OptPrep 1.0.1

A polish release. Open it at coflazo.github.io/optprep, or run npx optprep (Node 20 or newer). Your saved progress carries over.

What changed

• An exam result reads like a graded sheet: each row marked, the net score printed in the corner box.
• Lesson checks lead with the question, keep Check and Hint on one row, and list what they use as a footnote.
• Exponents print as superscripts in questions, options and solutions, and counts agree: "exactly 1 head", "1 tail then a head".
• Plot labels stay inside the frame and no longer overlap.
• Quieter frames: answer fields use a pale print of the form ink, corners are 6px, and the sidebar stripe is gone.
• Text and number inputs now have a 3:1 border against the page.

Also new

• DESIGN.md documents the design system.
• The README shows the app in light, dark and on a phone.

OptPrep is a personal project shared for free. It is not affiliated with, endorsed by or connected to Optiver. MIT license.

OptPrep 1.0.0

Free practice for the Optiver online assessment. Open it at coflazo.github.io/optprep, or run it yourself with npx optprep (Node 20 or newer).

What you get

• Every task on its real clock: 80-in-8, Beat the Odds, NumberLogic, Likelihood List, Intervals, Orderbooks and nine Zap-N games, with exam replicas matched to the battery you sit.
• A lesson for every question type, in short steps with a question after each one.
• A worked solution for every answer: the question restated, a picture, the steps, the shortcut you can use inside the time limit, and a sanity check.
• A roadmap for each task with five levels per skill, a daily goal, and a list of the patterns that keep costing you points.
• A market-making round for the interviews that come after the online assessment.
• It runs offline and installs as an app on desktop and phone. Your progress stays on your device; sync to a private gist in your own GitHub account is optional.

How it was checked

• 3,094 library questions re-solved by an independent C++ and Python pipeline: 0 failures. 607 Zap-N game instances re-solved: 0 mismatches.
• 738 JavaScript, 19 Python and 34 C++ tests pass on Linux, macOS and Windows.
• Lighthouse on the live site: 99 performance, 100 accessibility, 100 best practices, 100 SEO.

Good to know

• Optiver publishes no pass marks. The Ready mark means your recent exam replicas met OptPrep's own bar, which sits above what candidates report.
• If your online assessment looked different, open a format report and the next release will match it.

The video below is the same tour with sound.

OptPrep is a personal project shared for free. It is not affiliated with, endorsed by or connected to Optiver. MIT license.