# Apps

Deploy static sites, bundles, Dockerfiles, and OCI images to stable SingulaComp URLs.

Canonical page: https://singulacomp.ai/docs/feature-flags/apps

A SingulaComp App is a provider-neutral serverless deployment owned by one project.
An App owns one stable URL. Each deployment is immutable and numbered. A failed
deployment never replaces live traffic.

Apps is a [feature flag](/docs/feature-flags). Its stability is **stable**, and
it is off by default. Turn it on per project before you deploy.

Building on Apps from TypeScript? See [SDK → Apps](/docs/sdk/apps) for the
client surface and the React hooks.

## Turn Apps on

Open **Settings → Experimental** and switch **Apps** on for the project. You
need `project.customize.write`.

While the flag is off:

- Every Apps route answers `403` with
  `{ error, code: "feature_disabled", feature: "apps" }`.
- `singulacomp apps <subcommand>` prints the same sentence and exits `1`.
- The **Apps** entry does not appear in the project sidebar. Opening
  `/projects/<id>/apps` directly shows a gate screen that links to the flag. The
  page itself never enables the feature.

## Source kinds

All four source kinds run on the same SingulaComp sandbox hosting backend. SingulaComp
selects Daytona, Platinum, or E2B. They therefore share one deployment contract
and one cold-wake contract.

| Kind | Deploy this | SingulaComp does |
|---|---|---|
| `static` | Plain HTML, CSS, JS, or a prebuilt SPA or `dist/` | Serves the files |
| `bundle` | A package source | Runs the install and build commands, then serves the output directory |
| `dockerfile` | A repository with a Dockerfile | Builds the image, then runs your `command` on your `port` |
| `oci_image` | A public image reference | Runs your `command` on your `port` |

Pick the fastest path for the result you want:

- Build Vite locally and deploy `dist/` as `static` for the lowest latency.
- Deploy the package source as `bundle` when SingulaComp must run the install and
  build.
- Export Next.js with `output: 'export'` and deploy `out/` as `static` when the
  App needs no server runtime.
- Deploy server-rendered Next.js and arbitrary services as `dockerfile`, with
  an explicit command and port.
- Deploy an existing public image as `oci_image`, with an explicit command and
  port.

`dockerfile` and `oci_image` require `--command` and `--port`. `static` and
`bundle` do not.

## Deploy from the CLI

```bash
singulacomp apps deploy .
```

`deploy` creates the App on first use, registers an immutable artifact —
uploading a `.tar.gz` for a path, or recording the reference for `--image` —
builds it, and blocks until the stable URL is ready. The wait budget is `--wait-seconds`,
default `1200`. Use `--no-wait` only when another process owns status tracking.

```bash
singulacomp apps deploy dist --slug docs --access project
singulacomp apps deploy . --type dockerfile --command '["node","server.js"]' --port 3000
singulacomp apps deploy --image ghcr.io/acme/service:2026-08-07 --command '["node","server.js"]' --port 3000
```

The full subcommand list:

| Command | What it does |
|---|---|
| `singulacomp apps list` | List the project's Apps. `--json`. |
| `singulacomp apps create <slug>` | Create an App without deploying it. |
| `singulacomp apps deploy [path]` | Deploy a directory, a `.tar.gz`, or `--image`. |
| `singulacomp apps set <id\|slug>` | Change an existing App: `--name`, `--cpu`, `--memory-gb`, `--disk-gb`, `--idle-timeout`, `--budget`. |
| `singulacomp apps show <id\|slug>` | Show the App and its deployments. `--json`. |
| `singulacomp apps logs <id\|slug> [deployment]` | Read runtime logs. `--after N --limit N`. |
| `singulacomp apps start <id\|slug>` | Permit requests and start the App. |
| `singulacomp apps stop <id\|slug>` | Suspend compute now. |
| `singulacomp apps rollback <id\|slug> <deployment>` | Move traffic to a ready deployment. |
| `singulacomp apps access <id\|slug>` | Read or update the access policy. |
| `singulacomp apps access-link <id\|slug>` | Create a short-lived authenticated browser URL. |
| `singulacomp apps delete <id\|slug>` | Delete the App and its runtimes. `--yes`. |

`--project`, `--host`, and `--json` work on every subcommand.

`singulacomp apps set` sends only the flags you pass, and needs project write
access. `--memory-gb` accepts `--memory` and `--disk-gb` accepts `--disk` as
aliases. `--idle-timeout` takes 120-86400 seconds. A machine or budget change
applies to the next deployment, not to the running runtime.

### Deployment defaults from `singulacomp.yaml`

An `apps.<name>` block holds local deploy defaults. The server stays the App
control plane: the block never carries access, passwords, or member ids.

```yaml
apps:
  docs:
    path: docs/dist
    type: static
    spa: true
    readiness_path: /
    idle_timeout_seconds: 300
    monthly_budget_usd: 5
    resources:
      cpu: 1
      memory_gb: 2
      disk_gb: 10
    env:
      PUBLIC_BASE: https://singulacomp.ai
    secrets:
      API_TOKEN: docs_api_token
```

Select the block with `singulacomp apps deploy --manifest-app docs`. An explicit flag
always wins over the block.

### Machine, idle timeout, and budget

| Setting | Default | Bounds |
|---|---|---|
| `cpu` | `1` | `1` to `32` cores |
| `memory_gb` | `2` | `1` to `128` GiB |
| `disk_gb` | `10` | `1` to `500` GiB |
| `idle_timeout_seconds` | `300` | `120` to `86400` |
| `monthly_budget_usd` | `5` | `0` to `100000`, or the operator's `SINGULACOMP_APPS_MAX_MONTHLY_BUDGET_USD` |

Apps reject a machine larger than the limits instead of clamping it. An App
records its requested spec and bills off that record, so a silent downgrade
would charge for compute the provider never gave. An out-of-range value answers
`400` with `code: "app_machine_out_of_range"` or `"app_budget_out_of_range"`.

Creating an App past the account's App quota answers `402` with
`code: "app_quota_exceeded"`. A duplicate slug in the same project answers
`409`.

## The stable URL

SingulaComp assigns the hostname when the App is created and never changes it. On
SingulaComp cloud it is `<env>-<slug>-<route-key>.apps.singulacomp.ai`. Self-hosted
deployments serve their own wildcard domain from `SINGULACOMP_APPS_BASE_DOMAIN`.

An authorized request to a suspended App resumes its sandbox, waits for
readiness, and proxies that same request. You do not have to wake it first.

While the App is waiting for its first deployment, queued, validating,
building, provisioning, checking, activating, or starting:

- A browser navigation gets a branded status page, HTTP `202`, `retry-after: 3`,
  and a 3-second meta refresh.
- A machine client gets `202` and JSON — for a cold start,
  `{ code: "app_starting" }` with `retry-after: 3`.

Terminal and paused states answer differently:

| State | HTTP | `code` |
|---|---|---|
| Deployment failed | `503` | `app_deployment_failed` |
| Deployment cancelled | `503` | `app_deployment_cancelled` |
| Monthly compute budget reached | `402` | `app_budget_exceeded` |
| Account cannot start compute | `402` | `app_account_unfunded` |
| Account at its concurrent-App limit | `429` | `app_concurrency_limit` |

`singulacomp apps stop` suspends compute immediately; the next authorized request
resumes the App. `singulacomp apps start` warms it before traffic arrives.

> **Cold starts stay invisible**
> The stable URL never exposes an `app_stopped` state. A provider edge that
> answers `502` during the first request after a resume is served as the ordinary
> cold-start page instead. A warm App owns its own HTTP status, including a
> deliberate application `502`.

## Access modes

An App's access mode is a per-resource visibility setting on top of the role
model, not a role. It decides who can open this one App. It grants no permission
the role verdict denies. See
[Accounts & access](/docs/accounts#per-feature-access-settings).

New Apps are private. Choose one mode:

| Mode | Who can open the App |
|---|---|
| `private` | The creator only |
| `project` | Every principal who can read the project |
| `restricted` | Selected users and groups |
| `public` | Anyone, with no authentication |
| `password` | Anyone with the App password |

Set it at deploy time or afterwards:

```bash
singulacomp apps deploy . --access restricted --members m1,m2 --groups g1
singulacomp apps access docs --mode password --password 's3cret'
singulacomp apps access-link docs --json
```

SingulaComp access uses a five-minute exchange URL and an eight-hour, host-only,
secure cookie. `access-link` mints that exchange URL without changing the
policy — treat it as a secret.

Changing an access policy increments its revision, which revokes every existing
App cookie. Passwords are Argon2id hashes; the API, the CLI, and the SDK never
return a password or its hash.

> **Never put an App password in your repo**
> `singulacomp.yaml` holds deployment defaults only. Pass a password with `--password`,
> or set it from the access modal.

Being able to see an App listed and being able to open it are different
verdicts. A project manager sees every App in the project, so a private App
stays manageable when its creator leaves. An account owner and an account admin
hold manager-equivalent access on every project, so the same applies to them.
The App record reports `viewer_can_access` for the second question.

## Versions and rollback

Each deployment gets the next version number for its App and is immutable. The
deployment record keeps its source kind, hosting provider, build and runtime
spec, attempt count, and error code.

Every deployment also records who made it: `created_by`, `actor_type`
(`human`, `agent`, `service_account`, or `system`), and the originating
`source_session_id` when an agent deployed it.

Move traffic back to any ready deployment:

```bash
singulacomp apps rollback docs <deployment-id>
```

Rollback starts the target deployment's runtime first, then stops the previous
one. A target that fails to start leaves the current deployment serving.

Each cold start compares the active deployment's runtime version against the
current SingulaComp App runtime. The old deployment keeps serving while SingulaComp
asynchronously builds one immutable replacement with the latest `singulacomp-appd`
and Caddy binaries. A PostgreSQL advisory lock prevents duplicate refreshes.

## The Apps page

Once the flag is on, an **Apps** row appears in the project sidebar, under
Customize. The page is operational, not a creation surface: it lists the
project's Apps with live state, a signed preview of each running App, and the
access controls. Deploying is `singulacomp apps deploy .`.

An App with no active deployment reads **Not deployed**, never **Running**. A
suspended App's preview issues the request that wakes it.

SingulaComp opens `*.apps.singulacomp.ai` and `*.apps.localhost` on their direct origin
rather than through a session's web forward proxy. That preserves the host-only
access cookie and removes one network hop.