YC AI visibility / Winter 2021

Most AI-visible companies in YC Winter 2021

We scored 130 active B2B and fintech companies from Y Combinator's Winter 2021 batch on how easily ChatGPT, Perplexity, Claude and AI agents can find, understand and use them. Axiom.ai leads with 98/100. Data from our crawl on October 18, 2026; scores are a homepage snapshot, not live.

Winter 2021 average score

All-YC average (+1 for this batch)

58%

of this batch have no llms.txt (all YC: 55%)

#	Company	Score	Crawlers	Content	Schema	Agents
1	Axiom.ai axiom.ai	98	95	100	100	100
1	Humaans humaans.io	98	100	94	100	100
1	Mendel mendel.com	98	100	100	100	90
1	Per Diem tryperdiem.com	98	100	94	100	100
1	Terra API tryterra.co	98	95	100	100	100
1	weweb.io weweb.io	98	95	100	100	100
7	Chatwoot chatwoot.com	97	95	94	100	100
8	Quicknode quicknode.com	96	92	94	100	100
9	Alinea alinea-invest.com	95	95	100	100	83
9	Chorus Sleep chorussleep.com	95	95	100	100	83
9	Great Question greatquestion.co	95	95	100	100	83
9	Weekday weekday.works	95	95	100	100	83
13	Popl popl.co	94	100	93	100	83
14	Hudu hudu.com	93	95	94	100	83
14	NextPay nextpay.world	93	95	94	100	83
14	Pibit.ai pibit.ai	93	95	94	100	83
14	Rulebricks rulebricks.com	93	100	89	100	83
14	Waydev waydev.co	93	100	89	100	83
14	Ziina ziina.com	93	100	89	100	83
20	Authologic authologic.com	92	95	100	100	71
20	Expent Inc expent.ai	92	95	100	100	71
20	ModernLoop modernloop.io	92	92	94	100	83
20	Ontop getontop.com	92	95	93	100	83
20	Pangea.app pangea.app	92	95	100	100	71
20	Svix svix.com	92	95	93	100	83
20	Treinta treinta.co	92	100	94	100	74
20	ZOKO zoko.io	92	95	91	100	83
28	Feroot Security feroot.com	91	95	94	100	74
28	LiveFlow liveflow.com	91	95	94	100	74
28	Topline Pro toplinepro.com	91	89	94	100	83
28	Version Story Compare versionstory.com	91	92	87	100	88
32	Abacum abacum.ai	90	95	94	100	71
32	Cyble cyble.com	90	100	94	100	62
32	Fintoc fintoc.com	90	95	94	100	71
32	Prequel prequel.co	90	95	93	100	71
36	Encord encord.com	89	95	81	100	83
36	GimBooks gimbooks.com	89	92	93	100	74
36	Prospa getprospa.com	89	95	96	100	62
36	RocketSDR rocketsdr.ai	89	95	94	100	64
40	Greywing grey-wing.com	88	95	94	100	62
41	authzed authzed.com	87	100	94	20	100
42	Alokai alokai.com	86	100	94	100	47
42	FlutterFlow flutterflow.io	86	100	94	100	47
42	Webiny webiny.com	86	95	100	100	47
45	Axolo axolo.co	85	95	94	100	47
45	gaiia gaiia.com	85	100	89	100	47
45	Gigs gigs.com	85	100	78	100	64
45	GroMo gromo.in	85	95	85	100	62
45	Rethoric rethoric.com	85	89	93	100	62
45	Shepherd shepherdinsurance.com	85	95	94	100	47
51	AgendaPro agendapro.com	84	100	93	100	38
51	BrioHR briohr.com	84	92	94	100	47
51	Finary.com finary.com	84	95	87	20	100
51	hoop.dev hoop.dev	84	100	87	100	47
51	Lendflow lendflow.com	84	95	94	20	90
51	Solo solosuit.com	84	95	91	100	47
51	Spline spline.design	84	100	94	20	83
51	Vuiapp vuiapp.vn	84	100	85	100	47
59	Avocado avocadopos.com	83	100	100	20	74
59	Darrow darrow.ai	83	95	87	100	47
59	Djamo djamo.com	83	95	93	100	42
59	Runway runway.team	83	95	89	100	47
63	ROGER thanksroger.com	82	95	91	88	47
63	Udhaar App udhaar.pk	82	95	94	100	35
65	Re2 re2.ai	81	95	91	20	83
66	CashBook cashbook.in	80	95	89	20	83
66	cloud humans cloudhumans.com	80	100	81	100	35
66	Joingerald joingerald.com	80	100	81	20	83
66	Mayan mayan.co	80	95	93	67	47
66	Ollama ollama.com	80	100	46	100	83
71	Alpas alpas.ai	79	100	91	67	38
71	Arpio arpio.io	79	95	74	100	47
71	MagicBell magicbell.com	79	95	100	20	64
71	QuotaBook quotabook.com	79	95	89	67	47
71	Tint tint.ai	79	95	100	20	64
76	Soraban soraban.com	78	95	94	88	26
77	Bloom bloomapp.com	77	85	81	100	47
77	Meru.com meru.com	77	95	93	20	64
77	PowerRouter powerrouter.io	77	95	82	88	38
77	Taloflow taloflow.ai	77	89	74	100	47
77	Topkey topkey.io	77	100	79	20	74
82	Kodo kodo.com	75	95	85	8	71
83	arnata arnata.com	74	95	74	100	26
83	Firstbase.io firstbase.io	74	95	81	20	64
85	Rinsed rinsed.com	73	95	91	20	47
86	Haystack usehaystack.io	72	95	87	20	47
86	LogisticsOS logisticsos.com	72	89	100	8	47
88	Fractional fractional.app	71	95	85	20	47
88	OpenCode opencode.ai	71	100	74	20	52
90	Infracost infracost.io	70	95	81	20	47
90	Spokn getspokn.com	70	95	89	20	38
92	Jetdocs jetdocs.io	69	85	94	8	47
92	Wasp wasp-lang.dev	69	95	71	8	62
94	Reclaim Protocol reclaimprotocol.org	68	80	93	20	47
94	SwiftSku swiftsku.com	68	95	83	20	38
94	The Third Place thethirdplace.is	68	100	91	8	26
94	Waypoint usewaypoint.com	68	82	89	20	47
98	Atrato atratopago.com	67	85	93	20	38
99	clicOH clicoh.com	66	80	94	20	35
99	Flux iflux.app	66	100	78	20	26
99	HUBUC hubuc.com	66	95	83	20	26
99	Vendease vendease.com	66	92	94	8	26
99	Voosh voosh.ai	66	95	74	20	38
104	FlowEQ floweq.com	65	85	76	20	47
104	Text Blaze blaze.today	65	91	82	8	38
106	Tupelo tupelosmb.com	64	95	76	8	35
107	Bluelight usebluelight.com	63	95	72	8	38
107	BusinessOnBot businessonbot.com	63	95	74	20	26
107	Supadock getsupadock.com	63	80	96	8	26
107	Venu AI venu3d.com	63	85	85	20	26
111	Pagaloop pagaloop.com	61	95	61	20	35
112	Broad broad.app	60	85	59	20	47
112	Flextock flextock.com	60	85	83	8	26
112	Sivo sivo.com	60	85	68	20	35
115	Business business.stayflexi.com	59	95	38	8	62
115	Compose.ai compose.ai	59	80	61	20	47
115	Logica logica.cloud	59	95	52	20	35
118	Seer helloseer.com	58	85	70	20	26
119	Manara manara.tech	54	100	37	20	26
119	Sendbox sendbox.co	54	85	63	8	26
121	Estoca estoca.com.br	51	95	38	8	26
121	Z1 z1.app	51	85	50	8	26
123	peopleCQ peoplecq.com	48	95	27	8	26
124	Dayra dayra.co	47	89	31	8	26
124	True3D true3d.com	47	85	38	8	26
126	Kredi kredi.mx	46	95	23	8	26
127	Parsagon parsagon.io	42	85	19	8	26
127	Smartcuts trysmartcuts.com	42	85	20	8	26
129	Bimaplan bimaplan.co	41	85	18	8	26
130	LightTwist lighttwist.com	40	85	14	8	26

Sub-scores: Crawlers = AI crawler access, Content = answer-engine content, Schema = structured data, Agents = agent readiness (llms.txt, API/MCP). Ties share a rank.

YC Winter 2021 vs all of YC

Area	Winter 2021	All YC
Overall score	78	77
AI crawler access	94	93
Answer-engine content	83	82
Structured data	60	62
Agent readiness	57	56

Most common gaps in YC Winter 2021

No discoverable API or MCP for agents85% (all YC: 87%)

No question & answer content72% (all YC: 71%)

No llms.txt58% (all YC: 55%)

No product / organization schema48% (all YC: 46%)

No JSON-LD structured data at all46% (all YC: 43%)

No docs / help content linked37% (all YC: 46%)

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Other YC batches

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Methodology: how the YC dataset was built. Batch labels come from Y Combinator's public directory; RankRoot is not affiliated with Y Combinator.