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Research · head to head

Mendeley vs Terra

Mendeley logo

Mendeley

Research

The free all-in-one reference manager

From
Free
Rated
-
Full reviewWebsite
Terra logo

Terra

Research

Open biomedical research platform for genomic analysis, priced only by the cloud you consume

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Mendeley free tier limited to 5 Reading Assistant questions per month and 2GB storage; Terra the absence of a licence fee hides the real cost driver: an idle notebook virtual machine left running overnight, or a workspace bucket full of intermediate workflow outputs, quietly consumes grant money with no vendor invoice to prompt a review.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Mendeley and Terra actually diverge.

Attributes where Mendeley and Terra differ
AttributeMendeleyTerra
Pricing modelfreemiumOpen source, no licence fee
PlatformsWebWeb, Google Cloud, Microsoft Azure

Identical on both: starting price (Free), free tier (Yes), 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 Terra does not also cover.

Only in Terra

  • No platform licence fee
  • Cloud pass-through billing
  • WDL workflow execution
  • Notebook environments
  • Controlled-access data
  • Workspace sharing
  • Compliance posture
  • Multi-cloud

What people use each for

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

Mendeley

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

Terra

  • A genomics lab running whole-genome alignment and variant calling pipelines without provisioning or maintaining a local clusternot Mendeley
  • A consortium sharing controlled-access human data across institutions where the data cannot be copied to each sitenot Mendeley
  • A health system analysing patient genomic data under a HIPAA business associate agreementnot Mendeley
  • A federal or federally funded project needing FedRAMP Moderate authorisation for its analysis environmentnot 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

Terra

  • The absence of a licence fee hides the real cost driver: an idle notebook virtual machine left running overnight, or a workspace bucket full of intermediate workflow outputs, quietly consumes grant money with no vendor invoice to prompt a review.
  • Cost governance is entirely the customer responsibility, and grant-funded groups without a cloud engineer routinely overspend before anyone reads the Google or Azure bill in enough detail to find the cause.
  • It assumes genuine bioinformatics competence: writing or adapting WDL workflows, managing data tables and debugging failed tasks are all on you, so a wet lab without computational staff cannot use it productively.
  • Feature parity between the Google Cloud and Azure deployments is not identical, so a decision on cloud provider constrains which capabilities and datasets you can reach and is expensive to reverse later.
  • It is a research platform rather than a regulated clinical system: it is not a validated GxP environment and does not carry the qualification package a diagnostic or submission workflow would require, so clinical use needs additional infrastructure and validation you provide 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

Terra

Free
  • Terra platformFree
    • No charge for the platform, administration, security controls or frontline support
    • Workspaces, workflow execution and notebook environments included
    • Available on Google Cloud and Microsoft Azure
  • Cloud consumption$undefined/month
    • Google Cloud or Azure charges passed through at cost with no markup
    • Running notebook virtual machines around 0.22 USD per hour, roughly 0.027 USD per hour when paused
    • Storage billed continuously on workspace buckets and intermediate workflow outputs

Which should you pick?

Choose Mendeley if

  • You want to start without paying.
Mendeley review

Choose Terra if

  • You need no platform licence fee.
  • You want to start without paying.
  • You work on Web, Google Cloud, Microsoft Azure.
  • You also want cloud pass-through billing.
Terra review

Questions people ask

Is Mendeley or Terra better?
Neither clearly leads. Mendeley starts at Free and Terra at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mendeley or Terra?
Mendeley starts at Free and Terra at Free.
Does Mendeley or Terra run on more platforms?
Mendeley runs on Web. Terra runs on Web, Google Cloud, Microsoft Azure.
Can I use Mendeley for free?
Both have a free tier, so you can try either at no cost before committing.
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 Terra is typically brought in for.
What can Mendeley do that Terra cannot?
Terra covers No platform licence fee, Cloud pass-through billing, WDL workflow execution, Notebook environments.

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
Terra: Is Terra really free?

The platform is. There is no licence fee. Everything you pay is Google Cloud or Azure compute, storage and egress, passed through at cost.

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
Terra: What actually drives the bill?

Running virtual machines and stored data. Pausing notebooks drops a virtual machine from about 0.22 to about 0.027 dollars an hour, and deleting intermediate workflow outputs is the other main saving.

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
Terra: Can I use it with protected health information?

Yes. Terra signs HIPAA business associate agreements and GDPR data processing agreements, and the Azure deployment holds FedRAMP Moderate authorisation.

Terra: Is it validated for clinical or GxP use?

No. It is a research platform. Regulated clinical or submission workflows need validation and controls you build yourself.

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