Comparison

Physarum vs GravyLensing

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

Head to head
About

Physarum

Explore the fascinating emergent behavior of slime molds through a visually rich simulation. Adjust agent parameters, influence growth with intuitive controls, and discover complex, mesmerizing patterns.

Highlights
  • Slime mold behavior simulation
  • Autonomous agent control
  • Adjustable agent parameters
  • Maze solving and network formation
  • Vibrant color modes
  • Interactive system manipulation
Read full description

Explore artificial life through a living, flowing simulation inspired by Physarum polycephalum, the slime mold famous for forming networks, solving paths, and showing intelligence without a brain. Physarum turns simple local rules into complex motion. Thousands of agents sense trails, turn, move, and deposit new traces. As the field evolves, branching networks, waves, and organic textures emerge in real time. Use Physarum to: - Tune sensor distance, turn angle, movement, and trail strength - Paint into the field and guide the simulation by touch - Explore chaotic, branching, and self-organizing patterns - Save and restore interesting agents, fields, and rules - Create vivid generative visuals with color controls It is part science toy, part generative art studio, and part meditative visual instrument. Whether you study emergent systems, teach artificial life, or simply enjoy hypnotic motion, Physarum gives you a hands-on way to watch complexity grow from simple behavior.

About

GravyLensing

Features
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GravyLensing brings gravitational lensing, the cosmic phenomenon where space-time bends around massive objects, into your hands. ESA's Euclid mission is mapping this effect across billions of galaxies to reveal the dark universe. Now you can explore that same physics yourself. Point your camera anywhere and watch space-time bend like light passing through a galaxy cluster. Built on the same Singular Isothermal Ellipsoid (SIE) models astronomers use, every lens is a real galaxy cluster observed by Hubble, JWST, and Euclid, faithfully recreated on your device. Features • Apply scientifically accurate gravitational lensing to your live camera feed, photos, or videos • Browse a gallery of real galaxy clusters, each with their own unique lensing signature • Touch and drag to position the lens exactly where you want it • Adjust distance to sweep from subtle warping to extreme Einstein rings • Record warped video or capture still images and save them to your photo library Inspired by ESA's Euclid mission to map the dark universe, GravyLensing puts the physics of warped spacetime in your pocket. No ads. No data collection. Just physics.

Screenshots

Physarum4 screens
GravyLensing4 screens

Verdict

The call

The clearest difference is in-app purchases: GravyLensing at none against Physarum's 6. GravyLensing also leads on iOS requirement (16.4 vs 26.0). On price, update cadence, ads and device support 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. Physarum sells 3 one-off in-app purchases. GravyLensing asks for nothing beyond the download.

UpkeepUpdate frequency

Physarum ships an update every 5 weeks, GravyLensing every 2 months. The most recent releases landed on October 24, 2026 and October 14, 2026 respectively.

Scorecard2 real differences · 8 level
Physarum versus GravyLensing: the parameters behind the verdict, then further details
ParameterPhysarumGravyLensing
PriceFreeFree
Rating4.8 (32 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings32 — better—
Update frequencyEvery 5 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.016.4 — better
Further details — not scored
Size32 MB7 MB
Age rating4+4+
DeveloperGEORGY OSTROBRODWILLIAM JOSEPH ROPER

In-app purchases

3 purchases

Physarum

One-time3
  • Small developer tip2 variants$1.99
  • Medium developer tip2 variants$3.99
  • Big developer tip2 variants$5.99
None

GravyLensing

No in-app purchases

Questions

Is Physarum free?
Physarum is free to download, with in-app purchases available.
Is GravyLensing free?
GravyLensing is free to download, with no in-app purchases.
Do Physarum or GravyLensing have ads?
Neither Physarum nor GravyLensing shows ads.
Which is updated more often, Physarum or GravyLensing?
Physarum ships an update every 5 weeks, and GravyLensing every 2 months. Most recently, Physarum was updated on October 24, 2026 and GravyLensing on October 14, 2026.

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