Make a temporary base with no sign-up

A temporary base lets you try Base Captain with no sign-up and no payment method: a real base, made in a few seconds from an app, such as Hair salon, with its sample data. Change it as you like: add a field, ask the assistant, add your own items.

A temporary base is open for 24 hours. When you like it, click Sign up to keep this base.: you sign up, or sign in if you are a user of Base Captain already, check your base's name, and it is your base on the Free plan, with all you put in it (Keep a temporary base as your own). If you do not keep it, it closes, and a day later it is deleted for good.

A temporary base is only for a first try with no sign-up. When you are signed in, Create your base makes your base at once (Create your base).

A temporary base is made from this site's homepage or an app's page, with one click and no sign-up. Anyone may make one.

1. On this site's homepage, write what your business does in the box at the top, then click Create my base now. On an app's page (Apps), Try it free makes a base from that app.
2. The page says "Making your base" while it works, with short lines under it. First, it checks that you are a person. It asks for a click only when it needs one. If you wrote what your business does, it then picks the app and the add-ons that fit your business and makes a short name for the base from your words.
3. The base opens, and you are signed in as its admin, in this browser. You pick nothing: change the app and the add-ons after, with the assistant.

The assistant's first message

The assistant of a new temporary base opens at the right of the base. Its first message tells you what was made, such as "I've made Corner Salon for you, with the app Hair salon." and says that it added example data so you can test the app, and that it can add or remove features for your business. Under the message, click What can this app do? to ask. The first message shows once: if you reload the page, it is gone. The assistant's History holds the app's sample chats, example conversations about the sample data.

If Base Captain has no app made for your kind of business yet, the first message says so, and the base is made with the closest app. You can ask the assistant to change it.

The base's name and what your business does

If you wrote what your business does, the temporary base gets a short name made from your words, such as "Corner Salon". Else, its name is the app's, such as "Hair salon". You can change the name when you keep the base (Keep a temporary base as your own).

The temporary base keeps what you wrote about your business. Its assistant knows it, so its answers and changes fit your business. When you keep the base, the text goes with it.

From an app's page, or when you are signed in

On an app's page, click Try it free: it makes a temporary base from the app with its sample data and the add-ons it has by default, in the same way, and the assistant tells you which app it is (Try an app with no sign-up).

If you are signed in, the homepage's box and an app's Try it free open Create your base with what they carry: a name made from what your business does or the app's name, and the app with its add-ons. Click Create my base: it makes your base at once on the Free plan, and the base stays (Create your base).

Limits and details

• If your words say nothing about a business, such as a greeting or a question, the page makes no base. It says "We could not tell what your business does. Write what you sell or do, and who your customers are.", with your words in the box and some examples. Write more and click the button again.
• The page picks the app and the add-ons for you a limited number of times in 24 hours. After that, or when it cannot do it, the list of apps comes with nothing picked: pick the app and the add-ons you want, then click Create my base. On a busy day the list can come sooner.
• If you reload the page while it makes the base, it makes no second base: it opens the one it made.
• You may make a limited number of temporary bases in 24 hours. Past it, a new one is refused: "You made many temporary bases in the last 24 hours. Try again tomorrow, or sign in and create your base."
• When too many temporary bases are open on Base Captain, a new one is refused for a time: "Too many temporary bases are open now. Try again later."
• A refused page shows the sentence, with a link back to where you came from. After a refusal, the page asks you to pass the check that you are a person again.

A temporary base is open for 24 hours from the time you made it, then closed for 24 hours, then deleted. Visits do not add time, and signing in does not add time.

• While the temporary base is open, a banner at the top of every page shows the time left, such as "This base closes in 23 h 14 min.", with Sign up to keep this base. You cannot close the banner. In the last hour it turns red.
• When its time ends, the base is closed for the next 24 hours. Its address shows one page only: "This temporary base is closed. Sign up to keep it. It is deleted in 21 h.", with the same button. Nothing in it changes, and its API and the AI tools refuse with the same sentence. You can still keep it, and it opens again as your base.
• 24 hours after it closes, the base and all its data are deleted for good. Nobody can bring them back.

A temporary base reaches nobody but you. Until you keep it, a temporary base does not:

• send mail, to anyone;
• invite other users: you are its only user;
• run AI other than the assistant: no AI step of a workflow, no automation's AI and no AI agent of its modules;
• show public forms, or take incoming webhooks;
• give public file links or calendar links;
• call outside services from its code;
• pair machines;
• get its own address: its address is made of random letters and digits;
• export its data.

Limits and details

• When you try one of these in the base, such as an invitation or an export, it says "A temporary base cannot do this. Keep this base to do it."
• The public addresses do not exist on a temporary base: a public form, an incoming webhook, a public file link or a calendar link answers "Not found".
• A temporary base holds 100 MB of data and files. When it is full, it says "This temporary base's storage is full (100 MB). Keep this base to have more."
• The AI of a temporary base has a fair-use limit, enough for a few changes. Past it, it says "The AI has reached this temporary base's fair-use limit. Keep this base to use more AI." On a busy day it can stop sooner: "The AI of temporary bases has reached its fair-use limit for today. It works again tomorrow at 00:00 UTC. Keep this base to use more AI now."
• A temporary base made from a script has no assistant.

Keeping a temporary base makes it your base on the Free plan, with your changes and your items, and needs no payment method and no payment. Only the person who made the base can keep it: in the browser where they made it, or from the link their AI gives them (Connect Claude, ChatGPT or Claude Code).

1. Click Sign up to keep this base., on the banner or on the closed page.
2. Enter your Email and click Continue. If no user has the address, we mail you a code at once: enter it, then your name, and you are signed up (Sign up for Base Captain). If you are a user already, sign in with your password or a code we mail you. Or sign up or sign in with Google or Microsoft. The base is now yours.
3. The Keep this base page opens: "Corner Salon becomes your base, with its data. It does not close." Its Name of the base is filled with the temporary base's name: change it if you like.
4. Click Keep this base. The temporary base becomes your base at once, on the Free plan (What the Free plan includes): nothing moves.
5. The base opens, with your changes and your items. It gets an address made from its name. The banner and the limits of a temporary base are gone, and the clock stops; it is on the Free plan now, and the 30 days count from the moment you keep the base (When the Free plan ends).

If you leave the page before you keep the base, it stays yours, with the time it had left. Open the base again and click Sign up to keep this base.: the same page opens. Your AI can keep it too: ask it to keep the base, and tell it your base's name. It keeps the base on the Free plan.

Limits and details

• Another browser that opens the base's address goes to the sign-in page, and a signed-in user who is not one of the base's users has no access to it. The base's keep page, and the API, tell anyone else "Only the person who made this temporary base may keep it."
• If you reached the free bases one person may have, the keep page says so above the name, such as "You have 3 free bases. Upgrade one to Pro or delete one to make another base.", and the button is greyed out. Upgrade one of your bases to Pro, or delete one, then keep this one (Create a base).
• Once you have signed in, the base opens only when you are signed in: the browser's session from before, and an API token made with the base, no longer open it. Your AI that made the base for you goes on working on it, now as you.
• If you wrote what your business does when you made the base, that text is its About this base, in Settings, General (Name your base, describe it and keep the company’s details).

A script may make a temporary base of Base Captain with no token. Send the app's name, as in its page's address on this site (hairsalon for /apps/hairsalon), then the add-ons you want with it:

POST https://www.basecaptain.com/api/auth/temporary-bases with {"modules": ["hairsalon"], "description": "We cut and colour hair.", "name": "Corner Salon"}

• name, the base's name, is optional. Without it, the base has the app's name, such as "Hair salon". The same rules as for the name of any base apply to it.
• description, what the business does, is optional. It becomes its About this base, as for a base made on this site, and it stays when you keep the base (Keep a temporary base as your own).

The answer gives the base in base (its slug, name, url, the time it closes, closes_at, and the time it is deleted, deletes_at), an API token in token, and open_url. The token reaches this base alone. Send it as Authorization: Bearer <token> to the base's API, as for any base (Use your base from a script with an API token), and to Base Captain's MCP server, https://www.basecaptain.com/mcp, which gives it the base's tools. open_url opens the base, signed in, in a browser: it works once, for 10 minutes. The browser that opens it may keep the base. GET /api/base gives the base's temporary: when it closes, when it is deleted, whether it is closed, and its keep_url, the page of Keep this base.

Find the app that fits a business

To find the app and the add-ons that fit a business, send what it does, also with no token:

curl -X POST https://www.basecaptain.com/api/auth/temporary-bases/recommendation \
  -H 'Content-Type: application/json' \
  -d '{"description": "We cut and colour hair, two chairs, and sell shampoo."}'

The answer's recommendation gives the app in module, the add-ons that the description asks for in modules, the reason in why, and a short name for the base, made from the description, in name (the app's name when no name is made). Send the app's name, then the add-ons' names, as the modules of the base you make, and the name as its name.

• recommendation is null when no app fits, after a limited number of recommendations from one address in 24 hours, and on a busy day. Then no_app says why: "unclear" when the words say nothing about a business, and "unavailable" when a limit or a failure stopped it.
• closest is true when no app was made for the business's trade and module is only the closest one.
• The same route under the token of your AI that you connected with Continue without signing up, and its list_modules tool with a description, give the same answer.
• This site's page sends the recommendation with the token of the check that you are a person. Its answer then also gives a pass, which the page sends with the base it makes, in place of a second check. A pass works once, from the same address, for 30 minutes. A recommendation with no token gives no pass.

Limits and details

• The limits of the web hold for a script: a limited number of bases in 24 hours from one address (Make a temporary base).
• The API can also be switched off for temporary bases: it then answers "The API does not make temporary bases now. Make one on the web."