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Research · head to head

Mendeley vs Valispace

Mendeley logo

Mendeley

Research

The free all-in-one reference manager

From
Free
Rated
-
Full reviewWebsite
Valispace logo

Valispace

Research

Requirements and systems engineering for hardware teams, with published per-seat pricing

From
$999/year
Rated
-
Full reviewWebsite

The short version

  • Only Mendeley has a free tier, so it costs nothing to try first.
  • Each has a real cost: Mendeley free tier limited to 5 Reading Assistant questions per month and 2GB storage; Valispace the three-seat minimum means a solo consultant or a two-person startup pays for a seat nobody uses, roughly 3,000 US dollars a year before anyone logs in.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Mendeley and Valispace actually diverge.

Attributes where Mendeley and Valispace differ
AttributeMendeleyValispace
Starting priceFree$999/year
Pricing modelfreemiumPer user per year
Free tierYesNo
PlatformsWebWeb, On-premise, API

Identical on both: user rating (Not yet rated), category (Research).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Mendeley

Nothing recorded that Valispace does not also cover.

Only in Valispace

  • Live requirements
  • Budgets and margins
  • Component tree
  • Verification and validation
  • Python API and Jupyter
  • ValiAssistant
  • SSO and MFA

What people use each for

The jobs each tool is most often brought in to do.

Mendeley

  • Storing and organizing large research librariesnot Valispace
  • Searching and querying PDFs in librarynot Valispace
  • Uncovering patterns and connections across referencesnot Valispace
  • Comparing experimental data across multiple studiesnot Valispace

Valispace

  • A small satellite team keeping mass and power budgets live across a design cycle instead of rebuilding spreadsheets before each reviewnot Mendeley
  • A drone manufacturer that needs requirement traceability for a certification authority but cannot justify an enterprise requirements databasenot Mendeley
  • A university engineering department teaching systems engineering with real traceability under the flat education ratenot Mendeley
  • An electronics-heavy hardware startup wanting requirements linked to the PCB design work happening in Altiumnot Mendeley

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Mendeley

  • Free tier limited to 5 Reading Assistant questions per month and 2GB storage
  • Annual billing required to receive one free month equivalent discount
  • Storage limits restricted on Plus (5GB) and Pro (10GB) tiers

Valispace

  • The three-seat minimum means a solo consultant or a two-person startup pays for a seat nobody uses, roughly 3,000 US dollars a year before anyone logs in.
  • Ownership has changed twice in two years, from independent to Altium to Renesas by way of the Altium acquisition, and the technology has been repackaged as the Altium Requirements Portal, so the standalone roadmap is genuinely uncertain.
  • It is not a certified DO-178C or ARP4754 toolchain component in the way established requirements databases are, so highly regulated aerospace programmes may still need a recognised tool alongside it.
  • The parametric model rewards teams who structure their data properly at the start; teams that import a flat requirement list get a slower version of a document tool and none of the budget automation.
  • Integration depth outside the Altium and Jira world is limited, so linking to an existing PLM or a CAD-driven mass properties source usually means writing against the Python API yourself.

Pricing, plan by plan

Mendeley

Free
  • FreeFree
    • 2GB storage
    • 5 Reading Assistant questions per month
  • Plus$4.99/month
    • Unlimited Reading Assistant
    • 5GB storage
    • $55/year annual billing
  • Pro$9.99/month
    • Unlimited Reading Assistant
    • Compare Experiments
    • Ask My Library
  • Max$14.99/month
    • Unlimited Reading Assistant
    • Compare Experiments
    • Ask My Library

Valispace

$999/year
  • Valispace$999/year
    • Minimum three users
    • Requirements, components, V&V and analysis modules
    • ValiAssistant AI beta
  • Enterprise$undefined/year
    • On-premise deployment option
    • Staging servers with controlled update timing
    • Advanced support terms
  • Education$1000/year
    • Flat annual rate for an institution
    • Unlimited students and professors
    • Non-commercial projects only

Which should you pick?

Choose Mendeley if

  • You want to start without paying.
Mendeley review

Choose Valispace if

  • You need live requirements.
  • You work on Web, On-premise, API.
  • You also want budgets and margins.
Valispace review

Questions people ask

Is Mendeley or Valispace better?
Neither clearly leads. Mendeley starts at Free and Valispace at $999/year, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mendeley or Valispace?
Mendeley has a free tier; the other does not. Paid plans start at Free for Mendeley and $999/year for Valispace.
Does Mendeley or Valispace run on more platforms?
Mendeley runs on Web. Valispace runs on Web, On-premise, API.
Can I use Mendeley for free?
Yes. Mendeley has a free tier, so you can try it without paying. Valispace starts at $999/year.
What is Mendeley best used for?
Mendeley is most often used for storing and organizing large research libraries, searching and querying pdfs in library, uncovering patterns and connections across references, comparing experimental data across multiple studies. Of those, storing and organizing large research libraries and searching and querying pdfs in library are not what Valispace is typically brought in for.
What can Mendeley do that Valispace cannot?
Valispace covers Live requirements, Budgets and margins, Component tree, Verification and validation.

Answered from the vendors’ own pages

Mendeley: How much does Mendeley Premium cost?

Mendeley Plus costs $4.99 per month or $55 per year. Pro tier costs $9.99 per month or $110 per year. Max tier costs $14.99 per month or $165 per year. All annual plans include one free month of service.

Source
Valispace: Who owns Valispace?

Altium acquired it in December 2023, and Renesas Electronics acquired Altium in 2024. It is therefore a Renesas-owned product, despite frequent reports elsewhere linking it to defence groups.

Mendeley: Is there a free version of Mendeley?

Yes, Mendeley offers a free tier with 2GB of storage and 5 Reading Assistant questions per month. No credit card is required for the free plan.

Source
Valispace: Is it the same thing as the Altium Requirements Portal?

They share a lineage. Requirements Portal is the Altium 365 packaging of Valispace technology. The standalone Valispace product is still sold with its own pricing.

Mendeley: What storage do different Mendeley plans include?

The free tier includes 2GB storage. Plus tier provides 5GB storage. Pro tier includes 10GB storage. Max tier offers unlimited storage across all your research libraries.

Source
Valispace: What does it actually cost?

999 US dollars per user per year with a minimum of three users, billed annually. Enterprise with on-premise deployment is quoted separately.

Valispace: Can it replace a requirements database like DOORS?

For small and mid-sized hardware programmes, often yes. For programmes with contractual tool mandates, no.

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