learnclash.com

LearnClash offers general knowledge plus hundreds of built-in topics, ranging from history to space, and you can create your own topic if the one you want is missing. Topics apply to both duels and the daily quiz, so the same subject matter carries across every mode. The one caveat: "hundreds of topics" and "dozens of topics" are the only counts the site gives — there's no published full list to browse before you sign up.

The two starting points

When you set up a round, you pick a topic first. LearnClash describes two entry levels:

• General knowledge — a mixed-topic default if you don't want to commit to a subject.
• Hundreds of topics — specific subjects, with history and space named as examples.

The site also refers to "trivia questions across dozens of topics," which suggests the browsable catalog you'll actually see may be narrower than the total number of topics available. Treat "hundreds" as the upper bound and "dozens" as the more conservative figure.

Creating a topic that doesn't exist

If you can't find your subject, LearnClash lets you create it. The site states this directly: "Can't find yours? Create it." That means the topic list isn't fixed — a niche subject (a specific exam syllabus, a local history, a fandom) can become a playable topic rather than a reason to leave.

The source doesn't specify how topic creation works — whether you supply your own questions, whether the AI tutor generates them, or whether a created topic is private or shared. If that distinction matters to you, it's worth testing before relying on it.

Where topics apply

Topics aren't limited to one mode:

Because missed questions come back on a schedule, your topic choice has a longer tail than a single round — a topic you pick today can keep resurfacing for months.

What a round actually looks like

Topic selection feeds into a fixed round structure, which is useful for judging whether a subject is deep enough to hold up:

• 18 questions across 6 rounds
• 45 seconds per question
• 6 questions in about 3 minutes per turn
• Turn-based, asynchronous, with a 72-hour window for your opponent to play their turn

So a single topic needs enough questions to fill 18 slots per duel, repeatedly, without obvious repeats — unless the repeats are the spaced-repetition ones the app intends.

Practical takeaways

• Start with general knowledge if you're unsure which subject you'd enjoy dueling on.
• Search for your specific topic before creating one — with hundreds available, the odds are decent it already exists.
• Create a topic when you want something the catalog doesn't cover; this is the documented escape hatch.
• Expect the daily quiz and duels to draw from the same topic pool, since the site describes topics as applying across both.

The site doesn't publish a topic directory, pricing for topic creation, or whether created topics are public. If you need to confirm a specific subject exists, the fastest check is to start a round and look at the topic picker.

LearnClash is a quiz game where you play a real opponent 1v1 instead of answering questions alone. You pick a topic, take turns answering six questions per round, and read an explanation after every answer. Questions you miss come back later through built-in spaced repetition. It's free on iOS, Android, and in your browser, with no ads even without Premium.

How a duel actually works

A full duel is 18 questions across 6 rounds, with 45 seconds per question. Play is asynchronous: you take your turn, then your opponent has 72 hours to take theirs. That means you don't need to be online at the same time as the person you're playing.

The setup has three steps:

1. Pick a topic — start with general knowledge or choose from hundreds of topics, from history to space. You can also create your own if you don't find one you want.
2. Choose your opponent — challenge a friend with a link (they can play the first round in their browser without installing anything), get matched with another player, or take on an AI rival.
3. Play your turn — answer 6 questions in about 3 minutes and read why each answer is right.

If you want to play immediately rather than wait on a human opponent, there are six AI rivals ready to go.

What makes it different from a typical quiz app

Most quiz apps stop at the score. LearnClash adds two mechanics that change what you get out of a round:

Every answer is explained. After each question you read why the answer is correct. If you're still curious, you can ask Clash, the built-in AI tutor, a follow-up question.

Missed questions come back. Spaced repetition is built in: a question you miss is due again after 7 days, and again after 90 days once you answer it correctly. The point is that a duel makes you care about the answer, and the review schedule helps you keep it.

Is it free, and where can you play it?

LearnClash is free to play on iOS, Android, and in the browser. The site states there are no ads, even without Premium, so an ad-free experience isn't gated behind a subscription. You can play today's quiz in your browser with no signup and no download, and you can play your first round before you even sign up.

A pricing page exists at learnclash.com/pricing, but the available site material doesn't list specific prices or plan details, so check that page directly if cost matters to your decision.

Who it's for

LearnClash fits you if:

• You want competition to make studying feel less like a chore — a live opponent gives you a reason to care about each answer.
• You can't commit to a fixed time slot. The 72-hour turn window and asynchronous format work around different schedules.
• You want to actually retain what you get wrong, not just see a final score.
• You'd rather not pay or sit through ads to try it.

It's a weaker fit if you want real-time, simultaneous play against strangers, or if you're looking for a structured course rather than question-and-answer rounds.

Getting started

The fastest path is the browser: open today's quiz, play a round without signing up, and see whether the explanation-after-every-answer format works for you. If it does, install the app on iOS or Android to keep your duels and review schedule in one place. To play against someone you know, send them a challenge link — they can finish the first round in their browser before deciding whether to install anything.

Yes. LearnClash is free to play on iOS, Android, and in your browser, and it stays ad-free even if you never pay for Premium. You can also start playing without signing up or downloading anything: the daily quiz runs in your browser, and you can play your first round before creating an account. A Premium option exists, but the site does not publish its price or what it includes, so treat "free" as covering the core duel experience rather than every possible feature.

What you get for free

Based on LearnClash's own description, the free tier covers the main loop of the app:

• 1v1 quiz duels against a friend, a matched player, or an AI rival
• Explanations after every answer, plus follow-up questions to the AI tutor ("Ask Clash")
• Spaced repetition: questions you miss come back after 7 days, and again after 90 days once you answer them correctly
• Hundreds of topics, from general knowledge to history and space, with the option to create your own
• No ads, whether or not you have Premium
• Daily quiz in the browser with no signup and no download

The site also notes the app was shortlisted for Best of Swiss Apps 2026 and nominated for Germany's TOMMI Games Award 2026 in the Education category — useful context if you're weighing whether the free product is polished enough to bother with.

Free vs. Premium: what's actually confirmed

The honest summary: the site confirms Premium exists and confirms the free tier has no ads, but it does not publish pricing or a feature comparison. If Premium matters to your decision, check the pricing page directly rather than assuming what it unlocks.

How to start playing for free

1. Pick a topic — general knowledge by default, or choose from the listed topics. You can create a topic if yours isn't there.
2. Choose an opponent — send a friend a link (they can play the first round in their browser), get matched with another player, or take on an AI rival if you want to play immediately.
3. Play your turn — answer 6 questions in about 3 minutes, reading the explanation after each one. Your opponent then has 72 hours to take their turn.

A full duel is 18 questions across 6 rounds, with 45 seconds per question, played asynchronously. That structure is what makes the "no signup" browser entry point practical: you can try a real round before committing to an account.

Common points of confusion

• "Free" doesn't mean "no Premium." The site explicitly frames no-ads as a free-tier property ("No ads, even without Premium"), which implies Premium is an optional upgrade, not a requirement for ad-free play.
• Browser play and app play are both free, but only the browser path is described as needing no signup or download. The iOS and Android apps are free to install.
• The 72-hour turn window is a feature, not a paywall. It's how asynchronous duels work, not a limit tied to payment.

If your only question is whether you can play LearnClash without paying or seeing ads, the answer is yes on both counts. If you want to know what Premium costs or adds, that information isn't in the site's public description — go to the pricing page for the current details.

LearnClash brings a question back 7 days after you miss it, and once you answer that question correctly, it returns again 90 days later. This applies to questions across your duels and topics, so the review queue follows what you personally got wrong rather than a fixed study plan. It is the mechanism behind the site's claim that "the questions you miss come back later" — the point is to make a missed answer cost you something once, then pay you back in retention.

The two intervals

The 7-day step is the correction pass. The 90-day step is the retention check: it only triggers once you have already gotten the question right, which is why the site describes the sequence as "a missed question is due again after 7 days, and after 90 days once you answer it correctly."

Why the intervals are ordered this way

A wrong answer tells you the fact is not yet stored, so a short gap is enough to test whether the explanation stuck. A correct answer tells you it is stored but still fragile, so the next check is pushed far enough out to be meaningful. If you miss it again at either checkpoint, you re-enter the 7-day cycle — the schedule is driven by your last result, not by a calendar.

This is the standard spacing logic: short intervals for material you are still getting wrong, long intervals for material you have demonstrated you know.

What this looks like in practice

Say you miss a question about the Treaty of Westphalia in a history duel. You read the explanation after the answer, and the question is scheduled to reappear 7 days later. When it does and you answer correctly, it drops out of the short cycle and is scheduled for 90 days out. If you miss it that second time, you are back on the 7-day track.

The same loop runs regardless of how the duel itself ended — the review queue is tied to the question, not to the match result.

Where the review actually happens

The site does not describe a separate "review mode" screen. The mechanism is described as part of normal play: duels are turn-based with a 72-hour window per turn, and a duel is 18 questions across 6 rounds with 45 seconds per question. So the returning questions surface inside the quiz flow you are already using, which is consistent with the pitch that you "get smarter with every duel" rather than by switching to a separate study tool.

Limits worth knowing before you rely on it

• The intervals are fixed, not adaptive. LearnClash states 7 and 90 days. It does not describe a ladder of intervals that lengthens with each success, so do not expect a full Anki-style schedule.
• Only missed questions are guaranteed to return. The 90-day return is described as applying "once you get them right" — i.e., to questions you previously missed. The site does not claim that every question you answer correctly on the first try is scheduled for later review.
• Retention depends on you showing up. Because duels are asynchronous with a 72-hour turn window, the review only reaches you when you are playing. If you stop playing, the schedule has nothing to deliver into.
• No stated cap on queue size. The site does not say how many due questions can accumulate or how they are prioritized against new questions in a duel.

Quick way to test it yourself

1. Play a duel and deliberately note one question you got wrong.
2. Read the explanation shown after the answer.
3. Keep playing over the next week and watch for that question to reappear around day 7.
4. Answer it correctly and note that it should not resurface until roughly the 90-day mark.

If the question comes back sooner than 7 days or not at all, that is your signal that the schedule is behaving differently from the description — worth checking against the current app version rather than assuming the published intervals.

You play a LearnClash duel by picking a topic, choosing an opponent, then answering 6 questions in about 3 minutes on your turn — reading the explanation after each answer. Your opponent has 72 hours to take their turn, so you don't need to be online at the same time. You can start free in your browser with no signup and no download, or install the app for iOS and Android.

Step 1: Pick a topic

Start with general knowledge or choose from hundreds of topics, from history to space. If your topic isn't listed, you can create it.

Step 2: Choose your opponent

Three options, depending on whether you want to play now or later:

There are six AI rivals ready when you want to play right away.

Step 3: Play your turn

Answer 6 questions in about 3 minutes. After every question, read why the answer is right — and if you're still curious, ask Clash, the AI tutor, a follow-up.

Your opponent then has 72 hours to play their turn. Duels are turn-based and asynchronous, so timing doesn't need to line up.

What happens after the duel

A full LearnClash duel is 18 questions across 6 rounds with 45 seconds per question. The learning doesn't stop at the last answer:

• Every answer is explained — you see the reasoning, not just the result.
• Missed questions come back — a missed question is due again after 7 days, and again after 90 days once you answer it correctly. This built-in spaced repetition is how you keep what you learn.

Cost and access

LearnClash is free to play, with no ads even without Premium. You can play today's quiz free in your browser with no signup and no download, or download the app for free on iOS and Android. A pricing page exists if you want to check Premium details.

Common snags

• Your opponent hasn't played yet. That's expected — they have 72 hours. You can't force their turn.
• You want to play immediately but have no opponent. Use an AI rival instead of waiting on a match.
• You missed a question and want to review it now. The explanation appears right after each answer; the spaced-repetition return comes later (7 days, then 90 days after you get it right).