When comparing Red vs Upload, the Slant community recommends Red for most people. In the question“What are the best cloud-based image processing services?” Red is ranked 8th while Upload is ranked 9th. The most important reason people chose Red is:
Other languages have complex, multi-step setups that beginners often get stuck on. Red has no installer, no setup, no dependencies*, just a single small (~1MB) command-line executable with both the compiler and repl. On Windows, you don't even have to launch executable from the command line--it has a GUI-console.
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Pros
Pro Simple toolchain
Other languages have complex, multi-step setups that beginners often get stuck on. Red has no installer, no setup, no dependencies*, just a single small (~1MB) command-line executable with both the compiler and repl. On Windows, you don't even have to launch executable from the command line--it has a GUI-console.
Pro Very simple syntax
Red syntax is a lot like Rebol. It's easier than most languages for beginners to pick up.
Pro Both low and high-level
Red has low enough access to do systems programming, but it's expressive enough for high-level scripting.
Pro Low cognitive load
Red has very simple syntax that's easy to learn. It gets out of your way and lets you think about the problem instead, enhancing productivity.
Pro Took a few seconds to setup
Upload.js installed into our web app in a few seconds. It's a lightweight library, so there's no UI elements. A "file input element" was already present on our page, and with Upload.js you set their helper method as the "onchange" attribute, and they take care of everything else from there.
Pro Image resizing & cropping
Used their AI image cropping for some projects (you don't define crop geometry yourself -- they detect which part to crop for you), and manual cropping for others (where the user wanted to set which part of the image to crop in the UI). We're currently saving all our images out to webp.
Pro Very cost-effective
Time savings aside, it's very cost-effective. Entry tier for like $7pm worked well for several client projects. Only upgraded to the $35pm tier because a client wanted password-protected files -- other than that, the quotas / limits are very generous.
Cons
Con Not production ready
Red is still under development and not considered stable.
Con Still in beta
It mostly works. It's good enough for building usable applications, but some planned features are missing.