Plans
Buy the course. Keep the course.
Free articles stay free forever. Courses are bought one at a time, once — and the parts added to them later come with it.
- Free stays free
- The open articles and the newsletter never need a card.
- Nothing renews
- One payment per course. There is no subscription to cancel.
- Payments by Razorpay
- Card details go to the gateway, never to us.
Free reading
No card needed
The open archive, the newsletter, and the opening part of every course.
- Every free article, in full
- The weekly newsletter
- The first part of every course
- Guidebook announcements
- Most people start here
A course
One payment
Buy the course you want. It stays yours — there is nothing to renew.
- Every part of that course
- Parts added to it later, at no extra cost
- Its guidebooks and downloads
- Progress, bookmarks and completion
What changes when you buy a course
Everything a free reader has today stays exactly as it is. Each course is bought on its own.
| Capability | Free reader | A course you own |
|---|---|---|
| Free articles | Included | Included |
| The weekly newsletter | Included | Included |
| Parts of that course | The first one | Every part |
| Parts added to it later | Not included | Included, no extra payment |
| Its guidebooks and downloads | Not included | Yours to keep |
| Progress, bookmarks and completion | Not included | Included |
| How long you keep it | Free articles stay open | No expiry, nothing renews |
| Other courses | First part of each | Bought separately |
Questions
How often does something new arrive?
A new deep dive every weekday, and a crash course finishes every few weeks. Nothing goes out that has not been read end to end by someone who works in the field.
Do I need a maths background?
Comfort with linear algebra and Python helps. Where a derivation matters we show it in full rather than pointing at a paper and moving on.
Can I read on my phone?
Yes. The reader is built for long reading on a small screen, and the newsletter carries the full article for members.
Do I keep a course after I have bought it?
Yes. There is no subscription and nothing renews — a course you have bought stays readable, and the parts added to it later come with it at no extra cost.
Does buying one course open the others?
No. Each course is bought on its own. The free articles, the newsletter and the opening part of every course stay open to everyone either way.