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Websim alternative: how Modder compares for games

Quick toys and apps, or tested games: what each is best at.

By the Modder team

Updated · 3 min read · Tested

One option

Websim

What it makes
Games, apps, toys and web pages
Speed
Seconds for a first version
Price
Free to start; credits for premium models

Our side

Modder

What it makes
Games only
Speed
Five to twenty-five minutes for a first build
Price
Playing is free; making needs a plan or a one-off top-up
On this page
  1. Websim and Modder
  2. Where each one is better
  3. Who should pick which
  4. Using both
  5. Questions

Verdict

Websim is a free-to-start playground where you describe anything (a game, a toy, an app, a fake website) and see it in seconds, then post it to a busy feed where people like, comment and remix. Modder is narrower: it only makes games, takes minutes instead of seconds, and needs a plan or top-up to make anything, because its agent builds in a game engine and plays each game to fix it before handing it over. Pick Websim for fast, free experiments of any kind; pick Modder when you want a full game with physics, menus and saves that holds up when friends play it.

Websim and Modder side by side

Websim compared with Modder
WhatWebsimModder
What it makesGames, apps, toys and web pagesGames only
SpeedSeconds for a first versionFive to twenty-five minutes for a first build
PriceFree to start; credits for premium modelsPlaying is free; making needs a plan or a one-off top-up
How it's builtAI writes a web page's codeAn agent builds in a game engine (three.js, Rapier physics), then playtests and fixes
MultiplayerAny project can be made multiplayer, by their pagesInvite-link rooms up to 10 with bots; 2 to 4 on one keyboard
AI inside projectsProjects can call AI, free to runNo live AI inside games
CommunityLarge feed: likes, comments, remixes, tipsA game portal with categories and search; remixes of published games

Where each one is better

Websim is better at

  • Speed: a first version in seconds, so trying ten ideas takes minutes.
  • Free to start, with a big, lively community feed full of remixes.
  • Not just games: apps, tools and AI-powered projects that call a model while you use them.

Modder is better at

  • Games built in a real engine with physics, cameras, saving, sound and menus already there.
  • Every build is played and fixed by the agent before you see it.
  • Multiplayer chosen up front: rooms for friends with bots in empty seats, or one keyboard.
  • Games land in a curated portal next to hand-built Originals, with their own pages.

Who should pick which

Websim is at its best as a sketchbook. A weird idea at midnight, a joke for a group chat, a remix of something you saw on the feed: it's fast, free to start and social, and it doesn't care whether the thing is a game. Many Websim projects are small toys, and that's the point.

Modder is for when the idea is a game and you want it to hold up. Its builds take longer because most of the time goes into playing and fixing: does the car flip on the ramp, does the shop open, can you finish level three. If you've had a Websim game fall apart the second time you played it, that's the gap Modder is built for.

Using both

They work well together. Sketch the idea on Websim to see if it's funny or fun, then describe the version you liked to Modder to get it built as a full game you can share and play with friends.

Questions

Is Websim free?

Websim says you can make things for free; credits are used for premium AI models and some features. Check their site for current prices.

Is Modder free?

Playing every game is free with no account. Making and remixing games needs a plan or a one-off credit top-up.

Why does Modder take longer than Websim?

Modder's agent builds in a game engine and then plays the game in a browser, reads screenshots and errors, and fixes what it finds, often over several rounds.

Can I make apps on Modder, like on Websim?

No. Modder makes games only.

Try Modder's maker

Making games needs a plan or credits; playing every game is free.

Plans and credits

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