Pond Koi vs Roo's Lights
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pond Koi
Create a serene digital pond with swimming koi, customizable backgrounds, and natural soundscapes. Interact with the fish, add flowers, and enjoy a stress-relieving visual and auditory experience.
- Realistic koi fish simulation
- Customizable pond backgrounds
- Interactive fish feeding and teasing
- Variety of natural sound effects
- Flower and leaf arrangement
- Realistic water splashes and ripples
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Pond Koi: A 100% Text-Free Interactive Zen Sandbox "Pond Koi" is a premium sensory cooldown designed to cure late-night work anxiety and daytime stress. Driven entirely by a minimalist, textless interface, there are no words, no messy menus, and zero intrusive ads—just a pure, immersive space for absolute mindfulness. Interactivity & Sensory Freedom: Tap for Flow: Tap or drag your finger to create ultra-realistic, haptic water ripples accompanied by crisp, high-fidelity nature sounds (ASMR). Nurture Your Koi: Feed and interact with beautifully animated koi fish as they gracefully glide across your screen. Curate Your Sanctuary: Custom-design your personal zen oasis by freely placing green leaf, petal, feather, and floating blossoms. Message from the Creator: Hi, I’m an independent solo developer. I spent months coding "Pond Koi" to create a safe, peaceful refuge from my own chronic anxiety. Because it requires absolutely no reading, it is fully accessible and friendly for everyone—from toddlers to seniors. Published transparently under my real name, this project is my labor of love. If you enjoy this tiny pocket of peace, please consider leaving a review. It means the world to a solo creator.
Roo's Lights
A simple, ad-free interactive toy for babies and toddlers inspired by minimalist children's books. It features four switches that control four lights, offering an engaging experience for little ones.
- Four switches
- Four lights
- Ad-free experience
- Inspired by children's books
- Toddler-friendly design
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Four switches, four lights. But for how long? Perfect for babies who love buttons, Roo's Lights is a simple, elegant toddler toy, inspired by minimalist children's books such as "Freight Train", "Press Here" & "10 Black Dots." Totally ad free.
Screenshots
Verdict
The clearest difference is review sentiment: Roo's Lights at 100% against Pond Koi's 31%. Roo's Lights also leads on price (Free vs $2.99) and rating (5.0 vs 3.1). Pond Koi's advantage is update cadence (every 2 months vs every 6 months) and ratings volume (16 vs 1). On ads and in-app purchases 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
Roo's Lights is free to download; Pond Koi costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Roo's Lights holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: Pond Koi has 16 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 31% of Pond Koi's written reviews are positive against 100% of Roo's Lights's.
Pond Koi ships an update every 2 months, Roo's Lights every 6 months. The most recent releases landed on November 11, 2026 and November 1, 2026 respectively.
| Parameter | Pond Koi | Roo's Lights |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.1 (16 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 30.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 16 — better | 1 |
| Update frequency | Every 2 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod, Mac, Apple TV — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 228 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | 荣辉 张 | Sources and Methods |
Customer experience
Pond Koi
Roo's Lights
In-app purchases
Pond Koi
No in-app purchases
Roo's Lights
No in-app purchases
Questions
Is Pond Koi free?
Is Roo's Lights free?
Which has better reviews, Pond Koi or Roo's Lights?
Do Pond Koi or Roo's Lights have ads?
Which is updated more often, Pond Koi or Roo's Lights?
Other comparisons
