Tessera
Now on iPhone, Android and the web
Your personal AI assistant.
Tell it once and it remembers for you.
Ask it anything. Set a reminder, keep a list, plan your week, build a document or spreadsheet, write a reply to an email, or dig into whatever you are curious about and let it do the research. What it remembers stays with you in a list you can open, change or delete, and the AI answering only ever sees the piece your question needs.
Every assistant claims to know you. This is the one where that memory is yours to keep: take it with you when you switch between the major AI models, instead of starting over with each one.
Free for 10 days, no card required. Works on your phone and in your browser.
Features
The things you would hand to an assistant
It learns about you as quickly as you tell it about yourself and never forgets unless you want it to.
Things it does for you
In a conversation
Memory
On your phone
“Have Tessera remember this.”
The audio was destroyed. There is nothing to play back.
Who was there
After you confirm
Tasks
Ask a panel
Hear more than one answer
You ask once. Two or three of the major models answer separately, and a fourth writes a combined answer. You can open each one.
One question instead of three, and you can see where they agree and where they do not.
On Standard, Pro and Power. Two of the major models on Standard, three on Pro and Power.
Sound familiar?
Right now, you are the one holding everything
Every app you use knows a sliver of you, and none of them share. So the job of holding the whole picture falls to you: which week you are travelling, what your daughter's teacher is called, that you are off meat at the moment, what you already tried and did not like.
You carry all of it, and you type it out again every single time you want help. Whatever any one app does remember stays inside that app, held on their side, and it does not come with you.
"I explain myself every time."
You laid out your situation yesterday. Today it is gone, and you are typing it all out again from the beginning.
"The advice is written for anybody."
You ask a simple question and get a general answer. Useful for no one in particular, least of all you.
"I cannot see what is kept."
Somewhere, something is stored about you. You cannot open it, correct it, or take it with you.
None of that is your fault. Tessera turns it around: one memory, owned by you, that every answer is built on. You put something in once and stop being the one who has to remember it.
See the difference
An assistant that knows you vs. one that does not
Same question. A very different answer. When you ask through Tessera, your assistant already knows you. Watch the same question, asked twice.
Without Tessera
One quick dinner recipe would be Garlic Butter Grilled Chicken. If you don't have chicken, you could always use another meat like pork loin. Do you have these ingredients on hand: chicken, garlic, butter, parsley, salt, pepper?
With Tessera
Since you are avoiding meat this week and you have a race tomorrow, I would suggest pasta primavera. It is quick, full of the carbohydrates you want tonight, and flexible about ingredients. You picked up zucchini at the farmers market. Want a version built around it?
- Serious Eats, pasta primavera
- NYT Cooking, late-summer zucchini pasta
Another example: a gift for Dad
You ask: What should I get my dad for his birthday?
Without Tessera: Here are some popular gift ideas for fathers: a wallet, a smartwatch, a grilling set, a coffee subscription, or a personalized mug. Could you tell me more about his hobbies, his age range, and your budget so I can narrow this down?
With Tessera (which already knows your dad restores vintage radios, that his birthday is June 12, and that you are keeping spending light this month): Your dad restores vintage radios, so skip the generic gadgets. A set of period-correct vacuum tubes or a year of a restoration magazine would land better, and both fit the lighter budget you are keeping this month. His birthday is June 12, so ordering this week gives you plenty of time.
How it works
How Tessera's AI memory works
Built and controlled by you.
Step 1: Build your memory
Tessera starts by getting to know you, the way a good assistant would on day one. Then it keeps learning as you talk, so the memory gets better the longer you use it. Every fact becomes part of one private memory that belongs to you.
Step 2: Ask any AI, with your context attached
Tessera brings your context into every conversation, so the first answer fits your life. Different AIs are good at different things. Switch anytime, and the next one picks up exactly where the last one left off.
Step 3: See, edit, or delete anything
Open your memory like a settings page. See every fact, edit anything, delete anything. If a fact is wrong or you simply want it gone, remove it, and it stops travelling with your questions from that moment.
To be clear about what Tessera is: Tessera is not an AI model. It is an assistant with a memory, and the thinking is done by the major AI models. You pick which one answers, and because Tessera holds the memory rather than the model, it is never trapped inside one company's product.
Memory off
Not every question is about you
Sometimes you want a plain answer. You are looking something up, helping someone else with their problem, or you simply do not want this one on the record. One switch in the message box turns memory off for that conversation.
Nothing goes in
No detail from your memory is added to the question, and it cannot look you up mid-answer either. Both doors close, not just the obvious one.
Nothing comes out
What you say while it is off is never added to your memory. Switch it back on later and that stretch still stays out, permanently.
One conversation at a time
Off by default on every new chat. Turn it on and it stays on for that conversation only. The next one starts normal.
Everything else is unchanged: same models, same conversation, same app. Which means the subscription still stands on its own. Even with memory switched off every time, you have the major AI models in one place, switchable mid-conversation, on your phone and in your browser. Memory is the reason to pick Tessera. It is not the only thing you are paying for.
Memory off means the answer is not personalised and the conversation is not remembered. The question still goes to an AI model to be answered, the same way every other question does.
Why people stay
Four reasons it keeps earning its place
Not a longer list than anyone else. A shorter one that holds up.
The memory is yours, and it travels.
It lives on your account, not inside any AI company's product. Change which model you talk to and it comes with you, with nothing to rebuild.
Get the right answer on the first try.
In our testing, conversations that started with Tessera context reached the same answer using over 50% less of the plan's usage on average, and in fewer back-and-forths.*
See everything. Change anything.
Full visibility into your memory, one fact at a time, with editing and deletion built in. Nothing about you is hidden from you.
Never stuck with one AI.
Multiple leading AI models in one subscription. Switch mid-conversation and the next model picks up with your full context intact.
* Internal 12-run test, July 2026: identical questions asked with and without Tessera context, measured to the same final answer. Results varied by task; savings exceeded 50% on average.
The app
Your assistant, on your phone and at your desk
One place for everything you want it to know about you. Start on your phone, continue at your desk, same memory either way.
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Answers that fit on the first try
A holiday question, answered with your family and your travel schedule already in mind. No setup paragraph, no re-explaining yourself.
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It learns while you talk
Ordinary conversation is enough. Tessera notices what matters and files it away, so you never have to set your context up twice.
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See how well it knows you
A running measure of how much context Tessera can bring, and a list of what it just learned, with an undo on every item.
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Everything it knows, in plain sight
Your memory is sorted into sections you can open and edit. Nothing about you is hidden from you, and empty ones say so.
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Tell it something directly
Add a fact in your own words, upload a document, or paste a link. Tessera works out which section it belongs in.
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Photos and documents come too
Add a picture or a PDF to the conversation and it is kept in your memory, not lost the moment the chat ends.
Also on your computer
Start on your phone. Continue at your desk.
Tessera runs in any modern browser at app.your-tessera.com. Same memory, same conversations, one subscription that works everywhere.
On a Mac, a PC or a Chromebook you can install it as well, so Tessera opens in its own window with its own icon, without a browser tab in the way.
See it in action
Tessera in everyday use
A quiet part of a normal day. No prompts to master, no setup ritual. Just answers that fit, wherever you are.
Privacy
How Tessera keeps your AI conversations private
Private is not a feature. It is the foundation. "Trust us" is not an answer, so here is how it actually works.
We have no ads business
You pay a subscription. That is the entire business model. There is no advertising side of the company, so there is nothing your data could be sold to power.
Revenue: subscriptions. Ad partnerships: none.
You see everything it knows, always
Your memory opens like a settings page. Read every line, correct what is wrong, delete what you do not want kept. Request a full copy whenever you want, or delete the account outright. You never have to wonder what is in there.
Every fact visible. Every fact editable.
Your conversations do not train AI
Tessera never uses your conversations or your memory to train anything of our own. Your questions reach the AI models under business terms, not the consumer versions where what you type can become training data.
Business terms, not consumer terms.
They get the context. They never get the person.
Your question reaches the model with no account behind it, no email address, and nothing that builds up on their side. They are given what is needed to answer well, and no thread to follow back to you.
No account. No email. No profile on their side.
Testimonials
What people say about Tessera
Tessera holds a great deal about the people who use it. Here is exactly how much of it you get to see.
I really don't like to reveal things to sites if I don't have to, but with Tessera, those fears are gone! I can get personalized responses when I want them to save time and money.
– Jack redacted
email: redacted
location: redacted
likes: redacted
favorite food: redacted
upcoming events: redacted
By remembering what I share and learning from our conversations, it gives thoughtful, personalized answers and ideas I wouldn't have come up with on my own.
– Mary redacted
email: redacted
location: redacted
likes: redacted
favorite food: redacted
upcoming events: redacted
Tessera holds all of this. The AI that answers never learns whose question it is. How that works
FAQ
Frequently asked questions about Tessera
What is Tessera?
Tessera is a personal AI assistant for your iPhone and your browser. It remembers your people, your plans and your preferences, and brings them to everything you ask, so the help fits your life. The thinking is done by the major AI models and you pick which one answers. The memory belongs to you: see it, change it, delete it, or request a full copy.
Is Tessera itself an AI?
Not an AI model, no. Tessera is an assistant with a memory, and the thinking is done by the major AI models. You pick which one answers, and because Tessera holds the memory rather than the model, it is never trapped inside one company's product.
Do I need to be technical to use it?
No. If you can use a messaging app, you can use Tessera. There is nothing to configure and no special way you have to phrase things. The whole point is that good answers stop requiring skill.
Who can see my memory?
You, in full. Your memory opens like a settings page, so you can read every line, change any of it, or delete it. When you chat, only the pieces relevant to your question are shared with the AI answering you, on business tiers where conversations are not used to train the models by default.
Does the AI company know who I am when I use Tessera?
They get the context, never the person. Your question reaches the model with no account behind it, no email address, and nothing that builds up on their side. Tessera holds your account and the model does the thinking, so there is no thread for it to follow back to you. How that works.
What if I want something forgotten?
Open your memory, find the fact, and delete it. To remove all of it, delete your account and everything goes with it. You can request a full copy of your data first. Deletion is real deletion, not a hidden archive.
What is Ask a panel?
You ask once. Two or three of the major models answer separately, and a fourth writes a combined answer. You can open each one. One question instead of three, and you can see where they agree and where they do not. On Standard, Pro and Power: two of the major models on Standard, three on Pro and Power.
How much does it cost?
You start with a 10-day free trial. We do not ask for a card to begin it and nothing charges automatically; when it ends you choose whether to subscribe. Paid plans begin at $7.99 per month and are sized by how much you use it. See the pricing page for details. One subscription covers the iPhone app and the web.
Get started
Start being the person who never drops the ball.
Ten days free. Tell it a few things worth remembering, and it takes it from there.