K Cast vs sportFX.ai
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
sportFX.ai
This app provides professional biomechanics coaching for athletes using only your phone. It captures and analyzes your movements in 3D to deliver personalized feedback for faster improvement and progress tracking.
- 3D biomechanics analysis
- Personalized feedback
- Movement capture via phone
- Progress tracking
- Sports-specific insights
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sportFX is the ultimate training companion for athletes of all levels, delivering professional-grade biomechanics coaching without the cost or complexity. Using just your phone, our app captures your movement, analyzes your biomechanics in 3D, and delivers personalized feedback in seconds. Whether you’re working on your swing, pitch, throw, or shot, sportFX gives you the insights to improve faster, stay motivated, and track your progress over time. Terms of Service: https://sportfx.ai/terms-of-service Privacy Policy: https://sportfx.ai/privacy-policy
Screenshots
Verdict
The clearest difference is price: sportFX.ai at Free against K Cast's $3.99. sportFX.ai also leads on ratings volume (46 vs 7) and iOS requirement (15.5 vs 17.0). K Cast's advantage is in-app purchases (none vs 6) and review sentiment (100% vs 79%). On rating, update cadence, 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
sportFX.ai is free to download; K Cast costs $3.99 up front. sportFX.ai sells 6 in-app purchases, starting at $16.99 per month. K Cast asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.6 for K Cast against 4.5 for sportFX.ai. That said, the two scores are not equally well evidenced: sportFX.ai has 46 ratings behind it against 7, so its average is the more settled of the two. Written reviews are what separate them: 100% of K Cast's written reviews are positive against 79% of sportFX.ai's.
Both ship on a similar rhythm, roughly every 2 weeks. Both last shipped on October 30, 2026.
| Parameter | K Cast | sportFX.ai |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.6 (7 ratings) — better | 4.5 (46 ratings) |
| Positive reviews | 100.0% of reviews — better | 78.6% of reviews |
| Number of ratings | 7 | 46 — better |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPod |
| Requires iOS | 17.0 | 15.5 — better |
| Further details — not scored | ||
| Size | 1 MB | 229 MB |
| Age rating | 4+ | 12+ |
| Developer | Randal Haehnel | NurivaTech A.I. Inc. |
Customer experience
K Cast
sportFX.ai
In-app purchases
K Cast
No in-app purchases
sportFX.ai
- sportFX Core Monthly$16.991 Month
- sportFX Elite Monthly$64.991 Month
- sportFX Max Monthly$129.991 Month
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- sportFX Core Annual$133.991 Year
- sportFX Elite Annual$649.991 Year
- sportFX Max Annual$999.991 Year









