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Hylo Alternatives
Similar projects and alternatives to hylo
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Kargo
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carbon-lang
Carbon Language's main repository: documents, design, implementation, and related tools. (NOTE: Carbon Language is experimental; see README)
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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SaaSHub
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NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better hylo alternative or higher similarity.
hylo discussion
hylo reviews and mentions
Posts with mentions or reviews of hylo.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2025-07-24.
- There is no memory safety without thread safety
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Ask HN: Memory-Safe Low Level Languages
See https://wiki.alopex.li/SurveyOfSystemLanguages2024
and the related discussion https://lobste.rs/s/c3dbkh
Serious total MSLs that have a defined memory model to allow "low level" operations seem to be scarce if not any. Hence I do not think there is any single one that comes between C/Zig and Rust.
I would have said https://www.hylo-lang.org/ but, personal opinion, the syntax also seems like there is too much going on. See also https://vale.dev/
P.S Mind mentioning what FP-like features are in Rust? (Genuinely have not looked into Rust that much but I am interested).
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Austral: A Systems Language with Linear Types and Capabilities
An interesting design choice of Austral is the use of second-class references [0] in place of first-class references like Rust does. This makes the implementation of a borrow checker simpler at the cost of reduced expressiveness. Hylo (previously Val) [1] tries also to find a way of avoiding first-class references using value semantic and subscripts.
[0] https://borretti.me/article/second-class-references; [1] https://www.hylo-lang.org/
- The Hylo Programming Language
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Move semantics in Rust, C++, and Hylo
Q: What's "Hylo"?
A: It's another programming language with templates. It used to be called "Val". See: https://www.hylo-lang.org/
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Rewriting Rust: A Response
People interested in this should also make sure to checkout Hylo, https://www.hylo-lang.org
There are several presentations on the design and mechanisms. Eg
- Hylo programming language (formely Val)
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Vala Programming Language
Or Val[0], now called Hylo (for a good reason), or V[1].
[0] https://www.hylo-lang.org
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Cpp2 and cppfront – An experimental 'C++ syntax 2' and its first compiler
The evolution of C++ has been a multi-decade history of dealing with difficult reality.
I have great hope that Herb can create with his cppfront project “The Very Best of C++” to carry that tremendous legacy forward.
If I was to throw my hat into a “C++ successor”, it would be https://www.hylo-lang.org/ with its “all the safeties” and “tell you when you’re doing it sub-optimal” approach.
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Borrow Checking Hylo [video]
Paper: https://2023.splashcon.org/details/iwaco-2023-papers/5/Borro...
> Hylo is a language for high-level systems programming that promises safety without loss of efficiency. It is based on mutable value semantics, a discipline that emphasizes the independence of values to support local reasoning. The result—in contrast with approaches based on sophisticated aliasing restrictions—is an efficient, expressive language with a simple type system and no need for lifetime annotations.
> Safety guarantees in Hylo programs are verified by an abstract interpreter processing an intermediate representation, Hylo IR, that models lifetime properties with ghost instructions. Further, lifetime constraints are used to eliminate unnecessary memory allocations predictably.
https://www.hylo-lang.org/
https://github.com/Hylo-lang/Hylo
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A note from our sponsor - SaaSHub
www.saashub.com | 6 Sep 2026
Stats
Basic hylo repo stats
61
1,553
9.1
13 days ago
hylo-lang/hylo is an open source project licensed under Apache License 2.0 which is an OSI approved license.
The primary programming language of hylo is Swift.
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