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Caption Timing icon

Caption Timing

Caption/subtitle duration, character-per-line and reading-pace calculator, sourced from real style guides

Unify Dynamics LLC

Documentation
Tools8read-only
Sign-inNoneno account, no key
Data keptNoneprocessed in memory
PriceFreeoptional Pro limits
StatusLiveMCP + REST
Works withMCP · RESTany agent

Try asking

Real questions, and the tools your agent calls to answer them.

How long should this caption stay on screen?
Tools called
recommended_duration
Does this line fit Netflix's character limit?
Tools called
characters_per_line_check
Split this caption into two balanced lines
Tools called
split_into_lines
Is 3 seconds too fast for this caption?
Tools called
pacing_check
How many captions will a 500-word script need?
Tools called
estimate_script_caption_count
Convert 170 words per minute to characters per second
Tools called
convert_reading_speed
What's Netflix's character-per-line limit?
Tools called
caption_profile_reference
What does CPS mean?
Tools called
caption_glossary

About

Capshape is a fully local caption/subtitle timing & readability calculator. recommended_duration computes how long a caption should stay on screen from its character count and a reading-speed profile, clamped to that profile's min/max duration. characters_per_line_check checks each line of a caption against a profile's max characters-per-line and max-lines limits. split_into_lines word-wraps a longer caption into balanced lines under a character-per-line and max-lines limit. pacing_check takes a caption and its assigned duration and verdicts whether the pace is too fast, too slow, comfortably loose, or well-paced. estimate_script_caption_count estimates how many caption cards a full script will need and the total on-screen caption time. convert_reading_speed converts between words-per-minute and characters-per-second. caption_profile_reference gives full detail for a named profile (netflix_adult: 20 CPS/42 CPL; netflix_children: 17 CPS/42 CPL; bbc_general: ~17 CPS/37 CPL) sourced from Netflix's Partner Help Center and BBC subtitling guidance, or lists them all. caption_glossary defines CPS, CPL, lead-in/lead-out time, gap, shot-change sensitivity, SDH, closed vs burned-in captions, reading speed. Keyless; fully local; zero upstream calls; nothing stored.

Sources: Real computation (duration/CPS/line-wrap arithmetic) against reading-speed and layout profiles sourced from Netflix's Partner Help Center Timed Text Style Guide and BBC subtitling guidance, verified 2026-09-25; fully local, zero upstream calls

Privacy

The publisher, Unify Dynamics LLC, states that tool inputs are processed in memory and not retained.

Data not collectedNo account, no profile, no stored prompts or results.
Privacy policyTerms

What it can do

8 tools, grouped by job. Every one is read-only or compute-only.

OpenAPI
Timing3 tools
  • Recommended durationComputes how long a caption should stay on screen, from its character count and a reading-speed profile, clamped to that profile's min/max duration.
  • Pacing checkGiven a caption and its assigned duration, computes the actual reading pace and verdicts whether it's too fast, too slow, comfortably loose, or…
  • Estimate script caption countEstimates how many caption cards a full script/transcript will need and the total on-screen caption time.
Line Layout3 tools
  • Characters per line checkChecks each line of a caption against a profile's max characters-per-line and max-lines limits.
  • Split into linesWord-wraps a longer caption into balanced lines, each under a character-per-line limit, up to a max number of lines.
  • Convert reading speedConverts between words-per-minute and characters-per-second reading-speed units.
Reference2 tools
  • Caption profile referenceFull detail for a named reading-speed/layout profile (netflix_adult, netflix_children, bbc_general), or every profile if none given.
  • Caption glossaryDefinitions of core captioning terms: CPS, CPL, lead-in/lead-out time, gap, shot-change sensitivity, SDH, closed captions, burned-in captions,…

Information

PublisherUnify Dynamics LLC
CategoryDesign & creative · Everyday life
LanguagesEnglish
Built forWorldwide
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpointhttps://capshape.connectorbay.com/mcp
REST APIopenapi.json
SupportGet help · Status
CountryWorldwide

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Documentation

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What Capshape is for

"How long should this caption stay on screen?", "does this line fit Netflix's character limit?", "is 3 seconds too fast for this caption?" — real reading-speed math against the same profiles professional subtitlers actually work to, not a guess.

What it does

recommended_duration computes how long a caption should stay on screen from its character count and a reading-speed profile, clamped to that profile's minimum and maximum duration. characters_per_line_check checks each line of a caption against a profile's character-per-line and max-lines limits. split_into_lines word-wraps a longer caption into balanced lines that fit those limits. pacing_check takes a caption and the duration you've actually assigned it and verdicts whether it's too fast, too slow, comfortably loose, or well-paced. estimate_script_caption_count estimates how many caption cards a full script or transcript will need and the total on-screen caption time. convert_reading_speed converts between words-per-minute and characters-per-second. caption_profile_reference gives full detail for a named profile — netflix_adult (20 CPS, 42 characters per line), netflix_children (17 CPS), bbc_general (~17 CPS, 37 characters per line, converted from the BBC's published 160-180 words-per-minute guidance) — or lists them all. caption_glossary defines core terms: CPS, CPL, lead-in/lead-out time, gap, shot-change sensitivity, SDH, closed captions, burned-in captions, reading speed.

What it is not

Not a captioning tool itself — it computes timing and layout numbers, it doesn't generate or burn in captions. Profile numbers are sourced from Netflix's Partner Help Center Timed Text Style Guide and BBC subtitling guidance as published at the connector's build date; style guides are occasionally revised, so re-check the original source before treating a number here as a hard delivery requirement.

Privacy policy

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Capshape — Privacy Policy

Effective 25 September 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What Capshape is. Capshape is a connector (an MCP server and REST API) that AI assistants and personal agents call on your behalf for a fully local caption/subtitle timing and readability calculator, computing recommended duration, character-per-line checks, line-splitting and reading pace against profiles sourced from published subtitle style guides. You interact with your assistant; the assistant sends us only the arguments needed for that one lookup or calculation.

What we receive. The arguments of each tool call — caption text, a duration, a reading-speed profile name, or a conversion value — the technical headers needed to serve the request (an IP address or a client identifier supplied by the assistant, and a Pro API key if you have one), and standard server logs.

Everything is answered from bundled reference data and/or local computation, and nothing is stored. No request is forwarded to any third party — there is no upstream call at all, live or otherwise — and no query is logged in request bodies, recorded, or used to train anything.

What we do not receive or store. We do not receive your conversation with the assistant or your name, and we do not build a profile from your queries: each request is answered independently and nothing carries over between requests. Rate-limit counters (a client identifier and timestamps) are held in memory for at most 24 hours. Hosting-provider access logs, which contain IP addresses and request paths but not request bodies, are retained for up to 30 days for security and abuse prevention.

Sub-processors. None — the entire dataset is bundled with the server and answered locally. Hosting: Vercel (United States regions).

Legal bases and your rights. Our processing is necessary to provide the service you request through your assistant. Because we store no personal data beyond short-lived logs, requests to access, correct or delete personal data are usually satisfied automatically; you can still contact agent@connectorbay.com and we will respond within 30 days. We do not sell or share personal information and do not use your data to train models.

Children. Capshape is a general-audience service operated by the adult using the assistant.

Changes. We will post changes here with a new effective date.

Terms of service

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Capshape — Terms of Service

Effective 25 September 2026. These terms govern use of the Capshape connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

  1. The Service. Capshape returns real reading-speed and line-layout calculations for captions and subtitles, using profiles sourced from published subtitle style guides (Netflix Partner Help Center, BBC subtitling guidance). It is accessed through an AI assistant or directly over MCP or HTTP.
  2. Reference profiles, not a delivery guarantee. Capshape’s profile numbers are sourced from published, official subtitle style guides as of the connector’s build date. Style guides are occasionally revised — always confirm against the current source before treating a number here as a hard delivery requirement.
  3. Reference, not real-time guidance. Content reflects general, widely published practice as of the build date stated in the Service's own data or responses. It does not know your specific situation, equipment, or context, and it cannot replace judgment formed through experience or professional consultation where relevant.
  4. Acceptable use. Automated use within the published rate limits is welcome.
  5. Availability. The Service is provided "as is" without warranty. We may change, limit or discontinue it at any time.
  6. Data. Our Privacy Policy describes what we process. In short: your request is answered from bundled reference data and/or local computation, and nothing is stored.
  7. Pro keys. Optional Pro API keys are issued at our discretion, are personal to the holder and may be revoked for abuse.
  8. Liability. To the fullest extent permitted by law, Unify Dynamics LLC is not liable for any loss, injury, or damage arising from use of, or reliance on, the Service. Our total liability is limited to US $100.
  9. Governing law. California law; venue in San Mateo County, California.
  10. Contact. Unify Dynamics LLC · agent@connectorbay.com · https://connectorbay.com/capshape

Support

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Caption Timing support

Email agent@connectorbay.com. We answer within two business days.

When you report a problem, include the question you asked your agent, roughly when, and which agent you used (for example Claude, ChatGPT or Gemini). Never send us passwords, account numbers or ID numbers. Caption Timing never asks for them.

Get Caption Timing

Free · No sign-in · Read-only

Streamable HTTP, stateless, no authentication. Paste the endpoint into any MCP-capable agent.

https://capshape.connectorbay.com/mcp
{
  "mcpServers": {
    "capshape": {
      "type": "http",
      "url": "https://capshape.connectorbay.com/mcp"
    }
  }
}