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Mentionable Index

Which sources do AI engines cite in AI tools & assistants?

The index lists 244 domains cited in AI tools & assistants. youtube.com leads with 4,107 citations, or 10% of those domains' citations.

244
Domains cited
41,448
Citations measured
10%
youtube.com share
17%
Top 10 share

How each engine cites in AI tools & assistants

Citations of index domains per answer, against the same engine across the whole index. In the text of the answer: 77% in this sector, 74% across the index.

EngineCitations per answerIn the text
ChatGPT
ChatGPT		5.951%
Perplexity
Perplexity		6.9100%
Gemini
Gemini		1.199%
Copilot
Copilot		4.3100%
Google AI Mode
Google AI Mode		12.441%
Google AI OverviewAIO
Google AI Overview		7.5100%
Claude
Claude		4.5100%

AI tools & assistants ranking

Ranked by number of citations recorded over the period.

#DomainCitations
1youtube.com4,107
2reddit.com2,556
3synthesia.io2,036
4heygen.com1,944
5arxiv.org1,555
6fr.wikipedia.org1,423
7littlebigthings.fr1,331
8digitiz.fr859
9en.wikipedia.org840
10linkedin.com813
11ia.agency706
12fr.linkedin.com588
13brand24.com578
14builtin.com508
15businessinsider.com472
16lafabriquedunet.fr471
17techradar.com426
18canva.com373
19ey.com362
20veed.io361
21jedha.co359
22webconversion.fr349
23francenum.gouv.fr347
24teachizy.fr341
25blogdumoderateur.com339
26usinenouvelle.com331
27searchengineland.com330
28speechify.com326
29keyweo.com321
30sortlist.fr319
31eskimoz.fr308
32agence-geo.agency304
33noiise.com294
34lespepitestech.com292
35eesel.ai287
36meltwater.com274
37adobe.com271
38support.microsoft.com270
39prnewswire.com269
40seo.fr269
41clickup.com267
42zapier.com267
43trysight.ai261
44ahrefs.com259
45julien-gourdon.fr259
46e-marketing.fr257
47glassdoor.com254
48semrush.com251
49ipsos.com250
50meilleures-agences-geo-aio.fr250
51impli.fr247
52medium.com242
53datashake.fr240
54strategies.fr240
55almcorp.com233
56forbes.com231
57ispring.fr231
58natural-net.fr223
59cartelis.com195
60openai.com195
61docebo.com193
62hubspot.fr188
63support.google.com188
64jalousie.agency179
65koino.fr176
66abondance.com166
67github.com166
68newp.fr159
69hubspot.com156
70tool-advisor.fr152
71seranking.com151
72mentionable.ai150
73clubic.com148
74oli-via-net.fr135
75instagram.com130
76salesforce.com125
77shopify.com118
78uclic.fr116
79fr.scribd.com114
80sciencedirect.com114
81facebook.com110
82senek.com110
83adimeo.com108
84uplix.fr104
85optimize360.fr103
86capital.fr102
87livementor.com100
8820minutes.fr99
89codeur.com99
90archipelmarketing.com97
91learn.microsoft.com97
92techtarget.com97
93360learning.com95
94designrush.com93
95ecole.cube.fr92
96g2.com87
97digitalunicorn.fr86
98ouest-france.fr85
99play.google.com84
100marketing-management.io82

Frequently asked questions

Which website do AI engines cite most in AI tools & assistants?
youtube.com comes first with 4,107 citations, followed by reddit.com (2,556), synthesia.io (2,036), heygen.com (1,944), and arxiv.org (1,555).
Do you need mentions on many sites to be visible in AI answers in AI tools & assistants?
Yes. The 10 most cited domains take only 17% of the citations: AI engines draw on 3,971 other sites in this sector.
Which AI engine relies on the most sources in AI tools & assistants?
Google AI Mode, with 12.4 citations per answer on average, against 1.1 for Gemini. Across the whole index, Google AI Mode averages 5.2.
How do you get cited by AI engines in AI tools & assistants?
Start with the sites AI engines already rely on in this sector, led by youtube.com, reddit.com, and synthesia.io. A mention on those pages puts you where engines look for their answers. On your own prompts, Mentionable shows the exact URLs cited and the brands recommended in your place.

Methodology

ChatGPT
Claude
Copilot
Gemini
Google AI OverviewAIO
Google AI Mode
Grok
Perplexity

21,727 AI responses analyzed across AI tools & assistants, on 8 engines, from February 2026 to September 2026. Citations come from the prompts tracked on Mentionable.

Latest data point: . Updated weekly.

Full methodology

And on your own prompts?

This ranking covers the whole AI tools & assistants sector. Mentionable tracks your brand on your own prompts, every day.

  • The exact URLs cited on your prompts
  • The brands recommended in your place
  • All 7 engines tracked every day
  • The prompts where you never show up
  • The sources to work on to get in
  • The questions AI engines actually ask
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