
GeometryViewer
GrabCAD Workbench
Online 3D Viewer
3D Viewer Online
3D Viewer Max
3DViewer.co
Open3D Viewer
Review 3D CAD models, PDFs and images in your browser. Share a link, collect pinpointed feedback. No CAD license needed. Free to start.
Doorstop
Valispace
rmtoo
ReqView
Innoslate
Enterprise Architect
Pearls
Reqflow is a free and open-source tool for traceability of requirements across documents, designed to analyse documents with speed and efficiency.

Which is more popular?
Based on our record, Reqflow seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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R
Reqflow
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|---|---|---|
| Website | revievv.io | goeb.github.io |
| Pricing | — | |
| Company | Startup from Poland · 1 - 9 employees · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.

Revievv lets engineering teams review 3D CAD models (STEP/STL), PDFs and images directly in the browser. Pin comments on specific points of a 3D model, track issues with severity levels, and share a review link — reviewers don't need a CAD license or even an account. Upload a STEP file, invite...
No description of Reqflow yet.
What each product offers, as listed by its team.

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

Overall verdict
Why this product is good
Recommended for
No analysis of Reqflow yet.
Walkthroughs and reviews on video.
Revievv mấy món đồ độc lạ - Khay chia ngăn tủ lạnh, móc treo đồ #hottrend2025 #review #viral
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How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing Revievv and Reqflow.
Revievv's answer
Reviewers don't need a CAD license, an account, or any installed software. Just a link. Most design review tools charge per seat or require everyone to have CAD software. Revievv gives unlimited free reviewers on every plan - so your suppliers, clients and cross-functional teammates can give feedback without any barriers.
Revievv's answer
Some competitors costs six figures and takes months to deploy. Revievv starts at $0, works in 30 seconds, and does what engineering teams actually need: open a CAD file, pin comments on the 3D model, share a link, collect feedback. No procurement process, no IT department required.
Revievv's answer
Mechanical and electrical engineers in teams of 5-50 people — product design, manufacturing, automotive, aerospace. Engineers who send STEP files by email, mark up screenshots in PowerPoint, and lose feedback in chat threads. Also useful for engineering managers who need documented, traceable design reviews instead of meeting notes in Excel.
Revievv's answer
Built by an engineer with ADHD who got tired of the same broken design review process, also had problems with doing all those related topics — screenshots in PowerPoint, feedback lost in email threads, "see attachment page 3 top left corner." Every CAD collaboration tool was either enterprise-priced or view-only. Revievv fills the gap: real design review with 3D markup, simple enough to start in 30 seconds, affordable enough for a small team.
Revievv's answer
Three.js for 3D rendering, OpenCascade for STEP/STL geometry processing, Next.js for the web application, and cloud infrastructure for file conversion. Everything runs in the browser — no plugins or desktop installation needed.
Revievv's answer
Revievv is an early-stage product used by small and mid-size engineering teams. We're focused on onboarding our first 100 customers — teams that need fast, affordable design review without enterprise overhead.
Share your experience with using Revievv and Reqflow. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Tracking Revievv since Apr 2026.
With a small team, I'm using an open source tool called reqflow (https://goeb.github.io/reqflow/) to track requirement to source code with a Doxygen keyword //! \ref RQ-xxxx. It's generating a traceability matrix and is quite simple to... - Source: Hacker News / over 4 years ago
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