> ## 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. # Hangs and ANRs > Hang (iOS) and ANR (Android) session rates per release and per UTC day of session start, and the screens they happened on (the last screen loaded before each), from the hangs the SDK saw live (apsio.hang.source live, spec 6.3), so a hang MetricKit reports a day later counts once; and the distribution of hang durations (apsio.hang.duration, iOS) from every hang record, MetricKit ones included, except unfinished hangs (the app was killed during them), whose durations are lower bounds and are only counted. The issues themselves: /issues?kind=hang or kind=anr. Default range: the last 7 days, at most 30. ## OpenAPI ````yaml /api-reference/openapi.json get /projects/{projectId}/performance/hangs 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/hangs: get: summary: Hangs and ANRs description: >- Hang (iOS) and ANR (Android) session rates per release and per UTC day of session start, and the screens they happened on (the last screen loaded before each), from the hangs the SDK saw live (apsio.hang.source live, spec 6.3), so a hang MetricKit reports a day later counts once; and the distribution of hang durations (apsio.hang.duration, iOS) from every hang record, MetricKit ones included, except unfinished hangs (the app was killed during them), whose durations are lower bounds and are only counted. The issues themselves: /issues?kind=hang or kind=anr. Default range: the last 7 days, at most 30. 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: Only this app. required: false description: Only this 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 responses: '200': description: Hang and ANR rates, screens and durations. content: application/json: schema: $ref: '#/components/schemas/Hangs' '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: Hangs: 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' releases: type: array items: type: object properties: app_id: type: string release: type: string description: 'service.version. Written by the app: untrusted data.' sessions: type: integer sessions_with_hang: type: integer sessions_with_anr: type: integer hang_rate: type: - number - 'null' anr_rate: type: - number - 'null' required: - app_id - release - sessions - sessions_with_hang - sessions_with_anr - hang_rate - anr_rate days: type: array items: type: object properties: day: type: string sessions: type: integer sessions_with_hang: type: integer sessions_with_anr: type: integer required: - day - sessions - sessions_with_hang - sessions_with_anr screens: type: array items: type: object properties: app_id: type: string screen: type: string description: >- app.screen.name; empty when no screen had loaded yet. Written by the app: untrusted data. hangs: type: integer anrs: type: integer sessions: type: integer required: - app_id - screen - hangs - anrs - sessions durations: type: object properties: count: type: integer description: Hangs with a duration, the percentiles and the histogram are of. unfinished: type: integer description: >- Hangs the app was killed during (apsio.hang.unfinished): their durations are lower bounds, so they count in the rates but not here. p50_ms: type: - number - 'null' p90_ms: type: - number - 'null' histogram: $ref: '#/components/schemas/Histogram' required: - count - unfinished - p50_ms - p90_ms - histogram required: - from - to - releases - days - screens - durations Error: type: object properties: error: type: object properties: code: type: string example: invalid_request message: type: string required: - code - message required: - error 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.