The rules for using Rallo.

What Rallo is

Rallo is an iOS app that watches your tennis practice and tells you the one thing to work on next session. You prop your phone on the fence, play, and get a short coaching report afterward. The app is built and operated by Andrey Esipov ("Rallo", "we", "us"). Contact: support@rallotennis.com.

By downloading, installing, or using Rallo, you agree to these Terms. If you don't agree, don't use the app.

Who can use Rallo

Rallo is built for tennis players age 13 and up. By using it, you confirm you are at least 13 years old. If you are under 18, you confirm a parent or guardian agrees to these Terms on your behalf.

A future version may add a Pediatric Mode for ages 8–12 with a separate parental-consent flow. Until that ships, Rallo is for ages 13 and up.

What Rallo is — and is not

This is the most important section. Read it.

Rallo is a technique-feedback tool. It reads how your body moves through a swing from a phone video and describes what it sees in plain, body-relative terms — "contact a little further in front of your hip," "load deeper into your legs." It is a coaching aid for recreational and coaching use.

Rallo is not medical advice. Rallo is not a doctor, a physical therapist, or a diagnostic tool. It makes no medical, injury, or health claims. Nothing Rallo shows you is a diagnosis, a treatment, or a substitute for professional medical or physiotherapy advice. If you feel pain, stop and see a qualified professional. Tennis is a physical activity; you play at your own risk.

Rallo is not a line judge or a scorekeeper. Rallo deliberately does not call shots in or out, does not mark where a ball landed, does not place shots on a court diagram, and does not print a swing speed in mph. It describes the swing, not the outcome of the point. Do not use Rallo to settle line calls, scores, or any competitive dispute.

Rallo is not a guarantee of results. Rallo describes what it observes and suggests what to work on. It cannot promise you will improve, win matches, avoid injury, or reach any particular level. Improvement depends on you. The feedback is informational; how you use it is up to you.

Rallo's observations are estimates. Everything Rallo reports is computed from a phone video and carries an error band. We publish those bands openly on the Trust page. Treat Rallo's output as a knowledgeable second opinion, not a precise instrument.

Your account and sign-in

Rallo's core coaching flow runs on your device and does not require an account. If you choose to sign in — for example, to manage a shared report — Rallo uses Sign in with Apple (and, where offered, Sign in with Google). You are responsible for keeping access to your Apple or Google account secure. We never see or store your password.

You can delete your account at any time from the app's Settings (Settings → Account → Delete Account). Deletion wipes your sessions and profile from the device and, where applicable, removes your install record from our servers. See the Privacy Policy for what we store and how deletion works.

Subscriptions and payment

Rallo offers a Free tier and a Pro subscription.

• Auto-renewing. Pro is an auto-renewing subscription. It renews automatically at the end of each billing period unless you cancel at least 24 hours before the period ends.
• Managed by Apple. Payment is charged to your Apple ID account through Apple's In-App Purchase system. We never see your card or bank details — only that your subscription is active.
• Cancel through the App Store. You manage and cancel your subscription in the App Store (Settings → your Apple ID → Subscriptions on your device), not inside Rallo. Cancellation takes effect at the end of the current billing period; you keep Pro until then.
• Pricing and tiers. Prices, tiers, and what each tier includes are shown in the app before you subscribe and may change over time. If we change a price, Apple notifies you and asks you to confirm before the next renewal where required.
• Refunds. Purchases are handled by Apple, so refunds are subject to Apple's policies. Request refunds through Apple, not Rallo. Where the law gives you a refund right, that right still applies.
• Free trials. If a free trial is offered, any unused portion is forfeited when you buy a subscription, per Apple's standard terms.

Your content

You own your clips and reports. The videos you record, the data Rallo extracts, and the reports it generates are yours. By default, everything stays on your device — it does not leave your phone.

If you opt into a backup, share a session, or attach a clip to a support report, you grant Rallo a limited license to store, process, and transmit that content only as needed to provide the feature you asked for (for example, to host a share link or to investigate a support issue). We don't use your clips to train models, we don't sell them, and we don't show them to anyone except who you share them with. You can revoke a share link at any time, which removes the shared copy. See the Privacy Policy for details.

You are responsible for what you record. Only film yourself, or people who have agreed to be filmed, and only where filming is allowed.

Acceptable use

Use Rallo for its intended purpose — coaching your own (or your students') tennis. Don't:

• break the law, or use Rallo to harm, harass, defame, or invade the privacy of anyone;
• record people without their consent where consent is required, or in places where filming is prohibited;
• reverse-engineer, decompile, or extract the app's models or code, except where the law expressly allows it;
• probe, scan, or attack our backend, abuse share links, forge install identifiers, or try to get around rate limits or security controls;
• resell, sublicense, rent, or commercially redistribute the app or its output without our written permission;
• upload content that is illegal, infringing, or that you don't have the right to share;
• use Rallo to make medical, safety, officiating, or in/out-of-bounds determinations.

We may suspend or end your access if you break these rules.

Intellectual property

Rallo — the app, its software, models, design, brand, wordmark, and content we provide (including the pre-loaded reference sessions) — belongs to us or our licensors and is protected by intellectual-property law. We grant you a personal, non-exclusive, non-transferable, revocable license to use Rallo on devices you own or control, for your own non-commercial coaching use (teaching pros may use it with their students). These Terms don't transfer any ownership in Rallo to you.

Rallo is built on third-party and open-source components, each under its own license. "Apple", "App Store", "Sign in with Apple", and related marks are trademarks of Apple Inc., used here for identification only.

Third-party services

Rallo relies on services we don't control — Apple (App Store, In-App Purchase, Sign in with Apple), Google (Sign in with Google, where offered), and Cloudflare (backend and storage). Your use of those services is also governed by their terms and privacy policies. We're not responsible for third-party services, and their availability is outside our control.

Changes to the app

Rallo is in active development. We may add, change, or remove features, including features behind the Pro tier, and we may update the app at any time. We may also stop offering the app, or parts of it, with reasonable notice where practical.

Disclaimer of warranties

Rallo is provided "as is" and "as available", without warranties of any kind, whether express or implied. To the fullest extent the law allows, we disclaim all implied warranties, including merchantability, fitness for a particular purpose, accuracy, and non-infringement.

We do not warrant that Rallo will be uninterrupted, error-free, or secure; that its observations will be accurate or complete; that defects will be fixed; or that using Rallo will improve your tennis or prevent injury. You use Rallo at your own discretion and risk.

Some jurisdictions don't allow certain warranty exclusions, so some of the above may not apply to you. In that case, the disclaimers apply to the maximum extent the law permits.

Limitation of liability

To the fullest extent the law allows, Rallo and its operator will not be liable for any indirect, incidental, special, consequential, or punitive damages, or for any loss of data, profits, or goodwill, arising out of or related to your use of (or inability to use) Rallo — even if we've been told such damages are possible.

To the fullest extent the law allows, our total liability for any claim relating to Rallo is limited to the greater of (a) the amount you paid us for Rallo in the 12 months before the claim, or (b) USD $50.

Nothing in these Terms limits liability that can't be limited by law — for example, for death or personal injury caused by our negligence, or for fraud. Some jurisdictions don't allow certain limitations, so some of the above may not apply to you.

Indemnity

To the extent the law allows, you agree to cover and hold us harmless from claims, losses, and costs (including reasonable legal fees) arising from your misuse of Rallo, your violation of these Terms, or your violation of someone else's rights — for example, filming someone without their consent.

Termination

You can stop using Rallo at any time by deleting the app and, if you have one, your account. We may suspend or end your access if you break these Terms or use Rallo in a way that harms other users or us. Sections that by their nature should survive termination — ownership, disclaimers, limitation of liability, indemnity, and governing law — survive.

Changes to these Terms

If we change these Terms, we'll update this page and the "Effective" date at the top. For material changes, we'll give notice in the app before they take effect where practical. Continuing to use Rallo after a change means you accept the updated Terms. If you don't agree, stop using Rallo.

The current version is 1.0, effective June 3, 2026.

Governing law

These Terms are governed by the laws of the State of Tennessee, United States, without regard to its conflict-of-laws rules. Any dispute will be resolved exclusively in the state courts located in Williamson County, Tennessee, or the federal courts of the Middle District of Tennessee, and you and we consent to that venue.

Nothing in this section takes away any mandatory consumer-protection rights you have under the law of the country where you live.

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