Five minds. One portfolio. Zero noise.
Five minds
A portfolio
Zero noise
Ask in plain language. Elisa puts it in circulation across the team and Cerebro answers with sources, limits and cost. And it gives a verdict, not an «it depends».
History of this desk
Elisa is an artificial intelligence, not a person. Her answers are generated by an AI model.
This is general analysis and not a personalised investment recommendation. The person who invests is the one who decides. The chat may search the internet when the vault does not know the answer (a figure from today, a recent news item); those internet sources nobody has reviewed them and they may be incomplete or wrong, so check them before acting. The five profiles that sign the answers (Elisa, Jorne, Carlos Bárez, Daniel Ferrer, Inés Torres) are specialisms of one single automatic system: they are not people nor registered advisers.
Tools
Note down your positions and watch how they do. Without an account they are stored only in this browser; with an account, they sync across devices.
What leaves your browser
When you ask in the chat, the text of the question and the history of that conversation are sent. If you have saved reading preferences, the vocabulary level and the depth are sent too. Your saved positions they are not attached to the chat; the portfolio and the scenarios use them in their own sections. That is why answers are general and not personalised: Cerebro is not financial advice. Avoid writing personal or financial data that is not needed. The securities search sends the search text and price queries send the symbols. See the privacy policy to find out which providers there are and what else is used.With your session signed in, positions are are stored in your account: they sync across devices and are deleted with the account. Type the name or the ticker and pick from the list so we know exactly which security it is and which exchange it trades on.
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One position per line: TICKER [shares] [price]. The comma works as a decimal point. Repeating a ticker updates it.
Your portfolio starts with one position. Add a security at the top and, if you want, the shares and the entry price.
Scenarios
Two hypothetical accounts with the assumptions you set. They do not predict the market nor rely on your portfolio: they show what what you type implies. If a figure is missing, the screen says: n/a and why. Never a zero that can be read as data.
Search by title or subject; not inside the notes.
Mortgage and housing
Review of a variable-rate mortgage
What payment is left after a review of a variable-rate mortgage, how much it changes with respect to the one you had, and what official Euríbor was published twelve months ago.
What it does
It starts from the outstanding capital and the term remaining for you, and applies the spread you have agreed. With that it calculates two payments: the one you would pay with the Euríbor at your last review and the one you would pay with the new one, on the same numbers. The difference is what the review changes for you, and it is stated per month and over twelve months.
The new Euríbor comes by default with the latest official value published by the Banco de España, with its month on the field label. You can change it to the one your review applies. The detail adds the official Euríbor value from twelve months ago, with its month, so that you can see what it is being compared against. All of that data is on the [Euríbor](/euribor) page.
With the default values —150.000 € outstanding, 240 months, a spread of 0,7 and an Euríbor going from 3,5 to 2,954— the previous payment was 924,86 € and the new one comes out at 881,86 €. That is 43,00 € less per month and 516,00 € less over twelve months.
Key concepts
- Outstanding capital: what remains to be paid, not what was originally requested. If you have prepaid, it is lower, and that is why both payments also fall.
- Remaining term: the months left, not the total years. It is the term remaining at the date of the review.
- Spread: the points your lender adds to the Euríbor. It is in the contract and does not change at the review, so it goes into both payments equally.
- Official Euríbor: the monthly reference rate published by the Banco de España. What gets reviewed is the Euríbor, and the spread is maintained.
- A single review: the page calculates this review and not the ones that follow. Knowing what will happen in six months would require inventing an Euríbor that does not exist yet.
Frequently asked questions
Why is the new payment not the previous one plus the change in points?
Because the payment is not a proportional share of the capital. The monthly payment comes out of the French formula, with the monthly interest rate divided by twelve, and that is why moving the Euríbor three points does not move the payment in the same proportion as the rate. The account uses that formula, the same one the rest of the site's calculators use.
What happens if the new Euríbor falls below zero?
The spread is added and, if the combined rate comes out negative, the account is done at 0 % and the detail warns you of it. A payment with negative interest would return more capital than is outstanding, which is a loan that pays itself: it is not a real contract case, but a limit of the model, and that is why it is stated instead of producing a strange number.
And if my review also changes the spread?
This page does not contemplate that: the spread goes in as a single number in both payments. If your spread has also been changed, type the new one in the field and the previous payment will come out calculated with that same value. The difference between the two will still be the effect of the Euríbor, which is what you want to isolate.
Does it calculate the payment for the following months?
No. Only the new payment from the review onwards. The following reviews depend on Euríbors that have not yet been published, and a projection of that would be an invented figure shaped like data. The page does not do it.
Do my mortgage numbers come from here?
No. The five fields are calculated in the browser, they are not sent anywhere, they are not stored, and they can be copied into the address to return to the same account. There is no sign-up and no user account.
Is this official data or an estimate?
No. It is an account built on the numbers you type: the outstanding capital and the term are yours, and the spread and the two Euríbors are those of your contract. The only official data on the page is the value that appears by default, and it comes from the Banco de España. The decision about your mortgage is yours, and so is the enquiry to your lender.
Related calculators
Mortgage payment
The monthly payment on a mortgage loan and its amortisation schedule, month by month, with your own data. Free and with no sign-up.
Fixed or variable mortgage
Two payments on the same loan, one at the fixed rate you type and another at the official Euríbor plus the spread, with the cost difference over the whole term. Free, no sign-up.
Paying off a mortgage early
How much money you save by paying off your mortgage early, whether you cut the payment or shorten the term, with the legal cap on fees. Free and with no sign-up.
Your account
Your portfolio and your saved notes, also on your other devices. Without an account you can keep using the portfolio in this browser. When you delete your account, the associated data is deleted too.
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Adjust how we explain it to you
Two optional questions: your vocabulary level and your preferred depth. They are used to adapt the explanation. We do not ask about amounts of money and we do not run a suitability assessment. The answers are generated by the system and may contain errors; these preferences do not guarantee that the result is identical in every case.