img-forge v2

Prompt Guide & Gallery

How the pipeline transforms your words into images. Compare quality tiers and models, browse every image we’ve generated, and learn prompting techniques.

Explore Gallery Generate an image →
01 — Quality Tiers

Same prompt, different tiers

Each tier uses a different model. Draft runs SDXL Lightning for speed, Standard uses FLUX Klein 4B, Premium uses FLUX.2 Dev, Ultra uses Gemini 2.5 Flash, and Ultra+ uses Gemini 3.1 Flash for maximum fidelity. Higher tiers inject quality boosters and style defaults.

Red fox - draft
Draft
SDXL Lightning
“a red fox in a snowy forest”
No enhancement
a red fox in a snowy forest
Red fox - standard
Standard
FLUX Klein 4B
“a red fox in a snowy forest”
Enhanced to
a red fox in a snowy forest, high quality, detailed
Red fox - premium
Premium
FLUX.2 Dev
“a red fox in a snowy forest”
Enhanced to
a red fox in a snowy forest, masterpiece, best quality, highly detailed, sharp focus, 8k, photorealistic
Red fox - ultra
Ultra
Gemini 2.5 Flash
“a red fox in a snowy forest”
Enhanced to
a red fox in a snowy forest, highly detailed, professional quality, vivid colors, photorealistic
Red fox - ultra+
Ultra+
Gemini 3.1 Flash
“a red fox in a snowy forest”
Enhanced to
a red fox in a snowy forest, masterpiece, best quality, ultra detailed, 8k resolution, photorealistic
02 — UI Mockups

Generate UI concepts in seconds

Skip the blank canvas. Use img-forge to rapidly generate UI concept art — from lo-fi sketches on draft tier to polished visual mockups on ultra. Part of the Stackbilt ecosystem for shipping faster.

SaaS dashboard - Gemini 2.5 Flash
Featured
Ultra
Gemini 2.5 Flash
“a clean modern SaaS dashboard UI with analytics charts, dark theme, sidebar navigation, card-based layout, professional design”
UI sketch - SDXL Lightning
Draft
SDXL Lightning
“a sketch of a social media app profile page, pencil on paper style, lo-fi UI mockup”
Fintech landing page - Gemini 2.5 Flash
Ultra
Gemini 2.5 Flash
“a fintech landing page hero section, gradient background, 3d floating credit card mockup, headline text area, call to action button”
Healthcare portal - FLUX.2 Dev
Premium
FLUX.2 Dev
“a healthcare patient portal web application, appointment calendar, medical records sidebar, doctor profile cards”
Mobile onboarding - Gemini 3.1 Flash
Ultra+
Gemini 3.1 Flash
“a mobile app onboarding screen UI design, minimal white background, illustration of a person using a phone, sign up button, clean typography”
E-commerce product page - Gemini 3.1 Flash
Ultra+
Gemini 3.1 Flash
“an e-commerce product page UI showing a pair of sneakers, product image gallery, price and buy button, customer reviews section”
04 — The Pipeline

How enhancement works

Every prompt passes through a three-stage pure-function pipeline. No AI calls until generation — the enhancement is deterministic and transparent.

Example: “a robot” at premium tier
Input
a robot
Analyze
subject: a robot · style: none · complexity: simple · gaps: style, lighting, composition
Expand
a robot, masterpiece, best quality, highly detailed, sharp focus, 8k, photorealistic
Model
Premium tier → FLUX.2 Dev (25 steps, 1024×768)
Negative
Skipped — FLUX models do not support negative prompts. For Draft (SDXL Lightning), negative prompts are applied: lowres, bad anatomy, bad hands, text, error, blurry…
05 — Prompting Tips

Write better prompts

The pipeline helps, but a well-written prompt still makes the biggest difference. A few guidelines for getting the most out of each generation.

01

Be specific about your subject

“a robot” works, but “a weathered industrial robot standing in an abandoned factory” gives the model dramatically more to work with. Nouns and adjectives are your primary tools.

02

Name your style

The analyzer detects style keywords like watercolor, photorealistic, anime, oil painting, or 3d render. Including one steers the entire output and prevents the pipeline from injecting a default.

03

Mention lighting & composition

Terms like golden hour, dramatic shadows, close-up, or wide angle are detected by the analyzer. When present, the pipeline skips injecting defaults and trusts your intent.

04

Choose the right tier

Draft (SDXL Lightning) — fastest, free. Standard (FLUX Klein) — fast 4-step FLUX. Premium (FLUX.2 Dev) — 25-step generation. Ultra (Gemini 2.5 Flash) — Google’s multimodal model. Ultra+ (Gemini 3.1 Flash) — latest Gemini image generation.