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, WhatsApp groups, 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? Stop digging through old messages – ask your AI 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 to remember.
A morning summary on WhatsApp: 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. That nagging chore you never get round to? Done automatically. 1,800 people, 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 anything.
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. No more $20/month to ChatGPT for things your own machine can do.
If you have any privacy concerns about Big Tech knowing everything about you – and you should – Ostler is the antithesis of that. You take back your data from them and keep adding to it, all in one place: your home.
Ostler captures and processes your conversations automatically. No more scribbling meeting notes or trying to remember what was said. Be 100% present in the moment – it remembers so you do not have to.
Marvin wades through the communications you cannot keep on top of, helps prioritise the important things, and can even respond on your behalf – either as you, or as your named assistant on its own email, iMessage, or WhatsApp account.
Contextual support when you need it: reminders of key information before you say the wrong thing, flags for anything not quite accurate, and suggestions based on what Ostler knows about the person you are talking to.
An optional feature that analyses your communication patterns and spots things you might not have noticed – habits that could hold you back, relationships that need attention, and opportunities you are missing. A coach that knows your actual behaviour, not just what you tell them.
Every meeting transcribed, summarised, and linked to the people involved. Action items extracted and tracked. No more "can you send the notes?" emails – they are already in your wiki.
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:
ChatGPT / Claude ($20/mo) – general AI queries, but with knowledge of your actual life.
Meeting notes tools ($17/mo) – automatic summaries, action items, relationship context.
Personal CRM ($10/mo) – relationship tracking with warmth signals, not just a contact list.
The PA you cannot afford ($3,000+/mo) – triage, scheduling awareness, response drafting, daily briefings.
Ostler costs $24.99/month after a one-time $49.99 Hub purchase. The Hub comes with a free month, so you can try everything before you commit.
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?"