Loopit vs Sekai vs Aippy vs Castle: which make-and-play app fits you

Loopit, Sekai and Aippy turn a typed idea into a playable post, and Castle has you build by hand. Here is how the four differ on what they make, cost and terms.

Quick answer

Loopit suits quick interactive memes and tactile toys, Sekai suits quizzes and mini games shared in group chats, and Aippy suits games plus small tools, with commercial use allowed. All three are free to download and rated 13+ on the US App Store. Roam is an iPhone app built around games your friends can be in.

Updated Nov 4, 2026. Roam is our app, and the Roam team wrote this comparison. Roam is free to download and play on iPhone, and making works without a subscription; optional Spark and Reality plans and credit packs add more creation. Android: pre-register on Google Play.

Side by side

Loopit, Sekai, Aippy, Castle and Roam (checked Nov 4, 2026)
	Loopit	Sekai	Aippy	Castle	Roam
Platforms	iPhone, Android	iPhone, Android, web (sekai.ai)	iPhone, Android	Make on iPhone, iPad or Android; published games play in a web browser (Castle FAQ)	iPhone and iPad (App Store); Android: pre-register on Google Play
US App Store rating	4.8 from 46,869 ratings	4.8 from 29,692 ratings	4.9 from 25,121 ratings	4.7 from 41,319 ratings	See the App Store
Google Play	5M+ installs, 4.8 stars	10M+ installs, 4.7 stars	1M+ installs, 4.5 stars	10M+ installs, 4.7 stars	Pre-registration only
What you make	Playables: interactive memes, tactile toys, playable art, mini puzzles	Quizzes, interactive memes, mini games	Games, simulators, small tools, interactive art	Games, animations and drawings, built in a hand editor with templates and remix	Games with a world, art, characters, sound and rules
Free to start	Free to download; coins and separate creation credits sold in the app	Free to download; free limits not published	Free plan: 4 messages a day, 20 a month; Crystals sold in the app	Free to create and share; Bricks and Dweller subscriptions sold in the app	Free to download and play; making works without a subscription. Optional Spark and Reality plans and credit packs add more creation
Play with friends	Share and remix; live multiplayer not published	Share a link in a group chat; friends play and compete	Share and remix; live multiplayer not published	Parties and multiplayer, per its update notes	Solo or with friends; friends can be in the game
Who owns your work	You keep your rights; Loopit gets a perpetual, sublicensable license	You keep your contributions; AI output not addressed	You keep ownership; Aippy gets a perpetual license on what you publish; commercial use allowed	Your materials stay yours; Castle gets a sublicensable license	You keep ownership. Roam gets a license to run, improve and showcase it; you can opt out of AI improvement
Age rating	13+ (App Store); terms require 13+	13+ (App Store)	13+ (App Store); under 18 needs guardian consent	13+ (App Store); terms set no fixed minimum	13+ (App Store)

Ratings and installs from the US App Store and US Google Play on Nov 4, 2026. Limits and ownership from each app's terms. Roam does not publish its free limits.

Which one to pick

Pick Loopit if

You want short, tactile things to make and share fast: a meme people can poke, a satisfying toy, a tiny puzzle. Its feed and Remix button are the heart of the app.

Pick Sekai if

Your friends live in a group chat. Sekai's quizzes and mini games are made to be dropped in as a link, and it also works on the web at sekai.ai.

Pick Aippy if

You want to build games and also small tools, like a generator or a planner, and you may use what you make commercially. Plan around the free limit of 4 messages a day.

Pick Castle if

You want to build a game by hand, with real tools for art, physics, logic and sound, and play live with friends. It is not prompt-first, so it takes longer, and you learn more.

Pick Roam if

You want a game with a world, characters and rules, and friends inside it. Describe it in a sentence, then change it by talking.

How Loopit, Sekai and Aippy differ

All three are described as AI makers with a community feed. What they are built for is not the same.

Loopit From Beijing SeedLeap Intelligent Technology, on the App Store since January 2026. It calls its creations playables: interactive memes, ASMR toys, playable art and mini puzzles, which you describe, edit or remix. Coins and creation credits are sold in the app.
Sekai From Versa AI, on the App Store since June 2024. It calls itself a social platform for interactive experiences: personality quizzes, memes and chaotic mini games, with an endless feed. Sharing is built around links in group chats.
Aippy From NADA AI, on the App Store since July 2025. You chat with AI to build games, simulators, tools and interactive art. Its free plan allows 4 messages a day and 20 a month. Its terms mention paid plans without prices, and the App Store sells Crystals.

How to make a game on Loopit, step by step

What their terms say about your work

All three let you keep ownership, but the licenses differ. Loopit's terms (updated Oct 31, 2026) say you keep the rights you hold, while Loopit gets a perpetual, worldwide, royalty-free, sublicensable license, and other users may remix what you publish.

Aippy's terms (updated June 16, 2026) claim no ownership and list commercial use of what you build as allowed. Anything you post publicly comes with a perpetual license for Aippy. Sekai's terms say it does not assert ownership and you keep full ownership of your contributions; they do not say who owns AI output.

Castle's terms (effective July 30, 2026) claim no rights over what you upload and say your materials remain yours, while Castle gets a worldwide, sublicensable license to use them in the service.

Roam's terms say: "You retain ownership of all content you create." Roam gets a worldwide, royalty-free license to run, improve and showcase it, and you can opt out of its AI improvement program in Settings.

Loopit vs Castle

People also compare Loopit with Castle. Castle, from Monterey's Coast, has been on the App Store since February 2021, and Google Play shows 10M+ installs. It is not prompt-first: you build in an editor with tools for art, physics, logic, music and sound, start from a template, or remix someone else's game.

Castle's update notes mention parties and multiplayer, so it is one of the few make-and-play apps where friends can play live. Loopit is faster for a quick idea: type it, get a playable meme back, post it to the feed.

Apps like Castle, compared

Safety and age, for parents

All three apps show a 13+ age rating on the US App Store and a Teen rating on Google Play. Loopit's terms say users must be at least 13. Aippy's terms ask anyone under 18 to get written consent from a legal guardian. Sekai's terms do not state a minimum age.

Each app has a public feed of user-made content and lets people remix what others post, so it is worth scrolling the feed yourself before saying yes.

Make a game your friends can be in

Roam is free to download on iPhone. Describe the game or start from a photo, then play it solo or with friends.

Try: "my friends are the zombies in our school cafeteria, I only have a mop, survive 3 minutes"

Questions people ask

Loopit vs Sekai: what is the difference?

Loopit focuses on playables like interactive memes, tactile toys and mini puzzles, on iPhone and Android. Sekai leans on quizzes, memes and mini games shared by link in group chats, and also runs on the web. Sekai has more Google Play installs (10M+ vs 5M+), while Loopit has more US App Store ratings.

Loopit vs Aippy: which is better?

Loopit is the better fit for quick, tactile playables and remixing. Aippy fits better if you also want tools and generators or plan to use your creation commercially, which its terms allow. Aippy's free plan is capped at 4 messages a day; Loopit sells coins and creation credits.

Loopit vs Castle: which is better?

Loopit is better for quick playables you make from a typed idea. Castle is better if you want to build a game by hand in an editor and play with friends in parties. Both are free to download on iPhone and Android and rated 13+ on the US App Store.

Sekai vs Aippy: which should I use?

Sekai suits social, shareable formats and has a web version. Aippy suits people who want to build more structured games or tools by chatting. Both say you keep ownership of what you make.

Which of these apps is free?

All four are free to download. Loopit sells coins and uses separate creation credits, Aippy's free plan allows 4 messages a day, Sekai lists no in-app purchases and shows ads, and Castle says creating and sharing never need a purchase.

What age are Loopit, Sekai and Aippy for?

All three show 13+ on the US App Store and Teen on Google Play. Loopit's terms set 13 as the minimum, Aippy asks anyone under 18 for a guardian's written consent, and Sekai's terms state no minimum age.

Sources, checked Nov 4, 2026

Product names belong to their owners. Roam is not affiliated with them. Facts change: check each product's own site before you choose.