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Last updated: Nov 2026

Guide

Preview, buy and read Primers

A Primer is a short, visual guide to one topic: the story, the math and the code, on a few hand-drawn pages. You read it online, page by page, in the Primer viewer.

Readable now: TriFleetRCA: Research Project Overview (8 pages, 2 free, ₹749); GPU & CUDA: Kernel Fusion (9 pages, 2 free, ₹749). 24 more are listed as Coming soon.

Steps

  1. Browse the catalogue

    Open Primers. Filter by category with the chips at the top. Each card shows the price, the number of pages and the level. Primers you can read today say Read online; the rest say Coming soon.

  2. Read the free preview

    Click Preview 2 pages free on a readable Primer. Anyone, signed in or not, can read the first pages (the viewer says how many: "Preview: the first 2 pages are free"). After that the viewer shows Preview ends, how many pages are left and the one-time price. The locked pages are only sent to an account that can read them.

  3. Get full access

    Every page unlocks when you're signed in with an account that has any of:

    • Free early access, on accounts that turned it on before paid plans launched (closed now).
    • A paid plan (Scholar or Professional) that is active.
    • That Primer bought, a one-time purchase.

    The viewer then shows All N pages unlocked, and on Primers the button reads Read now.

  4. Buy a Primer

    1. Click Get this Primer on its card or in the viewer. This opens checkout for that Primer.
    2. Pay the exact amount shown by UPI, then tap I've paid (adding the 12-digit transaction ID is optional and speeds up checking). Follow Pay with UPI.
    3. Once we confirm the payment, the Primer is yours: every page unlocks and checkout shows Already yours if you open it again.

    Primers marked Coming soon can't be bought until they're published; their checkout says so.

  5. Read it again later

    Your Primers are listed under Your primers in your workspace, marked Yours when every page is unlocked. Ones you've opened also appear under Continue where you left off. To keep a copy, click Download PDF on the Primer page or in Your primers; the PDF is only served to accounts that own the Primer or have full access. Buying a Primer gives you a personal right to read it for your own learning; please don't copy or share it (Terms).

Troubleshooting

You seeWhyFix
Pages after the preview stay as grey placeholdersYou're signed out, or your account has no early access, plan or purchase for this Primer.Log in; then buy the Primer or choose a plan on Pricing.
"This page is part of a paid Primer."A locked page image was opened directly without access.Read it in the viewer at /primers/<name>/ while signed in.
Paid, but the pages are still lockedThe payment is still being confirmed.Check its status under Payments in your workspace (statuses).
Checkout says "Coming soon"That Primer isn't published yet.Pick a Primer marked Read online.
Checkout says "Already yours"This account already owns it.Click Open it. Paid twice? See Refunds.