Terms of use

What is available now

Mural is an early language-learning app built around spoken conversations. Supported builds offer a guest trial using Mural-provided conversation time, optional sign-in, and the option to use your own OpenAI API key. Learning history stays on your device. Purchases are available only when an eligible build shows an enabled checkout for your location. The Google Play app offers free-trial and personal-key access, with optional one-time minute packs where checkout is enabled. A direct-download Android build may offer separate paid access. The offer shown before checkout applies to your purchase.

The source code is available on GitHub, and the Android preview is available on Google Play. Public TestFlight invitations and an App Store release are still being prepared. An iPhone waitlist request records your interest so we can contact you about availability; it does not guarantee an invitation, a launch date, a place in a queue, or access to future paid features.

Preview features may change as we test them. Any invitation will explain the available build and installation route. Apple controls the operation and eligibility rules of TestFlight and the App Store; Google controls those of Google Play.

Eligibility

You must be at least 18 years old, legally able to agree to these terms, and meet the location and account requirements of the services you use with Mural. Mural does not provide child accounts or a parental-consent route for people under 18.

If you act for an organisation, you must have its authority. Use an email address and API account you control or are authorised to use, and do not submit another person's details to request access without their permission.

Optional accounts

Where an account feature is available, you can sign in with Google or, when enabled for your build, Apple. Complete the provider's sign-in flow using an account you are authorised to use. The sign-in screen links to these terms and our privacy policy before you continue. Signing in creates or accesses your Mural account; requesting access on the website does not.

An account is optional for a supported guest trial or practice with your own OpenAI API key. Signing in can preserve the remaining eligible guest allowance; an account that already claimed a trial does not receive another one by linking a new guest installation. Signing in does not back up learning history or authorise a purchase. Your app lets you view account details, sign out and initiate account deletion.

Keep your device and provider account secure. You may need to sign in again when a Mural session expires or is revoked. Provider access and eligibility rules still apply. If you cannot access your provider account, use that provider's recovery process; contact us about any Mural records you need help with.

AI conversations and learning estimates

Mural's voice is generated by AI. It may misunderstand you, give an inaccurate correction, translate a phrase incorrectly, pronounce a word poorly, or present an unreliable fact. It can also produce unsuitable or biased content. Check important information against a reliable source.

Conversation difficulty, level estimates, and word-confidence bars are learning aids based on limited evidence. They do not certify proficiency or predict exactly what you will remember. We do not promise a particular learning outcome or a date by which you will no longer need Mural.

Use Mural for language practice. It is not a source of professional medical, legal, financial, or emergency advice. Discussion of a current event does not mean Mural has verified every claim or endorses a linked source.

Conversation time, purchases and your API key

The current guest offer is 10 minutes where available. The amount shown when you claim an offer applies to that grant. We can change or pause new trial grants to manage costs; this does not remove time already granted. Free time is intended for an eligible first trial, and reinstalling or creating accounts to bypass that limit is not permitted.

Free time is measured as connected conversation time, including listening and pauses. Each successfully created hosted conversation has a 15-second minimum, capped at the remaining free allowance if less than 15 seconds remains. A failed connection or delayed usage confirmation may leave time reserved while the service reconciles the request. Ending a conversation does not necessarily cancel teaching work already submitted.

When purchases are offered, sign in and choose a one-time pack of Mural minutes. Some checkouts let you buy 1–10 copies of one pack; Google Play sells one pack per checkout. The quantity and total price appear before you approve payment. These are not subscriptions, and Mural does not automatically top up your balance. Prices and availability can differ by payment channel and storefront. The checkout shows the applicable currency, tax and final total.

Paid and combined minute balances are approximate and rounded down to whole minutes. Actual AI voice and teaching usage determines how quickly purchased value is spent; a displayed estimate is not a guaranteed conversation duration. Mural retains its 15% service fee on the underlying AI allocation. The app shows remaining minutes and purchase prices, without an internal cost breakdown. The 15-second provider minimum applies to successfully created paid voice sessions. Purchased value does not expire.

Eligible free time is used first. A conversation can pause when that allowance ends while its usage is settled; you can then continue with purchased minutes when the app confirms they are available. A temporary reservation can make some minutes unavailable until a conversation or teaching request settles.

In an enabled iOS build, Apple processes in-app purchases through the App Store. Its confirmation sheet shows the final purchase. For Apple charges and refund requests, use Apple’s purchase support. Apple’s applicable terms and mandatory consumer rights apply. A purchase can take time to verify before minutes appear. Use Check purchases in Account to retry interrupted delivery; Mural credits each verified purchase once.

In an enabled Android build from Google Play, Google Play Billing processes the in-app purchase. Its confirmation sheet shows the final price. For Google Play charges and refund requests, use Google Play’s refund request or contact us for Mural balance and delivery help. Google Play’s applicable terms and mandatory consumer rights apply. A purchase can take time to verify before minutes appear. Use Check purchases in Account to retry interrupted delivery; Mural credits each verified purchase once.

Your remaining Mural minutes belong to the Mural account used for checkout and can be used on supported devices signed into that same account. Matching email addresses alone do not join separate accounts. Where offered, connecting another sign-in provider requires fresh sign-in and confirmation. Learning history remains on each device. Sandbox test purchases provide test value only and cannot fund production use.

Website purchases require a code sent to the verified email already shown in your Mural Account screen. Use that address, including an Apple relay address if shown. Checkout is available only when the address identifies one active account. This verification does not create an account or merge separate accounts. The checkout shows the final charge, including any taxes. Returning to the website does not establish that payment succeeded; minutes are added after the payment provider confirms the purchase.

Where checkout identifies the purchase as “Sold through Link”, Stripe provides Managed Payments and Link is the merchant of record for that transaction. Link handles the payment, applicable transaction taxes in its covered jurisdictions, receipts and transaction support under the terms shown at checkout. Hackmamba Inc. continues to operate Mural and provide app support. Payment availability depends on your location and build; an available preview does not guarantee paid access in that location.

For a Sold through Link purchase, contact Link support about a charge or refund. You can also email hi@hackmamba.io for help with Mural or your remaining balance. The checkout terms and mandatory consumer rights apply. Opening or closing checkout, or requesting account deletion, does not establish whether a payment succeeded or was refunded. Confirmed refunds and payment reversals are reflected in the associated Mural balance; a refund request alone does not create a refund.

If you choose your own OpenAI API key, OpenAI bills your provider account for use. Voice conversations, meanings, word explanations, topic research and learning review can incur charges. You are responsible for that account, its budget and your key. Provider usage records and billing terms determine those charges. Internet and mobile-data charges may also apply.

Requesting access, claiming a free offer or creating an account does not authorise a payment. OpenAI, Google, Apple and payment services have their own terms, availability and privacy practices.

Using Mural responsibly

You may use Mural for lawful language practice. You are responsible for having permission to share the information you submit and for using generated content lawfully.

Do not use services we operate to commit fraud, invade someone's privacy, send malicious software, gain unauthorised access, disrupt infrastructure, or bypass access controls and usage limits. Do not submit stolen credentials or repeatedly send false access requests.

These rules protect our operated services. They do not prevent you from studying, modifying, testing, redistributing, or running your own copy of the source code within the permissions of its open-source licence.

Your content and local data

You retain the rights you have in the material you provide. You allow the processing needed to carry out a feature you request, such as sending speech to OpenAI for a reply or sending a support message to us. This permission does not give us ownership of your conversations or permission to sell them.

The AI provider's applicable terms also govern inputs and outputs processed for your conversations. Generated material may be similar to material produced for someone else; we do not promise that it is original or that it qualifies for copyright protection.

Your learning history is held locally. We cannot recover a lost device archive from a Mural server. Use the app's export function if you want a separate copy, and protect exports that contain private conversations. Importing an archive or deleting learning data can replace or remove information on the device.

Open-source software and the Mural name

Mural's published source code is available under the MIT licence. That licence governs your use, modification, and distribution of the covered software. Third-party components remain subject to their own licences and notices. These terms do not take away permissions granted by those licences.

An open-source licence does not provide a right to use our servers, credentials, or customer information. It also does not grant trademark rights or permission to present an independently operated copy as the official Mural service.

You can report bugs or suggest changes through GitHub or support. Do not include private conversations or API keys in public issues. Code contributions are governed by the repository's contribution terms.

Availability and changes

Mural depends on an internet connection, supported devices, and third-party AI services. Features can be interrupted by maintenance, technical failures, provider changes, or loss of API access. We may improve, replace, or withdraw preview features and will give reasonable notice of material changes where practical.

We do not guarantee uninterrupted operation or compatibility with every device or future provider change. Keep a backup of learning data that matters to you. If we stop operating a service, that does not remove the licence permissions you already have for copies of the published code.

Stopping use or restricting access

You can stop using Mural at any time. You can withdraw an access request by emailing support and use the app's controls to remove local data or your API key. Removing the key in Mural does not revoke it with the provider.

You can initiate account deletion from the Account screen or our account-deletion support page. Automatic deletion can complete when there is no unresolved billing; it forfeits unused promotional time after your confirmation. Support can receive a request when a balance, active conversation, Apple-linked account or pending payment needs review. We verify ownership and explain the steps needed to complete deletion. A request does not itself forfeit paid value or cancel a purchase. After deletion, local learning history remains until you remove it separately, and limited records may be retained for the purposes described in our privacy policy. Deleting Mural does not delete your Google or Apple account.

We may restrict access to services we operate when reasonably needed to address abuse, a security threat, a legal requirement, or a material breach of these terms. We will explain the reason where practical and lawful. You can contact support if you believe we made a mistake. A restriction on our hosted services does not cancel rights granted by the MIT licence.

Our responsibility to you

We provide the current preview as available. To the extent the law allows, we do not give additional warranties that it will be error-free, always available, or suitable for a particular purpose. The separate warranty terms in the MIT licence apply to the software distributed under that licence.

Nothing in these terms excludes responsibility that cannot legally be excluded, or takes away mandatory consumer rights and remedies. This includes any non-excludable rights concerning digital services, reasonable care, misleading statements, or loss caused by unlawful conduct.

If you have a complaint, contact hi@hackmamba.io and explain what happened. Contacting us is not a condition of exercising a legal right. These terms do not require arbitration, waive class or collective rights, or prevent you from bringing a claim in a court available to you under applicable law.

Updates to these terms

We may update these terms as Mural changes or legal requirements develop. We will show the updated date and provide notice of material changes before they take effect where required. A change needing your agreement will be presented for that agreement. Urgent changes needed for security or legal compliance may take effect sooner, with notice as appropriate.

If a provision cannot be enforced, the remaining terms continue to apply so far as the law allows. These terms do not replace separate rights or obligations under an open-source licence or a third-party service agreement.