Every hit, measured. Every rally, mastered.
Jokari turns your phone's microphone into a smart impact detector — counting hits, tracking rally streaks, and pacing your reaction speed for tennis, squash, padel, and table tennis wall drills.
A digital coach in your pocket.
From impact detection to progress charts, Jokari gives your solo sessions the structure of a real training program.
Smart Audio Hit Counter
Advanced microphone analytics automatically detect and count every ball contact with your strings or the wall — no manual tapping required.
Real-Time Rally Streak
Track your longest uninterrupted hitting streak live, so you can stay locked on the ball instead of counting in your head.
Hit Tempo Meter (BPM)
See your hitting frequency in beats per minute and keep your rhythm and intensity dialed in through every drill.
Reaction Metronome
Set a custom target tempo to train footwork speed, hand-eye coordination, and swing consistency — with an acceleration mode that ramps the pressure up.
Consistency & Speed Charts
Session summaries and interactive graphs reveal your total hits, average rally length, max streaks, and estimated calories burned.
Racket Journal
Archive your best sessions, log drill types, annotate string tension or grip notes, and unlock badges for new personal records.
🎯 Try the Reaction Metronome
Drag the slider to set a target tempo and watch the beat pulse — just like pacing a real wall drill.
👊 Try the Rally Counter
Tap the pad on every "hit" — Jokari mocks the audio detector by tracking your streak and live pace.
Built by players, for players.
🎾We're a small team of racket-sport addicts — tennis grinders, squash wall-bangers, padel converts, and table tennis tinkerers — who got tired of solo practice feeling unmeasured and unstructured. So we built Jokari: the training partner that lives in your pocket and listens to every hit.
🎯Our mission is simple: make solo practice count. Wall drills and rebound sessions are where footwork, timing, and consistency are actually forged, and we believe that time deserves real data, not guesswork — so every session moves your game forward with purpose.
📊Jokari gives you a smart audio hit counter, a live rally streak tracker, a tempo-driven reaction metronome, and progress charts that turn scattered practice sessions into a visible improvement curve — all tuned to the specific ball physics of your sport, fully offline.
⚡ Hear every hit. Track every rally. Train like it's game point.
Your sessions stay on your phone. Period.
Jokari: Racket Analytics was built on a simple principle: your training data belongs to you, and only you. The app does not collect, store, or transmit any personal information. Every calculation — including all microphone audio analysis used for impact detection — happens locally on your device, in real time, and is never recorded, saved, or sent anywhere. This policy explains exactly how that works.
01 Information We Collect
We collect nothing. Jokari does not ask for your name, email, location, or any account details, and it does not generate an advertising or device identifier tied to you. There is no sign-up, no login, and no profile — the app simply works the moment you open it.
02 How We Use Information
Because no personal information is ever collected, none is used, analyzed, profiled, or sold. Microphone input is processed instantly on-device to detect the sound signature of a ball impact and is discarded the moment that calculation is complete — it is never converted into a stored recording.
03 Data Storage
Session history, streak records, tempo settings, and journal notes are saved only in local storage on your own device. Nothing is uploaded to a cloud server, and we do not operate any backend database that could receive your training data.
04 Third-Party Services
Jokari does not integrate third-party analytics SDKs, advertising networks, or tracking pixels. No data broker, ad exchange, or external service ever receives information from the app, because none is generated to share in the first place.
05 Data Security
Since all activity is confined to your device and no data leaves it, there is no transmission for anyone to intercept and no remote database for anyone to breach. Your device's own operating-system safeguards protect the locally stored session files.
06 Children's Privacy
Jokari is safe for players of any age because it collects no personal data from anyone, including children. As there are no accounts, forms, or data submissions anywhere in the app, no information is ever gathered that would require parental consent under COPPA or similar regulations.
07 Your Control
You are always in full control of your training history. Since everything lives locally, clearing the app's data or uninstalling Jokari permanently removes every trace of your sessions, streaks, and journal entries — instantly and completely, with no account to close.
08 Changes to This Policy
If our practices ever change, we will update this policy and revise the Effective Date above. We encourage checking back occasionally, though our core commitment — zero data collection — is fundamental to how Jokari is designed and will not change.
09 Contact
Questions about this policy or how on-device audio processing works? Reach our privacy team anytime at privacy@jokariracketanalyticsapp.com.
Let's talk racket analytics.
📬 Got feedback, a feature idea, or a question about your training data? We genuinely love hearing from the players using Jokari — write in anytime and a real human will read it.
⏱️ We typically respond within 24-48 hours — hang tight and we'll get back to you soon.