Comparison

Grass vs Atomus

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

Head to head
About

Grass

This app simulates a field of grass that reacts to your breath, touch, and device orientation. Experience interactive breathing exercises, gentle wind simulations, and tactile feedback.

Highlights
  • Breath-guided breathing exercises
  • Microphone-controlled wind simulation
  • Compass-oriented field direction
  • Touch-based grass combing
  • Customizable scenes and wind intensity
  • Individual blade simulation
Features
Read full description

A field of grass that breathes with you. Breathe with it. Tap BREATHE and a pacer leads you through a slow breath — in, hold, out — and the whole field follows. The grass draws in toward you as you inhale and a gust rolls away from you as you exhale, so you pace your breath by watching a meadow instead of a shrinking circle. Three patterns: a long-exhale 4·6 for settling, box breathing, and 4·7·8 for sleep. Blow on the OUT to push the gust harder. The app keeps a quiet count of your sessions and breaths — no streaks, no reminders. Blow on it. Grass listens to the microphone — but only for breath. It knows the low rush of air on the mic from a voice or a song, so talking, music, and a noisy room leave the field still; a breath rolls a gust up through it. Blow hard and it flattens; stop and it settles back. Nothing is recorded — the app measures the moment and throws the sound away. Turn it. The wind comes from north. Real north — Grass reads your compass, so the field is oriented to the room you're standing in. Turn slowly and the blades swing to keep leaning away from magnetic north. Turn all the way round and the whole field lies down the other way. Comb it. Blades bend away from your finger and stay bent, and the field remembers every path you've traced through it. Use several fingers at once; each one combs its own way. Make it yours. Four scenes — a midsummer meadow, a dry straw field, a moonlit night, a first frost. A wind slider from dead calm to blustery. A breath sensitivity control. The pacer pattern. All behind a single quiet MENU. It moves in layers, not sheets. Long blades are a longer lever with more sail area, so they catch far more of a gust than short ones. The tall stuff lies over while the low stuff only stirs — the same reason a real field ripples instead of tilting all at once. Tens of thousands of blades, each one simulated individually, on the GPU. Between your breaths the natural wind is barely there — a field at rest, waiting for you. No score. No streak. Nothing to finish, nothing to miss. Grass makes no network connection of any kind, has no account, and collects nothing. Microphone and compass readings never leave your device.

About

Atomus

This app is an interactive visualizer that creates beautiful, dynamic art inspired by natural phenomena and abstract concepts. It offers customizable particle effects, multi-touch interaction, and music integration, designed to inspire creativity or provide a relaxing visual experience.

Highlights
  • 10-Finger Multi-touch Display
  • 5 Music Choices
  • Fastest Speed (60 FPS)
  • 12,000 Particles
  • Customizable Particle Length, Number, & Size
  • 3-Color Modes
Features
Read full description

ATOMUS — A Living Kinetic Universe in Your Hands Touch energy. Shape motion. Watch light come alive. ATOMUS transforms your screen into a living kinetic universe where thousands of particles react instantly to every movement, creating flowing structures, cosmic patterns, and mesmerizing visual motion that feels both dynamic and calming. Designed for moments when you want to reset your mind, explore visual creativity, or simply watch something beautiful evolve under your fingertips, ATOMUS offers a unique sensory experience between digital art and meditation. Every touch creates shifting forms that can feel like fireworks, auroras, galaxies, waves, atomic structures, or living energy — always moving, always changing. Why users love ATOMUS • Deeply immersive touch interaction • Hypnotic moving particle structures • Ideal for creative focus and visual relaxation • A satisfying sensory experience that never feels the same twice • Beautiful for both quiet moments and playful exploration A Dynamic Visual Experience ATOMUS is inspired by: • fireworks • whirlwinds • fireflies • auroras • rainbows • waves • atomic forms Each interaction creates evolving structures that feel alive and endlessly surprising. Real-Time Performance • Up to 12,000 particles in real time • Smooth 60 FPS rendering • 10-finger multi-touch support • Adjustable particle size, quantity, and trail length • 3 color modes: Neon, Crystal, Nature • Built-in music by Aden Ray (optional) Free Version Enjoy ATOMUS for free. Upgrade to HD for: • 2× more particles • Ad-free experience • Richer visual density Support If you have ideas, questions, or feedback, I would love to hear from you. sunglab@gmail.com http://www.sunglab.com

Screenshots

Grass3 screens
Atomus4 screens

Verdict

The call

The clearest difference is rating: Atomus at 4.8 against Grass's 3.7. Atomus also leads on update cadence (every 2 months vs every 95 months). Grass's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, ratings volume, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Atomus holds the better App Store score, 4.8 against 3.7. Both are backed by a comparable volume of ratings — 202 and 528 respectively. Written reviews complicate that: 100% of Grass's written reviews are positive against 89% of Atomus's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Grass ships an update every 95 months, Atomus every 2 months. Both last shipped on October 22, 2026.

Scorecard5 real differences · 5 level
Grass versus Atomus: the parameters behind the verdict, then further details
ParameterGrassAtomus
PriceFreeFree
Rating3.7 (202 ratings)4.8 (528 ratings) — better
Positive reviews100.0% of reviews — better89.5% of reviews
Number of ratings202528 — better
Update frequencyEvery 95 monthsEvery 2 months — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.015.6 — better
Further details — not scored
Size7 MB92 MB
Age rating4+4+
DeveloperCW&TSungLab Inc

Customer experience

Grass

All ratings202 ratings
Positive67.8%
Neutral3.0%
Negative29.2%
Written reviews20 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Atomus

All ratings525 ratings
Positive93.9%
Neutral2.7%
Negative3.4%
Written reviews152 reviews
Positive89.5%
Neutral4.6%
Negative5.9%

Bugs and requests

Grass

Not enough reviews yet to summarise bugs or requests.

Atomus

Reported bugs

2 issues
  • Crashes when using more than 10 fingers
  • Inconsistent ad frequency

Requested features

3 requests
  • More color and particle effect options
  • Ability to turn off sound/music
  • Haptic feedback support

In-app purchases

None

Grass

No in-app purchases

None

Atomus

No in-app purchases

Questions

Is Grass free?
Grass is free to download, with no in-app purchases.
Is Atomus free?
Atomus is free to download, with no in-app purchases.
Which has better reviews, Grass or Atomus?
Atomus is rated higher. Grass averages 3.7 out of 5 from 202 ratings, while Atomus averages 4.8 from 528 ratings.
Do Grass or Atomus have ads?
Atomus shows ads; Grass does not.
Which is updated more often, Grass or Atomus?
Grass ships an update every 95 months, and Atomus every 2 months. Most recently, Grass was updated on October 22, 2026 and Atomus on October 22, 2026.

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