Let’s get you unstuck.

Start a conversation

Open Fouro, type your message, and send. On a keyboard, Enter sends and Shift + Enter adds a new line. Use Stop while an answer is arriving to request that it stop.

• Guest: up to 5 requests per UTC day and 10 per UTC month per browser installation. Keep the tab open; refreshing or closing it clears the conversation.
• Free account: up to 10 requests per UTC day and 100 per UTC month, with saved history and Memory.
• Pro: no Fouro daily or monthly product chat-count limits. Operational request, token, storage, concurrency, and safety limits still apply.

Daily limits reset at midnight UTC and monthly limits on the first day of each UTC month. A request counts once an answer begins, including an answer you stop. Your remaining allowance is shown in the app.

Sign in or manage your account

Use Sign in and complete the email/password or Google option offered by Clerk. The iPhone app may also offer Sign in with Apple. Use the same account across devices to find your saved conversations. After signing in, open Account settings on web or Settings on iPhone for account and session controls. If a sign-in flow fails, return to the sign-in page and retry before starting another session.

To permanently delete Fouro, open Account settings on web or Settings on iPhone, choose Delete Fouro account, and type DELETE MY ACCOUNT. This removes Fouro account data and sign-in identity. It does not cancel an Apple subscription, so cancel an Apple-billed subscription in Apple's subscription manager first if you do not want it to renew.

Find a conversation or manage Memory

Signed-in conversations appear in history. Search the sidebar to find one, or use its trash button to delete it. If history looks empty, check that you used the same sign-in account. Guest chats are never saved to history or Memory and are not imported when you sign up.

Open Memory from the signed-in sidebar to approve or dismiss suggestions, add category and trigger phrases, and review, edit, or delete information you explicitly asked it to remember or chose to save. Signed-in accounts can keep up to 20 memories. They stay saved to your account until individually or collectively deleted; reaching the limit does not silently replace one. Only a small, relevant selection is included in each chat, so Memory is not a complete transcript of everything you have said. Deleted items are removed from the active product view; limited records may remain where needed for security, billing, legal obligations, or reliable operation.

Manage or cancel Pro

Eligible accounts can start one 7-day Fouro Pro trial with a payment method. The charge today is $0. Unless you cancel before the trial ends, Pro automatically renews at $25 USD per month.

Purchased on the web: Select Billing & subscription to open Stripe's billing portal, where signed-in Pro customers can schedule cancellation at the end of the trial or paid period, or resume renewal before that date. You can also review invoices or change payment details there. Stripe emails receipts and invoice PDFs to your verified Fouro account address and sends renewal, expiring-card, failed-payment, refund, and payment-confirmation notices when relevant.

Purchased through Apple: Open Settings in Fouro to restore Pro and to open Apple's subscription manager. Apple displays the localized price, renewal period, and any introductory offer before confirmation. Apple handles payment and refund decisions for App Store purchases; email Fouro support if a verified purchase does not synchronize after Restore purchases.

If you paid but still see Free, check that you are signed in to the account used at checkout. Refresh the app, or use Restore purchases for Apple. If access is still missing, contact support before purchasing again.

If a response will not start or stops early

• If the app is asking about AI processing, review that choice first. Chat requires permission to send your message to OpenRouter and OpenAI.
• If you reached an allowance, wait until the reset shown in the app. A free account has a larger allowance than guest chat.
• If GPT-4o is unavailable or your connection dropped, wait briefly and retry. Fouro does not silently switch models.
• If an answer was interrupted, read the partial answer before sending another request. Usage refreshes after completed or interrupted requests.

If the problem continues, email the visible error and approximate time it happened. You can leave out your prompt and response.