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Models & Infrastructure

Civitai

Database · Models & Infrastructure

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Civitai is a community-driven hub for the Stable Diffusion ecosystem where creators upload and share model files (checkpoints, LoRAs, textual inversions, and related resources) for others to download and use in their own generation setups. Using it as a product means two distinct workflows: browsing and downloading SafeTensors model files to run in your own local setup, or staying entirely in-browser and using the built-in Generator to run hosted models directly, plus an on-site trainer that turns uploaded images into a new downloadable LoRA. Civitai hosts one of the largest concentrations of adult-content-oriented models and imagery in the open Stable Diffusion community, governed by a tiered content-rating system.

VISIT

At a glance

Primary useBrowsing/downloading Stable-Diffusion-family model files, plus in-browser generation and LoRA training

Access typeHosted web app (models used locally or on-site)

AI modalities

Image generationVideo generationModel file hostingLoRA training

Interaction typeSearch and download model files; in-browser Generator; on-site training pipeline

CustomizationBase model choice, LoRA/embedding stacking, Draft Mode, training data source and captioning method

Access modelFree browsing and downloads; Buzz currency and paid membership tiers for generation and training

Pricing structureFree daily Buzz allotment, purchasable Buzz, and Bronze/Silver/Gold monthly memberships with scaling Buzz and job-queue limits

APIPublic REST API for models/images/creators; separate Orchestration API for submitting generation jobs

Platform availabilityWeb

Content policyFive-tier content rating (PG–XXX) applied per image; realistic real-person likenesses prohibited platform-wide; sexual depictions of minors prohibited outright

VISIT

Overview

Civitai is a community platform built around the Stable Diffusion family of models: creators fine-tune or otherwise build model files and upload them for others to browse, download, and use. The core resource types are full checkpoints (complete fine-tuned models, for example specific to an anime style, a photorealistic look, or a particular character) and LoRAs (smaller adapter files layered onto a base checkpoint to add a character, style, or concept). The core of using Civitai as a product is search: filtering the library by base model (SD 1.5, SDXL, Flux, and others), resource type, and content rating, then downloading a SafeTensors file to load into local software such as ComfyUI or AUTOMATIC1111. Model listings show version history, example images, and community ratings, so a download decision is typically made by comparing sample outputs and version notes rather than the file alone.

Using the in-browser Generator

Beyond hosting files, Civitai runs an on-site Generator that lets users run a rotating selection of hosted checkpoints directly in the browser without installing anything locally. Because running every uploaded checkpoint isn't technically feasible, Civitai uses an auction system: creators and users bid Buzz to determine which roughly 200 checkpoints are loaded into the Generator each week, while LoRAs, textual inversions, and embeddings remain continuously available rather than rotating. Beyond a plain text-to-image pass, the Generator offers built-in enhancement workflows selectable per job: Face Fix, a low-denoise image-to-image Hi-Res Fix pass, and a combined Hi-Res Face Fix. A Draft Mode trades quality for speed and cost, generating faster low-cost previews at a fixed batch of 4 images with several advanced options locked. Generated images that aren't posted publicly are retained for 30 days before deletion, and users can rate a generation to flag quality problems, which can trigger an automatic partial Buzz refund.

Training a LoRA on-site

Civitai's on-site trainer removes the need for local GPU hardware to fine-tune a LoRA: a user selects a base model family (SD 1.5, SDXL variants like Pony Diffusion or Illustrious, Flux, or several video base models), supplies training images (pulled from prior Generator output, profile uploads, a saved dataset, or a ZIP of image/caption pairs) and captions them either with an automatic tagger or by hand. Training cost in Buzz starts at a base rate for standard models and scales up with settings like epoch count and repeats; jobs that fail are automatically retried and refunded. Finished models can be downloaded per epoch or published directly to Civitai, and up to five training jobs can run in parallel on one account.

Model file ecosystem

Civitai's library spans checkpoints built on Stable Diffusion 1.x/2.x, SDXL-class models, Flux, and other base architectures, alongside a large number of LoRAs for specific characters, art styles, clothing, poses, and other concepts, typically distributed in the SafeTensors format.

Content classification and moderation

Civitai governs content visibility with a five-tier rating system (PG, PG-13, R, X, and XXX) applied primarily to images, with model resources separately flagged as NSFW to keep mature-themed models out of PG and PG-13 feeds. New users default to the PG level and can opt into higher tiers, and ratings are produced through a mix of automated image tagging, community voting, and manual moderator review for flagged content. Civitai's published safety policy prohibits photorealistic depictions of minors and all sexual depictions of minors (including stylized genres), and, as a platform-wide rule, prohibits content that reproduces the likeness of a real, identifiable person in any context.

Site structure and policy evolution

Civitai currently splits its content across two front doors: civitai.com functions as an all-ages-safe entry point with card-based payments and the full creator program, filtering out adult-rated content entirely, while civitai.red presents the same underlying catalog, generator, and community without that filtering, using alternative payment methods. Civitai has stated this split exists in large part because payment processors are more comfortable with mature content being walled off from the mainstream-facing site.

Policy history

Civitai's content and moderation policies (including what's allowed, where, and under what rating) have changed more than once as the platform has adjusted to outside pressures like payment-processor requirements. This profile describes only the currently published structure and policies, not the specifics of past changes.

Buzz, account tiers, and pricing

Browsing and downloading most models is free. All users receive a free Buzz allotment every 24 hours just for logging in, plus additional Blue Buzz earned by engaging with the site. Paid membership sits in three tiers (Bronze, Silver, and Gold) each adding a larger monthly Buzz grant, a purchase-bonus percentage on bought Buzz, a multiplier on the daily free-Buzz reward, more private model training slots, a higher per-job image count and queued-job limit in the Generator, and ad-free browsing; Gold adds the largest allotment and an animated profile badge.

API and integrations

Civitai publishes a public REST API for browsing and downloading models, model versions, images, creators, and tags, documented separately from an Orchestration API used to submit generation jobs (image, video, and other workflows) programmatically using a bearer token, which makes it possible to script bulk downloads or plug Civitai-hosted models into an external pipeline instead of using the website by hand.

Limitations

Not every uploaded checkpoint is available in the in-browser Generator at a given time: Generator access to individual checkpoints rotates based on the auction/coverage system, so a model that's downloadable in the library may not be immediately runnable on-site without waiting for a rotation or running it locally instead.

Important distinctions

Civitai is a community distribution and generation hub for models, not a model developer: the checkpoints and LoRAs hosted there are built by community creators, frequently on top of base models released by organizations like Stability AI. It's also a different kind of platform than general-purpose model repositories like Hugging Face: Civitai is organized specifically around the Stable-Diffusion-style image and video generation community, with content rating, a Buzz economy, and an in-browser generator built around that use case, rather than hosting arbitrary machine learning models across domains.

Technical context

Civitai resource labels map to distinct compatibility ecosystems; a declared base matters for checkpoints and LoRAs.

Stable Diffusion 1.5A 512-pixel latent-diffusion base used by many checkpoints, LoRAs, ControlNets, and local interfaces.Stable Diffusion XL (SDXL)A larger latent-diffusion family with dual text encoders, multi-aspect training, and an optional refinement stage.Pony Diffusion XLAn SDXL-derived illustration model whose prompt conventions and adapter compatibility became a distinct community ecosystem.Illustrious XLAn SDXL-based illustration foundation documented as a training base for high-resolution anime-style fine-tunes and adapters.NoobAI-XLAn Illustrious-lineage SDXL illustration family with its own tagged training distribution and downstream compatibility identity.Model Fine-Tuning and Adaptation EcosystemsThe datasets, captions, trainers, base models, adapters, validation, formats, and hubs that turn general models into specialized systems.

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