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.

or browse the library on the web →

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

Browse topics

Study by topic

Advanced Accounting (Canada)

Consolidation After Acquisition: Acquisition Differential & Impairment

SAP AS ABAP Administration

System Monitoring & Troubleshooting

36 cards

SAP Fiori

Smart Business & KPI Modeling

Filesystems & Mounting

102 cards

From the library

A sample of cards

Security groups and NACLs filter per resource by IP and port, but you need to inspect every packet crossing the VPC boundary itself. Which control does that, and where does it attach?

When creating a manual test case, which fields are always mandatory, and what does that tell you about how a test case is anchored in SAP Cloud ALM?

When is SECONDDATE the better choice than TIMESTAMP for a date-time column?

What does this print? ``` print(0.1 + 0.2 == 0.3) ```

How is the shift from project-mode support to production support formalized in the deploy phase?

An analytical app's ABAP front-end (PFCG) roles are all assigned, but the tile still returns no data. What access layer is commonly forgotten?

You are looking for the instance running the enqueue service and an instance has no ENQ work processes — does that rule it out?

A simulation error clearly comes from an SAP application check, not from the tooling. What are your realistic ways to resolve it?

Pricing

Simple plans

Free

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

Pro+AI

$12.99/mo · $89.99/yr

Everything in Pro
AI explanations on every card — go deeper, see examples, learn why

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.