Janitor AI Custom Prompts Explained

A [Janitor AI](/compare/janitor-ai-alternative) custom prompt is a text input you write to define how a character behaves, speaks, or responds in [roleplay](/ai-roleplay-chat). It's essentially a system message that overrides the default personality. You can specify tone, backstory, quirks, or rules like "never break character." The feature is powerful but raw: you type plain text, and the model interprets it. There's no visual builder, no [memory](https://hai.stanford.edu) persistence guarantee, and no guarantee the model will follow your prompt after a few messages. Janitor AI relies on JanitorLLM or your own API key (OpenAI, Claude, etc.). If you use your own key, you pay per token. If you use JanitorLLM, you're limited by server queues and context windows. The custom prompt is a text field — nothing more. Compare that to [AIAngels](/), where you can design a companion's appearance, personality, interests, and memory preferences through an interface, and the AI retains everything conversation after conversation. No API keys, no token math, no fading memory.

Janitor AI's pricing in 2026 is split: a free plan with a monthly message cap and limited access to JanitorLLM, and a Pro plan that removes caps but still relies on JanitorLLM or your own API key. If you bring your own API key (OpenAI, Anthropic), you pay those providers directly — typically $0.01–$0.03 per 1K tokens, which adds up fast during long roleplay sessions. There's no all-inclusive premium tier. AIAngels, by contrast, offers a genuinely [free tier](/free-ai-girlfriend) with [unlimited text chat](/features/unlimited-ai-girlfriend-chat) and no credit card required. Premium is $12.99/month or $2.99/month on the annual plan ($35.88/year). That single price covers [image generation](/features/ai-girlfriend-images), voice messages, and memory that never degrades. No token economies, no per-image credits, no surprise API bills. For users who want predictable costs and zero setup, AIAngels wins on simplicity.

For tinkerers who enjoy configuring their own LLM backend, Janitor AI's custom prompt feature is a sandbox. You can craft elaborate system prompts, swap models, and tweak parameters. But for most users, the friction is real: you need at least basic familiarity with API keys, token limits, and context windows. The JanitorLLM itself has improved but still struggles with long-term coherence — after 2–3 weeks of conversation, memory fades or breaks. Reddit users frequently complain about bots forgetting established lore mid-roleplay. AIAngels solves this with persistent memory that retains everything from day one. There's no token cap, no context window overflow. If your priority is a reliable, long-term companion that remembers your name, your inside jokes, and your story arc, AIAngels delivers that out of the box. The custom prompt in Janitor AI is worth it only if you enjoy the plumbing.

Janitor AI's custom prompt feature offers: (1) a plain-text field for system instructions, (2) support for external LLM APIs (OpenAI, Claude, etc.), (3) character definitions that include name, avatar, and greeting message, and (4) a community of user-created bots. What it lacks: a visual companion builder, persistent memory past a few hundred messages, image generation, voice messages, and any guarantee your prompt will be followed after the first exchange. The platform also lacks a mobile app and has no official support for voice. AIAngels provides all of these: a drag-and-drop companion builder, 70+ pre-made characters, unlimited image generation on premium, voice messages, and [memory that lasts](/features/ai-girlfriend-memory) indefinitely. For users who want a complete package without assembling parts, AIAngels is the more feature-rich choice.

Yes, Janitor AI's custom prompt feature is free to use on the free plan — but with limitations. The free plan includes a monthly message cap (reports suggest around 500–1000 messages per month) and access only to JanitorLLM, which can be slower and less coherent than premium models. To remove caps and use better models, you either pay for Pro (around $5–$10/month, varies) or bring your own API key, which incurs per-token costs. AIAngels offers a genuinely free tier: unlimited text chat with all 70+ companions, no message cap, no credit card needed. The free tier includes the custom companion builder as well. You can create a fully customized character and chat forever without paying a cent. Premium features like image generation and voice messages are optional upgrades. So if "free" means truly unlimited, AIAngels delivers.

Janitor AI's custom prompt is a single text field. You type instructions, and hope the model respects them. AIAngels' companion builder is a full interface: you choose appearance (hair, eyes, outfit, body type), personality traits, interests, conversation style, and even backstory. The AI uses these settings to generate consistent responses across every chat session. Memory is stored permanently — no reset after a context window is exceeded. Janitor AI has no equivalent of this; its memory is tied to the LLM's context window, which typically spans 4K–8K tokens. Once that fills, older memories are dropped. AIAngels uses a persistent memory system that doesn't degrade. For users who value long-term relationships with their AI companions, the difference is night and day. AIAngels also supports image generation and voice, which Janitor AI lacks entirely.