Comparison

Duffy vs Cudex

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

Head to head
About

Duffy

This app displays your daily step count directly on your Apple Watch face as a complication. It offers a full watch app for detailed stats and goal notifications, plus a companion iPhone app for deeper data analysis and trends. Access your fitness data at a glance without opening the Activity app.

Highlights
  • Watch face complication for step count
  • Full watch app for steps, flights, distance
  • Daily step goal notifications
  • Companion iPhone app for trends
  • HealthKit data integration
Features
Read full description

Duffy provides quick access to your step count directly on your Apple Watch face as a complication. I was surprised to find that a steps complication wasn’t included on Apple Watches out of the box. Being a veteran iOS developer, I decided to build one in my spare time. I really loved my prototype version and thought there were more people who would love it too. So I put in the extra effort to release it to the App Store for everyone! Duffy is completely free, has no ads, and is even open source so if you’re also a developer, you can help me enhance it. Duffy is a simple app, but it will probably turn into the most used app on your Apple Watch. No more opening the Activity app and scrolling around to find your steps. It’s now available at a glance. Duffy is more than just an elegant Apple Watch complication. Use the full watch app for easy access to your steps, flights climbed and distance travelled for today and the past week. Set a daily steps goal and be notified on your watch when you reach it. The companion iPhone app provides the same access to your steps, flights and distance on a much larger, easier-to-read surface while also allowing you to dig deeper into your data to see trends and statistics over time. Duffy reads the steps, flights climbed, distance travelled, and activity energy from your iPhone and Apple Watch from the Health app (via the HealthKit API).

About

Cudex

This app gamifies your daily steps by turning them into experience points to collect and hatch unique monsters. Earn in-app currency to customize your collection and compete with friends. Unlock new creatures and features with optional Pro upgrades.

Highlights
  • Collect monsters by walking
  • Earn XP from daily steps
  • Track steps via Apple Health
  • Compete with friends
  • In-app shop for customization
  • Optional Pro subscription for advanced features
Features
Read full description

There's a monster in here. Your steps collect more. Cudex turns your daily walking into a collection of monsters. Walk with your phone. Collect your steps. Hatch something new. Cudex is free to use, with no ads. Cudex Pro adds more. HOW IT WORKS • Your iPhone already counts your steps with Apple Health • Tap Collect in the app to turn today's steps into XP • XP raises your level, and every level hatches a new monster into your collection Every 100 steps is 1 XP. Steps you don't collect by midnight are gone, so the daily tap is the habit. Up to three reminders a day help you collect before the day ends. FREE FOR EVERYONE • 60 monsters to find, one every level • Streaks, badges and quests to chase • A history calendar of every day you've walked • Outfits and places for your monster from the shop, bought with coins you earn by walking • Share cards for a great day or a new monster • A daily step goal you set yourself WALK WITH FRIENDS Add friends with a code and see who has walked the most today. Tap a friend to see their monster, their collection and their badges. Friends is optional. Nothing is shared until you turn it on, and you can stop sharing at any time. WHAT CUDEX PRO ADDS • 48 rare monsters to find • Home screen and lock screen widgets, so you can collect without opening the app • Apple Watch complications • Insights: trends, consistency, your week, goal days and the hours you walk • The full shop of outfits and places YOUR STEPS, YOUR CHOICE Cudex reads step counts from Apple Health. Your steps stay on your phone unless you turn on Friends, and then only the friends you add can see them SUBSCRIPTION Cudex Pro is available as a monthly or yearly subscription, or as a one-time Lifetime purchase. If a free trial is offered, it converts to a paid subscription unless you cancel before it ends. Payment is charged to your Apple ID at confirmation of purchase. A subscription renews automatically unless you cancel at least 24 hours before the end of the current period. Manage or cancel it in your Apple ID settings. Collect monsters. Keep walking. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://acris.ai/monster-steps/privacy

Screenshots

Duffy4 screens
Cudex4 screens

Verdict

The call

The clearest difference is update cadence: Cudex at weekly against Duffy's every 4 months. Duffy's advantage is ratings volume (790 vs 6) and iOS requirement (18.6 vs 26.5). On price, rating, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Duffy sells 4 one-off in-app purchases and Cudex sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Duffy against 4.8 for Cudex. That said, the two scores are not equally well evidenced: Duffy has 790 ratings behind it against 6, so its average is the more settled of the two.

UpkeepUpdate frequency

Duffy ships an update every 4 months, Cudex weekly. Both last shipped on November 6, 2026.

Scorecard3 real differences · 7 level
Duffy versus Cudex: the parameters behind the verdict, then further details
ParameterDuffyCudex
PriceFreeFree
Rating4.7 (790 ratings)4.8 (6 ratings) — better
Positive reviews83.8% of reviews—
Number of ratings790 — better6
Update frequencyEvery 4 monthsWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, Apple WatchiPhone, Apple Watch
Requires iOS18.6 — better26.5
Further details — not scored
Size10 MB31 MB
Age rating4+4+
DeveloperThink Tank ProductionsSiraj Hasanov

Customer experience

Duffy

All ratings790 ratings
Positive92.5%
Neutral2.5%
Negative4.9%
Written reviews376 reviews
Positive83.8%
Neutral5.1%
Negative11.2%

Cudex

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

Duffy

One-time4
  • Tip $1$0.99
  • Tip $2$1.99
  • Tip $3$2.99
Show 1 more
  • Tip $5$4.99
3 purchases

Cudex

Subscriptions2
  • Pro Month$4.991 Month
  • Pro Year7 Days trial$29.991 Year
One-time1
  • Pro Lifetime$59.99

Questions

Is Duffy free?
Duffy is free to download, with in-app purchases available.
Is Cudex free?
Cudex is free to download, with in-app purchases available.
Which has better reviews, Duffy or Cudex?
Cudex is rated higher. Duffy averages 4.7 out of 5 from 790 ratings, while Cudex averages 4.8 from 6 ratings.
Do Duffy or Cudex have ads?
Neither Duffy nor Cudex shows ads.
Which is updated more often, Duffy or Cudex?
Duffy ships an update every 4 months, and Cudex weekly. Most recently, Duffy was updated on November 6, 2026 and Cudex on November 6, 2026.

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