About Nebula
Nebula is Neptune's AI vision engine — built to bridge the gap between creative vision and generative AI output.
The Unified Streaming AI Engine
Nebula runs on a next-generation single-stage streaming pipeline — replacing the old two-step process with a unified forensic analysis and synthesis call that delivers results faster, with greater detail and accuracy.
Primary Model
Google Gemma 4 (31B) — Free
Vision-capable free model. Performs the complete forensic scan — lighting rigs, optics, colour science, composition, and prompt synthesis — in a single unified pass.
Free Router
OpenRouter Free — Auto-Select
Fallback to OpenRouter's intelligent free-tier model router, which automatically selects the best available free vision model for the request.
Universal Fallback
OpenRouter Auto — Any Model
Final fallback across OpenRouter's entire model catalogue, ensuring generation always completes even during peak availability periods.
Multimodal Vision
Analyzes images at the pixel level — extracting composition, color grading, lighting direction, depth of field, and stylistic references with expert precision.
Semantic Depth
Goes beyond surface-level description. Identifies artistic movements, camera lens characteristics, mood atmospheres, and technical parameters in any visual.
Prompt Synthesis
Converts raw analysis into structured master prompts — comma-separated, technically optimized, and precisely calibrated for Midjourney, DALL-E 3, Flux, and Stable Diffusion.
Our Mission
"Give anyone the ability to conjure exactly what they imagine — no matter their technical expertise."
Prompt engineering is a craft. The difference between a mediocre AI image and a breathtaking one often comes down to a few carefully chosen words, technical parameters, and artistic references that most people don't know to include.
Nebula was created to make that expertise universally accessible. Whether you're a professional designer, a curious creator, or someone who just saw an image they love — Nebula turns your vision into a production-ready prompt.
Our Values
Democratize Creative AI
Generative AI is incredibly powerful, but the skill gap between novice and expert prompts is enormous. Nebula closes that gap — making world-class AI generation accessible to everyone.
Precision Over Guesswork
Nebula doesn't generate vague suggestions. It produces comprehensive, technically-accurate prompts that actually work — analyzing composition, lighting, color theory, and artistic style references.
Community-First
The best prompts shouldn't be hoarded. Nebula integrates directly with Neptune's community feed, making it easy to share discoveries and learn from other creators.
Part of Neptune
Nebula is one of several tools built within Neptune — a creative platform for discovering, publishing, and remixing high-quality AI prompts. Neptune gives prompt creators a community to share their work, and Nebula gives them the engine to create effortlessly.
Explore Neptune