Create app

curl --request POST \
  --url https://app.base44.com/api/apps \
  --header 'Content-Type: application/json' \
  --header 'api_key: <api-key>' \
  --data '
{
  "initial_message": {
    "content": "A CRM to track leads and deals"
  }
}
'

import requests

url = "https://app.base44.com/api/apps"

payload = { "initial_message": { "content": "A CRM to track leads and deals" } }
headers = {
    "api_key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {api_key: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({initial_message: {content: 'A CRM to track leads and deals'}})
};

fetch('https://app.base44.com/api/apps', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://app.base44.com/api/apps",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'initial_message' => [
        'content' => 'A CRM to track leads and deals'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "api_key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://app.base44.com/api/apps"

	payload := strings.NewReader("{\n  \"initial_message\": {\n    \"content\": \"A CRM to track leads and deals\"\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("api_key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://app.base44.com/api/apps")
  .header("api_key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"initial_message\": {\n    \"content\": \"A CRM to track leads and deals\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.base44.com/api/apps")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["api_key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"initial_message\": {\n    \"content\": \"A CRM to track leads and deals\"\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "id": "6820f3a4e7b91d003c45a1f2",
  "first_prompt_model_comparison": {
    "id": "<string>",
    "client_creation_id": "<string>",
    "models": [
      "<string>"
    ],
    "status": "preparing"
  },
  "name": "My CRM",
  "slug": "my-crm-3c45a1f2",
  "user_description": "A CRM to track leads and deals",
  "created_by": "developer@example.com",
  "created_date": "2026-08-01T09:15:00",
  "updated_date": "2026-08-02T14:30:00",
  "status": {
    "state": "ready",
    "details": "Publishing app",
    "request_id": "a1b2c3d4e5f67890abcdef12",
    "last_updated_date": "2026-08-02T14:30:00Z",
    "error_source": "build",
    "paywall_context": {
      "billing_organization_id": "67e0b12c4d8a3f005b21c9e4",
      "user_id": "6706af53b9c1e2004a37d85f",
      "evaluated_at": "2026-08-02T14:30:00Z"
    }
  },
  "last_deployed_at": "2026-08-02T14:30:00",
  "screenshot_url": "https://storage.base44.com/screenshots/6820f3a4e7b91d003c45a1f2.png",
  "preview_screenshot_url": "https://storage.base44.com/previews/6820f3a4e7b91d003c45a1f2.png"
}

Apps

Create app

This API is in beta. Endpoints, fields, and behavior may still change, so avoid depending on it in production.

Creates a new app. Pass initial_message.content to build it from a prompt, or send an empty body ({}) to create an empty app. Add initial_message.file_urls to build from a screenshot or a mockup alongside the prompt.

Building from a prompt runs in the background and consumes credits. Poll Get app and watch its status to see when the build finishes. By default the app is created in your default workspace. Set organization_id to create it in another workspace you belong to. This endpoint is limited to 5 requests per minute.

The response includes fields beyond the ones documented here. Don’t rely on undocumented response fields, as they can change at any time. Send only the fields documented here. Other request fields are not supported and their behavior can change.

POST

api

apps

Create app

curl --request POST \
  --url https://app.base44.com/api/apps \
  --header 'Content-Type: application/json' \
  --header 'api_key: <api-key>' \
  --data '
{
  "initial_message": {
    "content": "A CRM to track leads and deals"
  }
}
'

import requests

url = "https://app.base44.com/api/apps"

payload = { "initial_message": { "content": "A CRM to track leads and deals" } }
headers = {
    "api_key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {api_key: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({initial_message: {content: 'A CRM to track leads and deals'}})
};

fetch('https://app.base44.com/api/apps', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://app.base44.com/api/apps",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'initial_message' => [
        'content' => 'A CRM to track leads and deals'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "api_key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://app.base44.com/api/apps"

	payload := strings.NewReader("{\n  \"initial_message\": {\n    \"content\": \"A CRM to track leads and deals\"\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("api_key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://app.base44.com/api/apps")
  .header("api_key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"initial_message\": {\n    \"content\": \"A CRM to track leads and deals\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.base44.com/api/apps")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["api_key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"initial_message\": {\n    \"content\": \"A CRM to track leads and deals\"\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "id": "6820f3a4e7b91d003c45a1f2",
  "first_prompt_model_comparison": {
    "id": "<string>",
    "client_creation_id": "<string>",
    "models": [
      "<string>"
    ],
    "status": "preparing"
  },
  "name": "My CRM",
  "slug": "my-crm-3c45a1f2",
  "user_description": "A CRM to track leads and deals",
  "created_by": "developer@example.com",
  "created_date": "2026-08-01T09:15:00",
  "updated_date": "2026-08-02T14:30:00",
  "status": {
    "state": "ready",
    "details": "Publishing app",
    "request_id": "a1b2c3d4e5f67890abcdef12",
    "last_updated_date": "2026-08-02T14:30:00Z",
    "error_source": "build",
    "paywall_context": {
      "billing_organization_id": "67e0b12c4d8a3f005b21c9e4",
      "user_id": "6706af53b9c1e2004a37d85f",
      "evaluated_at": "2026-08-02T14:30:00Z"
    }
  },
  "last_deployed_at": "2026-08-02T14:30:00",
  "screenshot_url": "https://storage.base44.com/screenshots/6820f3a4e7b91d003c45a1f2.png",
  "preview_screenshot_url": "https://storage.base44.com/previews/6820f3a4e7b91d003c45a1f2.png"
}

Authorizations

api_key

string

header

required

Personal API key.

Body

application/json

initial_message

object

First prompt to build the app from. Omit to create an empty app.

Show child attributes

first_prompt_model_comparison

object

Build the first prompt with two eligible models and choose one version.

Show child attributes

organization_id

string

ID of the workspace to create the app in. Omit to use your default workspace. You must have an editor-capable role (Editor or above) in the workspace. Viewers and guests cannot create apps. This is the same workspace ID that List apps accepts as workspace_id.

Example:

"67e0b12c4d8a3f005b21c9e4"

Response

Successful Response

An app in a workspace, limited to the properties the caller requested.

string | null

ID of the app.

Example:

"6820f3a4e7b91d003c45a1f2"

first_prompt_model_comparison

FirstPromptModelComparisonState · object | null

Accepted first-prompt model comparison, including its durable comparison ID.

Show child attributes

name

string | null

Display name of the app.

Example:

"My CRM"

slug

string | null

URL slug for the app, auto generated from the name and app ID or set to a custom value, or null if the app has no slug yet. The published URL is built from it.

Example:

"my-crm-3c45a1f2"

user_description

string | null

Description of the app, or null if none was set. On a newly created app this holds the original prompt text.

Example:

"A CRM to track leads and deals"

created_by

string | null

Email of the user who created the app.

Example:

"developer@example.com"

created_date

string<date-time> | null

Time the app was created, as a UTC timestamp in ISO 8601 format.

Example:

"2026-08-01T09:15:00"

updated_date

string<date-time> | null

Time the app document was last written, as a UTC timestamp in ISO 8601 format.

Example:

"2026-08-02T14:30:00"

status

AppStatusResponse · object | null

The app's current build status. Poll while a build is in progress to watch it finish. This tracks building, not publishing.

Show child attributes

last_deployed_at

string<date-time> | null

Time the app was last published, as a UTC timestamp in ISO 8601 format, or null if it has never been published.

Example:

"2026-08-02T14:30:00"

screenshot_url

string | null

URL of a screenshot of the published app. Captured shortly after each publish, so it can briefly lag or be null right after publishing.

Example:

"https://storage.base44.com/screenshots/6820f3a4e7b91d003c45a1f2.png"

preview_screenshot_url

string | null

URL of a preview screenshot taken before publishing, distinct from screenshot_url, or null if none has been captured.

Example:

"https://storage.base44.com/previews/6820f3a4e7b91d003c45a1f2.png"

Base44 APIs

Apps API (Beta)

Monitoring API

Audit Logs API

Create app

Authorizations

Body

Response