Everything you have already lived.
Drop in your data exports – iMessage, WhatsApp, Gmail, Calendar, Instagram, Facebook. Years of conversation become legible. People, places, and decisions, pulled out and indexed forever.
Every conversation, every meeting, every email you have ever lived – indexed locally on your Mac. Ask the included chat assistant, or browse it directly. By attention, not surveillance.
On a single machine that belongs to you, not anyone else's cloud.
Drop in your data exports – iMessage, WhatsApp, Gmail, Calendar, Instagram, Facebook. Years of conversation become legible. People, places, and decisions, pulled out and indexed forever.
Put the phone down. Ostler holds the thread – names, promises, the date that matters – so you do not have to. It surfaces what you need when you need it, and otherwise stays quiet.
Conversations, browser sessions – transcribed, distilled into memories, scanned for to-dos, written to your private wiki. Ask the assistant, or search it directly – it fetches the moment you meant.
Warmth, reciprocity, history – stitched across iMessage, WhatsApp, email, calendar, and the conversations you have actually had.
Every meeting, every message, every event – chronological, searchable, in one place.
Questions you'd ask a person who has been paying attention. Answered from your own records – not the internet.
Three quiet check-ins worth sending.
The Stories We Tell Ourselves, by Mishal Husain.
WhatsApp · 12 Feb – over dinner at Lan Kwai Fong.
Sarah Wells – about July dates.
Inbox · Wed 09:42 – marked unread four times.
14 May 2024 · James cc'd you both on a Horizon Capital event invite.
22 March. You sent flowers from Petalo, Sheung Wan.
WhatsApp · 21 Mar 2025 – delivery confirmation forwarded the next day.
It does not pretend to know what you have not told it. That is the unusual thing.
Privacy is not a feature in Ostler. It is the fact of how the system is built. There is nowhere for your data to go because there is nothing waiting to receive it.
Pull the ethernet cable and the system continues to function. Knowledge graph, vector index, language model – all on your Mac. The internet is consulted only for public data, never personal.
Personal data is never transmitted to Creative Machines or any third party. Zero analytics, zero diagnostics. We have no way to receive or read your data.
All Ostler databases are encrypted with your passphrase using AES-256. Without it, the contents are unreadable – even to us.
Hub is your data, Ostler on your Mac, and read-only AI over your snapshot – yours forever. Pro extends Ostler to your iPhone, ingests new iMessage, WhatsApp, email, calendar, Safari and voice data, and delivers daily briefs to iMessage or WhatsApp. Your first 30 days of Pro are included with every Hub purchase.
ChatGPT Plus is $20 a month for a chatbot that knows nothing about you. Ostler Pro is $9.99 for an AI that lives on your hardware and knows everything about you that you have shown it.