# Habit Tracker vs Stack Testers Flow Friend

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.

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.

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.

## The numbers

| Metric | Habit Tracker | Stack Testers Flow Friend |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (148K ratings)](https://appshunter.io/ios/app/habit-tracker/id1438388363/reviews)** | — |
| Number of ratings | **148K** | — |
| Positive reviews | **69.2% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 8 months |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#162** | — |
| Size | 303 MB | 32 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [InnerGrow](https://appshunter.io/developer/1828382777) | [Lewis Holmes](https://appshunter.io/developer/1454834389) |

## What reviewers say

### Habit Tracker

[App page](https://appshunter.io/ios/app/habit-tracker/id1438388363)

**Currently charting:** #162 Top Free · Productivity (US App Store)

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:** macOS Compatibility, Family Sharing, Siri integration, Apple Watch app, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $4.99 | per month |
| Habit Premium Yearly | $7.99 | per year |
| Enhance Yourself | $9.99 | per year |
| Lifetime Family | $12.99 | one-time |
| Habit Promo | $14.99 | one-time |
| Lifetime Member | $19.99 | one-time |

**What reviewers like**

- 👍 Customizable and user-friendly interface
- 🚀 Efficient and intuitive habit tracking
- 💡 Comprehensive data visualization and progress tracking
- 🔒 Secure and reliable app with no ads
- 💰 Affordable one-time premium purchase option

**What reviewers complain about**

- 🐛 Occasional bugs and glitches
- 🔒 Lack of iCloud sync and cross-device support
- 🔒 Limited free version with restricted features
- 🕰️ Inflexible habit scheduling options

**Reported bugs**

- 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**

- 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

[App page](https://appshunter.io/ios/app/stack-testers-flow-friend/id1454834655)

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:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*