Smart Sack vs WhichLocker
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Smart Sack
This app connects to a smart sack to track your kicks or juggles. It displays your current score, best scores, and can announce your progress audibly. The app supports background operation for uninterrupted play and offers customizable voice and language options.
- Real-time kick and juggle scoring
- Displays ongoing, best, and best ever scores
- Audible score announcements
- Customizable voice and language options
- Background operation support
- Connects to unique smart sack names
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The Smart Sack app connects to your Smart Sack. Works for Hacky Sack and Juggling. During play the app shows your score (number of consecutive kicks or juggles without hitting the ground) and announces your score. You can choose the language and voice from many different options. Shows: Kicks - ongoing kick count without hitting the ground or holding for too long Best - most consecutive kicks since the app was last started Best Ever - most consecutive kicks ever Each sack has it's own unique name. After connecting, the sack name is shown at the top of the app. Also works in background mode so you can put your phone in your pocket and continue to hear your kick count and track your stats. ----Getting Started---- Start (Turning on sack) The smart sack turns on when it detects a toss. One foot up in the air should be plenty. If the app is on then it will connect to the sack and you will see the name of the sack at the top of the app. Play The smart sack sends kick and toss data to the app. The app announces your score. If the smart sack detects it is still (on the ground or on your desk, etc) or if you hold it for too long, then it resets the score to 0. Stopping The smart sack automatically goes to sleep if no kicks are detected for a while. No need to do anything else. ----FAQs---- Can I share my score? No, the app does not have a way to share scores and stats. Can I change my smart sack name? No, the name is fixed. Is the smart sack name unique? We estimate there are about 500,000 different names, so it is very unlikely that you will find two smart sacks with the same name! Can I use more than one smart sack at the same time? The app can only connect to one smart sack, but multiple sacks can be used in the same room at the same time. If an app connects to the wrong sack, force kill the app. After the app connects to the correct sack, it will only connect to that sack until you force kill the app. Does the app work in the background? Yes the app will continue to run in the background, either while using other apps, or when the screen is off. So you can close the screen and continue to play and hear your score. What is the range? The connection should work up to 20 feet or more. Does it work without the app? No, it doesn't do much without the app. There is no speaker to announce your score. Can I use the smart sack for juggling? Yes that smart sack will work with counting while juggling, although you can only connect to one sack at a time, so the count will be the number of “rounds” completed. Are there firmware updates? The smart sack can receive firmware updates to add new features and improve the kick detection. If a firmware update is available, it will start when the sack connects to the app.
WhichLocker
This utility app helps you easily track and remember important numbers like locker combinations, parking spots, or room numbers. Access your saved values instantly through widgets and Apple Watch complications, with added support for Siri shortcuts.
- Save numbers with custom labels and colors
- Stack temporary entries
- Counter mode with +/- controls
- Home Screen and Lock Screen widgets
- Apple Watch complications
- Siri shortcuts integration
- Cross-device sync
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WhichLocker is a simple number tracker for lockers, parking spots, hotel rooms, apartment numbers, counters, and any value you need to keep handy. Keep your current number available on iPhone, Apple Watch, Home Screen widgets, Lock Screen widgets, and watch complications so it is always easy to check. Version 1.2 adds a stacked-entry workflow, so you can save a temporary number, switch to a new one, and jump back later. Features: • Save a number with a custom label and color • Stack temporary entries and return to the previous one • Use counter mode with +/- controls on iPhone, widgets, and Apple Watch • Check your number from Home Screen widgets, Lock Screen widgets, and watch complications • Use Siri shortcuts to check, set, increment, or decrement your value • Keep updates in sync between iPhone, widgets, Apple Watch, and complications • No account required • No ads
Screenshots
Verdict
The clearest difference is price: Smart Sack at Free against WhichLocker's $0.99. Smart Sack also leads on iOS requirement (12.2 vs 17.0). WhichLocker's advantage is update cadence (every 6 months vs every 13 months). On rating, ratings volume, 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
Smart Sack is free to download; WhichLocker costs $0.99 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 Smart Sack against 5.0 for WhichLocker. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Smart Sack ships an update every 13 months, WhichLocker every 6 months. The most recent releases landed on September 30, 2026 and June 4, 2026 respectively.
| Parameter | Smart Sack | WhichLocker |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 13 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, Apple Watch |
| Requires iOS | 12.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 1 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Iguanavation Inc | Torn Metal LLC |
Customer experience
Smart Sack
WhichLocker
In-app purchases
Smart Sack
No in-app purchases
WhichLocker
No in-app purchases
Questions
Is Smart Sack free?
Is WhichLocker free?
Which has better reviews, Smart Sack or WhichLocker?
Do Smart Sack or WhichLocker have ads?
Which is updated more often, Smart Sack or WhichLocker?
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