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Ustad is a whole school on your phone or computer: the official textbooks, page by page (Mathematics for grades 10 to 12 and Physics for grades 10 and 11 today, more on the way), and a patient AI teacher you can chat with or talk to. It keeps working without the internet.

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Ustad

Lesson 2.3 · Isotopes

What is an isotope?

Atoms of the same element with a different number of neutrons. Like two bags of rice from one field: one is a little heavier.

From your lesson · Chemistry 12 · 2.3

Quick check

Which has more neutrons?

Carbon-12

Carbon-14

Ask anything…

The real textbooks. Page by page.

The official Ministry of Education textbooks, page by page, with short lessons, examples and practice. In the app today: grades 10 to 12 Mathematics and grades 10 and 11 Physics. The books marked “Coming soon” are being prepared.

$Cover of the grade 10 Mathematics textbook$

Mathematics

ریاضی صنف ۱۰

Physics

فزیک صنف ۱۰

Coming soon

Chemistry

کیمیا صنف ۱۰

Coming soon

Biology

بیولوژی صنف ۱۰

Coming soon

English

انگلیسی صنف ۱۰

$Cover of the grade 11 Mathematics textbook$

Mathematics

ریاضی صنف ۱۱

Physics

فزیک صنف ۱۱

Coming soon

Chemistry

کیمیا صنف ۱۱

Coming soon

Biology

بیولوژی صنف ۱۱

$Cover of the grade 12 Mathematics textbook$

Mathematics

ریاضی صنف ۱۲

Coming soon

Physics

فزیک صنف ۱۲

Coming soon

Chemistry

کیمیا صنف ۱۲

Coming soon

Biology

بیولوژی صنف ۱۲

Coming soon

English

انگلیسی صنف ۱۲

$Cover of the grade 10 Mathematics textbook$

Mathematics

ریاضی صنف ۱۰

Physics

فزیک صنف ۱۰

Coming soon

Chemistry

کیمیا صنف ۱۰

Coming soon

Biology

بیولوژی صنف ۱۰

Coming soon

English

انگلیسی صنف ۱۰

$Cover of the grade 11 Mathematics textbook$

Mathematics

ریاضی صنف ۱۱

Physics

فزیک صنف ۱۱

Coming soon

Chemistry

کیمیا صنف ۱۱

Coming soon

Biology

بیولوژی صنف ۱۱

$Cover of the grade 12 Mathematics textbook$

Mathematics

ریاضی صنف ۱۲

Coming soon

Physics

فزیک صنف ۱۲

Coming soon

Chemistry

کیمیا صنف ۱۲

Coming soon

Biology

بیولوژی صنف ۱۲

Coming soon

English

انگلیسی صنف ۱۲

A teacher who is always there.

Chat, talk, practise and keep going, in Dari or English. Pashto is coming soon.

How do I add ⅓ and ¼?

Give them the same bottom: 4/12 + 3/12 = 7/12. Afarin for asking!

Chat with Ustad

Ask anything about your lesson. Ustad explains in simple words, gives an everyday example, and shows which lesson the answer came from.

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Hold the button and ask out loud. Ustad answers out loud too, as slowly as you like, with captions.

A5/12

7/12

C2/7

D1/7

Practice that feels like a game

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You

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Short lessons on your rights and your history. Write a letter to the world if you want to. Your name never leaves.

Learning verified

Grade 8
Mathematics

Proof no one can eraseComing soon

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Continue where you left off. Ustad is one tap away, by text or by voice.

grades, every subject

languages: Dari and English, Pashto coming soon

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The people behind Ustad.

Three people, one hackathon, a lot of tea.

I have a slide for that.

Kadir Yağız Çetin

Chief Executive Designer

Full-time glutton, part-time technologist and policy researcher.

It worked on my laptop.

Shahir Tahiri

Chief Technology Inventor

Invented Ustad. Still looking for his charger.

I taught Ustad to say Afarin.

Fahimah Haidary

Chief AI Prompter

Keeps the AI patient. Working on the rest of the team.

Get Ustad.
Free, everywhere.

One app for every screen. Your lessons move with you: start on a phone, continue on a computer.

Windows

Windows 10 and 11 · 64-bit · one file, 364 MB

Download for Windows

One file: open it and follow the steps. During setup it downloads the teacher (3–4.5 GB, the right size for your computer); after that Ustad works fully offline. If Windows says it protected your PC, choose “More info”, then “Run anyway”.

Setup .exe SHA-256 Files for a computer without internet

Android

Android 8 and newer

Coming soon

iPhone & iPad

iOS and iPadOS 15 and newer

Coming soon

Mac

Apple silicon and Intel · macOS 12+

Coming soon

No app store?

Get Ustad from a friend's phone, a memory card or a USB stick. It checks itself on install.

Version 1.1.0 · check the SHA-256 fingerprints

Questions

Is Ustad free?

Yes. Every book, every feature, and every new book as it arrives. No ads.

Do I need the internet?

Only to download. After that, lessons, search, practice and Ustad's answers all work offline. The app never connects to the internet.

Do I need an account?

No. There is nothing to sign up for: no name, no email, no phone number. Your progress stays on your device.

Which languages?

Dari and English, in the app and in the lessons. Pashto is coming soon, and more languages will follow.

Where do the lessons come from?

From the official school textbooks, rebuilt into short lessons and checked by teachers. Every lesson shows which textbook pages it covers.

The classroom can close. Learning doesn't have to.

The real textbooks. Page by page.

A teacher who is always there.

Start in three steps.

The people behind Ustad.

Get Ustad.Free, everywhere.

Questions

Get Ustad.
Free, everywhere.