About this tool
What is the Prompt Builder?
The ReelStack Prompt Builder is a formula-based prompt composer for AI image and video generators (Midjourney, Flux, Runway, Sora, Veo, Kling, ComfyUI). Unlike random "AI prompt generators" that wrap a chat model, this tool exposes the exact axes a cinematographer or director would think about — camera body, focal length, lens type, film stock, lighting setup, atmosphere, color grade, framing — and assembles them into a clean prompt in the structure pro commercial workflows actually use.
The output isn't AI-generated text. It's a deterministic template fill: you pick "Arri Alexa Mini · 35mm anamorphic · Kodak 5219 · low-key key + neon practicals · misty atmosphere · cool teal-orange grade" and the prompt comes out the other end. That means it's free (no API cost on our side, no paywall on yours), reproducible (same selections always produce the same prompt), and editable (you can hand-tweak after).
Filmmakers use it as the starting point for every commercial shot, then iterate the result in Midjourney or Flux. The tool ships with 100+ curated film stocks, 50+ lens types, and lighting setups for every common scenario — interview, action, dialogue, performance, documentary, fashion.
FAQ · PROMPT BUILDER
Questions about the Prompt Builder
Is the Prompt Builder free?
Yes. Unlike AI-powered prompt generators that cost the operator API credits, this tool is a deterministic template fill — no LLM call, no per-use cost. Free forever, no signup, no premium tier.
Which AI image models does it work with?
The output works with Midjourney, Flux, Runway, Sora, Veo, Kling, ComfyUI, Stable Diffusion, DALL-E, Imagen, and any other text-to-image or text-to-video model. The prompt structure follows the conventions Midjourney and Flux respond best to, but the natural-language phrasing translates well across models.
What's the difference vs. a 'random AI prompt generator'?
Most 'AI prompt generators' just wrap GPT-4 with a system prompt — they produce different output each time, can hallucinate technical terms, and cost the operator money. Our tool is a template fill: you pick from curated cinematic options (real film stocks, real lens types, real lighting setups) and get a structured prompt. Deterministic, free, and grounded in actual cinematography vocabulary.
Can I save my prompt presets?
Signed-in ReelStack users can save unlimited presets and access them from any device. Anonymous users get local-storage presets that persist on the same browser. Either way, presets are free.
What does 'director-grade' actually mean?
It means the prompt names specific equipment and techniques the way a director and DP would discuss the shot. Instead of 'cinematic photo of a woman,' you get 'Arri Alexa Mini, 35mm anamorphic, Kodak 5219, low-key Rembrandt key + neon practicals, anamorphic flares, teal-orange grade, mid-shot.' AI models trained on photography metadata respond much more accurately to this kind of language.