A tutor that makes them think. On the phone or tablet they already have.
LEXA is an AI tutor for ages 12 to 18 that never hands over the answer — it asks until your teenager gets there. The free tier runs entirely on the device: no internet, no account, nothing leaves the tablet.
Private beta, September–October 2026, Android. Places are limited — around one hundred students in the first group.
Giving the answer is the easy part. We took it out.
A student who gets the answer handed over has finished the homework and learned nothing. LEXA is built around the opposite constraint.
It asks, then waits
Every reply is a question sized to the next step. If the student is stuck, the question gets smaller — never the answer bigger.
Insisting doesn't work
Ask three times, ask angrily, ask in capitals. The tutor holds. When a model gives in under pressure, we log it as a defect and fix it.
Aligned to the real syllabus
Content follows the Spanish national curriculum (LOMLOE, RD 217/2022), year by year and subject by subject. Other curricula follow.
The free tier runs on the device. That is the whole idea.
We think the future of everyday AI is local. Not as a slogan: as an architecture with five consequences you can check.
By architecture, not by policy
What never leaves the device cannot be leaked. A minor's questions stay on the tablet. It is a property of the system, not a promise in a document.
Zero per user
No inference bill. It is the only thing that makes a genuinely free product possible, rather than a trial with a clock on it.
Works with no internet
The difference between serving every student and serving the ones with good broadband. Our tablet benchmarks were run in airplane mode.
No datacentre per question
The energy cost is the device the student already has in hand. Nothing is spun up on the other end.
Nobody's pricing policy
An open model on a device depends on no provider. Our next step is making that model European.
The edge has a ceiling, and we have measured it: twenty seconds to read a long passage on a €120 tablet, and a 2-billion-parameter model does not reason like a 40-billion one. That is why LEXA is hybrid — local by default, cloud when it is needed — and why we spend our effort on the side that gets better every year.
Three ways to use it. One of them is free for good.
Not a trial. The free tier runs on the device, so it costs us nothing to serve — which is why it stays free. Anyone can connect an API and build the paid tiers. The free one is the part nobody else does.
- Runs entirely on the phone or tablet
- Works with no internet at all
- Conversations never leave the device
- Full Socratic tutoring, every subject, 1º ESO to Bachillerato
- Any number of student profiles
- Faster, stronger cloud model
- Interactive exercises and quizzes
- Photo a problem, get guided through it
- Family view of what they're working on
- Real-time voice conversation with Lexa
- Shared whiteboard the tutor draws on while talking
- Personalised exam preparation
- Everything in PLUS
Under the hood, for the technically curious.
The free tier is the hard engineering problem: a full tutoring pipeline, with speech in and out, inside 8 GB of RAM on a mid-range device. Here is what that looks like measured.
tokens per second on a €120 tablet, fully offline — and 41.2 on a 2026 flagship, same model and runtime
CPU beats GPU on the €120 tablet. On the flagship it inverts and GPU wins by 1.5×. The best backend is a property of the device
bytes of student data sent from the free tier, and zero student data used to train any model, on any tier
infrastructure cost at scale versus a cloud-only design, modelled at one million users
Privacy, plainly.
Our users are minors. These are the commitments, written so a parent can check them.
The model runs locally. There is no server on the other end to send anything to.
Not on the free tier, not on the paid ones. This is a design decision, not a setting.
Cloud inference for voice and text is being consolidated in an EU region ahead of public launch.
The family view is visible to the student. No hidden monitoring.
Where we are, honestly.
We would rather tell you the real stage than a rounded number. Here it is.
Want your teenager in the beta? Places are limited.
We're looking for families with students in 1º ESO to Bachillerato who will use it for real and tell us what breaks. Write to us and we'll send the details.
Blyzai, S.L. is based in Barcelona. LEXA is developed with technical advisory from the BSC AI Factory and takes part in Google for Startups. We are a small team and we say so.
Questions parents ask.
How is this different from ChatGPT?
ChatGPT is built to answer. LEXA is built to teach, which means it will not give the answer even when asked repeatedly. It also follows the actual school curriculum, and the free tier keeps everything on the device.
What happens if my child just asks for the answer?
The tutor breaks the problem into a smaller question. If they keep pushing, it keeps asking. We test this on purpose, and when a model gives in we treat it as a bug.
Is the free tier really free?
Yes, and it stays free. It runs on your device, so serving it costs us nothing. The paid tiers add a stronger cloud model and voice.
What data do you collect?
On the free tier, none: there is no server involved. On paid tiers, the conversations needed to run the service, processed in the EU, never used to train models. Full policy on the privacy page.
Which subjects and years?
Every subject, from 1º ESO to 2º Bachillerato, following the Spanish national curriculum (LOMLOE, RD 217/2022).
Free. Offline. Built to make them think.
No account, no card, no internet needed. The first beta group is small — ask for a place before it fills.