Comparison

Universe Splitter vs SwarmFlow

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

Head to head
About

Universe Splitter

This app uses quantum physics to help you make decisions. Input two choices, and it uses a remote quantum device to determine which reality you end up in, allowing you to live out both outcomes in separate universes.

Highlights
  • Quantum decision-making
  • Splits universes based on choices
  • Uses remote quantum device
  • Based on many-worlds interpretation
  • Original and acclaimed app
Features
Read full description

Use Quantum Physics to Split Your Universe -- It's the Ultimate Decision-Maker THIS IS THE ORIGINAL! • An App Store "Top Paid App" • An App Store "Staff Favorite" • Endorsed by famous physicists And recently featured in: • "Something Deeply Hidden" best-selling book by Sean Carroll • "The Joe Rogan Experience" podcast • "This American Life" podcast "According to quantum mechanics, every observation brings new universes into existence. But these universes have been completely useless to us -- until now! Universe splitter helps guarantee that there's at least one version of you who has made all the right choices." -- Sean Carroll, physicist at Caltech and best-selling author "The functioning of this app is in complete agreement with the many-worlds interpretation of quantum mechanics." -- Garrett Lisi, PhD, Theoretical Physics Scientists say that every quantum event plays out simultaneously in every possible way, with each possibility becoming real in a separate universe. But that was just an abstract concept... until now! Because now, you can harness this powerful and mysterious effect right from your iPhone. When faced with a tough choice, Universe Splitter allows you to live out BOTH of your options... in separate realities.* No mere coin-flip app can make this claim! Here's how it works: Let's say you have to make a difficult decision — for example, whether to accept a job offer or to turn it down. Just type both actions into your Universe Splitter, and press the "Split Universe" button. Universe Splitter will then, over the internet, activate a remote "Quantis" brand quantum device (made by id Quantique, and certified by the National Metrology Institute of Switzerland) which will send a single photon into a quantum "either/or" state. According to current scientific thinking, though, the photon will actually be in a "both, but in separate universes" state! Within seconds, Universe Splitter will report to you which of those two universes you’re in, and by taking a different action in each, you will cause these previously identical universes to diverge.* Of course, you won't be able to see or interact with that other universe. In fact, you may question whether anything at all happened. But according to the prevailing quantum theory, there will be two of you pondering whether anything just happened! Right now you're probably wondering: Does this app genuinely contact a quantum device in Geneva? YES, it absolutely does, and we would be happy to provide proof of this upon request. Email eric@aerfish.com for more info. As BDembko writes: "The real joke... is that it's NOT a joke. Which actually makes it funnier, if you ask me. (Kind of an Andy Kaufman kind of thing) The guy actually went the extra 10 miles... and it seems so absurd to us, that we figure it's a joke. But it's not... which then means it is. This is seriously quantum humor to the extreme." And -- if an infinite supply of universes isn't enough for you -- this app also gives you stylish, retro, machine-age graphics (complete with industrial-strength sound effects) which will underscore the awe-inspiring significance of each twist and turn of your ever-branching multiverse. If you're a believer in the "Many Worlds" interpretation of quantum behavior, this app is a must. And if you're not, just think of this as THE most random of all coin-flip apps -- in that it uses the most random event in the universe: a single quantum event! *According to prevailing quantum theory. Universes cannot contact each other. Not responsible for user's actions. ©Copyright 2009 Eric Daniels - All Rights Reserved

About

SwarmFlow

Features
Read full description

SwarmFlow is a meditative fish swarm simulation, born from a moment at the beach in Mauritius. Watch the swarm move, touch the water, and experience the quiet fascination of collective life. Free Features: - Interactive fish swarm with realistic flocking behavior - Tap the screen and watch the flight reaction - Drag the food source to guide the swarm - Adjust swarm size and behavior Premium Features (one-time purchase): - Up to 150 fish for impressive swarms - 5 color themes: Deep Sea, Night, Coral, Ocean, and Beach - Current simulation: Tilt your iPhone and watch fish swim with or against the flow - AI-generated meditative soundscapes - Screensaver mode as a digital aquarium - Speed control to find your perfect pace - Subtle food sources with soft shadows for an even more harmonious experience No competition. No scores. Just the simple beauty of a swarm responding to your touch.

Screenshots

Universe Splitter4 screens
SwarmFlow4 screens

Verdict

The call

The clearest difference is price: SwarmFlow at Free against Universe Splitter's $1.99. SwarmFlow also leads on update cadence (weekly vs every 17 months). Universe Splitter's advantage is in-app purchases (none vs 1) and chart position (#38 vs unranked). On ads, 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

SwarmFlow is free to download; Universe Splitter costs $1.99 up front. SwarmFlow sells 1 one-off in-app purchase. Universe Splitter asks for nothing beyond the download.

UpkeepUpdate frequency

Universe Splitter ships an update every 17 months, SwarmFlow weekly. The most recent releases landed on October 27, 2026 and October 26, 2026 respectively.

Scorecard4 real differences · 7 level
Universe Splitter versus SwarmFlow: the parameters behind the verdict, then further details
ParameterUniverse SplitterSwarmFlow
Price$1.99Free — better
Rating4.7 (1.5K ratings) — better—
Positive reviews75.6% of reviews—
Number of ratings1.5K — better—
Update frequencyEvery 17 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
Best chart rank#38 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size104 MB8 MB
Age rating4+9+
DeveloperAerfish LLCOliver Lieven

Bugs and requests

Universe Splitter

Reported bugs

3 issues
  • App crashes or freezes during use
  • Inconsistent behavior across devices or OS versions
  • Issues with loading or connecting to the quantum device

Requested features

4 requests
  • Add ability to track and review past decisions
  • Improve visual design and user interface
  • Provide more information on the science behind the app
  • Allow customization of options and decision-making process

SwarmFlow

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Universe Splitter

No in-app purchases

1 purchases

SwarmFlow

One-time1
  • SwarmFlow Premium$1.99

Questions

Is Universe Splitter free?
Universe Splitter costs $1.99, with no in-app purchases.
Is SwarmFlow free?
SwarmFlow is free to download, with in-app purchases available.
Do Universe Splitter or SwarmFlow have ads?
Neither Universe Splitter nor SwarmFlow shows ads.
Which is updated more often, Universe Splitter or SwarmFlow?
Universe Splitter ships an update every 17 months, and SwarmFlow weekly. Most recently, Universe Splitter was updated on October 27, 2026 and SwarmFlow on October 26, 2026.

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