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Quadrantcode
Practice that compounds

Make every coding session count.

Quadrantcode connects solving, reflection, mistakes, and revision—so you improve from how you practice, not only from how many problems you finish.

Start practicingSee the practice loop

Passwordless access · Private by default · Built for deliberate practice

The Quadrantcode dashboard: current streak, solves this week and in total, average session time, a year of activity, and the topics worth attention next.
The real dashboard, signed in as a demo account — the numbers are example data.

One connected loop

Progress becomes clearer when the context stays connected.

  1. 01

    See the whole attempt

    Track active solving time, pauses, and the exact places where momentum breaks.

  2. 02

    Learn from friction

    Reflect while the context is fresh and turn recurring mistakes into visible patterns.

  3. 03

    Return at the right time

    Build a focused revision queue from what your own practice is telling you.

The real app

What you see once you have practised a little.

Screenshots of the running app, signed in as a demo account. Every number in them is example data, not anybody's real practice.

  • The Revision page listing four problems due, each with the reasons it ranks where it does and Got it, Struggled and Lost it buttons.
    A revision queue with its reasonsWhat is due today, hardest first — and every item says why it is there.Demo account · example data
  • The Mistakes page grouping recurring mistakes by topic, such as off by one in binary search, with counts and dates.
    Mistakes that repeat, groupedBuilt from your own reflections and the stuck points you confirmed.Demo account · example data
  • The Analytics page showing streak, solves this week, average session time, topics worth attention and minutes per solve.
    Where your time goesStreaks, time per solve, and the topics worth attention next, with the reasons.Demo account · example data

Questions

Where do the problems come from?
A problem from another platform links out to the site that hosts it; Quadrantcode never copies its text. What Quadrantcode records is how you solved it — time, stuck points, reflections and revision.
Who can see my practice?
Only you. A public profile is off until you turn it on, shows only the sections you choose, and never includes your code, notes, mistakes or reflections.
Can I delete my history?
Yes. Settings has a control that deletes your solve history, and you can stop code snapshots being captured at all.
Is there a paid plan?
No. There is nothing to buy today.
Are the company tags real interview questions?
No. Company names describe a style of practice. Quadrantcode is independent and does not present any problem as an official or previously asked question.

Built for deliberate practice

Stop collecting solved problems. Start building reusable skill.

Keep the evidence from each attempt, spot the patterns across sessions, and give your next study block a clear starting point.

Open your workspace