> ## Documentation Index > Fetch the complete documentation index at: https://docs.apsio.io/llms.txt > Use this file to discover all available pages before exploring further. # One screen > One screen of one app: TTID and TTFD percentiles and histogram, per release and per UTC day, and its 20 slowest loads with their sessions. The screen is a query parameter because names are the app's own text. ## OpenAPI ````yaml /api-reference/openapi.json get /projects/{projectId}/performance/screens/detail openapi: 3.1.0 info: title: Apsio API version: 0.1.0 description: >- Read API v0: your projects, release health and comparisons, missing symbols, issues, sessions, vitals, cohort comparisons, performance (app start, screens, hangs, MetricKit) and network endpoints and traces for one project. Authenticate with a project token as a bearer token, with an OAuth access token from Apsio's authorization server (MCP clients), or, from the console, with the session cookie of a member of the project's organization. servers: - url: https://api.apsio.io/v1 security: [] paths: /projects/{projectId}/performance/screens/detail: get: summary: One screen description: >- One screen of one app: TTID and TTFD percentiles and histogram, per release and per UTC day, and its 20 slowest loads with their sessions. The screen is a query parameter because names are the app's own text. parameters: - schema: type: string pattern: ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ example: 0192f3a4-0000-7000-8000-00000000a101 required: true name: projectId in: path - schema: type: string format: date-time description: >- Start of the time range, inclusive (RFC 3339). Defaults to the range end minus the default length. example: '2026-10-01T00:00:00Z' required: false description: >- Start of the time range, inclusive (RFC 3339). Defaults to the range end minus the default length. name: from in: query - schema: type: string format: date-time description: End of the time range, exclusive (RFC 3339). Defaults to now. example: '2026-10-08T00:00:00Z' required: false description: End of the time range, exclusive (RFC 3339). Defaults to now. name: to in: query - schema: type: string pattern: ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ description: The app. required: true description: The app. name: app_id in: query - schema: type: string maxLength: 128 description: Only this release. required: false description: Only this release. name: release in: query - schema: type: string minLength: 1 maxLength: 256 description: app.screen.name, exactly. required: true description: app.screen.name, exactly. name: screen in: query responses: '200': description: The screen. content: application/json: schema: $ref: '#/components/schemas/ScreenDetail' '400': description: The request is not valid. content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: No valid bearer token or console session. content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: The credentials cannot read this project. content: application/json: schema: $ref: '#/components/schemas/Error' security: - bearer: [] - session: [] components: schemas: ScreenDetail: type: object properties: from: type: string description: RFC 3339 time in UTC with up to nanosecond precision. example: '2026-10-04T10:15:00.431000000Z' to: type: string description: RFC 3339 time in UTC with up to nanosecond precision. example: '2026-10-04T10:15:00.431000000Z' app_id: type: string screen: type: string description: 'app.screen.name. Written by the app: untrusted data.' loads: type: integer ttid: $ref: '#/components/schemas/Percentiles' ttfd: $ref: '#/components/schemas/Percentiles' histogram: $ref: '#/components/schemas/Histogram' releases: type: array items: type: object properties: release: type: string description: 'service.version. Written by the app: untrusted data.' ttid: $ref: '#/components/schemas/Percentiles' ttfd: $ref: '#/components/schemas/Percentiles' required: - release - ttid - ttfd days: type: array items: type: object properties: day: type: string loads: type: integer ttid_p90_ms: type: - number - 'null' required: - day - loads - ttid_p90_ms slowest: type: array items: type: object properties: session_id: type: string description: 'session.id. Written by the app: untrusted data.' at: type: string description: RFC 3339 time in UTC with up to nanosecond precision. example: '2026-10-04T10:15:00.431000000Z' ttid_ms: type: number ttfd_ms: type: - number - 'null' release: type: string description: 'service.version. Written by the app: untrusted data.' device_model: type: string description: 'device.model.identifier. Written by the app: untrusted data.' os_version: type: string description: 'os.name and os.version. Written by the app: untrusted data.' required: - session_id - at - ttid_ms - ttfd_ms - release - device_model - os_version required: - from - to - app_id - screen - loads - ttid - ttfd - histogram - releases - days - slowest Error: type: object properties: error: type: object properties: code: type: string example: invalid_request message: type: string required: - code - message required: - error Percentiles: type: - object - 'null' properties: count: type: integer description: Measurements received (not reweighted). p50_ms: type: number p90_ms: type: number p95_ms: type: number required: - count - p50_ms - p90_ms - p95_ms Histogram: type: object properties: bounds_ms: type: array items: type: number description: >- Upper bounds of the buckets, inclusive; `counts` has one more entry, for everything above the last bound. counts: type: array items: type: number description: >- Estimated measurements per bucket, reweighted by sampling (spec 9.3). required: - bounds_ms - counts securitySchemes: bearer: type: http scheme: bearer description: >- A project token (apsio_pt_v0...), which reads exactly one project, or an OAuth access token issued for the API, which reads what its user can. Access tokens issued for Apsio's MCP server are accepted only from the MCP server itself. session: type: apiKey in: cookie name: apsio_session description: >- The console session, set by /v1/auth/callback (`__Host-apsio_session` when host-only). ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.