rewriteInC is an automated C SDK generation platform for API providers. Its core goal is to convert OpenAPI specifications into pure ANSI C (C89) SDKs, allowing APIs to reach embedded systems, RTOS environments, legacy applications, and high-performance runtimes. Instead of maintaining a full SDK separately for each language, its approach is to generate a universal C SDK first, then use each language’s FFI to generate or write thin wrapper layers.
In terms of features, it emphasizes zero dependencies, low memory usage, and direct integration into customers’ build systems. The site states that generated SDKs can be compiled for RTOS, Linux, Android, Windows, and other environments, making it suitable for IoT, edge, and fleet management scenarios. The Pro plan supports GitHub/GitLab CI integration, so SDKs can be regenerated automatically when the API spec is updated, and it also provides a hosted SDK Artifact Repository.
rewriteInC’s primary generation target is ANSI C (C89). Its FFI approach covers Python, Node.js, Rust, Java, Go, Ruby, and other languages, and it claims extensibility to 40+ languages. The platform is built on an open-source core and lists several C/C89-related projects, including cdd-c, c-rest-framework, c-multiplatform, c-abstract-http, and c-orm. However, it is not clearly stated whether the SaaS platform itself is open source.
The Starter plan is free, limited to 50 API Endpoints, and only supports manual generation through the Web UI plus community support. Pro costs $499/month and includes unlimited Endpoints, CI integration, priority email support, and a 14-day trial. Enterprise pricing is custom and includes custom C templates, a 99.99% SLA, a dedicated customer manager, and Single Tenant/VPC deployment. For small teams, the Pro plan has a relatively high entry cost, but it may be worthwhile for API companies that need a stable SDK pipeline.
Its strengths are a very focused positioning, strong fit for C, embedded, and cross-language FFI scenarios, and the potential to reduce the maintenance cost of multi-language SDKs. The downsides are that the documentation pages explicitly say they are still being updated; integration guides, template customization, and CI/CD tutorials are not yet complete; and there is no disclosure of a SaaS API, CLI, payment methods, or more detailed OpenAPI compatibility information. It is best suited for platform teams with clear C SDK distribution needs, IoT/edge computing vendors, and API companies that need to support customers using legacy systems.
The site does not provide information about access from mainland China, payment methods, invoices, or localization support, so China access is currently unclear. If access or payment is restricted, alternatives such as OpenAPI Generator, Swagger Codegen, Kiota, Speakeasy, and Stainless may be worth evaluating, though these tools do not have exactly the same focus on C89, zero dependencies, and embedded compatibility.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on rewriteinc.io official site.
rewriteinc.io is an United States Dev Tools provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach rewriteinc.io directly.