Grass vs Atomus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Breath-guided breathing exercises
- Microphone-controlled wind simulation
- Compass-oriented field direction
- Touch-based grass combing
- Customizable scenes and wind intensity
- Individual blade simulation
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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.
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.
- 10-Finger Multi-touch Display
- 5 Music Choices
- Fastest Speed (60 FPS)
- 12,000 Particles
- Customizable Particle Length, Number, & Size
- 3-Color Modes
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
Grass ships an update every 95 months, Atomus every 2 months. Both last shipped on October 22, 2026.
| Parameter | Grass | Atomus |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (202 ratings) | 4.8 (528 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 89.5% of reviews |
| Number of ratings | 202 | 528 — better |
| Update frequency | Every 95 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 7 MB | 92 MB |
| Age rating | 4+ | 4+ |
| Developer | CW&T | SungLab Inc |
Customer experience
Grass
Atomus
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
Grass
No in-app purchases
Atomus
No in-app purchases









