Simulacrum VS Shapeless

Compare Simulacrum vs Shapeless and see what are their differences.

Simulacrum

First class syntax support for type classes in Scala (by typelevel)
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Simulacrum Shapeless
1 13
937 3,370
0.1% -
3.7 7.3
3 months ago 10 days ago
Scala Scala
BSD 3-clause "New" or "Revised" License Apache License 2.0
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

Simulacrum

Posts with mentions or reviews of Simulacrum. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-08-10.
  • Friction-less scala - Tell us what is causing friction in your day-to-day life with Scala
    14 projects | /r/scala | 10 Aug 2021
    The Cats ecosystem offers mature named abstractions providing algebraic laws virtually identical to those offered by Haskell and PureScript and that have stood the test of time, at the cost of relying on a "design pattern" approach to implementation you have to squint a bit to see ("typeclasses" based on higher-kinded types and implicit arguments) and that sometimes doesn't play nicely with Scala's colored local type inference. The selling point of this, coupled with parametricity ("tagless-final style"), is the ability to reason algebraically about your code.

Shapeless

Posts with mentions or reviews of Shapeless. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-07-06.
  • Question regarding Recursive datatypes and cats typeclasses (Haskell to Scala)
    3 projects | /r/scala | 6 Jul 2023
    Scala 2-only: * Shapeless (there is Shapeless for Scala 3 but less often needed as basic things are in Scala 3)
  • Is there the equivalent of this in Scala ? (Maps to Struct)
    1 project | /r/scala | 27 Dec 2022
    This is the FromMap typeclass in Shapeless. Note that there’s a companion syntax package for it providing .toRecord for any Map and an appropriately-structured Record (and a Record is the LabelledGeneric representation of a case class).
  • Scala 3: modifying product types in compile-time
    1 project | /r/scala | 14 Jul 2022
    If that's what you want, you can use Shapeless' records and HList. You can probably replicate this in plain Scala 3 with tuples and literal types as you said. It won't play nice with your others libs though but maybe there are integrations.
  • Does Scala have support for Dependent types?
    1 project | /r/scala | 19 Jun 2022
    See the Shapeless Sized example.
  • How does Scala's type system compare to TypeScript's? Is it as powerful?
    1 project | /r/scala | 19 Jun 2022
    Shapeless has Sized: https://github.com/milessabin/shapeless/blob/v2.3.9/core/src/main/scala/shapeless/sized.scala
  • Fp libraries that target scala 3 exclusively?
    5 projects | /r/scala | 22 Nov 2021
    I know that libraries like Scodec and shapeless were rewritten practically from scratch for Scala 3, taking advantage of the next syntax and internals, as well as protoquill - a Scala 3 implementation of Quill.
  • Delphi 11 Alexandria Has Been Released
    4 projects | /r/programming | 23 Sep 2021
    please show me something like this: https://akka.io/ or this: https://zio.dev/ or this: https://github.com/milessabin/shapeless
  • 6 Years of Professional Clojure
    6 projects | news.ycombinator.com | 2 Aug 2021
    That largely depends on the type system. Languages like Haskell and Scala which have much more powerful type systems than C/Java/Go/etc absolutely do allow you to do those sorts of things. It is a bit harder to wrap your head around to be sure and there are some rough edges, but once you get the hang of it you can get the benefits of static typing with the flexibility of dynamic typing. See https://github.com/milessabin/shapeless or a project that I've been working on a lot lately https://github.com/zio/zio-schema.
  • Scala3: Does it provide a simplified way of doing n-term generic parameters?
    2 projects | /r/scala | 6 Jun 2021
    Just use cats and use the apply syntax .mapN for this. Seriously. There isn't a way to do it without generating source code that I can see in the api. Scala 3's HList Tuples aren't like Shapeless 2's HLists and I can't figure out a way in the api to reduce the tuple members down from (A, B, C, D) into an E, generically, yet with Scala 3 poly functions, unlike what you could do in Shapeless 2 with HList
  • Scala: A Love Story
    4 projects | dev.to | 21 Apr 2021
    Scala has sparked a huge ecosystem of very high quality libraries (Cats, Scalaz, shapeless, to name but a few). I think a major reason for this is that Scala attracts developers who value the advantages of the JVM, but are fed up with the limitations of the Java programming language and understand the benefits of an expressive type system and functional programming.

What are some alternatives?

When comparing Simulacrum and Shapeless you can also consider the following projects:

Ammonite-Ops - Scala Scripting

cats - Lightweight, modular, and extensible library for functional programming.

Freestyle - A cohesive & pragmatic framework of FP centric Scala libraries

magnolia - Easy, fast, transparent generic derivation of typeclass instances

Quicklens - Modify deeply nested case class fields

Monocle - Optics library for Scala

scribe - The fastest logging library in the world. Built from scratch in Scala and programmatically configurable.

Scalaz - Principled Functional Programming in Scala

LArray - Large off-heap arrays and mmap files for Scala and Java

Chimney - Scala library for boilerplate-free, type-safe data transformations

enableIf.scala - A library that toggles Scala code at compile-time, like #if in C/C++

scala-newtype - NewTypes for Scala with no runtime overhead

InfluxDB - Power Real-Time Data Analytics at Scale
Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
www.influxdata.com
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