The rules for using Rallo.

What Rallo is

Rallo is a tennis-coaching app and web companion. You film a practice session on your iPhone and get a coaching report that you can review on your phone or, when you choose, in Studio. The app is built and operated by Andrey Esipov ("Rallo", "we", "us"). Contact: support@rallotennis.com.

By using the website or app, joining the waitlist, creating an account, starting a trial, or purchasing a subscription, you agree to these Terms. If you don't agree, don't use Rallo.

Who can use Rallo

Rallo accounts and recorded-player profiles are available only to players age 13 and up, or the higher minimum age required in their country. Coach and guardian accounts may connect only to a player who independently meets that minimum. If you are under 18, you confirm that a parent or guardian agrees to these Terms on your behalf where required.

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 carry uncertainty. Everything Rallo reports is computed from a phone video and carries either a target band or a qualitative read, plus the capture conditions it depends on. Those targets are design targets: no measurement has yet been checked against a calibrated instrument or an independent human annotation, and Rallo does not display an error band it cannot support. We publish those limits on the Trust page and hide a metric when its conditions are not met.

Your account and sign-in

You may create a Rallo account with email and password, Sign in with Apple, or Sign in with Google where offered. You are responsible for keeping your sign-in secure and for telling us promptly if you believe someone else has access. We never receive your Apple or Google password.

You can schedule account deletion from Settings or by contacting us. A deletion request immediately blocks new writes, stops renewal where Rallo controls it, keeps private reads available through the latest verified subscription access date, and then purges the account and account-linked cloud data. Apple subscriptions must also be canceled through Apple. See the Privacy Policy for retention details.

Subscriptions and payment

Rallo offers one Pro subscription, billed monthly or yearly. There is no ongoing Free tier.

• Trial. An eligible account may receive one 14-day trial. Creating an account does not start it. Stripe or Apple must confirm the trial and its required payment method.
• Auto-renewing. Pro renews automatically at the end of each billing period unless you cancel with the provider that billed you.
• Provider management. Manage a web purchase through Rallo's Stripe portal. Manage an iPhone purchase through Apple subscription settings. Rallo does not receive your full card or bank details.
• Pricing. Current prices and billing periods are shown before you subscribe. Provider notices and applicable law govern price-change consent.
• Refunds. Refunds are handled under the billing provider's policies and any rights required by law.
• Access after Pro. When verified Pro access ends, existing private sessions remain available to open, download, export, delete, and revoke. New analysis, upload, sharing, comments, and coaching activity become unavailable.

Your content

You own your clips and reports. The videos you record and the reports Rallo generates remain yours. By default, practice clips stay on your device.

If you save a clip to your cloud library, upload it to Studio, share a session, or attach it to a support request, you grant Rallo the limited permission needed to store, process, and transmit that content only to provide the feature you chose. We do not use your clips to train models for anyone else, sell them, or show them to anyone except the people you share them with. You can revoke a share link. 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, including Replit for website, API, and database hosting; Cloudflare for object storage and compatibility Worker flows; Resend for transactional email; Stripe for web billing; Apple for App Store billing and Sign in with Apple; and Google for Sign in with Google where offered. Your use of those services is also governed by their terms and privacy policies. 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 and schedule account deletion at any time. A deletion request immediately makes the account read-only, schedules Stripe cancellation at period end where applicable, and requires you to cancel any Apple subscription through Apple. Private data remains available through the latest verified access date and is then purged, subject to the limited retention in the Privacy Policy. We may suspend or end 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, including ownership, payment obligations, 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 1.1, effective July 11, 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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