Comparison

OpEvol vs Schrode the Cat

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

Head to head
About

OpEvol

Experience a dynamic, ever-changing display of psychedelic visuals inspired by 1960s Op Art. This app creates animated fields of geometric colors and contrasts for passive viewing or interactive play.

Highlights
  • Animated geometric patterns
  • Op Art inspired visuals
  • Psychedelic color displays
  • Interactive visual play
  • Air Display compatibility
Features
Read full description

Inspired by Op Art of the 1960s, OpEvol takes the geometric play of colors and contrasts and animates them into a moving field of ever-changing, optical, kinetic abstraction. It's for staring at. It's for sending to Air Display. Or an external monitor. Or a projector. It's something mesmerizing to design and watch evolve, or just leave on in the background as art. OpEvol Pro is an auto-renewing annual subscription (price shown in the app). Payment is charged to your Apple ID at purchase, and it renews automatically unless canceled at least 24 hours before the end of the period. Manage or cancel anytime in your Apple ID settings. Privacy Policy: https://muddlegeist.com/opevol/privacy Terms of Use (EULA): https://muddlegeist.com/opevol/terms

About

Schrode the Cat

This app acts as a fun decision-making tool, answering your yes/no questions with a simple tap. Inspired by a famous physics experiment, it offers playful responses and can even be used within messaging apps. It's available across multiple Apple devices and platforms.

Highlights
  • Yes/No question answering
  • Decision making tool
  • Messaging app integration
  • Watch face complications
  • Multiple language support
  • Zombie mode toggle
Features
Read full description

The purrfect decision maker! Ask Schrode your yes/no question, tap the box, and Schrode will answer. Is Schrode alive, dead, or perhaps the undead?! Use Schrode the Cat to make decisions in your life: • "Should I eat pizza for dinner tonight?” • "Is bubble tea the best drink ever made?” • "Should I go to the movies tomorrow?” You can even use Schrode to answer your friend's questions in Messages. Just reply with Schrode for Messages. Let Schrode make the decision for you! Schrode the Cat works on Mac, iPhone, iPad, Apple Watch, Apple TV and even Messages on your iPhone and iPad. It also is available as a widget for iPhone and iPad, and is available in multiple languages. Every 15 minutes watch faces that allow text display (Infograph for example) will show a random response. No need to open the app! Ask a question and glance at your watch face, and the complication will tell you the answer (as long as it has been over 15 minutes since you last tried). • "Schrode, should I download this app?". Schrode says, "Yes". Schrode the Cat is inspired by Schrödinger's Cat – a physics thought experiment devised by physicist Erwin Schrödinger in 1935. You can choose to turn off "zombie mode" to adhere to strict "Schrödinger mode” too if you are a physics nerd, or scared of zombies. • "Would Erwin Schrödinger have approved of Schrode the Cat?". Schrode says, "Certainly”. So what are you waiting for? Download Schrode the Cat now. And don’t forget to download it for Apple TV and Mac too, so you can ask Schrode questions from the comfort of your living room! *Please note that the answers Schrode supplies are for entertainment purposes only. Do not come after us if you don't like the answer, or the answer gets you in trouble! * Easter egg revealed! Copy some short text to your clipboard, and in messages hold 1 finger on the closed box in the messages app and wait a few seconds!

Screenshots

OpEvol3 screens
Schrode the Cat4 screens

Verdict

The call

The clearest difference is review sentiment: Schrode the Cat at 100% against OpEvol's 27%. Schrode the Cat also leads on in-app purchases (none vs 1) and update cadence (every 9 months vs every 22 months). On price, ads and monetization model 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. OpEvol sells 1 in-app purchase, starting at $6.99 per year. Schrode the Cat asks for nothing beyond the download.

UpkeepUpdate frequency

OpEvol ships an update every 22 months, Schrode the Cat every 9 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

Scorecard5 real differences · 5 level
OpEvol versus Schrode the Cat: the parameters behind the verdict, then further details
ParameterOpEvolSchrode the Cat
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews27.3% of reviews100.0% of reviews — better
Number of ratings—2 — better
Update frequencyEvery 22 monthsEvery 9 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPad, Apple TViPhone, iPad, Mac, Apple TV, Apple Watch — better
Requires iOS26.018.6 — better
Further details — not scored
Size3 MB182 MB
Age rating4+9+
DeveloperMuddlegeistcurmi.com

Customer experience

OpEvol

Written reviews11 reviews
Positive27.3%
Neutral0.0%
Negative72.7%

Schrode the Cat

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

OpEvol

Subscriptions1
  • OpEvol Annual Subscription$6.991 Year
None

Schrode the Cat

No in-app purchases

Questions

Is OpEvol free?
OpEvol is free to download, with in-app purchases available.
Is Schrode the Cat free?
Schrode the Cat is free to download, with no in-app purchases.
Do OpEvol or Schrode the Cat have ads?
Neither OpEvol nor Schrode the Cat shows ads.
Which is updated more often, OpEvol or Schrode the Cat?
OpEvol ships an update every 22 months, and Schrode the Cat every 9 months. Most recently, OpEvol was updated on November 1, 2026 and Schrode the Cat on November 2, 2026.

Other comparisons