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When comparing Red/System vs ATS, the Slant community recommends Red/System for most people. In the question“What are the best systems programming languages?” Red/System is ranked 15th while ATS is ranked 16th. The most important reason people chose Red/System is:
Red has built-in support for concurrency and multi-core CPUs.
Question Ranking
Pros
Pro Built-in support for concurrency
Red has built-in support for concurrency and multi-core CPUs.
Pro Built-in formal specification
ATS has a theorem-proving type system powerful enough to prove that its functions meet their specifications. This happens at compile time with no performance impact at runtime. This can be used to prove that an ATS program doesn't have bugs commonly found in C++ programs, like "this function never leaks memory" or "this program never attempts to divide by zero" or "this buffer never overflows" or to verify pointer arithmetic, etc.
Pro Free and open-source compiler
The compiler (ATS/Postiats) is GPLv3.
Pro Functional programming
The syntax is ML-like with the usual functional language features like pattern matching and tail-call optimization.
Pro High-performance systems language
ATS works as a low-level systems language. ATS programs have performance and footprint comparable to programs written in C/C++.
Pro Good module system
Similar to Modula-3. This makes ATS a viable choice even for large-scale projects.
Pro Safe concurrency
ATS can prove its concurrent programs have no deadlocks or race conditions.
Cons
Con Doesn't work on 64-bit OSes
Still hasn't upgraded to be 64-bit OS compatible.
Con Not ready for production
Red is still on version 0.6.0. Which means that it still has some way to go before being used in production and in large projects.
Con No Windows version
But it does run on Cygwin.
