Softwr

Nonprofits · head to head

Fluxx vs Tendenci

Fluxx logo

Fluxx

Nonprofits

Configurable grants management for foundations that run complex, multi-stage funding programmes

From
On request
Rated
-
Full reviewWebsite
Tendenci logo

Tendenci

Nonprofits

Open-source association management system for nonprofits

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Tendenci has a free tier, so it costs nothing to try first.
  • Each has a real cost: Fluxx configuration flexibility means the system does very little until someone configures it, and foundations without a dedicated systems administrator end up paying the vendor or a partner for every change.; Tendenci self-hosting is a real operational commitment, and organisations without technical capacity should not treat the free licence as a free system
  • They diverge on capability: Fluxx covers Configurable data model, Tendenci covers Open-source licence.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Fluxx and Tendenci actually diverge.

Attributes where Fluxx and Tendenci differ
AttributeFluxxTendenci
Starting priceOn requestFree
Pricing modelquoteOpen source, with paid hosting available
Free tierNoYes
PlatformsWebWeb, Linux, Self-hosted, Cloud

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

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 Fluxx

  • Configurable data model
  • Card-based interface
  • Multi-programme workflows
  • Board and committee review
  • Payment scheduling
  • Applicant portal

Only in Tendenci

  • Open-source licence
  • Membership management
  • Events and registration
  • Donations
  • Content-managed website
  • Email

What people use each for

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

Fluxx

  • A foundation running six distinct funding programmes that each need their own application form, review panel and payment schedulenot Tendenci
  • A regranting intermediary administering funds for multiple donors who each require separate reportingnot Tendenci
  • A public agency distributing grant funds with statutory eligibility rules that must be enforced before an application can be submittednot Tendenci
  • A funder moving off spreadsheets and email after grant volume made manual board packet preparation unworkablenot Tendenci

Tendenci

  • Nonprofits whose boards require member and donor data to stay under their own controlnot Fluxx
  • Organisations with data residency obligations a hosted platform cannot satisfynot Fluxx
  • Groups with technical capacity wanting to avoid per-member subscription costs at scalenot Fluxx
  • Associations needing to customise workflows beyond what a proprietary platform allowsnot Fluxx

Where each one falls short

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

Fluxx

  • Configuration flexibility means the system does very little until someone configures it, and foundations without a dedicated systems administrator end up paying the vendor or a partner for every change.
  • Implementation commonly runs four to eight months and is priced separately from the subscription, so first-year cost is far above the annual licence figure.
  • No pricing is published and quotes scale with assets under management, which means two foundations making the same number of grants can be quoted very differently.
  • The card-based interface is unfamiliar to new users and reviewer adoption suffers without training, which matters because trustees use it a few times a year and forget between meetings.
  • Reporting is capable but the report builder is technical, and many foundations end up exporting to a spreadsheet or a BI tool for board-ready output.

Tendenci

  • Self-hosting is a real operational commitment, and organisations without technical capacity should not treat the free licence as a free system
  • The community is small compared with mainstream open-source projects, so answers are harder to find and contributors are few
  • The interface is dated against the commercial association platforms and this is the most common user complaint
  • Fewer integrations than commercial competitors, and building them is a development task rather than a configuration one
  • Feature depth in events and continuing education is behind the specialist commercial systems

Pricing, plan by plan

Fluxx

On request
  • Fluxx Grantmaker$undefined/year
    • Configurable grantmaking workflows
    • Applicant portal and reviewer access
    • Priced by assets under management and grant volume
  • Fluxx Grantseeker$undefined/year
    • Free portal for applicants submitting to Fluxx funders
    • Tracks submissions and requirements across funders

Tendenci

Free
  • Self-hostedFree
    • Full source code
    • No per-member licence
    • Community support
  • Managed hosting$undefined/month
    • Hosted and maintained
    • Updates applied
    • Support included

Which should you pick?

Choose Fluxx if

  • You need configurable data model.
  • You also want card-based interface.
Fluxx review

Choose Tendenci if

  • You need open-source licence.
  • You want to start without paying.
  • You work on Web, Linux, Self-hosted, Cloud.
  • You also want membership management.
Tendenci review

Questions people ask

Is Fluxx or Tendenci better?
Neither clearly leads. Fluxx starts at On request and Tendenci at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fluxx or Tendenci?
Tendenci has a free tier; the other does not. Paid plans start at On request for Fluxx and Free for Tendenci.
Does Fluxx or Tendenci run on more platforms?
Fluxx runs on Web. Tendenci runs on Web, Linux, Self-hosted, Cloud.
Can I use Tendenci for free?
Yes. Tendenci has a free tier, so you can try it without paying. Fluxx starts at On request.
What is Fluxx best used for?
Fluxx is most often used for a foundation running six distinct funding programmes that each need their own application form, review panel and payment schedule, a regranting intermediary administering funds for multiple donors who each require separate reporting, a public agency distributing grant funds with statutory eligibility rules that must be enforced before an application can be submitted, a funder moving off spreadsheets and email after grant volume made manual board packet preparation unworkable. Of those, a foundation running six distinct funding programmes that each need their own application form, review panel and payment schedule and a regranting intermediary administering funds for multiple donors who each require separate reporting are not what Tendenci is typically brought in for.
What can Fluxx do that Tendenci cannot?
Fluxx covers Configurable data model, Card-based interface, Multi-programme workflows, Board and committee review. Tendenci covers Open-source licence, Membership management, Events and registration, Donations.

Answered from the vendors’ own pages

Fluxx: Is Fluxx Grantseeker really free?

Yes, for applicants. It is the submission portal, and funders pay for Grantmaker.

Tendenci: Is Tendenci really free?

The software is, under an open-source licence with no per-member fee. Running it is not: hosting, updates, backups and security are the organisation responsibility unless managed hosting is purchased.

Fluxx: How is Fluxx priced?

By quote, scaling with assets under management and grant volume. Implementation is a separate professional services fee.

Tendenci: Who should choose it?

Organisations with a genuine requirement to control their own data, and the technical capacity to act on it. Choosing it purely to avoid subscription cost usually ends badly.

Fluxx: Can we configure Fluxx ourselves?

Yes, that is the point of it. But it requires a trained internal administrator; foundations that do not appoint one become dependent on paid services.

Tendenci: Can I move my data out?

Yes, entirely. That is the point. Data lives in a PostgreSQL database you control, and there is no vendor holding it.

Fluxx: How long does implementation take?

Typically four to eight months for a multi-programme funder, driven mostly by how long the foundation takes to agree its own process.

Tendenci: How does it compare to Wild Apricot?

Wild Apricot is easier, better supported and better looking. Tendenci is the answer when data ownership is a requirement rather than a preference.

Tendenci: Is it actively maintained?

It is developed openly on GitHub with a small team and community. Check recent commit activity before committing, as with any small open-source project.

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