An AI workspace for business teams
One workspace.
The right AI
for every task.
Describe a job in plain words. Model Stack picks the best model for it, does the work, and shows you what it cost.
No card needed to create an account.
Every leading AI model. One bill.
How it works
You ask. It picks the model. You get the work and the receipt.
No single model is best at writing, analysis, code and images all at once, and the leader changes every few months. Model Stack keeps up with all of them so your team doesn't have to.
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Describe the task
Type it the way you would brief a person.
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The right model does it
Model Stack chooses for you. No settings.
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Get the work and the receipt
Finished work, the model's name and the exact price.
These are real results from Model Stack. The model chosen depends on the task and changes as models improve.
Model Stack Code
Build it. Then just ask for changes.
Describe a booking page, a quote calculator or a script that tidies a spreadsheet. Watch the code being written, try the page right there, and change it in plain words.
- Tried before you get it. Every page is opened in a real browser and clicked through first.
- Only what you asked changes. “Make the button green” edits that line, not the whole file.
- Every version kept. Go back to an earlier one in a click.
- Yours to keep. Download the file, or open it in its own tab.
Add Saturday mornings and make the Book button green.
Added Saturday, 9am to 1pm, and made the Book button green.
booking-page.htmlVersion 3 · changed 2 parts14 <label for="day">Day</label>15 <select id="day">16 <option>Thursday</option>17 <option>Friday</option>18+ <option>Saturday, 9am to 1pm</option>19 </select>20 21 .book {22- background: #8a8f98;22+ background: #1b5e3f;23 color: #fff;24 }What it does
Hand off the work AI is good at.
The best model for each task
Writing, analysis, code and images each go to the model that is strongest at it. When a better one comes out, your work moves to it. You never switch tools.
Agents that know your business
Save a role and its instructions once. It remembers the lasting facts about your company.
Work that runs on a schedule
Set a task for every morning or every week. The result is waiting when you get in.
A browser that does the clicking
Ask for something on a website and watch it read, click and type in a private browser.
Finished where you need it
A document lands in Google Docs. An email opens in Gmail. Code gets a live preview. Images, voice-overs and short videos come from the same box.
Useful to every team on day one
For the person who pays
In control of the bill, and of who sees what.
- One bill for every model. No accounts with each AI company and no API keys to manage.
- A receipt on every task. The exact price, the model and the time. Export it all for your books.
- A limit for each person. Invite your team and set a monthly limit for everyone on it.
- See spending, never prompts. An owner sees who spent what. What each person asked stays with them.
Pricing
Pay only for what you run.
Use any model, and see the exact price of every task as it finishes.
Questions
Before you hand over the company card.
Put the right AI on every job.
Creating an account is free, and no card is needed to start.
Every task. Every team. One stack.
A team of AIs,
working for you.
The models behind Model Stack
Every task is matched to the models that suit it best. Ratings show how each one ranks against the others for a kind of work. Prices are what you pay. Speed is measured from real runs.
Billing
You pay for the tasks you run. Here's what you owe, your card, and every task's price.
Team
Invite people to run tasks under your business's billing. You see spend and activity per person — never their prompts or results.
Inviting people is part of the Business plan
$20 per person a month, and the whole fee comes back as AI usage. You get one bill for the team, a monthly limit for each person, and a view of who spent what.
Invite someone
Pending invites
Members
Memory
Model Stack can remember small, durable facts about your business — your industry, tone, recurring details — and quietly use them to sharpen future prompts. Nothing sensitive, and you're always in control.
What it remembers
Agents
An agent is a saved persona — what it should do and who it should act like — woven into every task you run while it's active. Start from an idea below, or build your own.
Ideas to start from
Build your own
Tell it what you want. We'll build it with you.
Describe the job in your own words. The builder asks a few quick questions, fills in the setup, and then saves it.
Your agents
Plugins
Connect your other accounts. Model Stack never sees your password for them. You approve access on the other service's own screen, and you can disconnect at any time.
Websites
Let Model Stack use the websites your business uses, like a person at a computer: it opens a private browser, looks at the page, and clicks and types for you. Add a website, then sign in once yourself in a live browser window. We don't keep your password, only the session the site gives that browser, and you can erase it with Disconnect.
Some websites' terms limit automated use. Only add sites you're allowed to use this way, with your own accounts.
What connecting Google does
When a task writes an email or a document, Model Stack can put it where you need it: a document becomes a Google Doc in your Drive. It can only open files it created itself and reads nothing else from your Drive. Emails get an Open in Gmail button that fills in a new message for you to read and send yourself; Model Stack never touches your Gmail.
Project
Tasks filed under this project.
In this project
Add tasks you've already run
Build an agent
Agents can write, analyze, plan and answer, read web pages you link to, act on the websites you've signed in to (see Plugins), and do all that on a schedule with each result saved for you. Not yet: searching the web, sending emails, or using other apps.