SpellPrints

Prompt optimization, automated voice testing, monitoring, and more. Test your AI voice agent against 1000s of simulated users in minutes. AI voice agents are hard to get right. A small change in prompts, function call definitions or model providers can cause large changes in LLM outputs. We're the only end-to-end platform that supports you from development to production. You can store, manage, version, and keep your prompts synced with voice infra providers from Hamming. This is 1000x more efficient than testing your voice agents by hand. Use our prompt playground to test LLM outputs on a dataset of inputs. Our LLM judges the quality of generated outputs. Save 80% of manual prompt engineering effort. Go beyond passive monitoring. We actively track and score how users are using your AI app in production and flag cases that need your attention using LLM judges. Easily convert calls and traces into test cases and add them to your golden dataset.

Prompt Builder is a professional AI prompt engineering platform designed to transform simple ideas into polished, high-performing prompts for models like ChatGPT, Claude, and Google Gemini, in mere seconds. It features three core capabilities; Generate, which turns plain language descriptions into optimized prompts using over 1,000 proven templates; Optimize, refining existing prompts with advanced prompt-engineering techniques; and Organize, which helps users catalog their best prompts using tags, bookmarks, and folders. The tool also supports content tailored for social media platforms, such as Twitter, LinkedIn, Instagram, and TikTok, and enables crafting detailed image prompts for tools like DALL·E, Midjourney, and Stable Diffusion. Rated highly by professional users, Prompt Builder provides a centralized hub to generate, refine, and manage prompts across multiple AI models with consistency and ease.