Plank Timer vs Stack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Plank Timer
This app helps you build a consistent planking habit with a simple timer and tracking features. It offers countdown and countup modes, motivation through record management, and reminder notifications to ensure daily continuity. Strengthen your core efficiently with this straightforward tool.
- Plank timer (countdown)
- Stopwatch (countup)
- Record and history management
- Streak records
- Reminder notifications
- Core strength training
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Plank Timer is a dedicated app designed specifically to help you stick with planks. No login required—start your plank immediately. It's a simple training timer focused on features that keep you going. ■ Recommended for people who: ・Want to make planks a habit (do them daily) ・Want to track “Did I do it today?” and “How many seconds?” to beat their personal best ・Want their plank duration counted automatically ・Want to do strength training/core workouts efficiently in short time ・Prefer a simple app ・Want to strengthen your core for weight loss ■Main Features This app supports your motivation and habit formation with four simple features! ◯Plank Timer (Countdown) Set your target seconds and plank! ◯Stopwatch (Countup) Challenge yourself to see how many seconds you can plank! Aim for your personal best ◯ Motivation Boost with Record & History Management Track your progress with a plank history calendar, streak records, longest sessions, and cumulative plank time. ◯ Reminder Notifications to Support Continuity Get daily push notifications at your chosen time. ■ Contact Us For feature requests or bug reports, please contact us via the form below. https://forms.gle/t6fKosEPXR9Vctof8
Stack
This app helps you build and complete habits within a 90-day timeframe. It focuses on finishing cycles rather than perpetual tracking, with a limit of three habits at a time. The interface uses a grid to mark progress, and a widget provides quick access to daily tasks.
- Three habit limit
- 90-day completion cycles
- Manual grid progress tracking
- Home-screen widget
- One honest skip per week
- No accounts or data collection
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Stack is a habit tracker with a finish line. Three habits. Ninety days. Then it is done. The stack ships, archives, and you start fresh. The cap of three and the ninety days are not limits to pay past. They are the point. Most habit apps are built to keep you forever. Stack is built to end. - Three habits. No more. The limit is the feature. - Ninety days. A clean quarter, then a finish line. - One honest skip a week. It holds your streak but shows as a skip, never a fake fill. - The grid is the app. Ninety days of dots, filled in by hand. - A home-screen widget with today's three. Tap to mark. - Built in Liquid Glass for iOS 26. No accounts. No subscription. No analytics. Zero data collected. Pay once. It is yours. From hsla0001, an independent studio in New York. Void captures. Loop times. Protocol scores the room. Stack holds intent.
Screenshots
Verdict
The clearest difference is price: Plank Timer at Free against Stack's $6.99. Plank Timer also leads on ratings volume (11 vs 1) and device support (3 vs 1). On rating, update cadence, 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
Plank Timer is free to download; Stack costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Plank Timer against 5.0 for Stack. That said, the two scores are not equally well evidenced: Plank Timer has 11 ratings behind it against 1, so its average is the more settled of the two.
Plank Timer ships an update every 2 days, Stack daily. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.
| Parameter | Plank Timer | Stack |
|---|---|---|
| Price | Free — better | $6.99 |
| Rating | 5.0 (11 ratings) | 5.0 (1 ratings) |
| Number of ratings | 11 — better | 1 |
| Update frequency | Every 2 days | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 24 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Yoshiaki Kawano | hsla0001 |
In-app purchases
Plank Timer
No in-app purchases
Stack
No in-app purchases
