Comparison
Janitor AI vs SillyTavern vs NovelAI: which fits NSFW AI storytelling?
All three come up whenever adults look for AI roleplay without a mainstream filter, but they are not the same kind of product. Janitor AI is a hosted chat site, SillyTavern is software you run yourself, and NovelAI is a paid writing studio. Here is how they differ — and when none of them is what you actually want.
By ShortFling Editorial · Editorial team · Last checked: 2026-09
Key takeaways
- Janitor AI: a website for chatting with user-made characters; 18+ under its terms; free with its own beta model, or bring an external API.
- SillyTavern: a free, open-source interface you install locally; it has no model of its own, so you connect an API or run a model on your own hardware.
- NovelAI: a subscription AI writing and image service for adults (18+ under its terms) that encrypts stored stories in your browser.
- If you want finished stories to read or watch rather than to prompt, a story platform may fit better than any of the three.
The one-line difference
Pick Janitor AI if you want to open a browser and start chatting with a character. Pick SillyTavern if you want maximum control and do not mind setup. Pick NovelAI if you want to co-write long-form fiction with an AI rather than chat.
Landed here after hitting Character.AI's filter? Our explainer on whether Character.AI allows NSFW covers what its rules say and what changed in 2025.
Janitor AI
Janitor AI is a chatbot platform where users create and chat with custom AI characters for roleplay and interactive fiction.[4]
- Its terms of service say the platform is for users 18 and older, and its help center describes the service as intended only for an audience over 18.[1][2]
- According to an independent guide, it is free to use with its own model, JanitorLLM, which is labelled beta; you can instead connect an external API such as OpenAI, which that provider bills separately.[3]
- Community-run reverse proxies exist, but independent guides warn they can be slow and unstable.[3]
- It has a zero-tolerance policy on minors: characters must be defined as adults, and underage or minor-coded characters are prohibited.[2]
SillyTavern
SillyTavern describes itself as a locally installed user interface for text-generation models, image-generation engines and TTS voices. It is free and open source under the AGPL-3.0 license.[5][6]
- It needs Node.js 20 or newer to run.[5]
- It is only an interface: you need an LLM backend, either an API (for example OpenAI-compatible services, Claude, NovelAI or KoboldAI) or a model on your own machine.[5][6]
- For local inference its docs recommend an NVIDIA 3000-series GPU with at least 6 GB of VRAM.[5]
Because SillyTavern is software rather than a service, it does not set content rules for you — the terms of whichever AI provider you connect still apply, and you are responsible for how you use it.
NovelAI
NovelAI offers an AI story-writing tool and an anime-style image generator.[7]
- Its terms require users to be 18 or older.[9]
- Text stories are encrypted in your browser before they are stored, although the parts of a story sent for generation are processed unencrypted; NovelAI says that data is not stored or logged.[8]
- It runs on paid subscriptions, with one-time free trial actions for text and image generation after sign-up.[7][8]
Side-by-side comparison
| Janitor AI | SillyTavern | NovelAI | |
|---|---|---|---|
| Format | Hosted character chat | Self-hosted chat interface | Hosted AI writing studio + image generator |
| Setup | Account in a browser | Install locally (Node.js 20+) | Account in a browser |
| AI model | Own beta model, or connect an API | None built in — connect an API or run your own | Its own hosted models |
| Cost model | Free with its own model; external APIs billed by the provider | Free software; API or hardware costs are yours | Subscription, one-time free trial |
| Age rule | 18+ (terms of service) | Set by you and your model provider | 18+ (terms of service) |
| Privacy angle | Chats live on the service | Runs on your machine; data goes to whichever API you use | Stored stories encrypted in the browser |
| Best for | Jumping straight into roleplay | Tinkerers who want full control | Long-form co-writing |
When none of them is what you want
All three ask you to drive the story, message by message. Plenty of readers do not want to prompt at all — they want a finished, well-paced story with tension that pays off. ShortFling is built for that: romance fiction and reader-written serials today, vertical short dramas soon (in production; the first episode of each will be free), with an 18+ NSFW zone where every character is an adult. It is not an AI chat app. AI Star Mode, which will cast your own face as the lead of a short-drama template, is not live yet; there is a waitlist.
Frequently asked questions
Is SillyTavern better than Janitor AI?
It depends on what you value. SillyTavern gives you more control because you choose the model and run the interface yourself, but it needs setup. Janitor AI works in a browser straight away.
Is SillyTavern free?
The software is free and open source (AGPL-3.0). You still need a model: a paid or free API, or your own hardware for local inference.
Are Janitor AI and NovelAI 18+?
Yes. As checked in September 2026, both services' terms of service require users to be 18 or older.
Is ShortFling an AI roleplay app?
No. ShortFling does not offer chat with AI characters. It is a platform for romance fiction with an 18+ NSFW zone, with vertical short dramas in production.
Sources
- [1] JanitorAI Terms of Service (official)
- [2] JanitorAI Help Center — Minor Related Content (official)
- [3] Voiceflow — Janitor AI: what it is and how to use it (Feb 2026) (independent)
- [4] OpenRouter — Janitor AI app page (independent)
- [5] SillyTavern documentation (official)
- [6] SillyTavern on GitHub (official)
- [7] NovelAI website (official)
- [8] NovelAI Documentation — FAQ (official)
- [9] NovelAI Terms of Service (official)
How we write these guides: facts come from each service's own terms, help center, docs or announcements, with independent sources marked as such. We re-check every guide at least every 90 days.
Janitor AI, SillyTavern and NovelAI belong to their respective owners and projects. ShortFling is not affiliated with, endorsed by, or sponsored by any of them. Details change — check the official pages linked above before deciding.