Every category where a model named BookStack for a mid-market B2B company. Share is first choices across the direct, paraphrase, budget and scale prompts; rank is within every product named in that category.

Category	Function	Share	Rank	Negative rate	Labels	Quadrant	Since September 2026
Knowledge base and self-service	Customer	3%	10 of 88	12%	8	under 10 labels · led by Notion at 21%	▼−2Since September 2026: 6% → 4%, −2 points. Inside the 11-point floor: within noise. Read over the models both editions asked.

Movement

Since September 2026, BookStack held within the floor in its one category: no change cleared 11 points.

Best category · Knowledge base · by segment

Small business▲+2Since September 2026: 0% → 2%, +2 points. Inside the 11-point floor: within noise. Read over the models both editions asked.

2%from 0% in September 2026

Inside the floor by 9 pointsRank 15 → 9 of 75

Mid-market▼−2Since September 2026: 6% → 4%, −2 points. Inside the 11-point floor: within noise. Read over the models both editions asked.

4%from 6% in September 2026

Inside the floor by 9 pointsRank 6 → 9 of 85

Enterprise=heldSince September 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise. Read over the models both editions asked.

0%from 0% in September 2026

Inside the floor by 11 pointsRank 49 → 65 of 79

All categories · Mid-market

Category	September 2026	Now	Change	Reading	Rank
Knowledge base	6%	4%	▼−2Since September 2026: 6% → 4%, −2 points. Inside the 11-point floor: within noise. Read over the models both editions asked.	Within noise	Rank 6 → 10 of 88

Shares here are read over the models both editions asked, so they can differ by a point or two from the standing above, which counts every model in this edition.

The floor is 11 points of share, measured: how far the models move a leader on their own when the same questions are asked twice with nothing changed. A larger change is movement; a smaller one is noise, and both are shown. Movement is read over the twelve models both editions asked; GPT-6 Luna, Muse Glimmer 30B joined this edition and are in the standing but not yet in the comparison. How the floor is measured · The editions

By model

How each model treated BookStack across every prompt where it was named for a mid-market B2B company. Fourteen models, six prompts per category.

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Model	First choice	Alternative	Negative	Labels
Claude Haiku 4.5	1	0	0	1
GPT-5.4 mini	0	0	0	0
Gemini 3.5 Flash	0	1	0	1
Perplexity Sonar	0	1	0	1
Grok 4.20	1	0	0	1
Mistral Small	0	1	1	2
DeepSeek V4 Flash	0	0	0	0
Llama 4 Maverick	0	0	0	0
Qwen 3.7 Flash	0	0	0	0
Kimi K2	0	0	0	0
GLM 4.7 FlashX	0	1	0	1
MiniMax M2.5	0	0	0	0
GPT-6 Luna	0	1	0	1
Muse Glimmer 30B	0	0	0	0

By framing

Which of the six questions produced the naming. By model says how often; this says asked what. The first-choice count on the right carries the marks of the models that produced it.

FramingLabels by classFirst choices

Direct1 labelNone

Paraphrase0 labelsNone

Comparative1 labelNone

Budget-constrained15 labels3

Scale-constrained0 labelsNone

Negative6 labelsNone

First choiceAlternativeMentionNegative23 labels in all, every segment counted; 3 of the 3 first choices count toward share, since the comparative and negative framings do not. The bar is one segment per label class, to scale within the framing.

What the models said for it

Verbatim evidence the judge attached to positive labels.

“For companies that want to start completely free, Notion or BookStack are excellent choices” Claude Haiku 4.5 · Knowledge base · budget prompt · first choice

“go BookStack—it's the sweet spot for zero ongoing costs and pro features” Grok 4.20 · Knowledge base · budget prompt · first choice

“BookStack is the lowest-cost option: the software is free and open source, but you'll still need to account for hosting, backups, and maintenance.” GPT-6 Luna · Knowledge base · budget prompt · alternative

“If you want absolute $0 software costs and can host it yourself: Go with BookStack.” Gemini 3.5 Flash · Knowledge base · budget prompt · alternative

And against it

Verbatim evidence attached to negative labels. A warning on a product with few labels is a warning; on a product with many, it is one voice among them.

“BookStack can be challenging to maintain and lacks some of the user-friendly features” Mistral Small · Knowledge base · negative prompt · soft negative

Named alongside

The products named in the same answers as BookStack, over the 23 answers that named it. Took the first choice instead counts the answers where the other product was the first choice and BookStack was named but was not.

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ProductSame answerTook the first choice insteadHead to head

Notion22 of 2310Not among the top eight

Confluence13 of 230Not among the top eight

Nuclino9 of 231Not among the top eight

Slab8 of 233Not among the top eight

Slite8 of 230Not among the top eight

Document3607 of 230Not among the top eight

Zendesk Guide7 of 230Not among the top eight

Help Scout Docs5 of 231Not among the top eight

ProProfs Knowledge Base5 of 231Not among the top eight

Tettra5 of 230Not among the top eight

A head-to-head page exists where both products are among a category's top eight. The other rows are the same fact without a page behind them, so they link to the product instead.

What carried it into the answer

The sites and pages cited by the answers that named BookStack. A fact about retrieval, not a lever on the model.

Citations exist only for the models that return a source list, five of the fourteen in this edition, so these counts come from 23 of the 23 answers that named BookStack and are not a share of its labels.

Domains cited

learn.g2.com15

slite.com10

helpdocs.io9

ones.com9

capterra.com8

document360.com7

ferndesk.com7

helpjuice.com7

herothemes.com7

knowledgeowl.com7

Eighty-six of the eighty-six domain citations in answers naming BookStack came from somebody else's page.

Pages cited

learn.g2.com/best-knowledge-base-software11

slite.com/learn/knowledge-base-softwares10

learn.g2.com/best-free-knowledge-base-software8

document360.com/knowledge-base-software7

helpjuice.com/blog/knowledge-base-software-buying-guide6

herothemes.com/blog/free-knowledge-base-software6

kayako.com/blog/knowledge-base-software6

linkedin.com/pulse/best-knowledge-base-software-rajesh-kumar-bbpsc6

Pages are listed as the models cited them.

Search and answers

bookstackapp.com is not in Google's top ten for any of the category's searches. In the answers, BookStack takes 3% of first choices and Notion takes 21%.

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In search

Google, US estimates

Position for “knowledge base software”

–

not in the top ten

Position for “best knowledge base software”

–

not in the top ten

Searches for its name, Google: 12,100 a month (“bookstack”)
AI search demand for its name, est.: 98 a month
Organic visits to its site: about 9,396 a month
Searches its site ranks for: 229 · 50 in the top three
Sites linking to it: 3,177
Paid Google search: No ads found in the estimate; that does not mean it runs none

Ads on Google

None found in Google's ad transparency records for the US

In answers

This edition

Share of first choices

rank 10 of 88 in knowledge base

Segment leader

21%

Notion

First choices: 3 across its categories
Named in: 23 answers
Its own site cited: in 23 of the answers that named it

Search figures are US estimates from DataForSEO, read September 28, 2026; AI search demand is its modeled, directional estimate, not a count of queries to any assistant. The answers are this edition's. Two measurements side by side: neither is read as the cause of the other.

What it publishes

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Addresses on bookstackapp.com

241

subdomains included

Content

152

counted in the table below

Documentation

Product · Integration

0 · 0

Kind	Pages	Last 90 days	2025-11 to 2026-10	Latest	Categories named
Blog	149	undated
Comparison	3	undated

How it is countedHide how it is counted

Every page bookstackapp.com exposes, subdomains included. Kind is read from the address and title. The last 90 days, the latest date and the twelve months count pages by when they were published, from the site's feeds, a date in the address, or the page's own publication date, read from up to a hundred of its most recently changed pages; a page that says only when it last changed is counted in its kind but not in when, so the recent counts are a floor, and a kind none of whose pages gives a publication date reads undated. Read October 5, 2026.

Follow BookStack

An email the morning each edition publishes: where this product moved, where it held, and by how much against the noise floor. One address, confirmed by a click; a stop link in every email.

Already following? Everything you follow, with a stop for each.

The company

BookStack.

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On record

Wikidata

Website: bookstackapp.com
Founded: 2015

Fetched September 14, 2026. These describe the company, not the product's standing, and a claimed page can dispute any of them. · Wikidata

In its own words

Stated by the vendor, not checked

Positioning: A simple, open-source, self-hosted, easy-to-use platform for organising and storing information.
bookstackapp.com
For: self-hosted & enterprise environments
bookstackapp.com
Price stated: There is no cost to downloading and installing your own instance of BookStack. bookstackapp.com
Free plan or trial: There is no cost to downloading and installing your own instance of BookStack. bookstackapp.com
Certifications: MIT licensed
Not stated on the pages read: Starting price, integrations, hosting, customers

What BookStack's own pages state, read October 5, 2026: bookstackapp.com, bookstackapp.com/docs/admin/security. A claimed page can correct any of them.

Is this your product?

Claim this page

Claiming is free and changes nothing in the data. A claimed page shows a verified contact who is told when each edition publishes and when BookStack's standing changes by more than the noise floor; the right to propose corrections to the vendor table, meaning names the judge wrote that should or should not read as BookStack, applied by version and listed in the change log; and a one-line description supplied by the vendor and marked as such.

What a new claim receivesHide what a new claim receives

A new claim receives the current edition's vendor brief for BookStack by email, built from the raw record of the edition. It shows:

where BookStack is named, by buyer and by framing, and which cells hold its first choices;
the claims the models make when they name it, ranked, with the strongest and the weakest quoted;
its vocabulary against the segment leader's, and the pages the models cited;
who was chosen in the answers that did not name BookStack, and every reason the record gives;
a battlecard for each top rival: the head-to-head split, why they win, and the reservation quoted against them;
one page of published figures cleared to show a buyer.