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Browser-based PDF drawing review for engineering and construction teams. Invite reviewers, collect comments, track status, manage revisions, and export structured PDF and Excel comment registers.

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Website, pricing, platforms and company facts side by side.
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| Website | xenmark.app | alanaknows.com |
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| Company | Startup from Norway · 2026 | — |
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In their own words, as submitted to SaaSHub.


Xenmark is a browser-based PDF drawing review platform for engineering and construction teams. Upload technical drawings, add annotations and structured comments, track comment status, manage revisions, collaborate with internal and external reviewers, and export structured PDF and Excel comment...
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What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


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Overall verdict
Why this product is good
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Xenmark.app and https://alanaknows.com/.
Xenmark.app's answer
Only the project owner pays. Reviewers and collaborators join free, with no per-seat cost. Everything runs in the browser, so participants do not need specialist software installed to review and mark up drawings.
Xenmark.app's answer
General PDF tools handle annotation but not structured review workflows. Broader document management platforms can handle those workflows but often price access by participant. Xenmark sits between them: spatial pins, threaded replies, comment statuses, revision handling, and exportable comment registers — with pricing based on the project owner rather than each reviewer.
Xenmark.app's answer
Engineering, construction, and architecture teams that circulate drawings for comment across company lines — client, yard, subcontractor, consultant. Most useful where review feedback must be traceable afterwards, not just marked up once.
Xenmark.app's answer
Drawing feedback arrives scattered — marked-up PDFs, email threads, spreadsheets, chat. Someone then reconciles it by hand and works out what is still open. Xenmark was built to collapse that step: one workspace where comments, replies, statuses, and revisions stay attached to the drawing.
Xenmark.app's answer
Browser-based application built with React and Vite. Supabase provides database, authentication, and role-based permissions. Cloudflare R2 handles drawing and attachment storage; Stripe handles billing. PDF rendering and annotation run client-side.
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