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Solar

Solar is a Rust-written, modular compiler for Solidity, offered as a command-line interface and a library. Its repository also documents a Solidity-compatible C API, a WebAssembly build and a soljson-compatible JavaScript wrapper. The project describes itself as under active development and not feature complete.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Solar — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Consider Solar when exploring a Rust-based compiler for development workflows or building compiler integrations, while accounting for its stated active-development and incomplete-feature status.

Who it is for

  • Solidity developers who want a CLI compiler for development workflows.
  • Rust developers building tools that can integrate a compiler crate.
  • Tool builders seeking a Solidity-compatible C, WebAssembly or JavaScript compiler interface.

Documented uses

  • Compile a Solidity source file from the command line.
  • Send Solidity source through standard input for compilation.
  • Emit an ABI from a compiled contract.
  • Integrate a Solidity compiler crate into a Rust development tool.
  • Use the documented Standard JSON interface through the C API or JavaScript/WASM distribution.
Before you choose

Requirements & limits

The README lists prebuilt CLI binaries for macOS, Linux and Windows, and installation through Cargo. It also documents a Rust library and release distribution for WebAssembly and JavaScript.

  • Solar is explicitly described as under active development and not feature complete; its README advises against production use.
  • The README describes compatibility with Solidity’s 0.8.* breaking version but does not give a full feature-compatibility inventory.
  • The CLI and Rust library are distinct integration paths; C API, WASM and JavaScript usage are documented separately.
  • The C API uses Standard JSON input and output, and client code manages memory explicitly as described by the C header.
  • The repository shows MIT and Apache-2.0 license badges; the technical profile identifies Apache-2.0 as the license.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Install Solar and compile a Solidity file

Install the Solar CLI, then compile a contract file and emit its ABI.

Before you start

  • macOS, Linux or Windows for the documented prebuilt binaries; alternatively, use Cargo to install the compiler.
  • A Solidity source file to compile.

Steps

  1. Install Solar using the platform-specific command or Cargo method in the project README.

  2. Run solar -h to view available options.

  3. Run solar Counter.sol --emit abi to compile the file and emit its ABI to standard output.

Expected outcome

The README’s example produces ABI output for the supplied Solidity file.

Guide limitations

  • Solar is under active development and not feature complete; the README advises against production use.
  • The example documents the command, not a tested result or compatibility guarantee.
Documentation 1 ↗
Source-based practical guide

Add Solar as a Rust dependency

Declare the Solar compiler crate in a Rust project’s Cargo.toml.

Before you start

  • A Rust project with a Cargo.toml file.

Steps

  1. Add the documented solar dependency entry to Cargo.toml, using package solar-compiler and version =0.1.8.

  2. Consult the repository’s examples directory for library usage examples.

Expected outcome

The project manifest declares Solar as a Rust dependency; the README points to examples for further library usage.

Guide limitations

  • The documented setup does not by itself specify a compilation call or integration behavior.
  • Solar is under active development and not feature complete; the README advises against production use.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
9 October 2026
Original website title
paradigmxyz/solar · Official homepage title · retained in its source language
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