What is Estimania?

Estimania is a free daily estimation game. Every day you get five numerical trivia questions — from science, geography, history, and sport — and your job is to guess the answer as closely as possible. And then share your score to your friends, of course! A new puzzle drops at midnight UTC.

How it works

Read the question and enter your best numerical guess.
Your score (0–100 per question) depends on how close you are on a logarithmic scale — being off by 10× scores zero.
After five questions your total out of 500 is revealed, along with where you rank on the leaderboard.

Frequently asked questions

How can I change the language?

Depends on your browser. On mobile:
Chrome: Tap the three dots (⋮) in the top-right corner → “Translate”.
Safari: Tap “AA” or the page icon in the address bar → “Translate”.

What kinds of questions are asked?

No topic is excluded! Questions span science, geography, history, sport, and more — always with a numerical answer. Some are deliberately Fermi questions: named after physicist Enrico Fermi, these are back-of-the-envelope estimation challenges where the exact answer is hard to know but a reasonable ballpark can be reached through logical reasoning (e.g. "How many piano tuners are in Chicago?"). You are not expected to know the answer — you are expected to think it through. You can also submit a question suggestion here.

How is the score calculated?

Each answer is scored on a log scale: a perfect guess scores 100, and being off by a factor of 10 scores 0. This means guessing 50 when the answer is 100 costs you the same as guessing 200 — proportional errors are treated symmetrically.

There are questions where there is no precise answer — isn't that a problem?

Not at all. Many questions — like "How many dogs exist worldwide?" — don't have a single exact answer. The point of the game is to develop a reasonable sense of scale, not to recall a precise figure. The reference answer is sourced from a credible estimate, and the log-scale scoring means you're rewarded generously for being in the right ballpark. Getting the order of magnitude right is the goal.

How often does a new puzzle come out?

A new puzzle is released every day at midnight UTC. Once you complete a puzzle, it locks — each puzzle can only be played once.

Can I play on multiple devices?

Yes. After completing your first puzzle you can generate a recovery code to link a second device, so your scores and leaderboard rank stay in sync.

Can I change my nickname?

Yes. — it will update on the leaderboard immediately.

Can my friends see what I guessed?

Only if you both want that. In a friend group, tapping a name on the day's leaderboard shows their score per question. The actual guesses stay hidden unless both of you have turned on “Share my guesses” on your settings page. Nobody outside your groups can ever see them.

I can't find my recovery code, what do I do?

If you still have the device you first played on, you can look it up again — it's under Recovery code on your settings page, or right here: .

Lost that device too? Then start fresh: delete the browser data for this site and when you play next time, you can enter a new nickname. If you're on the App:
Android: Settings → Apps → Estimania → Storage → Clear Data (resets everything)
iOS: Deleting and reinstalling the PWA is the only option

Is there an app?

Yes — Estimania is a Progressive Web App (PWA). On Android you can install it from Chrome; on iOS, use “Add to Home Screen” in Safari.

Who is behind Estimania?

Estimania is developed by me, Valentin. I am a 27 year old solo developer and trivia geek based in Graz, Austria. If you want to reach out, you can via Instagram or this form.

How does Estimania make money?

Currently, it doesn't - it's a pure passion project. If you want to help with the associated costs, you can support the project on Ko-fi.