Comparison

Habit Tracker vs Stack Testers Flow Friend

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

Head to head
About

Habit Tracker

This app helps you build lasting habits and achieve your goals with a simple daily planner. It offers flexible tracking, group challenges, and insightful analytics to monitor your progress and well-being.

Highlights
  • Sync with Apple Health
  • Build & Quit Habits
  • Flexible Goal Tracking
  • Group Habits
  • Insightful Stats
  • Smart Reminders
  • ADHD Planner
Features
Read full description

Habit Tracker: A simple daily planner to schedule and track your routine, making it easy to build lasting habits.  Join 15M+ happy users, achieve your goals, and make every day count! More than a self-care companion, it lets you share with others to grow and improve together. ----Useful Features---- Sync with Apple Health: Track water intake, steps, sleep, exercise, and calories to seamlessly monitor your wellness journey. Build & Quit Habits: Create positive routines or break free from bad habits with tailored tracking. Flexible Goal Tracking: Measure progress with specific units (e.g., minutes, glasses of water), not just checkmarks. Group Habits: Stay motivated by building, reminding, and tracking habits with friends or loved ones. Insightful Stats: Get detailed analytics to evaluate and celebrate your progress. Habit Reports: Weekly, monthly, and yearly reports to visualize your growth. Mood Tracking: Monitor your mental wellness to stay balanced and mindful. Smart Reminders: Set time- or location-based reminders to stay on track effortlessly. Multiple Reminders: Add as many reminders as needed for any habit. Custom Sounds: Record or import unique reminder sounds for a personal touch. Widgets for Easy Access: Use Home Screen & Lock Screen to log habits instantly without opening the app. HRV Stress Monitor: Track your heart rate variability (HRV) to measure stress levels and gain insights into your well-being Habit Diary: Jot down notes to reflect on your journey in a personal habit memo. Focus Timer: Stay focused with natural sounds & create a calming, distraction-free environment Cloud Sync: Back up and sync your data across devices for seamless access. Daily Inspiration: Enjoy motivational wallpapers and quotes to keep you inspired. Privacy Protection: Secure your data with FaceID or TouchID. Friendly Competition: Compete with friends to see who’s crushing their habits. ADHD Planner: ADHD friendly plans built-in to help. Dark Mode: Sleek design for a comfortable experience, day or night. Habit Tracker helps you simplify your daily routine, clear your mind, stay on track with your goals, and build a better life. Download now! Perfect for ADHD users, this app simplifies planning and tracking to help you stay focused, build routines, and thrive with ease. NOTE: Habit reads data for some habits from Apple Health app (Steps, energy, walking, running ..etc). No data is being sent outside of your device. Health app access required. EULA: https://www.eulatemplate.com/live.php?token=MRcYNs6U8BXMLSDWG0BzEqLPPtL2Vc46

About

Stack Testers Flow Friend

This mobile toolkit assists environmental engineers with on-site calculations for stack testing. Quickly determine velocity and volume flow by inputting stack size and gas conditions, eliminating the need for manual calculations or laptops. It also aids in calculating differential pressure cell mA output for data logging.

Highlights
  • Velocity and volume flow calculations
  • Input stack size and gas conditions
  • Differential pressure cell mA output calculation
  • Preloaded Engineers Note Book content
  • On-site calculation tool
Features
Read full description

Stack Testers Flow Friend is part of a suite of apps developed by the Engineers of CES Environmental Instruments, one of the UKs leading environmental Test Houses and incorporates some of their on-site calculations in an easy to use app. When working on the stack and you need to quickly calculate a velocity or volume flow, the answer can be at your fingertips. By inputting the essential parameters of the stack size and gas conditions, the velocity and volume flow can be determined without the need to manually calculate the value or start up a laptop. The app is an essential tool for the professional Environmental engineer. The app is a useful aid to the C & I engineer calculating the Differential Pressure cell mA output used for data logging. The contents of the CES Environmental Instruments popular Engineers Note Book is preloaded within the app.

Screenshots

Habit Tracker4 screens
Stack Testers Flow Friend4 screens

Verdict

The call

The clearest difference is review sentiment: Habit Tracker at 69% against Stack Testers Flow Friend's 0%. Habit Tracker also leads on update cadence (every 3 days vs every 8 months) and chart position (#162 vs unranked). Stack Testers Flow Friend's advantage is in-app purchases (none vs 6) and iOS requirement (13.0 vs 15.0). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Habit Tracker sells 6 in-app purchases, starting at $4.99 per month. Stack Testers Flow Friend asks for nothing beyond the download.

UpkeepUpdate frequency

Habit Tracker ships an update every 3 days, Stack Testers Flow Friend every 8 months. The most recent releases landed on November 1, 2026 and October 22, 2026 respectively.

Scorecard6 real differences · 5 level
Habit Tracker versus Stack Testers Flow Friend: the parameters behind the verdict, then further details
ParameterHabit TrackerStack Testers Flow Friend
PriceFreeFree
Rating4.8 (148K ratings) — better—
Positive reviews69.2% of reviews — better0.0% of reviews
Number of ratings148K — better—
Update frequencyEvery 3 days — betterEvery 8 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#162 — better—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size303 MB32 MB
Age rating4+4+
DeveloperInnerGrowLewis Holmes

Customer experience

Habit Tracker

All ratings148,389 ratings
Positive95.2%
Neutral2.4%
Negative2.4%
Written reviews1,730 reviews
Positive69.2%
Neutral8.3%
Negative22.5%

Stack Testers Flow Friend

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Habit Tracker

Reported bugs

4 issues
  • Habit data not syncing correctly across devices
  • Habit reminders not working as expected
  • Unexpected behavior when editing habit details
  • App crashes or freezes during use

Requested features

5 requests
  • Add ability to track 'negative' habits or limits
  • Improve habit editing and rearranging functionality
  • Implement more flexible habit scheduling options
  • Enhance Apple Watch integration with timer and tracking features
  • Provide option to export data in CSV format

Stack Testers Flow Friend

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

Habit Tracker

Subscriptions3
  • Monthly Premium$4.991 Month
  • Habit Premium Yearly$7.991 Year
  • Enhance Yourself3 Days trial$9.991 Year
One-time3
  • Lifetime Family$12.99
  • Habit Promo$14.99
  • Lifetime Member$19.99
None

Stack Testers Flow Friend

No in-app purchases

Questions

Is Habit Tracker free?
Habit Tracker is free to download, with in-app purchases available.
Is Stack Testers Flow Friend free?
Stack Testers Flow Friend is free to download, with no in-app purchases.
Do Habit Tracker or Stack Testers Flow Friend have ads?
Neither Habit Tracker nor Stack Testers Flow Friend shows ads.
Which is updated more often, Habit Tracker or Stack Testers Flow Friend?
Habit Tracker ships an update every 3 days, and Stack Testers Flow Friend every 8 months. Most recently, Habit Tracker was updated on November 1, 2026 and Stack Testers Flow Friend on October 22, 2026.

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