Tidal Tank vs K Cast
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tidal Tank
This app provides how-to guides and exercise videos to enhance your full-body workouts using an unstable water-filled weight. It offers a fun and challenging way to train, activating smaller muscles for balance and power, and is portable for use anywhere.
- Full body workout through instability
- Adjustable weight up to 49 lbs
- Portable and easy to set up
- Online training center access
- Water level to weight indicator
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The official Tidal Tank app: How-to's, exercise videos, and a workout companion. About the Tidal Tank: - GET THE ULTIMATE FULL BODY WORKOUT THROUGH INSTABILITY – Pick up the Tidal Tank and you immediately feel its unforgiving properties. The entire weight of the water sloshing from one side to the other in response to the smallest tilt. In order to raise it above your head, even the smallest muscles are activated, working together with the bigger muscles to maintain balance and power. Because of this, even 20 pounds of water can humble trained athletes. - EXPERIENCE THE FUN CHALLENGE OF A ‘LIVE’ WEIGHT – In contrast to ‘dead’ weights, the Tidal Tank reacts to your every movement. Because of this, EVERY REPETITION IS DIFFERENT, asking something different from your muscles and motor control each time. This trains athletes to be robust, promotes muscle growth for the fitness lover, and most of all – according to our customers - is a lot of fun. - ADJUSTABLE UP TO 49 LBS (BUT FEELS MUCH HEAVIER) – The Tank can be filled with up to 45 pounds of water. But don’t focus on this weight too much, even experienced athletes only use it with 20 pounds and still get sore. It’s all about the movement. In the included brochure we even added an indicator to see how many pounds of water are in the Tank based on the water level height. - FOR IN THE GYM / HOME / OUTDOOR / HOLIDAYS .. – The Tidal Tank, when empty, is only 3 pounds and 2 by 5 inches when folded up. It is easy to take anywhere, and have it ready in minutes with the special pin valve. Push the pin once to open it up for water. Hold it under the faucet until you reach the desired weight. Push the pin again to open it up for air. Attach the pump, give it a few pumps until the Tank is firm, and you’re ready to go! - ONLY WITH THE TIDAL TANK: EVERYTHING YOU NEED – We are fully focused on the Tidal Tank, and want to give you everything you may need, in one purchase. So we made the Tidal Tank transparent, allowing you to see the water level, and included a handy water level to weight indicator so you can see how many pounds of water to add. Furthermore, you will get free access to our online training center with many exercises for your inspiration.
K Cast
This app allows baseball pitchers and catchers to communicate pitch calls securely and efficiently using a phone and AirPods. It eliminates the need for traditional signs, speeding up games and preventing stolen signals.
- Secure pitch communication
- Uses phone and AirPods
- Optional Apple Watch integration
- Eliminates traditional signs
- Speeds up game play
- Prevents stolen signals
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K Cast is an app that enables you to securely communicate pitches to your catcher using only hardware you likely already have—your phone and AirPods. No need to buy expensive hardware or set up confusing electronics. Give your catcher one AirPod that is already paired to your phone. We highly recommended you put the phone in transparency mode to let outside sound in. You can then give your pitcher an Apple Watch(worn on the glove hand under a black wrist band) with the Apple Watch K Cast app running to completely remove the need for the catcher to signal pitches to the pitcher. This will speed up games, eliminate pitcher/catchers getting crossed up on pitches and prevent those pesky runners on second base from stealing your pitches and signaling to their hitters. Next, in the K Cast app, tap the location in or outside the strike zone where you want the pitcher to pitch the baseball, select the pitch type, and tap Send. That’s it. The application lets you know the pitch was transmitted to the catcher’s AirPod. The catcher then signals the pitch to the pitcher. K Cast is secure and enables you to effortlessly send pitches to your catcher without having to use cumbersome signs or codes that can be stolen by overzealous coaches with too much time on their hands. Tips: - Make sure your phone is not muted and the volume is at a reasonable level. A muted phone will not speak the pitch or location to the catcher. - If you have multiple catchers, you can give each their own AirPod tip. - Put your phone in "Do Not Disturb" mode so any calls or texts don't disturb the catcher. - If you are using the Apple Watch app, you probably want to have the pitcher take it off between innings and put it on a portable charger so that it doesnt run low on battery while pitching.
Screenshots
Verdict
The clearest difference is review sentiment: K Cast at 100% against Tidal Tank's 27%. K Cast also leads on rating (4.6 vs 2.2) and update cadence (every 2 weeks vs every 6 weeks). Tidal Tank's advantage is price (Free vs $3.99) and ratings volume (31 vs 7). On ads, in-app purchases 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
Tidal Tank is free to download; K Cast costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
K Cast holds the better App Store score, 4.6 against 2.2. Both are backed by a comparable volume of ratings — 31 and 7 respectively. Written reviews point the same way: 27% of Tidal Tank's written reviews are positive against 100% of K Cast's.
Tidal Tank ships an update every 6 weeks, K Cast every 2 weeks. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.
| Parameter | Tidal Tank | K Cast |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 2.2 (31 ratings) | 4.6 (7 ratings) — better |
| Positive reviews | 26.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 31 — better | 7 |
| Update frequency | Every 6 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Best chart rank | — | #177 — better |
| Devices | iPhone, iPod | iPhone, iPad, Apple Watch — better |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 65 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Tidal Tank | Randal Haehnel |
Customer experience
Tidal Tank
K Cast
In-app purchases
Tidal Tank
No in-app purchases
K Cast
No in-app purchases









