Learn as you test, grow as you go.

Expert-reviewed flashcards for SAP, Linux, Python and more — reinforced by repetition until you reach the level you’re aiming for.

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Expert-reviewed content

Every card is written and reviewed for accuracy — not crowd-sourced guesses. One question, one clear answer.

Spaced repetition

Cards come back right before you would forget them, so what you study actually sticks for the long term.

Learn your field

Many fields and topics, growing over time. Pick what you need and study a few cards a day.

The app

See it in action

Scenario-style questions that make you think — not trivia. Reveal the answer, rate yourself honestly, and KnowCard schedules the card to come back right before you’d forget it.

  • Short sessions — a few cards a day is enough
  • Every card traced to source material and official docs
  • Do-cards turn knowledge into step-by-step practice
KnowCard home screen showing cards due for review across topics
Your queue for today
A scenario-style SAP HANA question on a KnowCard flashcard
A question that makes you think
The revealed answer with commands and parameters highlighted
The answer, with the details that matter
AI explanation showing a real-world example with a code block
AI explanations on demand
A knowledge card linked to four Do-cards for the same topic
One card, four real procedures
A Do-card with prerequisites and numbered operational steps
Do-cards — step-by-step practice
From the library

A sample of cards

Roughly how much can plain, unmodified Python code speed up after just compiling it with Cython, and where does the *big* Cython speedup actually come from?
The SAP Readiness Check for SAP Cloud ALM result is split into three groupings. What does each one tell you?
Which Maintenance Planner step can you run before buying any S/4HANA license, and what SUM-critical artifact does full planning produce?
What can the Project API do, what are its scopes, and what is notably absent from its operations?
You need the text inside the first matching <key> child, not the element object. Which ElementTree search method skips the extra .text step?
In the Specify Transfer Settings step, what initial load mode is the default and which reading type does it apply to all tables?
Someone assigns a long end-user report to priority class A so it 'finishes faster.' Why is that the wrong choice, and what do A/B/C actually mean?
You want one shared file system for an SAP database's data, log, and control files and reach for Amazon EFS. Why is that contraindicated, and is there any SAP workload where EFS is actually OK?
Pricing

Simple plans

Free

$0
  • A free selection of fields & topics
  • Spaced-repetition review
  • Favorites & progress basics

Pro

$9.99/mo · $59.99/yr
  • Every field and topic — full library
  • All answers unlocked
  • Do-cards — step-by-step how-tos
  • Full progress analytics
  • New content as it’s added

7-day free trial on all paid plans. Prices in USD — billed in your local currency by the App Store or Google Play.

Start learning today

Free to start — download the app or use it in your browser.

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