When comparing Monkey X vs Modd.io, the Slant community recommends Monkey X for most people. In the question“What are the best 2D game engines?” Monkey X is ranked 27th while Modd.io is ranked 94th. The most important reason people chose Monkey X is:
Developers can make native calls directly from Monkey code. This allows access to any native functionality and platform-specific features.
Specs
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Pros

Pro Native code support
Developers can make native calls directly from Monkey code. This allows access to any native functionality and platform-specific features.
Pro Native module support
You are not restricted only to the modules you get from the official release. You can build your own stuff. Even build your own "app" module. It feels limitless. In comparison with other cross platform solutions, you actually get the translated source code and you can play with it if you want.
Pro Built-in modules for quickly building games
Monkey X has a selection of great built-in modules.
- Graphics
- Audio
- Input
- Data and Filesystems
- Networking
- Math
- Text and Strings
- Collections
- Online Services
Pro You can create custom targets
The language gives you the possibility to build your own targets. You are not limited to the targets officially supported.
Pro Low cost license fee
All target platforms for a fair one off license fee.
Pro Easy to learn
With it's Object orientation and clean syntax its a brilliant language to learn if you have never done any programming before and yet still has all the power it needs to make full games and apps.
Pro Uses a great, easy to learn language
Monkey X uses a custom programming language (called Monkey) for all its scripting needs. Monkey is rather easy to learn, it's object-oriented which will help most programmers with understanding it. It's also statically typed and uses a garbage collector, helping to avoid manual memory management.
Pro Partly open-source
The entirety of the base-language itself is open source. Commercial modules such as Mojo for non-free platforms cost a one-time fee. Though Mojo is not free for all targets, the targets for these platforms are, meaning it is possible to implement other frameworks for these targets.
The Desktop (GLFW and C++ based) and HTML5 implementations of Mojo are currently free and open source.
The language's development is completely public, and is managed via GitHub.
Pro Free HTML5 and Desktop (GLFW) target platform
The free version of Monkey X lets you compile to HTML5 or Desktop (GLFW). Other platforms such as iOS, Android (and OUYA), XNA, Flash and Windows 8 (Phone) require the paid version of Monkey X Pro.
Pro Cross-platform
Monkey X is a cross-platform game engine. It allows developers to run the same code on multiple platforms, including iOS, Android, Windows Mobile, Flash, Windows, Mac OS and Linux.
The development environment supports Windows, OS X, and Linux.

Pro Not running in its own VM
Unlike other multi-platform engines (Unity3D, Corona, etc), Monkey-X games do not run explicitly in their own virtual machines. Your code is translated into the native languages of each target platform, and then compiled as a native executable. However, just as native games, on platforms such as Android (Currently), and HTML5, games will be ran through the targeted platform's usual VM(s). That being said, you won't be dealing with a proprietary virtual machine, so you won't experience any real overhead when compared to a native game.

Pro Made by the Mark Sibly Factor
The Mark Sibly Factor denotes that a programming language will be easy to learn, fun to learn and allow any age group ( within Cognitive Reason ) to program games and great games. The Mark Sibly Factor denotes also that the games programming language you purchase will be backed by decades of compiler programming experience, game making tool programming and finally a Game Programming Language that kicks Ass.
Pro Free for commercial releases
With the free version of Monkey you are still able to create commercial HTML5 and Desktop games.

Pro Many community modules available
The community has created essential modules:
- Spine for animations
- Box2D and Chipmunk for physics
- Game frameworks such as Ignition, fantomEngine, and Flixel
- Diddy for lots of extra functionality
- FontMachine for custom bitmap fonts
- MiniB3D for 3D gaming
- And several others...

Pro Drawing Commands
Drawing commands are easier to read and edit than is manipulating scene graphs. You can immediately see in your code what's going to be drawn and in what order. Transformations are a no-brainer too.
Pro Lots of great examples
Monkey X includes over 50 examples ranging from complete sample games to demos of single features.
Pro Object oriented programming
MonkeyX is an object-oriented dialect of BASIC that's easy, clean and powerful.
Pro Its Fun, its easy to script
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Pro Runs well on low-end devices
The game client doesn't use much CPU nor bandwidth.
Pro Free
By far, this engine is completely free to use.
Pro No installation required - super easy to get started
Modd.io runs in browser, it provides IDE, map editor, and asset manager all in one platform, so you don't need to download or setup anything.
Pro Easy to use free Asset Library
You can easily change your game assets (images, sound, etc) with a single click using modd.io Asset Library
Pro Has multiplayer support baked in
This engine supports up to 64 concurrent players, and hosts servers for you as well
Pro Perfect for Impatient game developers
It literally takes 5 minutes from signup to publishing my game
Pro Easy to use
Modd.io is designed for new/intermediate developers who wants to get into game development. You should be comfortable using the engine after spending about 15 minutes in watching tutorial videos
Cons

Con You'll have to learn a new programming language
Even though Monkey is rather easy to learn and borrows a lot of concepts from more popular languages, having to learn a new language develop games is a lot of friction for people that already know how to program in other languages..

Con The documentation is not very thorough
The documentation contains a reasonably detailed language overview, and a somewhat-generated list of the included modules, classes, and methods. Module descriptions are rather lax, but usually present. Method descriptions tend to be short, and a majority of them contain no usage snippets; most parameters have very minimal descriptions. And there are no community collaboration features to help improve it, besides GitHub.
Con The included IDE is poor
Although better IDE'S are availabe for a price, the default one is bare bones and lacks functionality
Con No real asset store
Untangling how to keep assets in the ".data" requires attention and a filenaming convention.
Con limited OS export targets with free version
Free version only targets Desktop (macOS, Windows, Linux) and HTML5, not mobile.
Con The engine is evolving in a bad way
Over the last updates, many useful features have been removed, making it harder to create more complex games.
Con Not very secure
Modd.io comes with its own security issues. Many of them have been used to destroy eachother's games, which completely busts your progress on your game unless you have backed it up by exporting it's JSON.
Con Not Possible for stuff
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Con Annoying asset size limit
Each asset is limited to 800kb (except for audio being 3mb) which is okay for simple assets but unacceptable for creating spritesheets for animations or tilesheets for the map.
Con Very flat map
No matter how well game maps are made, all of them look just not beautiful.
Con No/limited camera manipulation
You cannot create a shake effect which is also urgently needed in complex game creation.
Con Certain variable datatypes are urgently needed but do not exist.
Such datatypes as arrays composed of numbers, strings, etc are needed to create complex games but just do not exist in this game engine.
Con Joke-y community
Most of the staff team in the community are constantly behaving like jokers. It just always feels like 80% of the staff team is not the right pick for such a community.
Con The homepage is not good
The homepage allows players to join your game, but the way it works is just not good. The "unpopular 0 player" games get less exposure than the popular games. The tier system also puts a star on your game card which also lures players to your game making them think this game has a special event or something, giving a disadvantage to the less popular games which are still so called "Tier 1".
Con Not very powerful
This engine is ready to use right away, but already starts dropping framerate at over 1000 units which are not very active.
Con Tier-based servers with certain lockdowns
Modd.io "tiers" all the games you create. The very basic tier, commonly called "Tier 1" is very limited and removes motivation to develop a game.
Con You'll have to learn a new programming language
This engine has it's own IDE with a drag and drop style programming language. It does take a good 2 hours to get familiar with the API..
Con No lower level API access
You cannot access lower-level APIs through this engine, such as the renderer.
Con No single player support
All games in modd.io must support multi-player game mode.
Con Limited customizability
Modd.io is designed to be good at making "specific" kind of multiplayer games. Its strength unleashes if you don't care too much about the specifics in UI. For example, if you wanted to make a casual death match game, it is extremely easy to make it using modd.io. However, if you want to create a puzzle game with a unique UI, it becomes very time consuming.
Con No 3D support
This engine is limited to 2D only.
