Comparison

Du Contracts vs Habit Stacker App

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

Head to head
About

Du Contracts

This app helps you build self-trust by creating time-bound "I Will" or "I Won't" commitments. Unfulfilled contracts are visible for a week, serving as a reminder to follow through on your promises to yourself.

Highlights
  • Create "I Will" or "I Won't" contracts
  • 24-hour contract expiration
  • Automatic failure tracking
  • Visible failure reminders
  • Build self-trust and accountability
Features
Read full description

The relationship you have with yourself is the most important one you’ll ever build. When you promise yourself you’ll call your doctor, do the dishes, or hit the gym—you owe it to yourself to follow through. At your core, you are two people constantly interacting with one another: the one who decides, and the one who acts. That’s Du! — the dialogue between you and yourself. Introducing Du Contracts. This app lets you create simple “I Will” or “I Won’t” contracts with a 24-hour expiration. Within that window, you either complete or fail your contract. If you don’t update it in time, it automatically moves to your Failure Folder. Failures stay visible on your home page for at least seven days—a gentle but firm reminder of your unfinished commitments. Hold yourself accountable. Build trust with yourself. Start your first Du Contract today.

About

Habit Stacker App

This app helps you build new routines by linking them to existing daily habits. Track your progress and watch your streaks grow as you consistently achieve your goals.

Highlights
  • Habit stacking technique
  • Streak tracking
  • Habit leveling system
  • Custom habit addition
  • Daily routine integration
Features
Read full description

What is habit stacking? Habit stacking is a proven productivity technique that pairs a new, desired behavior with an existing, automatic daily routine. By using an established habit as a natural trigger, you bypass the need for relying on willpower, making it significantly easier to build consistent routines. After I pour my morning coffee, I will write down my top priority for the day. The coffee is the trigger; the new habit stacks right on top. How the app works? 1. Add a habit and the date you started it. 2. Keep your streak — the app tracks how many days you've kept each habit. 3. Watch habits level up as streaks pass 1, 21, and 365 days.

Screenshots

Du Contracts3 screens
Habit Stacker App2 screens

Verdict

The call

The clearest difference is iOS requirement: Du Contracts at 13.0 against Habit Stacker App's 15.6. On price, rating, ratings volume and update cadence 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

On the App Store both sit at effectively the same score — 5.0 for Du Contracts against 5.0 for Habit Stacker App. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

Du Contracts ships an update every 3 days, Habit Stacker App every 2 days. The most recent releases landed on September 16, 2026 and August 27, 2026 respectively.

Scorecard1 real difference · 9 level
Du Contracts versus Habit Stacker App: the parameters behind the verdict, then further details
ParameterDu ContractsHabit Stacker App
PriceFreeFree
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews—100.0% of reviews
Number of ratings2 — better1
Update frequencyEvery 3 daysEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.6
Further details — not scored
Size19 MB4 MB
Age rating4+4+
DeveloperDylan KramerJohn Picasso

Customer experience

Du Contracts

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Habit Stacker App

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Du Contracts

No in-app purchases

None

Habit Stacker App

No in-app purchases

Questions

Is Du Contracts free?
Du Contracts is free to download, with no in-app purchases.
Is Habit Stacker App free?
Habit Stacker App is free to download, with no in-app purchases.
Which has better reviews, Du Contracts or Habit Stacker App?
Du Contracts and Habit Stacker App are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do Du Contracts or Habit Stacker App have ads?
Neither Du Contracts nor Habit Stacker App shows ads.
Which is updated more often, Du Contracts or Habit Stacker App?
Du Contracts ships an update every 3 days, and Habit Stacker App every 2 days. Most recently, Du Contracts was updated on September 16, 2026 and Habit Stacker App on August 27, 2026.

Other comparisons