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
Knowledge base and self-service	Customer	6%	6 of 96	15%	13	accepted challenger

Movement

This is the first edition on this tier, so no move can be computed for BookStack yet. The next is due October 1, 2026. From the next edition this section shows, per buyer segment, whether its share moved by more than the measured noise floor.

By model

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

Model	First choice	Alternative	Mention	Negative	Labels
Claude Haiku 4.5	0	1	0	0	1
GPT-5.4 mini	0	0	0	0	0
Gemini 3.5 Flash	1	0	0	0	1
Perplexity Sonar	0	1	0	0	1
Grok 4.1 Fast	0	2	1	0	3
Mistral Small	1	0	0	1	2
DeepSeek V4 Flash	0	1	0	0	1
Llama 4 Maverick	0	0	0	0	0
Qwen 3.7 Flash	0	1	0	0	1
Kimi K2	0	1	0	0	1
GLM 4.7 FlashX	1	0	0	0	1
MiniMax M2.5	0	0	0	1	1

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

Direct0 labelsNone

Paraphrase0 labelsNone

Comparative3 labelsNone

Budget-constrained18 labels3

Scale-constrained1 labelNone

Negative12 labelsNone

First choiceAlternativeMentionNegative34 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.

“Choose BookStack if you have access to an IT administrator, want to host your own data, and want a completely free tool with no user limits.” Gemini 3.5 Flash · Knowledge base · budget prompt · first choice

“BookStack offers the best balance of being completely free, easy to use, and requiring minimal technical overhead” Mistral Small · Knowledge base · budget prompt · first choice

“If you have technical resources: Start with BookStack or Outline (self-hosted) - lowest long-term cost” GLM 4.7 FlashX · Knowledge base · budget prompt · first choice

“Best if you have tech resources - 100% free open-source, but requires server hosting and maintenance” DeepSeek V4 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.

“High-Risk Tools to Avoid ... BookStack ... Performance degrades significantly with large interconnected databases” Mistral Small · Knowledge base · negative prompt · hard negative

“these are solid but require technical resources to manage properly” MiniMax M2.5 · Knowledge base · negative prompt · soft negative

Named alongside

The products named in the same answers as BookStack, over the 34 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.

ProductSame answerTook the first choice insteadHead to head

Notion31 of 3412Not in the top three

Confluence27 of 342Not in the top three

Helpjuice16 of 343Not in the top three

Document36015 of 341Not in the top three

Slab15 of 341Not in the top three

Guru14 of 340Not in the top three

Tettra14 of 340Not in the top three

Nuclino13 of 341Not in the top three

Outline11 of 340Not in the top three

Slite8 of 342Not in the top three

A head-to-head page exists where both products are in a category's top three. 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, four of the twelve in this edition, so these counts come from 5 of the 34 answers that named BookStack and are not a share of its labels.

Domains cited

slite.com4

featurebase.app3

ferndesk.com3

freshworks.com3

learn.g2.com3

sparrowdesk.com3

zendesk.com3

assembly.com2

bolddesk.com2

helpdocs.io2

Twenty-eight of the twenty-eight domain citations in answers naming BookStack came from somebody else's page.

Pages cited

ferndesk.com/blog/best-knowledge-base-for-small-teams3

learn.g2.com/best-free-knowledge-base-software3

slite.com/learn/knowledge-base-softwares3

sparrowdesk.com/tools/best-knowledge-base-software3

assembly.com/blog/best-knowledge-base-software2

bolddesk.com/blogs/best-knowledge-base-software2

featurebase.app/blog/best-knowledge-base-software2

freshworks.com/knowledge-base/software2

Pages are listed as the models cited them.

The company

BookStack.

Website: bookstackapp.com
Founded: 2015

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

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.

It does not get any change to labels, shares or verdicts, any preview, or any say over which quotes appear. A verification link goes to your work email; an address at bookstackapp.com is approved on the spot, any other address is reviewed by hand.

Your name and company appear on the claimed page, or the company alone if you ask below. A title and a LinkedIn address appear there too if you give them, and are left off if you do not. Your email address is never published.