size it up.

A little perspective

Trust your eye.

Five comparisons. Two objects each time. How close can you get?

  1. Compare

    The object on the left is your measuring stick. Keep resizing — the view automatically zooms out when you need more room. You can also zoom the canvas; both objects scale together without changing your estimate.

  2. Find the right size

    Drag the blue handle, scroll while hovering it, tap − / +, or use the arrow keys. Match the dimension in the question.

  3. Lock it in

    Reveal the real size and earn up to 100 points. Five rounds add up to a maximum of 500.

The first answer in each round counts. A new challenge arrives every day at 00:00 UTC. Object sizes use the specific examples shown in the answer.

Read the full rules and scoring guideLet’s play

Get in touch

Contact Size It Up

A question, a surprising comparison, or something that did not work as expected?

For help and feedback, email service@sizeitup.xyz.

Feedbackservice@sizeitup.xyz

Suggestions and bug reports

Have an idea for a new feature, a small improvement or a bug to report? Visit Feedback and sign in with Google or a verified email address to post. Other players can vote for or against suggestions, or select “Me too” if they’ve run into the same bug. Each account can have one unresolved suggestion or bug report at a time. Open your post to check its status and read the team’s replies. After each new response from the team, you can reply once while signed in to the account that created the post. Everyone can read the conversation.

Our Special Thanks page recognizes players whose suggestions we’ve accepted or whose reports have helped us fix a bug. It shows their current nickname, avatar, the flag for the country or region set in their profile (if available), and totals for accepted suggestions and resolved bugs. Posts also show your current nickname and avatar. For private help or questions about your data, email service@sizeitup.xyz. Please don’t post personal information.

Questions about the game

A little context makes a report easier to understand. Include the details that are relevant to your question:

Do not include passwords, sign-in codes, session cookies, or other sensitive information. If you attach a screenshot, remove personal details that are not needed to explain the issue.

  • The challenge date shown in the game, which uses UTC, and the objects being compared.
  • What you were trying to do, what you expected, and what happened instead.
  • Your device and browser, if you encountered a display or interaction problem.
  • A source link or a note about the measurement, if you think a dimension needs checking.

Questions or requests about your data

You can use the same email address for questions or requests about your profile, saved progress, or submitted scores. Describe your request and whether you played as a guest or signed in.

The Privacy page explains what the current game saves and the available controls, including the limits of signing out or clearing cookies.

How the game works

For the daily rules, dimension sources, and how illustrations are measured, read About Size It Up.