Models
- Get smarter and cheaper every few months
- Equally available to everyone
- Easily replace one another
A PERSONAL AI WITH A MEMORY THAT BELONGS TO YOU
Models will keep changing. Your memory - stays with you
Years of conversations, decisions and notes in one memory on your devices. It works with any model and makes AI more useful to you, personally, every day.
Free during the beta · discount for beta members · Windows · macOS · Linux · Android · iOS (soon)
- 1Found three years of gifts
- 2From ChatGPT, Claude and your facts
- 3Any model you like - your memory always works
WHAT'S CHANGING
AI gets smarter every month. Your memory is what makes it useful to you
A year from now there will be a model smarter than today's, and everyone will have it. But only the one you give your memory to will know what you're working on, what you've already tried and what you decided.
TodayA few years from now
Your memory
- Grows with every conversation
- Belongs only to you
- Makes any new model useful from the very first request
WHAT'S WRONG?
Three years of conversations with different AIs. Where are they now?
They lock you in
Your ChatGPT conversations don't move to Claude. Switching models means starting from zero and losing years of built-up context
Their memory is a black box
You can't see what exactly they remembered or correct it, and much still has to be explained again in every new chat
You own nothing
Your history sits on the provider's servers and lives by their rules (your chats are used to train models, get reviewed, and so on). For a lawyer, doctor, journalist, writer or founder that's a real problem - a reason not to use AI at all.
They build a file on you
Your AI conversations are the most detailed file there is on you: work, health, money, relationships, plans. The company that stores them can build a profile from them and use it for its own purposes - for advertising, for example.
HOW IT WORKS
Three steps to get started
Your data never reaches a MindDuck server. The app works with local storage that stays protected on your own devices
- 1
Connect a model
Your own key for OpenAI, Anthropic, Gemini, DeepSeek, Mistral or OpenRouter - or local Ollama and LM Studio. Switch models in a moment, not just per chat but for every single request!
- 2
Bring your history
Import your ChatGPT and Claude archives. Years of conversations become memory with fast search right on any of your devices - from your phone to your MacBook. Tested on a base of 6 million words (more than 2,000 chats and hundreds of documents and notes)
- 3
Work with any AI
It already knows your context: for every request MindDuck finds what matters in your chats, documents and facts, and shows where each answer came from
IMPORT YOUR HISTORY
Years of conversations aren't an archive. They're your capital
Export your archive from ChatGPT or Claude and open it in MindDuck. Chats keep their dates and message order, and the assistant draws on them in new conversations - you can continue any of these chats whenever you like, with any model you choose
- ChatGPT and Claude archives
- Dates and message order are kept
- Search by meaning works on any of your devices
- Your archive always stays under your control
MEMORY YOU CONTROL
Every fact is a record you can see, correct or delete
MindDuck keeps confirmed facts about you and your work together with the message they came from and the date. Nothing is remembered in secret, and nothing confirmed disappears on its own.
- Facts with sources and dates
- A topic map for every conversation
- Move a fact to another project in one click
PROJECTS AND DOCUMENTS
Chats, documents and facts, neatly organised for easy work
Turn a move, a novel or a meeting into a project. The assistant reads and edits the project's documents as a tool, with full version history.
- Editable documents with versions and rollback
- Export to Markdown, TXT and PDF
- Smart search works offline, right on the device
MEMORY BEATS PRICE
An affordable model with your memory answers better than the most expensive one without it
When do I need to give notice to my Munich landlord?
In Germany tenants usually have to give three months' notice. But the exact deadline depends on your lease: check the termination clause or send me its text.
from tens of cents to $1 or more per answer
You settled this back in 2023: a one-year lease with the right to leave early if you give the landlord three months' notice. So the notice has to go out by October 31.
Munich lease · ChatGPT · Mar 14, 2023
1-2 cents per answer
Example shortened. The price of an answer depends on the amount of text in the request and the provider's rates. The strongest model is always at hand for the truly hard questions.
WHAT MATTERS MOST STAYS WITH YOU
We can't see your chats. Technically, not just by promise.
MindDuck has no server where your memory could be stored. Each part of the system gets only what it needs, and nothing more.
A model of your choice
- Gets your message and the context you allowed
- Paid with your own key
- Switch any time, your memory stays
Your devices
- Chats, documents, facts, images
- Encrypted with AES-256-GCM
- Search runs on the device, offline
Your Google Drive (more coming soon)
- Syncs your phone and computer
- Sees meaningless bytes, never the keys
- Add a new device: QR code or recovery code
HOW WE'RE DIFFERENT
Your memory works for you. Today and five years from now
Full control over your data
Your memory is stored encrypted on your devices. Every fact, request and document is visible - you can correct or delete it.
Cloud assistantStored with the provider, under their rulesOne base on all your devices
Start on your laptop, carry on on your phone: the same chats, documents and facts.
Cloud assistantA separate history in every serviceSearch across your whole base
MindDuck answers every question with a search across your whole base: chats, documents and facts, right on the device. As the base grows, so does the quality of the answers.
Cloud assistantRemembers in fragments, and only its own
What happens to your memory
TodayIn a yearIn five yearsCloud assistant
Cloud assistantSwitched models - started from zero
Cloud assistantThe service raised its price or shut down - pay more or lose your history
Cloud assistantYears of your conversations work for a corporation: for its models and its advertising. They do you almost no good
MindDuckMindDuckSwitch models even for a single question, your memory stays put
MindDuckPay for models directly, 1-2 cents per answer. And open models get smarter and cheaper every year
MindDuckWhen the AI right on your computer is smart enough, you'll switch off the cloud and lose nothing: it will already know everything you've discussed
When local AI is smart enough, you'll be ready: your memory is already with you
Cloud assistants are ChatGPT, Claude, Gemini and similar services as they come. Comparison as of October 2026.
Programmers know: if you want to understand why your code doesn't work, explain it to the rubber duck on your desk.
Our duck doesn't just listen - it remembers everything, answers and actually helps!
Why did we build this?
I built this AI assistant for myself
I was tired of explaining to AI over and over what I'm working on. And I didn't want years of my conversations to live on someone else's servers. Models change every six months, but what I've discussed with them should stay mine and keep working for me with any new model.
What we believe
- Models will become a commodity. The value is in your context.
- Your memory is your property, not a provider's asset.
- Memory should be transparent: you can see what's in it.
- You can leave at any time and take everything with you.
MindDuck is in beta now. If you want an assistant like this too - let's finish it together!
FIRST USER
How I use MindDuck every day
- 2,099chats in memory
- 6.43Mwords
- 16projects
- Since 2023of history
Ideas and decisions always at hand
In 2023-24 I discussed lots of technologies for my projects in my chats. Now MindDuck reminds me on its own: you've already thought about this, and here's what you decided back then and why
The past works for youA chat that was never in an archive
In 2024 I spent several days discussing an idea for a novel with Gemini. Gemini still has no convenient chat export, so I simply copied the conversation as text (over 50,000 words!) and loaded it into MindDuck as a document. And right away I picked the conversation back up, with all the ideas and finds from that chat
Memory from any sourceResearch never stops
I paste a link to a YouTube interview into the chat. MindDuck takes the video transcript, writes me a summary of the key statements and ideas, and answers questions about the speakers. And it reminds me if I've been interested in these people or ideas before
Memory grows more valuable every day
Dmitriy Klein, the author of MindDuck and its first user
EARLY ACCESS
Everything is free during the beta
Join now: use the full version, tell us what works and what doesn't, and help us make MindDuck what it should be.
- 30 days of the full version for freefrom your first sign-in to the app
- Another 30 days in exchange for your impressionstell us how you like MindDuck
- A discount for beta membersa special launch price - only for beta program members
You'll need a key for an AI model - it takes a couple of minutes, and the app shows you how.
FAQ
Frequently asked questions
ChatGPT and Claude remember things now too. Why would I need MindDuck?
Their memory lives with the provider, works only inside their service and shows you only what the service decided to keep. Switch to another model, and the memory stays behind.
In MindDuck the memory is yours: all your chats, documents and facts live on your devices, and any model answers with them at hand. You can open, correct or delete every fact, and every answer shows where it came from. Switch models as often as every message without losing anything.
How much does it cost to use AI models?
No subscription needed: you connect your own key and pay the provider only for what you use.
Affordable models such as Gemini 3.8 Flash or DeepSeek 4.1 Flash, with memory across all your chats, handle everyday tasks very well. Through OpenRouter that usually comes to under 10 euros a month. For the occasional hard question you can always switch to the strongest model: such an answer costs more, up to 50 cents - 1 dollar, but you pay only for that one.
With a local model in Ollama or LM Studio you can pay nothing at all, and then answers don't need the internet either.
Who can actually see my data?
We see none of the content. We have no server where your chats could end up; the site knows only your account email and your list of devices.
The model provider receives your message and the pieces of memory found for the answer, not your whole base. Under their API terms, major providers generally don't train models on requests. Check your own provider's terms: on OpenRouter some free models follow different rules.
Google Drive, if sync is on, stores only encrypted packages that can't be read.
Full privacy comes with a local model: then nothing leaves your device. What goes where, in detail: Data and privacy.
How do I bring over my ChatGPT and Claude history?
Download the archive from your ChatGPT or Claude settings and import it into MindDuck. The chats show up right away, with their original dates.
Then MindDuck builds the search index in the background. Even on a computer this takes from 10 to 40 minutes or more, depending on the size. You can use the app meanwhile; the imported chats become fully available for search and answers once indexing finishes.
You can keep using ChatGPT as usual and load a fresh archive later: chats already brought over won't be duplicated.
What if MindDuck development stops?
The stable version keeps working: access is checked on the device, without our server. Your data lives on your devices and in your Google Drive, not with us.
You can export everything to HTML at any time - plain pages that open in any browser without MindDuck.