Your whole day,
card by card.

one-by.one is an iPhone app for people who plan with AI assistants. Your AI turns your day into an ordered queue of cards; your phone shows one doable action at a time, with Start, Done, Skip, Dismiss and Undo for mistaken taps. It is on the App Store for iPhone and is for people aged 16 and over.

You can connect any MCP agent that supports remote HTTP and OAuth sign-in, including ChatGPT, Claude, CLI tools and editors. one-by.one supports dynamic client registration and up to three AI connections per account. The Connect page has setup steps. AI services have their own access requirements, terms and privacy policies.

Yes. Tap your usual routines and any habits, and the app makes cards for the part of the day you’re in. Connect your AI whenever you like, and it plans each day around you. A subscription is required.

Launch pricing is US$12.99 per month or US$59.99 per year in the United States. Yearly plan: 14-day free trial for eligible new subscribers, as determined by the App Store. The monthly plan has no trial. There is no free tier. The App Store shows your local price, eligibility and renewal terms. After the trial, a subscription is needed for paid product features and AI connections; existing data remains readable without a subscription.

You can record results with units such as weight, repetitions, distance, duration, volume, energy, nutrients, pages or cups. Records shows today and week totals, and share images are generated on your device.

Calendar sharing is optional and off until you choose calendars. If enabled, the next seven days of event titles, start and end times, and all-day status from selected calendars are shared with your connected AI. Hide event names shows “Busy” instead of event names. Calendar notes, attendees, locations and URLs are not uploaded, and one-by.one does not write to your calendars. Data remains available until the server confirms withdrawal; offline withdrawal is retried when the app reconnects.

We don't routinely look at your content. Operator access to stored data is limited to fixing a problem you report, keeping the service secure, or meeting a legal obligation. Text you write (card titles, notes, interests, memories, calendar event names) is stored encrypted with a key specific to your account. When you delete your account we delete that key; database backups taken before deletion can still contain it until those backups expire, after which the deleted text can no longer be read. When your connected AI reads your plan or records, it receives the saved text its tools return, such as card titles, results and memories; your AI provider’s policies govern its copy, and disconnecting blocks future access but does not erase what it already received.

Cancel your auto-renewing subscription through Apple. Cancel at least 24 hours before the trial or subscription period ends to avoid renewal. Apple handles purchases, renewals, cancellation and refund requests. Deleting your one-by.one account does not cancel an Apple subscription.

Yes, without a list to manage. Your AI writes the tasks; the app shows the next one, with a timer when it has a length.

It is built for people who freeze in front of a long list: you see one task, not forty. It is not a medical app and does not treat ADHD.

Not yet. one-by.one is iPhone only.