16x Prompt solves a specific, practical problem: getting the right files and context into a prompt without manually copying and pasting code every time, and without blowing through a model's token limit by including everything. It runs locally, which keeps source code off third-party servers except for whatever actually gets sent to a chosen model.
It supports sending generated prompts to GPT, Claude, Gemini, or DeepSeek either by copy-paste or direct API calls, with token limit tracking so a developer can see how much of a context window a given selection of files is using. Side-by-side comparison of outputs from different models, workspace organization across multiple repositories, and a reversible code-edit feature with visual diffs round out the feature set.
It's a utility tool rather than a full coding assistant: its whole value proposition is making manual prompt construction faster and more controlled, for developers who prefer assembling their own prompts over handing full autonomy to an agent.