SiChatAppHow this AI chat works without an account
- Type and send. The default model, DeepSeek V4 Flash, usually starts answering in about a second.
- Keep the conversation going. Follow-up questions remember what you said earlier in the same chat, because your browser sends the recent messages along with each new one.
- Sign in only if you want more. An account raises the free limit from 10 to 40 messages a day, saves your chats, and unlocks premium models.
There is no trial that expires and no card to enter. The free messages renew every day at midnight UTC, and the counter above the chat shows how many you have left.
Models in SiChat
| Model | Good for | Price |
|---|---|---|
| DeepSeek V4 Flash DeepSeek | Fast, sharp everyday answers | Free |
| GLM 5.3 Flash Zhipu | Thinks briefly before it answers | Free |
| GPT-OSS 120B OpenAI | OpenAI’s open-weight model | Free |
| DeepSeek V4 Pro DeepSeek | Deeper reasoning for math and code | ~3 credits / msg |
| GLM 5.3 Zhipu | Strong writer and planner | ~3 credits / msg |
| Kimi K2.6 Moonshot AI | Long, careful answers | ~3 credits / msg |
| Qwen3.8 27B Alibaba | Multilingual all-rounder | ~2 credits / msg |
Every model runs on Cloudflare’s network, close to you, which keeps answers fast. Reasoning models think for a moment before they reply — you will see “Thinking…” — and are better at math, logic and code.
What you can ask
- Writing: emails, cover letters, product descriptions, social posts, or a second opinion on your draft.
- Learning: explain a topic like you would to a beginner, then quiz me on it.
- Coding: explain an error message, write a function, convert code between languages.
- Planning: trips, workouts, study schedules and meal plans with a budget.
- Language: translate, rephrase more formally or casually, or practice a conversation.
Your privacy in a no-sign up AI chat
Guest chats are not stored on our servers. To count free messages we keep a daily counter tied to a one-way hash of your network address, not the address itself. Each message is checked by an automated safety filter and then answered by the chosen model; neither step keeps your text for training. Signed-in chats are saved so you can return to them, and deleting a chat removes it. The privacy policy has the full details. Please don’t paste passwords, card numbers or other secrets into any AI chat.
Free models or premium credits?
The free models handle everyday questions well. Premium models write longer, more careful answers and handle harder reasoning. They cost credits per message based on the actual length — Qwen3.8 27B averages about 2 credits for a typical reply — and you only pay for what the model writes. Credit packs start at $9.90 for 1,100 credits with no subscription; see SI chat pricing for every model.
Why choose an AI chat with no sign up
Most chat assistants ask for an email address, a phone number or a login before the first answer. That makes sense for long-term use, but it gets in the way when you only need a quick reply: checking a formula, rewriting one paragraph, or understanding an error message at work. An AI chat with no sign up removes that step and keeps your identity out of the conversation. It is also handy on shared or borrowed computers, where you would rather not log in at all, and for trying a model before deciding whether an account is worth it.
SiChat keeps the guest version genuinely useful rather than a teaser: the same free models signed-in users get, full follow-up context within a chat, tables and code blocks in the answers, and a clear daily allowance instead of a surprise paywall halfway through a reply.
In short: AI chat, no sign up, no catch. If you later want history across devices or premium models, the account is one click away — and if you never do, the guest chat keeps working every day.
Use it on your phone
The chat works in any modern mobile browser, with nothing to install. On iPhone, tap Share and then Add to Home Screen; on Android, open the browser menu and choose Install app or Add to home screen. The icon then opens SiChat full screen like an app, still with no sign up required, and your current guest conversation stays in that window until you close it.
Tips for better answers
- Give context: who you are, what you need it for, and how long the answer should be.
- Ask for a format — a table, steps, a short summary — and the model will follow it.
- Check important facts. AI chat can be confidently wrong, especially about recent events and numbers.
- Start a new chat for a new topic; long, mixed conversations confuse every model.
Want to compare these models with others before choosing? Our sister site OpenSI lists prices and features of hundreds of models side by side. For signed-in use with saved history, open the full chat app.
Questions about AI chat with no sign up
Can I really use this AI chat with no sign up?
Yes. Open the page and type. Guests get 10 free messages a day with the free models, and the counter above the chat shows how many are left. No email, no phone number and no card are needed.
Do you save my conversations?
Not as a guest. Your current chat lives only in this browser tab and disappears when you close it or press New chat. If you sign in, your chats are saved to your account so you can come back to them, and you can delete any of them at any time.
Which models can I use for free?
DeepSeek V4 Flash, GLM 5.3 Flash, GPT-OSS 120B. They run on Cloudflare and answer in a few seconds. Premium models such as DeepSeek V4 Pro, GLM 5.3, Kimi K2.6 need an account and a few credits per message.
What happens after my free messages run out?
Signing in raises the daily limit to 40 free messages. Beyond that you can switch to a premium model paid with credits, or come back the next day when the counter resets.
Is SI chat the same as AI chat?
Yes. SI stands for super intelligence, the name the US government adopted in September 2026 for what used to be called AI. SiChat is an AI chat assistant under the new name.
Questions or feedback? Email support@sichatapp.com.
