Skip to content
Good for Bots

Chrome extension to control YouTube captions and detect burned-in subtitles

Click badge to copy

Changed your site? Run a new scan.

Claim to rescan

Claiming is free. Verify ownership to request a rescan after deploying your changes.

Unclaimed listings are checked automatically every 90 days.

Good for Bots report

subtitle.im scores 68 of 100: 40 of the 50 base points, 28 of the 50 agent-layer points, no penalties.

Earned

40 of the 50 base points above the line, 28 of the 50 agent-layer points below it.

68

3 prompts away

Copy them below ↓

23

Still open

Behind the checks below, with prompts in Pro.

9
Penalties0
How scoring works · current methodology →

Through a bot’s eyes

“subtitle.im is a Chrome extension that automatically controls YouTube captions and detects local burned-in subtitles.”

Simulated from the response GoodForBotsBot received on , not a live answer from any AI assistant.

What it can read, and what stays hidden →

What a bot can read

The input provides detailed homepage text and an llms.txt file covering the product features, installation context, privacy practices, and pricing plans. A language model reading the text learns how the extension detects burned-in subtitles locally without uploading video frames, how caption controls operate at global, channel, and video levels, and how different language conflicts are resolved. The homepage explicitly details pricing, offering a free tier with ten successfully handled videos, a Pro annual subscription priced at seventeen dollars and ninety-nine cents per year, and a Pro Lifetime option priced at twenty-nine dollars and ninety-nine cents. It also outlines clear documentation references through the llms.txt file, detailing links to setup guides, FAQs, privacy policies, terms of service, and translated versions. Visitor questions regarding allowances, refunds, and manual overrides are comprehensively answered in the text.

What is subtitle.im?

im is a Chrome browser extension designed for desktop YouTube users who want to control video captions automatically. The extension detects burned-in subtitles locally using optical character recognition and manages switchable YouTube captions based on user preferences.

Read more →

It offers global settings alongside channel and video rules to automatically open, close, or follow YouTube captions, and provides handling options when burned-in subtitles and switchable captions appear in different languages. The tool is available with a free tier covering a limited number of successful video handling instances, as well as paid annual and lifetime Pro subscriptions.

3 prompts, 23 points

For Claude Code, Cursor or Codex. The score moves after the next scan.

+10score from 68 to 78

Serve Markdown when asked for it

None of the 4 pages read pass. Asking the homepage for markdown still returns text/html.

Read prompt

+8.3score from 78 to 86

Describe the site with schema.org JSON-LD

1 of 4 pages read pass. The homepage publishes no structured data at all: no JSON-LD, no microdata, no RDFa.

Read prompt

+5score from 86 to 91

State a position on AI crawlers

robots.txt names no AI crawlers, so every operator has to guess.

Read prompt

Pro

15 more prompts in Pro

Pro shows a prompt for every fix and drafts your llms.txt and robots.txt. It never changes the score.

$9 once, per listingSee Pro

Deployed your fixes? Rescan to update your score →

Ready-made files

Pro drafts these for this site.

Pro

A ready-made llms.txt and robots.txt

Pro drafts both files for subtitle.im from its scan, keeps only links and rules our parsers can verify, and hands them over ready to review and publish. It never changes the score.

See Pro

Select a check to see what we found and how it is graded.

Readable base

40.4 / 50

Passes.

3.3 of 3.3 points.

robots.txt is valid, with 1 user-agent group.

Passes.

8.3 of 8.3 points.

Sitemap declared in robots.txt, listing 72 URLs.

Fails.

0 of 8.3 points.

1 of 4 pages read pass. The homepage publishes no structured data at all: no JSON-LD, no microdata, no RDFa.

Passes.

10 of 10 points.

All 4 pages read pass. The homepage marks its content root, its heading outline and its landmarks.

Passes.

8.3 of 8.3 points.

5 of 5 assessed homepage navigation links expose usable destinations.

Passes.

4.2 of 4.2 points.

190 of 190 assessed homepage links and buttons have a nonempty accessible name.

Passes.

2.5 of 2.5 points.

1 of 1 assessed homepage form fields meet the static naming and field-semantics checks.

Half passes.

1.3 of 2.5 points.

199 of 200 assessed homepage controls and role declarations meet the static role, state and relationship checks.

Prompt in Pro →
Passes.

1.7 of 1.7 points.

All 4 pages read pass. The homepage declares itself as its canonical URL.

Agent layer

27.5 / 50

Passes.

11.3 of 11.3 points.

/llms.txt is well formed: 13 links across 2 sections.

Half passes.

3.8 of 7.5 points.

/llms.txt is partly descriptive: only 38% of links carry a description.

Prompt in Pro →
Passes.

12.5 of 12.5 points.

llms.txt points at 5 markdown versions of pages.

Fails.

0 of 10 points.

None of the 4 pages read pass. Asking the homepage for markdown still returns text/html.

Fails.

0 of 5 points.

robots.txt names no AI crawlers, so every operator has to guess.

Fails.

0 of 2.5 points.

No usage declaration found in robots.txt or the final successful homepage response header.

Prompt in Pro →

Penalties

− 0

Passes.

Penalty: 0 of 15 points.

Our crawler reaches the page without being challenged.

Passes.

Penalty: 0 of 20 points.

Nothing on the homepage tells a crawler to skip it or to withhold its snippet.

Passes.

Penalty: 0 of 25 points.

The captured homepage HTML contains 1171 content words; completeness is not assessed.

Passes.

Penalty: 0 of 25 points.

robots.txt allows every known search and user-fetch crawler to reach the homepage.

Passes.

Penalty: 0 of 10 points.

The homepage is served over HTTPS and returns HTTP 200.

Passes.

Penalty: 0 of 3 points.

The homepage provides both a non-empty title and meta description.

Passes.

Penalty: 0 of 3 points.

The homepage is reached in 0 redirects.

Passes.

Penalty: 0 of 3 points.

The homepage reached a plain crawler in 111 ms.

Agent capabilities

0 of 11 · no points

Each one found adds +1 to the badge.

Not applicable.

Adds +1 to the badge when found.

No API catalog published.

Not applicable.

Adds +1 to the badge when found.

No /auth.md published.

Not applicable.

Adds +1 to the badge when found.

No AI Catalog published, so no MCP server card can be discovered.

Not applicable.

Adds +1 to the badge when found.

No A2A Agent Card at /.well-known/agent-card.json, and none listed in an AI Catalog.

Not applicable.

Adds +1 to the badge when found.

No usable Agent Skills index was found at either well-known path or in the AI Catalog.

Not applicable.

Adds +1 to the badge when found.

No WebMCP declarations were found in the collected HTML or inline scripts. External scripts were not inspected.

Not applicable.

Adds +1 to the badge when found.

No Web Bot Auth key directory at /.well-known/http-message-signatures-directory.

Not applicable.

Adds +1 to the badge when found.

No HTTP 402 payment challenge on the homepage or robots.txt, and no manifest at /.well-known/x402.

Not applicable.

Adds +1 to the badge when found.

No ACP discovery declaration established at /.well-known/acp.json.

Not applicable.

Adds +1 to the badge when found.

No UCP discovery declaration established at /.well-known/ucp.

Not applicable.

Adds +1 to the badge when found.

No public AMP discovery declaration established. Private or hidden agents may not advertise one to our crawler.

Access & usage policy

Who can read this page, and for what purpose?

GoodForBotsBot received HTTP 200 via a direct request. No indexing restriction was observed in the supported homepage directives.

Sampled URL: https://subtitle.im/

Declared crawling rules

No matching refusal for this URL was found for the listed identities.

Sources and scope: declared crawling rules
  • Declared allow · Scan admission

    • GoodForBotsBot/1.0 (+https://goodforbots.com/bot)

    The recorded robots admission decision allowed our crawler to proceed.

    GoodForBotsBot admission along the homepage request chain

    https://subtitle.im/

    robots.txt is present and valid

  • Declared allow · robots.txt

    • goodforbotsbot (Site diagnostics)
    • * (Default robots group)
    • oai-searchbot (ai-search)
    • claude-searchbot (ai-search)
    • perplexitybot (ai-search)
    • mistralai-index (ai-search)
    • kimi-searchbot (ai-search)
    • amzn-searchbot (ai-search)
    • meta-webindexer (ai-search)
    • exasearchbot (ai-search)
    • aiwebindex (ai-search)
    • duckassistbot (ai-search)
    • shapbot (ai-search)
    • yandexadditional (ai-search)
    • yandexadditionalbot (ai-search)
    • gptbot (ai-training)
    • claudebot (ai-training)
    • mistralai-training (ai-training)
    • kimibot (ai-training)
    • ai2bot (Unknown)
    • applebot-extended (ai-training)
    • webzio-extended (ai-training)
    • chatgpt-user (user-fetch)
    • claude-user (user-fetch)
    • perplexity-user (user-fetch)
    • mistralai-user (user-fetch)
    • kimi-user (user-fetch)
    • amzn-user (user-fetch)
    • diffbot-user (user-fetch)
    • firecrawlagent (extraction)
    • webzio (extraction)
    • meta-externalfetcher (user-fetch, agent)
    • google-extended (ai-training, grounding)
    • meta-externalagent (ai-training, product-improvement)
    • amazonbot (ai-training, product-improvement)
    • ccbot (open-dataset, ai-training)
    • googlebot (search)
    • bingbot (search)

    No matching refusal for this URL in the applicable robots group. This is a declaration, not an access test.

    Acquisition of https://subtitle.im/

    https://subtitle.im/robots.txt

    User-agent: *
    allow: /

    robots.txt is present and validStates a position on AI crawlersAllows search and user-fetch crawlers

Observed access

GoodForBotsBot received HTTP 200 via a direct request.

Sources and scope: observed access
Coverage and interpretation
  • Crawler coverage includes the registered identities and up to 50 user-agent entries from robots.txt. Source excerpts and detail groups are bounded; omissions are labelled.
  • Observed access describes GoodForBotsBot only. Other crawler entries describe declared rules, not tests of those operators' access.
  • Coverage is the sampled homepage response and collected robots.txt files. No indexing or citation is guaranteed. Usage preferences are declarations, not a legal determination of permission.
  • This explanation adds no points or penalties. Any score effects belong to the linked checks.
  • AIPREF and Content Signals keep their own definitions. AIPREF search can include processing used exclusively for search; training preferences are not a blanket ruling on every search process.

In its category

16th of 39 in Developer Tools & APIs

  1. 1Good for Botsgoodforbots.com
  2. 2ProxyJamproxyjam.com
  3. 16subtitle.im · this reportsubtitle.im

The prompts above would take subtitle.im to 91, 4th in its category.

To the prompts ↑

Category average 63. The percentile appears once the catalogue holds a few hundred sites.

Scanned

Site profile

Login
Not established
API
Not established
Commerce
Not established

It decides which conditional checks apply. “Not established” means no proof in what we read, not proof of absence.

Scan details

Every scan is kept. Pro draws the history as a chart →

Scanned
26 Oct 2026
Rubric
0.9.0
Requests
23
Fetched
1.1 MB
Took
17.7 s
Homepage
111 ms · direct
Pages read
4
robots.txt
allowed
Which pages the scan read

The homepage and up to three pages from the sitemap and homepage links. Structured data, page structure, Markdown negotiation and typed links check each page read and take the median page; other checks read the homepage.

  • Homepagealways read
  • /blog/smart-auto-toggle-youtube-subtitles/article · from the sitemap · read
  • /blog/collection · linked from the homepage · from the sitemap · read
  • /help/linked from the homepage · from the sitemap · read

More like subtitle.im:Developer Tools & APIsProductivityWeb DevelopmentFreemium

Same category

goodforbots.com

Evaluates website readability for AI crawlers and language models with a scoring rubric

Same category

ihateimg.cv

Free browser-based image conversion, compression, and editing tools with zero server uploads

Same category

sshflow.com

SSH client built for developers providing workspaces for terminals, SFTP, and code editing

Same category

timestamp.rocks

Free tool to generate localized Discord timestamp codes and manage timezones

Same category

emailyy.online

Free browser-based email tools for signatures, subject lines, HTML previews, and header analysis

Same category

burntop.dev

Full-stack template with strict end-to-end tests for AI coding agents