Diffyn VS siOsi

Diffyn's answer

Addresses workflow and change management on LLM prompts, provide teams with traceability and visualization of tests across multiple models, provide deeper understading into efficiency of these prompts.

siOsi's answer:

siOsi is the only tool that combines full 12-season color analysis with technical makeup diagnostics in one photo-based scan. Most tools do one or the other: a color quiz, or a makeup filter. siOsi reads your actual selfie to give your season, undertone, and palette, then grades your makeup through 15 diagnostic labs (flash white-cast, oxidation, coverage, longevity). Free, instant, no signup, in 9 languages.

Diffyn's answer

Diffyn is the platform that specializes on both change management and multi-model analysis.

siOsi's answer:

Competing color tools are quizzes that make you self-report answers you don't know, and in-person analysis costs $200–500 with analysts who often disagree. siOsi analyzes the actual photo, for free, with no signup for the first look. It also does something none of them do: diagnoses your real makeup application. You get both halves of "how do I look" in one place.

Diffyn's answer

React, Next.js, POSTGRESQL

siOsi's answer:

Next.js 16, React 19, and TypeScript on the frontend; Tailwind CSS with shadcn/ui and Radix; Supabase for auth, database, and storage; Capacitor for native iOS/Android; RevenueCat for subscriptions; Google Gemini and OpenAI vision models plus MediaPipe for face analysis; next-intl for 9-language localization; deployed on Vercel with Cloudflare.

Diffyn's answer

Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.

siOsi's answer:

Primarily women aged 18–35, from complete beginners to working makeup artists, and international (the app runs in 9 languages). It's mobile-first and appeals to anyone into color analysis, makeup, or a glow-up who wants a real answer without paying for a consultant.

Diffyn's answer

I started working on Diffyn when I notice that prompting has become an essential part of work across many industries. While there are version control platofrms like github, they are not designed for just prompt management are can be overkill such applications, it is also not integrated natively with various LLMs and relevant tools for users to validate ideas and visualise results properly.

siOsi's answer:

The web is full of "what's my color season?" questions with no good answer: quizzes can't see you, and professional analysis is expensive and gatekept. I wanted to give anyone a real, photo-based answer for free. Then I realized "your colors" is only half the story, so I added makeup diagnostics no other tool offers, grading how your makeup actually performs in photos and real light.

siOsi's answer:

Individual consumers (B2C); launching publicly August 2026.