Why we can't put 'Rubik's' in a cube app's name

'Rubik's Cube' is a registered trademark, so anyone who does not own it cannot use it in an app's name or description without permission. The store rules and the trademark owner both say so plainly. That is why odd duck's cube app is 한눈 큐브, Cube at a Glance.

When you build a cube app, that word is the first thing you want in the name. It is what people call the thing, and what they search for. We left it out. There are two layers of reasons we cannot use it, and once it was out we found one thing we liked about that.

A name built to be a mark

fact The puzzle was originally called the Magic Cube. In 1980 the toy company Ideal renamed it Rubik's Cube after its inventor, because they wanted a distinctive name that could be registered as a trademark (Wikipedia, checked 11 September 2026). So the word was made to be a mark before it was the name of an object.

fact In the US Patent and Trademark Office records, 'RUBIK'S CUBE' is a word mark registered on 21 June 1983 and still live. Registration No. 1242974, class 28 (puzzles), renewed a third time on 13 January 2023. The owner is listed as the UK company Spin Master Toys UK Limited (TSDR checked 11 September 2026).

fact The trademark owner is the toy company Spin Master. It announced the purchase of the Rubik's brand on 27 October 2020 and announced that the acquisition had closed on 5 January 2021. In its brand use guide Spin Master says it holds more than 400 related trademarks worldwide, and writes that anyone referring to a cube that is not its product should not use RUBIK'S — including misspelled variants — and should use a generic term such as 'puzzle cube' instead (checked 11 September 2026).

We have not checked what form the mark is registered in at the Korean Intellectual Property Office. The conclusion is the same either way. An app goes out to the whole world from one store, and the store rules below do not care which country you are in.

The shape it lost, the name it keeps

The funny part is that the shape of the cube could not be kept as a trademark. In the European Union, at least.

fact On 10 November 2016, in Simba Toys v EUIPO (C-30/15 P), the Court of Justice of the European Union set aside the decision that had upheld the EU three-dimensional trade mark for the shape of the Rubik's Cube. The reason: in examining the essential characteristics — the cube and the grid — the invisible rotating function should have been taken into account as well (press release 122/16). On 24 October 2019 the EU General Court again confirmed the mark invalid, finding those characteristics necessary to obtain a technical result (T-601/17, press release 131/19), and on 9 July 2025 other cube-shape marks registered between 2008 and 2012 were invalidated for the same reason (Reuters report, checked 11 September 2026).

The shape is a function, and a function is not a trademark: that was the European courts' reading. A name is different. A name has no function. So it cannot be struck down for being functional the way the shape was, and as long as it is renewed it stays a mark.

The stores stop you before any court does

It never gets as far as a court. An app is caught in store review first.

fact Google Play's intellectual property policy says not to use someone else's trademark, such as their logo or brand name, without permission, and that an app that breaks the rule can be suspended. The impersonation policy forbids a title that suggests an official relationship where none exists, and gives 'Justin Bieber Official' as an example. A title is limited to 30 characters by the metadata policy (English pages, 11 September 2026).

fact App Store Review Guidelines 5.2.1 says not to use protected material such as someone else's trademark in an app without permission, 4.1(c) says another developer's brand or product name cannot go in an app name or icon without approval, and 2.3.7 says not to stuff metadata with trademarked terms and puts the app name limit at 30 characters (8 June 2026 edition, checked 11 September 2026).

Where those rules overlap is exactly 'Rubik's in an app title'. With permission it would be a different story, but even then Google asks you to have written proof and to get in touch before you submit for review. That is not a road an indie developer takes.

How it got its name

Take out the word you cannot use and what is left is what the app actually does. It scans, and it solves. That is how the subtitle became 'Scan & Solve'. This was the thing we liked about leaving the word out. Instead of borrowing someone else's name, what the app does became the name.

The 한눈 in front is the common first half of our app names. 한눈성경 (Bible at a Glance) came first and the cube followed. fact We first wrote it out by sound as 'HanNun' and then changed it to 'at a Glance'. Bible at a Glance was HanNun Bible when it first went up on this site on 5 July 2026, and ten days later, on 15 July, it became Bible at a Glance. Cube at a Glance went from HanNun Cube to Cube at a Glance within one day, 18 July. The only explanation left in the record is a one-line gloss: 한눈 = at a Glance. The name that carried the sound, only we could read. The name that carries the meaning, anyone can.

fact The result is these store titles (Google Play and App Store, checked 11 September 2026).

Only the Korean listing writes 한눈큐브 as one word. The English title is 30 characters. It uses every character the two stores allow, down to the last one, and Rubik's is not among them. In the long description we call the object a 'twisty puzzle'. The World Cube Association (WCA) regulations do the same thing: they call the event '3x3x3 Cube' and never use the word Rubik once (checked 11 September 2026).

fact And yet the word that appears nowhere in the store copy we wrote is there in the reviews. As of 11 September 2026, one review on the English Google Play page and one on the US App Store page each call it a 'Rubik's Cube'. The word we cannot use, a user can. The name is ours, and that word is theirs.

If you are making a cube app

• Do not put Rubik's in the title, subtitle, description, keywords, icon or screenshots. Changing the spelling does not help.
• Call the object a cube, a 3×3, a twisty puzzle. Cubers already call it that.
• Find the name in what the app does. For us 'scan and solve' was what was left, and it became Scan & Solve.
• If you have permission, keep the written proof. Google Play asks you to tell them before you submit for review.

This is not legal advice. It is only what we checked while naming our app.