lvlUpSysDesign
System design mocks, graded
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
lvlUp gives you a timed system design interview on paper and grades the
pages you draw.
It hands you one real system design question, starts a 35 minute clock, and
walks you through the four steps of the ritual. You work it out with a pen,
photograph your pages, and send them in. A minute later you have a debrief: a
score out of 100 across six dimensions, the evidence behind each one read off
your own page, what worked, the gaps, and one drill to run next.
THE RITUAL
Four steps, one clock, no restarts.
Framing, 5 minutes. Restate the problem. Agree on scope, users and success in
one sentence.
Estimates, 10 minutes. The five slots: volume, requests per second with a peak
multiplier, payload and egress, concurrency, and the judgment line.
Design, 15 minutes. Boxes and arrows, only after the numbers exist.
Parking lot, 5 minutes. Every open question lands here, and then you close them
out.
The clock shows the time left in the current step and the time left overall. In
the last minute of a step the digits turn warm. That is the only thing on the
screen that moves.
WHY PAPER
A real interview is a pen, a page and a clock. There is no editor, no
autocomplete and no undo, so practising in one teaches you reflexes that will
not be there on the day. lvlUp keeps the medium and takes the marking off your
hands: draw it, photograph it, send it.
THE DEBRIEF
It opens with the single biggest gap, because that is the one thing worth
fixing on the next attempt. Under it sits the DESIGN axis and its six rows:
requirements and constraints, high level architecture, data model and APIs,
scaling and bottlenecks, reliability and tradeoffs, and clarity of the drawing.
Each row carries its score and the line from your page that earned it. Then
what worked, then the drill.
PROGRESS
Every attempt is kept in order with its score, so the change is something you
can read rather than something you have to take on trust.
WHO IT IS FOR
Engineers preparing for a system design round, and anyone who has read the
theory and still goes blank in front of a blank page.
SUBSCRIPTION
lvlUp Pro is an auto-renewable subscription, $14.99 per month or $99.99 per year, billed to your Apple ID. It renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel it in your App Store account settings.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://lvlupinterview.com/privacy
Ratings & Reviews
Corrected app icon and small fixes.
The developer, Affirmi Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- User Content
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Affirmi Inc
- Size
- 22.3 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Affirmi Inc