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Created a desktop dev tools app entirely using Claude design and Claude sonnet

Reddit · bolorundurowb · May 24, 2026
A developer created dev-core-tools, a free and open-source desktop application for common development utilities, after finding existing solutions like CyberChef and DevToys insufficient for their needs and concerned about trusting random websites with sensitive data. The developer used Claude design credits to refine the product requirements and visual direction, then leveraged Claude Sonnet 4.6 to assist with architecture, tech stack decisions, and implementation. The application was completed and released within a few days of initial development.

Detailed Analysis

A software developer has publicly shared the creation of an open-source desktop developer tools application called dev-core-tools, built primarily through an AI-assisted workflow leveraging both Claude's design capabilities and Claude Sonnet 4.6. The developer's motivation stemmed from privacy concerns with existing web-based developer utilities — tools that require pasting potentially sensitive data into third-party websites with no guarantees about how that data is stored or used. Rather than accept the tradeoffs of existing solutions like CyberChef or DevToys, the developer opted to build a self-contained local application, using Claude design credits to refine product requirements and visual direction before engaging Claude Sonnet to assist with architecture, tech stack decisions, and implementation. The entire substantive development phase was completed within roughly two days of iteration.

The project illustrates a growing use pattern for large language model assistants in software development: not merely as code completion tools, but as collaborative design and architecture partners across the full product lifecycle. The developer explicitly used Claude across multiple stages — requirements gathering, UX direction, technical design, and code generation — compressing what might otherwise be a weeks-long solo project into a matter of days. The decision to release the project as free and open-source software signals that the developer views the output as genuinely production-worthy, not merely a prototype or experiment, which reflects increasing developer confidence in AI-assisted software quality.

The privacy motivation at the heart of dev-core-tools speaks to a broader and underappreciated tension in the developer tooling ecosystem. Developers routinely paste API keys, JWT tokens, encoded secrets, and other sensitive artifacts into web-based utility sites to perform quick transformations or inspections. The normalized reliance on these sites represents a real but diffuse security risk that most individuals accept out of convenience. A locally running, open-source alternative addresses this threat model directly, and the fact that AI assistance made building such an alternative tractable for a single developer in a weekend suggests that the barrier to building privacy-preserving local tooling has dropped considerably.

More broadly, this project exemplifies a trend in which AI models like Claude are enabling individual developers to close the gap between personal frustration and deployable solution. Historically, the cost of building, designing, and maintaining even a modest desktop application was high enough that most developers either tolerated suboptimal existing tools or abandoned their ambitions early. The combination of AI-assisted design systems and LLM-powered code generation now allows a single motivated developer to produce software with coherent UI/UX, considered architecture, and functional polish on a compressed timeline. As these workflows mature and more developers share similar experiences publicly, the aggregate effect on the open-source ecosystem — particularly in the tooling and utilities space — is likely to be significant.

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