ToolAssay

Takes subtitle text in SRT or WebVTT and checks every cue against configurable r

Takes subtitle text in SRT or WebVTT and checks every cue against configurable rules: maximum characters per line (default 42), maximum lines per cue (2), reading speed in characters per second (default 17 for adults, 13 recommended for children), minimum duration (0.83 s) and maximum duration (7 s), overlapping cues, and gaps too short for the eye to register a change (under 2 frames). Defaults follow common streaming and broadcaster guidelines.

Not tested: has real-world effectsour last check, 2026-10-31
0 of 0checks answered this week
n/amedian answer time
$0.002listed price per call
n/aprice it asked us

Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.

Endpoint

POST https://medien.halowerk.com/v1/captions-check

CategoryEverything else
Provider hostmedien.halowerk.com
Networkseip155:8453
Payment schemesexact
Self-reported calls, 30 days1 from 1 payers (the provider's figure, not ours)

Our checks, last 30 days

We never call tools that send, buy, move money or file anything, not even without paying.

Example input (from the provider)

{
  "body": {
    "max_cps": 17,
    "subtitles": "1\n00:00:05,520 --> 00:00:08,960\nYep. I said it before, and I'll say it again.\n\n2\n00:00:10,071 --> 00:00:15,511\nLife moves pretty fast. You don't stop and look around once in a while, you could miss it.\n"
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
}

Promised output schema (from the provider)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "additionalProperties": false,
          "properties": {
            "max_chars_per_line": {
              "default": 42,
              "maximum": 80,
              "minimum": 20,
              "type": "integer"
            },
            "max_cps": {
              "default": 17,
              "maximum": 30,
              "minimum": 8,
              "type": "number"
            },
            "max_duration": {
              "default": 7,
              "maximum": 15,
              "minimum": 3,
              "type": "number"
            },
            "max_lines": {
              "default": 2,
              "maximum": 4,
              "minimum": 1,
              "type": "integer"
            },
            "min_duration": {
              "default": 0.83,
              "maximum": 3,
              "minimum": 0.3,
              "type": "number"
            },
            "min_gap": {
              "default": 0.083,
              "maximum": 0.5,
              "minimum": 0,
              "type": "number"
            },
            "subtitles": {
              "maxLength": 2000000,
              "minLength": 10,
              "type": "string"
            }
          },
          "required": [
            "subtitles"
          ],
          "type": "object"
        },
        "bodyType": {
          "enum": [
            "json",
            "form-data",
            "text"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "POST",
            "PUT",
            "PATCH"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}

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