Find the words
Work on an email, a story, or a message that needs a softer landing. Keep shaping it until it sounds like you.
“Make this clearer without making it formal.”
A familiar voice. Room to think.
Chat with GPT-4o again.
The messy first draft. The idea you can't quite explain. The conversation you want to get right. Bring it to a calmer space, with the warmth and creativity of GPT-4o.
No account or card. Up to 5 guest chats per UTC day, 10 per UTC month. Guest chats aren't saved.
You don't need a perfect prompt
I have an idea, but it's still a bit of a mess.
Messy is a perfectly good place to start. Tell me the rough version, and we'll find the part worth building on.
Example conversation. Responses vary.Less setup. More conversation.
A little back-and-forth goes a long way.
Ask a follow-up. Change direction. Say “make it sound more like me.” Fouro gives the conversation room to develop, without a model menu to manage.
Try it first. Create a free account when you want to save future conversations.
Try a guest conversationFouroGPT-4o
Help me say no to a project without sounding cold.
Warm and clear can fit in the same sentence. Try this:
“Thanks for thinking of me. I can't give this the time it deserves right now, so I'll need to pass. I hope it goes really well.”
A little more casual?
“Thanks for asking! I'm a bit stretched right now, so I'll have to sit this one out. Hope it goes great.”
Why Fouro
The model you came for.
Every Fouro chat uses GPT-4o through OpenRouter. Its conversational style is the reason this app exists. If GPT-4o is unavailable, you'll see a service error; Fouro does not silently switch to another model.
Fouro is an independent app with its own design and instructions. Responses can differ from ChatGPT.
A few places to begin
For what's on your mind, and on your to-do list.
Untangle an idea
Explore a half-formed thought, compare your options, or turn a long list into a manageable next step.
“Help me work out what matters most here.”
Talk it through
Reflect on your day or rehearse a tricky conversation. Ask for a different perspective, a question, or just a shorter answer.
“Ask me one question at a time.”
Simple pricing
Start free. Make room for more.
Free account
$0
A place to come back to.
- 10 chats per UTC day, up to 100 per UTC month
- Saved conversation history
- Up to 20 user-controlled memories
- No payment card required
Fouro Pro
7 days free then $25 USD / month
For a regular part of your day.
- Everything in Free
- No Fouro daily or monthly product chat-count limits
- Choose your AI name
- Set your preferred tone and response style
Eligible accounts only. Card required. $0 at checkout; renews automatically unless canceled before the trial ends.
Create account & review trialOne introductory trial per eligible account. Payment method required; $0 today. Unless canceled before the 7-day trial ends, Pro renews automatically at $25 USD/month. Cancel through Stripe from Billing & subscription; access continues through the trial or paid period. Provider, token, storage, concurrency, and service-safety limits still apply.
Good to know
A few things you might be wondering.
Do I need an account?
No. Try up to 5 guest chats per UTC day and 10 per UTC month per browser installation. Guest chats disappear on refresh or close and won't transfer when you sign up.
What will Memory remember?
Signed-in accounts can save up to 20 memories. Fouro can suggest useful, lasting details for you to approve. Review, edit, or delete saved Memory at any time; a full account never silently loses an old memory.
Does it work like the old ChatGPT?
Fouro uses OpenAI's GPT-4o API model with its own instructions and interface. It does not reproduce ChatGPT's private prompts, routing, tools, or complete experience. Fouro is not affiliated with or endorsed by OpenAI.
When do free chats reset?
Daily allowances reset at midnight UTC; monthly allowances reset on the first day of each UTC month. A chat request counts once an answer begins, including an answer you stop.
How is my data handled?
Guest chats are not stored in Fouro history or Memory. Signed-in chats and memories are account-scoped. Requests are processed by OpenRouter and the upstream model provider. See the Privacy Policy.
Can I cancel Pro?
Yes. Open Billing & subscription to cancel through Stripe before the next charge. Access remains active through the trial or paid period.
Can I rely on every answer?
AI can make mistakes. Check important information. Fouro is for conversation, writing, and reflection; it is not a therapist, emergency service, or substitute for professional advice.
Will GPT-4o always be available?
Availability depends on the model providers. Fouro cannot promise permanent access and won't silently replace GPT-4o if it becomes unavailable.
Start wherever you are
Bring the unfinished thought.
Try a conversationNo account or card needed.