Forgot what you owe a reply on? Don’t remember when you last properly checked in with your sister? Can’t recall what you and Pierre agreed at coffee last week? Ostler knows. It is an AI assistant that has every conversation, every face, every meeting loaded in. Ask it anything about your own life. It answers from what it knows about you specifically, not from the open internet. And nothing ever leaves your Mac.
You are drowning in notifications, group chats, email backlog. Thousands of conversations and commitments scattered across a dozen apps. You cannot search them. You cannot connect them. You forget half of them. Ostler brings it all together on your Mac, adds an AI that actually knows your life, and keeps everything private to you. Knows everything. Tells no-one.
When did you last see Sarah? What did James say about that deal? Who introduced you to David? Ask your assistant or look it up in your personal wiki. Instant answers from your own history.
Pre-meeting reminders that tell you what you last discussed, what you promised, and what matters to the person you are about to meet. Walk in ready, not scrambling.
A morning summary on your phone: what is on your calendar, who you are meeting, what you should remember. An evening wrap-up of what happened. Stay on top of your life without trying.
Ostler deduplicates, merges, and enriches your contacts across platforms. The nagging chore you never get round to, done automatically. Everyone you know, resolved and linked.
Never miss another birthday. Never forget an anniversary. Ostler knows the dates that matter and reminds you in advance, not on the day when it is too late to plan.
Ostler runs a local AI model on your Mac. No subscriptions, no usage limits, no cloud costs. Quality depends on your hardware, but it is surprisingly capable.
If you have privacy concerns about Big Tech knowing everything about you, Ostler is the antithesis. You take your data back from them and keep adding to it, all in one place: your home.
Ostler captures and processes your conversations automatically. No more scribbling notes or trying to remember what was said. Be 100% present. It remembers so you do not have to.
Your assistant wades through the communications you cannot keep on top of, helps prioritise the important things, and can respond on your behalf as you, or as your named assistant on its own iMessage or email account.
How much have I already forgotten?
Ostler is for anyone who juggles a lot of relationships and commitments. Founders, executives, consultants, salespeople, community organisers, anyone with a busy social or professional life. If you regularly think “when did I last speak to them?” or “what did we agree?”, this is for you.
It is not for people who live entirely in one messaging app with twenty contacts. If your life fits in your head, you do not need this. If it does not – and for most people over 30 with any professional responsibility, it does not – Ostler gives you the unfair advantage of perfect recall.
Ostler is not a to-do list or a note-taking app. It replaces the combination of:
General AI queries, but with knowledge of your actual life.
$20/mo elsewhereAutomatic summaries, action items, relationship context.
$17/mo elsewhereRelationship tracking with warmth signals, not just a contact list.
$10/mo elsewhereTriage, scheduling awareness, response drafting, daily briefings.
$3,000+/mo elsewhereOstler is $99 once for the Hub, then $9.99/month for Ostler Pro (the ongoing intelligence layer). The Hub comes with the first 30 days of Pro free, so you can experience the full product before you decide. Hub stays yours forever.
You already have the data: thousands of messages, emails, contacts, calendar entries. Right now it is trapped, scattered, and forgotten. Ostler is the system that makes it useful. The question is not “do I need this?”. It is “how much have I already forgotten?”