Comparison

Piazza vs Enigma Operator

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

Head to head
About

Piazza

This platform facilitates communication and learning for higher education. Students can ask and answer questions, while instructors can monitor student engagement. It provides real-time updates and a centralized space for class interactions.

Highlights
  • Ask and answer questions
  • Real-time updates
  • Centralized class communication
  • Student engagement monitoring
  • Mobile access for students and instructors
Read full description

Piazza is the leading social learning platform for higher education, used by hundreds of thousands of students and more than 15 thousand professors for centralized class communications and polling. If you're a student, the Piazza app lets you ask and answer questions in all your Piazza classes from your mobile device, and updates you in real time when your peers are engaged. If you're an instructor, the app gives you a simple way to check in on your students during those spare moments between meetings. Stay connected to your class with Piazza!

About

Enigma Operator

Features
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In 1943, the most secret messages in the world were locked by a machine with 159 quintillion settings. Now it fits in your pocket. Enigma Operator is a complete, historically faithful simulation of the two most famous cipher machines of the Second World War: the three-rotor Enigma I used by the German Army and Air Force, and the four-rotor Enigma M4 carried aboard the U-boats. Every rotor wiring, every reflector, even the machine's famous double-stepping quirk is reproduced exactly - verified against the historical test vectors. If it happened on the real machine, it happens here. YOU DON'T JUST PRESS BUTTONS. YOU OPERATE THE MACHINE. Open the lid and lift real rotors out of their box. Hear the most satisfying click of the real machine keystrokes. Set the ring positions. Plug the cords into the Steckerbrett. Scroll the windows to the day's ground setting and watch the signal race through a live wiring diagram with every key you press. Then sit down at the captain's desk, where the actual documents of the Kriegsmarine cipher system are waiting: daily key sheets, the Kenngruppenbuch, bigram tables, the Tauschtafelplan, allocation lists - all of them real, all of them working, all of them needed. NEVER TOUCHED A CIPHER MACHINE? PERFECT. A step-by-step interactive tutorial starts with a battery and a lightbulb and ends with you performing the complete, authentic Kriegsmarine decryption procedure by hand - the same document chain a U-boat radioman worked through in 1943. No experience needed. Just curiosity. ALREADY KNOW YOUR ROTORS FROM YOUR REFLECTORS? This is the deep simulation you've been looking for. Era-accurate procedures from 1937 to 1943, including the doubled message keys the Polish cryptanalysts exploited, the Kenngruppen system, M3/M4 compatibility, and the operator shortcuts Bletchley Park called "cillies" - because the weak link in the chain was always the human element. SOMETHING NEW EVERY DAY - DAILY DECRYPT: one fresh intercept each day, for each machine, drawn from thousands of authentic daily keys. Same puzzle for everyone every day. - SEND IT!: one message to encrypt each day - compose the full transmission yourself, preamble and all, exactly by the book. - TICK TOCK SETUP: race the clock to rig the machine from a real key sheet. - PROTOCOL PUZZLES: nine hand-built mysteries of garbled signals, lazy operators, and impossible indicators. Deduce what went wrong using nothing but the documents on your desk - with a pair of rhyming hints if you're stuck, and a secret or two for those who solve them all. ALSO ABOARD - A working notepad that keeps your worksheets - Best times for every challenge - Atmospheric sound, from the machine's keys to the hum of the boat -all optional - Fully offline. No ads. No accounts. No data collected. Nothing between you and the machine. Eighty years ago, breaking this machine took the best minds of a generation. Setting it up correctly took a nineteen-year-old with cold hands and a codebook. Tonight, both jobs are yours.

Screenshots

Piazza3 screens
Enigma Operator4 screens

Verdict

The call

The clearest difference is price: Piazza at Free against Enigma Operator's $1.99. Enigma Operator's advantage is update cadence (every 2 days vs every 11 days). 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

Piazza is free to download; Enigma Operator costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Piazza ships an update every 11 days, Enigma Operator every 2 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
Piazza versus Enigma Operator: the parameters behind the verdict, then further details
ParameterPiazzaEnigma Operator
PriceFree — better$1.99
Rating2.1 (282 ratings) — better—
Positive reviews13.7% of reviews—
Number of ratings282 — better—
Update frequencyEvery 11 daysEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size3 MB219 MB
Age rating4+4+
DeveloperPiazza Technologies, Inc.Wayne Campbell

Bugs and requests

Piazza

Reported bugs

4 issues
  • Inability to post or reply
  • Randomly logs out users
  • Fails to load posts and resources
  • Incompatible with newer iOS versions

Requested features

5 requests
  • Dark mode option
  • Ability to access course materials
  • Improved formatting and editing tools
  • Better organization of posts and discussions
  • Seamless integration with web version

Enigma Operator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Piazza

No in-app purchases

None

Enigma Operator

No in-app purchases

Questions

Is Piazza free?
Piazza is free to download, with no in-app purchases.
Is Enigma Operator free?
Enigma Operator costs $1.99, with no in-app purchases.
Do Piazza or Enigma Operator have ads?
Neither Piazza nor Enigma Operator shows ads.
Which is updated more often, Piazza or Enigma Operator?
Piazza ships an update every 11 days, and Enigma Operator every 2 days. Most recently, Piazza was updated on November 6, 2026 and Enigma Operator on October 31, 2026.

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