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Nonprofits · head to head

OneCause vs Tendenci

OneCause logo

OneCause

Nonprofits

Event management and auction fundraising platform, now part of Bonterra

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: OneCause no transparent pricing published; all plans require contacting sales at 888-475-5214 or online form for custom quotes; Tendenci self-hosting is a real operational commitment, and organisations without technical capacity should not treat the free licence as a free system
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which OneCause and Tendenci actually diverge.

Attributes where OneCause and Tendenci differ
AttributeOneCauseTendenci
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 OneCause

Nothing recorded that Tendenci does not also cover.

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.

OneCause

  • Managing ticketing, sponsorships, and registration for fundraising eventsnot Tendenci
  • Running silent and live auctions with mobile bidding capabilitiesnot Tendenci
  • Coordinating peer-to-peer fundraising campaigns like walks and runsnot Tendenci
  • Processing donations with gift matching and recurring contributionsnot Tendenci

Tendenci

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

Where each one falls short

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

OneCause

  • No transparent pricing published; all plans require contacting sales at 888-475-5214 or online form for custom quotes

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

OneCause

On request
  • Professional$undefined/mo
    • Foundational fundraising software
    • Ticketing, tables, sponsorships, auctions, donations
    • Suited for galas, luncheons, golf outings
  • Enterprise$undefined/mo
    • Large or multiple ticketed events
    • Event Ambassador Fundraising
    • Event Series
  • Nationals$undefined/mo
    • National organizations managing affiliate chapters
    • Organization Structure & Hierarchy
    • Event Templates

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 OneCause if

Nothing in the data separates OneCause from Tendenci on the points above - pick on price and on how each one feels to use.

OneCause 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 OneCause or Tendenci better?
Neither clearly leads. OneCause 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, OneCause or Tendenci?
Tendenci has a free tier; the other does not. Paid plans start at On request for OneCause and Free for Tendenci.
Does OneCause or Tendenci run on more platforms?
OneCause 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. OneCause starts at On request.
What is OneCause best used for?
OneCause is most often used for managing ticketing, sponsorships, and registration for fundraising events, running silent and live auctions with mobile bidding capabilities, coordinating peer-to-peer fundraising campaigns like walks and runs, processing donations with gift matching and recurring contributions. Of those, managing ticketing, sponsorships, and registration for fundraising events and running silent and live auctions with mobile bidding capabilities are not what Tendenci is typically brought in for.
What can OneCause do that Tendenci cannot?
Tendenci covers Open-source licence, Membership management, Events and registration, Donations.

Answered from the vendors’ own pages

OneCause: How much does OneCause cost?

OneCause does not publish pricing online. All plans require a custom quote. Contact OneCause at 888-475-5214 or submit a request through their website for pricing information.

Source
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.

OneCause: What pricing tiers does OneCause offer?

OneCause offers three main tiers: Professional (foundational fundraising software), Enterprise (large/multiple event management), and Nationals (national organizations with affiliate chapters). All require custom quotes.

Source
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.

OneCause: Is there a Pay As You Go option?

OneCause indicates Pay As You Go availability is offered within the Professional plan, but specific costs require contact with sales.

Source
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.

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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