chrtz vs Let's duck
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
chrtz
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A step‑based character ranking app with heatmap visibility and group competition. chrtz turns your steps into rank. Pick your favorite character, compete in solo or group rankings, and climb the leaderboard. Top spots unlock visibility perks—like message highlights and a larger presence on the heatmap. Track progress with Live Activity, earn rewards, and customize your character’s look with avatars and backgrounds. Every step counts, and every rank change is real. Highlights Step‑based solo & group rankings Top‑rank visibility perks (message highlight, heatmap presence) Live Activity for quick progress checks Character customization (avatars & backgrounds) Events and rewards tied to activity
Let's duck
This app features a pixelated duck that lives on your Apple Watch and encourages movement without pressure. It integrates with Apple Health, tracks workouts, and offers a calming breathing exercise. Optional purchases unlock customization and history.
- Integrates with Apple Health
- Tracks various workout types
- Offers guided breathing exercises
- Customizable duck outfits and colors
- Displays workout stats
- Watch face complications and widgets
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Let's Duck is a little pixel duck that lives on your Apple Watch and moves with you. I made it because most fitness apps made me feel like I was always behind. Rings to close, streaks to protect, numbers that turn red. I wanted something that just felt nice to open. So there's no score to keep up with here. The duck is simply happy when you move, and happy to see you when you don't. YOU DON'T HAVE TO DO ANYTHING SPECIAL Already use Apple's Workout app, or another app that saves to Apple Health? Your duck picks those workouts up on its own and counts them as its own. You don't have to change how you work out or remember to start anything. Just open the app now and then and say hi. NO PRESSURE, REALLY Take a week off and nothing breaks. Your duck won't sulk. It'll just be glad you're back. If you turn on reminders, they're gentle nudges like "lunch loop if you feel like it", and they skip the days you've already moved. Rest days are part of it. WHAT THE DUCK DOES • Comes along on walks, runs, swims, rides, yoga, strength and lots more, waddling through its own little world while you go • Cheers your small wins with a happy hop • Draws a map of your outdoor workouts, colored by pace, and lets you press play to watch it waddle the whole route again • Shows the stats that matter after a workout: time, distance, heart rate, pace and calories • Breathes with you: rest a finger on the screen for a calm minute on a night pond, with gentle taps for each breath in and out • Gets visitors now and then, like a frog, a hedgehog or another duck, and the odd small wonder like a rainbow or a family of ducklings • Lives on your watch face too, through complications and widgets Everything you record is saved to Apple Health. No account, no sign-up, no ads. FREE, WITH AN OPTIONAL EXTRA Tracking workouts with your duck is free for everyone. If you'd like to support the app, a one-time Premium purchase unlocks every outfit and color, your full history and the achievements gallery. No subscription. Let's Duck is made by one person. If you have an idea or something isn't working right, I'd love to hear from you through the review. Hope your duck makes your day a little lighter.
Screenshots
Verdict
The clearest difference is in-app purchases: chrtz at none against Let's duck's 1. chrtz also leads on iOS requirement (16.2 vs 26.6). Let's duck's advantage is update cadence (every 3 days vs weekly). On price, 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
Both are free to download. Let's duck sells 1 one-off in-app purchase. chrtz asks for nothing beyond the download.
chrtz ships an update weekly, Let's duck every 3 days. The most recent releases landed on September 30, 2026 and October 11, 2026 respectively.
| Parameter | chrtz | Let's duck |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Weekly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Requires iOS | 16.2 — better | 26.6 |
| Further details — not scored | ||
| Size | 59 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Sungsu Choi | trung truong |
In-app purchases
chrtz
No in-app purchases
Let's duck
- Let's Duck Unlimited$0.99









