiple Enigma machine types supported
  • Rotor and plugboard configuration
  • Copy/Paste support
Features
Read full description

Mininigma is a complete simulator of an Enigma Machine for your iPhone/iPad/iPod Touch. Basically, Enigma was a cipher machine used by the Germans during World War II for the encryption and decryption of secret messages. It looked like an old typewriter with some extra features. Being fully compatible with the real Enigma means you can also use Mininigma to decode any of the original messages which can be found on Internet. You can also generate a machine configuration based on a keyword or keyphrase. That means you'll only have to share that keyword to send a message!! Mininigma can accurately simulate different types of machines: The Enigma I, M3 and M4, Railway, G-312, or Swiss-K, with some others coming in the future. You can read more about these, as always, on the Wikipedia :) You can actually select between the different machine types and setup them as you would with a real one: choose rotors, configure them, or use a plugboard to switch letters. All at the tip of your finger. Mininigma supports Copy/Paste to allow you to interact with any other application on your device. You can even copy/paste machine configurations in an encryptable string!!

About

ChangeUnits2

This powerful utility app offers lightning-fast and accurate unit conversions for a wide range of needs. It includes advanced math functions, currency exchange, time zone tracking, and even chemical equation balancing. Designed for professionals and everyday users alike, it works offline and remembers your last calculations.

Highlights
  • Extreme speed and accuracy
  • Offline functionality
  • Currency exchange converter
  • Global time zone tracking
  • Advanced math functions
  • Chemical equation balancing
  • Last 33 calculations remembered
Features
Read full description

Designed by an Engineer from the Semiconductor Industry, ChangeUnits2 is Built for Extreme Speed and Versatility. ChangeUnits2 is Very Fast. ChangeUnits2 is Very Accurate. ChangeUnits2 Fits inside your Pocket and Doesn't Require a Signal. ChangeUnits2 even Knows what Time it will be HERE (in your Current Location) at 7am in Tokyo. ChangeUnits2 is Built for EVERYONE. It has a Button for virtually ANY Unit and is Very Easy to Use. Tap on the Woman Welder on the Right to Launch the Quick Unit Selection Screen. Toggle the "Longform List" / "Engineering List" button to Switch Between 1) a List of Unit Buttons in Shortform Engineering style, or 2) in Longform style for a more Wordy Description. note: this ALSO toggles between Scientific Notation & Standard Decimal Form. Quickly change between Thermal Units of BTUs / Therms / Kwh / kCals / and even Gallons of Gasoline Need even more Significant Figures? Just add Zero's to the end of the number you entered, press "Convert Units" and ChangeUnits2 will do the rest. Use the built in Currency Converter travelCash, travelCash2, travelCash3 and travelCash4 to Easily VISUALIZE ANY Monetary Exchange Rate. Whether the Exchange Rate is in [Dollars : Donuts] or [Donuts : Dollars]....ChangeUnits2 handles it like a Pro! Effortlessly Calculate the Number of Pints of Beer held in a 1/2 Barrel Keg for your Big Football Party. Converting Between Standard and Metric has never been so Easy!! Easily keep track of the Time in Major Cities while you are ANYWHERE in the World!! No signal needed. Use the Globe Buttons to arrange International Meetings.....based on your Preferred Time....or even Theirs. Schedule a meeting at 7am Tokyo time, or 7am Los Angeles time. ConvertUnits2 will help you keep track of time like a Pro. Perform advanced math functions right in the App. It's so easy and convenient! Even exponents, Ln, Log, Prime Numbers and Square Roots. Balance Chemical Equations from ANYWHERE! Now you can bring your Periodic Table of the Elements with You! Thank you, Uncle Sam! Calculate the Minimum Fall Time / Maximum Energies / Maximum Speeds of a Fall from nearly ANY Height. Now you're the real life McGuber! The "Last Values" button Remembers your Last 33 Calculations using "Convert Units" Now you can show Data you compiled right on your iPhone without re-entering the Information. It's so Easy ChangeUnits2 will Change your Life for the Better It's a Science & Engineering Professional's Dream!

Screenshots

Mininigma4 screens
ChangeUnits24 screens

Verdict

The call

The clearest difference is rating: ChangeUnits2 at 5.0 against Mininigma's 4.5. ChangeUnits2 also leads on update cadence (every 4 weeks vs every 6 months) and price ($0.99 vs $1.99). Mininigma's advantage is ratings volume (30 vs 1). On ads, in-app purchases, 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

Mininigma costs $1.99 and ChangeUnits2 $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

ChangeUnits2 holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Mininigma has 30 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Mininigma ships an update every 6 months, ChangeUnits2 every 4 weeks. The most recent releases landed on September 26, 2026 and June 1, 2026 respectively.

Scorecard5 real differences · 5 level
Mininigma versus ChangeUnits2: the parameters behind the verdict, then further details
ParameterMininigmaChangeUnits2
Price$1.99$0.99 — better
Rating4.5 (30 ratings)5.0 (1 ratings) — better
Positive reviews90.3% of reviews—
Number of ratings30 — better1
Update frequencyEvery 6 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size35 MB17 MB
Age rating4+4+
DeveloperHoracio JimenezJack McCormack

Customer experience

Mininigma

All ratings30 ratings
Positive83.3%
Neutral10.0%
Negative6.7%
Written reviews93 reviews
Positive90.3%
Neutral5.4%
Negative4.3%

ChangeUnits2

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Mininigma

Reported bugs

15 issues
  • Audio not working after latest update
  • No sound from keyboard presses after update
  • UI elements cut off on newer devices (iPhone X, Dynamic Island)
  • App not compatible with VoiceOver screen reader
  • Help and tutorials use a difficult-to-read font
Show 10 more
  • App crashes and freezes iPad
  • Incomplete download and reload issues
  • Copy and paste not working with iOS 5
  • Light board not working
  • Ring settings may not be working
  • Dials on top are finicky
  • Spacing issues where words run together
  • Numerals not working
  • Some settings have little influence on the text
  • App crashes on opening

Requested features

17 requests
  • Add German language support
  • More Enigma models
  • Add numbers to the keyboard
  • Add a space bar
  • Improve readability of tutorial font
Show 12 more
  • Fix UI issues with newer devices (Dynamic Island, home gesture)
  • Add VoiceOver compatibility
  • Add a reset button for settings
  • Add landscape mode
  • Add other crypto simulators (NEMA, Jefferson wheel)
  • Add more sounds
  • Option to send key with ciphertext
  • Create authentic style code books
  • Add Enigma clock
  • Add Hagelin M209
  • Option to switch to a 'normal' iPhone keyboard
  • Improve directions for plugboard and rotors

ChangeUnits2

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Mininigma

No in-app purchases

None

ChangeUnits2

No in-app purchases

Questions

Is Mininigma free?
Mininigma costs $1.99, with no in-app purchases.
Is ChangeUnits2 free?
ChangeUnits2 costs $0.99, with no in-app purchases.
Which has better reviews, Mininigma or ChangeUnits2?
ChangeUnits2 is rated higher. Mininigma averages 4.5 out of 5 from 30 ratings, while ChangeUnits2 averages 5.0 from 1 ratings.
Do Mininigma or ChangeUnits2 have ads?
Neither Mininigma nor ChangeUnits2 shows ads.
Which is updated more often, Mininigma or ChangeUnits2?
Mininigma ships an update every 6 months, and ChangeUnits2 every 4 weeks. Most recently, Mininigma was updated on September 26, 2026 and ChangeUnits2 on June 1, 2026.

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