RankRoot Research · Data from October 18, 2026 · Download the data (CSV)

AI visibility of 2,538 Y Combinator companies (2026)

Name: AI visibility of Y Combinator companies 2026 (RankRoot)
Creator: RankRoot
License: https://creativecommons.org/licenses/by/4.0/

Startups increasingly get discovered when someone asks ChatGPT, Perplexity, Claude or an AI agent which tool to use. We ran the same 22-point audit behind RankRoot on the homepages of 2,538 active Y Combinator B2B and fintech companies. The average score is 77/100 (median 80); 13 companies passed every check.

55%

have no llms.txt

46%

don't tell AI who they are (no organization or product schema)

71%

have no question & answer content, the format people use to prompt AI

17%

show little or no content unless JavaScript runs

17%

have no sitemap.xml for AI crawlers to find their pages

Leaderboards by batch

YC Fall 2026 (84)YC Summer 2026 (131)YC Spring 2026 (129)YC Winter 2026 (137)YC Fall 2025 (92)YC Summer 2025 (117)YC Spring 2025 (98)YC Winter 2025 (107)YC Fall 2024 (56)YC Summer 2024 (152)YC Winter 2024 (133)YC Summer 2023 (120)YC Winter 2023 (136)YC Summer 2022 (114)YC Winter 2022 (177)YC Summer 2021 (160)YC Winter 2021 (130)YC Summer 2020 (66)YC Winter 2020 (69)YC Summer 2019 (44)YC Winter 2019 (50)YC Summer 2018 (30)YC Winter 2018 (26)YC Summer 2017 (19)YC Winter 2017 (17)YC Summer 2016 (15)YC Winter 2016 (25)YC Summer 2015 (16)YC Winter 2015 (13)YC Summer 2014 (8)YC Winter 2014 (9)YC Summer 2013 (5)YC Winter 2013 (6)YC Summer 2012 (12)YC Winter 2012 (5)YC Summer 2011 (9)YC Winter 2011 (5)

Every company

Click a column to sort. Sub-scores are out of 100. Open any company for its full list of issues.

1–100 of 2,538

#
1	Brainbase Labs brainbaselabs.com	Winter 2024	100	100	100	100	100
1	Kestrel AI usekestrel.ai	Fall 2025	100	100	100	100	100
1	LemonSlice lemonslice.com	Winter 2024	100	100	100	100	100
1	Locus paywithlocus.com	Fall 2025	100	100	100	100	100
1	Maven Bio mavenbio.com	Summer 2023	100	100	100	100	100
1	Razorpay razorpay.com	Winter 2015	100	100	100	100	100
1	Rivet rivet.dev	Winter 2023	100	100	100	100	100
1	Rootly rootly.com	Summer 2021	100	100	100	100	100
1	Slidely AI slidely.ai	Summer 2022	100	100	100	100	100
1	UserGems usergems.com	Summer 2014	100	100	100	100	100
1	Verbiflow verbiflow.com	Winter 2025	100	100	100	100	100
1	winfunc winfunc.com	Summer 2024	100	100	100	100	100
1	Zinc zinc.com	Winter 2014	100	100	100	100	100
14	Activepieces activepieces.com	Summer 2022	98	95	100	100	100
14	Adam adam.new	Winter 2025	98	95	100	100	100
14	AgentMail agentmail.to	Summer 2025	98	95	100	100	100
14	Agentmuxer agentmuxer.com	Summer 2026	98	95	100	100	100
14	Axiom.ai axiom.ai	Winter 2021	98	95	100	100	100
14	Bird bird.com	Summer 2016	98	100	94	100	100
14	Blink blink.new	Winter 2022	98	95	100	100	100
14	Boat boat.dev	Fall 2026	98	95	100	100	100
14	borong borong.com	Winter 2020	98	95	100	100	100
14	Browser Use browser-use.com	Winter 2025	98	95	100	100	100
14	Cerebrium cerebrium.ai	Winter 2022	98	100	94	100	100
14	Cheers cheers.tech	Summer 2024	98	95	100	100	100
14	Clarm clarm.com	Spring 2025	98	100	100	100	90
14	Clueso clueso.io	Winter 2023	98	95	100	100	100
14	cmux cmux.com	Summer 2024	98	95	100	100	100
14	Corgea corgea.com	Summer 2023	98	95	100	100	100
14	Cosmic cosmicjs.com	Winter 2019	98	95	100	100	100
14	Cua cua.ai	Spring 2025	98	100	93	100	100
14	Databuddy databuddy.cc	Fall 2026	98	95	100	100	100
14	DemandSphere demandsphere.com	Summer 2010	98	95	100	100	100
14	Didit didit.me	Winter 2026	98	95	100	100	100
14	Floot floot.com	Summer 2025	98	100	94	100	100
14	Freestyle freestyle.sh	Summer 2024	98	95	100	100	100
14	Gauge withgauge.com	Summer 2024	98	95	100	100	100
14	HackerRank hackerrank.com	Summer 2011	98	95	100	100	100
14	HitPay hitpayapp.com	Summer 2021	98	100	94	100	100
14	Humaans humaans.io	Winter 2021	98	100	94	100	100
14	Inth inth.com	Spring 2026	98	100	93	100	100
14	Invopop invopop.com	Winter 2023	98	95	100	100	100
14	Lattice lattice.com	Winter 2016	98	100	94	100	100
14	Lucent lucenthq.com	Winter 2026	98	95	100	100	100
14	Memberstack memberstack.com	Summer 2020	98	95	100	100	100
14	Mendel mendel.com	Winter 2021	98	100	100	100	90
14	MixRank mixrank.com	Summer 2011	98	100	94	100	100
14	Omnara omnara.com	Summer 2025	98	95	100	100	100
14	OpenWork openworklabs.com	Spring 2026	98	95	100	100	100
14	Outlit outlit.ai	Winter 2025	98	95	100	100	100
14	Per Diem tryperdiem.com	Winter 2021	98	100	94	100	100
14	Pinnacle pinnacle.sh	Summer 2024	98	100	94	100	100
14	PredictLeads predictleads.com	Summer 2019	98	100	93	100	100
14	PumpGTM pumpgtm.com	Spring 2026	98	95	100	100	100
14	Quickchat AI quickchat.ai	Summer 2018	98	95	100	100	100
14	Revnu revnu.com	Spring 2026	98	95	100	100	100
14	Riveter riveterhq.com	Fall 2024	98	95	100	100	100
14	Roboflow roboflow.com	Summer 2020	98	100	94	100	100
14	Signadot signadot.com	Winter 2020	98	95	100	100	100
14	Sitefire sitefire.ai	Winter 2026	98	95	100	100	100
14	Slash slash.com	Summer 2021	98	95	100	100	100
14	Sprites sprites.ai	Winter 2022	98	95	100	100	100
14	Suger suger.io	Winter 2023	98	95	100	100	100
14	Superset superset.sh	Spring 2026	98	95	100	100	100
14	Terra API tryterra.co	Winter 2021	98	95	100	100	100
14	Thera getthera.com	Summer 2022	98	95	100	100	100
14	Vector vector.co	Winter 2023	98	95	100	100	100
14	Voicepanel voicepanel.com	Winter 2024	98	95	100	100	100
14	weweb.io weweb.io	Winter 2021	98	95	100	100	100
70	Anakin anakin.io	Summer 2021	97	95	94	100	100
70	Archal archal.ai	Summer 2026	97	95	94	100	100
70	Arketa arketa.com	Summer 2020	97	95	94	100	100
70	Artisan artisan.co	Winter 2024	97	95	94	100	100
70	Buxfer buxfer.com	Winter 2007	97	95	94	100	100
70	Captain captain.dev	Winter 2026	97	95	94	100	100
70	Caretta caretta.so	Winter 2026	97	95	94	100	100
70	Chatwoot chatwoot.com	Winter 2021	97	95	94	100	100
70	Conduit conduit.ai	Winter 2024	97	95	94	100	100
70	Converge runconverge.com	Summer 2023	97	95	94	100	100
70	Dart dartai.com	Winter 2022	97	95	94	100	100
70	Diversion diversion.dev	Summer 2022	97	95	94	100	100
70	Increase increase.com	Summer 2020	97	100	91	100	100
70	Infinia infiniaweb.com	Winter 2023	97	95	94	100	100
70	KERNEL kernel.sh	Summer 2025	97	95	94	100	100
70	Limrun lim.run	Spring 2026	97	95	94	100	100
70	MadeThis madethis.com	Fall 2025	97	95	94	100	100
70	Mem0 mem0.ai	Summer 2024	97	100	89	100	100
70	Metorial metorial.com	Fall 2025	97	95	94	100	100
70	Minicor minicor.com	Spring 2026	97	95	94	100	100
70	Mireye mireye.com	Summer 2026	97	95	100	88	100
70	Momentic momentic.ai	Winter 2024	97	95	94	100	100
70	Nash usenash.com	Summer 2021	97	95	94	100	100
70	Numeral numeral.com	Winter 2023	97	95	94	100	100
70	Nyckel nyckel.com	Winter 2022	97	95	94	100	100
70	Pally pally.com	Summer 2025	97	95	94	100	100
70	ParadeDB paradedb.com	Summer 2023	97	95	94	100	100
70	Paragon useparagon.com	Winter 2020	97	95	94	100	100
70	Ploid ploid.com	Fall 2026	97	95	94	100	100
70	Ploy ploy.ai	Spring 2026	97	100	94	88	100
70	Pluggy pluggy.ai	Summer 2021	97	95	94	100	100

1–100 of 2,538

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Scores by area

AI crawler access93/100

Answer-engine content82/100

Structured data62/100

Agent readiness56/100

Most common gaps

No discoverable API or MCP for agents87%

No question & answer content71%

No llms.txt55%

No docs / help content linked46%

No product / organization schema46%

No JSON-LD structured data at all43%

Methodology

Sample: 2,538 companies listed as active in Y Combinator's public company directory under B2B or Fintech, with a working website. For each company we fetched the homepage, robots.txt, sitemap and llms.txt once with RankRootBot between October 17, 2026 and October 18, 2026. This is a homepage-only snapshot: it does not cover docs, blogs or product pages, and it is not updated automatically. The 22 checks fall into four areas, each scored 0 to 100 and weighted into one score:

AI crawler access: HTTPS, robots.txt present, AI search bots allowed (OAI-SearchBot, PerplexityBot, Claude-SearchBot), AI training bots, XML sitemap, homepage indexable, response time (excluded here).
Answer-engine content: text visible without JavaScript, title tag, meta description, single H1, section headings, question-and-answer content, Open Graph tags, declared language.
Structured data: any JSON-LD, Organization/Product entity schema, sameAs brand profiles.
Agent readiness: llms.txt, discoverable API or MCP server, machine-readable pricing, linked docs.

Response time is measured but excluded from the issue counts because batch crawling makes it noisy. Batch labels and company descriptions come from Y Combinator's directory. RankRoot is not affiliated with Y Combinator. This dataset is separate from the 538-site AI Visibility Index and the State of AI Visibility 2026 study.

Use this data

Free to use under CC BY 4.0. Please link to this page when you cite it:

<a href="https://getrankroot.com/yc">AI visibility of Y Combinator companies (RankRoot, 2026)</a>

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