Best Forum Software in 2026
Short answer: Discourse is the best forum software in 2026 for most communities, free and open source to self-host with no user cap, or hosted from $100/mo (Pro). XenForo suits a large self-hosted forum built on a one-time license instead of a subscription, though check current pricing since its purchase page did not publish a figure. phpBB and Flarum are the best fully free options, both open source with no license fee. Invision Community bundles forums with blogs and events from $89/mo. Skip Khoros, Higher Logic Vanilla, and Higher Logic Thrive if a published price matters: none shows a dollar figure on its own site.
Ten forum and community platforms compared on self-hosting versus subscription pricing, free-tier limits, and moderation tools, with prices checked on vendor pages in September 2026.
Ask for "forum software" and the results blur three different products: classic threaded forums built for topic-and-reply discussion, chat-first platforms like Discord that added forum channels later, and enterprise community suites that wrap a forum inside a much bigger customer-engagement product. Which one fits depends on whether the buyer wants to self-host, pay a subscription, or pay a one-time license.
Discourse tops this list because its own site confirms the core software is 100% free and open source to self-host with no user cap, while a hosted plan on Discourse's own servers picks up the setup and maintenance work for a monthly fee. XenForo is the strongest self-hosted alternative for buyers who prefer a one-time license over a recurring subscription; check current pricing directly, since a figure did not appear on its own purchase page during this review. phpBB and Flarum carry no license fee at all, per each project's own site, the tradeoff for both is that hosting, setup, and maintenance are the buyer's job.
This guide is distinct from best community platforms, which covers courses-and-membership tools like Circle and Mighty Networks built around chat and content rather than threaded discussion. The two categories overlap at the edges (Circle appears on both lists), but a buyer specifically searching for threaded, search-first discussion software wants this ranking; a buyer building a paid membership community with courses wants the other one.
Toolradar data: of the 8 forum software tools we track, 63% offer a free or freemium plan, and 3 tools (38%) are paid-only. That paid-only share includes several names a buyer expects on a "best forum software" list, Khoros and Higher Logic among them, whose own pricing pages confirm no published figure and no self-serve signup.
How we chose: these 10 were checked against the 8 tools in that forum software category, every price and free-plan limit below was verified on the vendor's own site in September 2026, and the ranking carries no paid placement. See XenForo alternatives and Discourse vs XenForo for a closer look at the two leading self-hosted options.
Top Picks
Picked by editorial review, informed by G2 and Capterra review volume and rating and by media mentions, the signals behind our category rankings. How we rate
| Tool | Starting price | Rating | Best for |
|---|---|---|---|
| Discourse | Free self-hosted; $100/mo hosted (Pro) | 3.973 reviews | Most communities that want modern threaded discussion, self-hosted for free or hosted without server management. |
| XenForo | Check current pricing (license) | n/a | Long-running or large self-hosted forums that prefer a purchased license over a recurring subscription. |
| phpBB | Free, open source, self-hosted | 4.943 reviews | Budget-conscious communities with server access who want a proven, fully free forum platform. |
| Flarum | Free, open source, self-hosted | n/a | Developers who want a fast, modern self-hosted forum without phpBB's older interface. |
| Invision Community | From $89/mo (Creator, annual) | 4.035 reviews | Teams that want a forum plus blogs, downloads, and events on one hosted plan without managing a server. |
| Discord | Free to create and run a server | 3.7639 reviews | Communities that already live in real-time chat and want threaded forum channels alongside it. |
| Circle | From $89/mo (Professional, annual) | 4.2599 reviews | Creator and membership communities that want discussion spaces bundled with courses and events. |
| Higher Logic Vanilla | Check current pricing (quote only) | 4.399 reviews | Companies building a customer support or product-feedback community that expect a sales-led rollout. |
| Higher Logic Thrive | Check current pricing (quote only) | 4.4502 reviews | Associations and membership organizations that want a community bundled with marketing automation. |
| Khoros | Check current pricing (quote only) | 4.0131 reviews | Large enterprise brands that need a forum folded into a broader social and community suite. |
Most communities that want modern threaded discussion, self-hosted for free or hosted without server management.
Discourse's pricing is quite generous, especially with the free self-hosted option.
Long-running or large self-hosted forums that prefer a purchased license over a recurring subscription.
XenForo's pricing is fair for community builders who value full control and predictable costs.
Watch out
Cloud Business only includes 240GB data storage
Budget-conscious communities with server access who want a proven, fully free forum platform.
phpBB's pricing is exceptionally generous as it is completely free.
Developers who want a fast, modern self-hosted forum without phpBB's older interface.
Flarum's pricing is exceptionally fair and generous, as it is entirely free under an open-source license.
Teams that want a forum plus blogs, downloads, and events on one hosted plan without managing a server.
This makes it quite generous compared to many SaaS platforms.
Communities that already live in real-time chat and want threaded forum channels alongside it.
Discord is genuinely free for core communication, unlimited messages, voice channels, video calls up to 25 people, and communities of any size.
Watch out
File upload limits are tight on Free (10 MB), forces cloud storage workarounds for teams sharing assets
Creator and membership communities that want discussion spaces bundled with courses and events.
Circle's pricing is on the higher side compared to some community platforms, especially starting at $89/month for the Professional tier.
Watch out
Potential for higher fees on Enterprise tier (0.5% mentioned)
Companies building a customer support or product-feedback community that expect a sales-led rollout.
However, custom pricing often indicates a higher cost, likely placing it in the expensive range for smaller businesses or startups.
Associations and membership organizations that want a community bundled with marketing automation.
However, the lack of transparent pricing suggests it's likely on the more expensive side, targeting larger organizations rather than SMBs.
Watch out
Events Plus is an additional add-on.
Large enterprise brands that need a forum folded into a broader social and community suite.
This approach often leads to higher costs than publicly listed competitors, but can offer tailored solutions for large organizations.
Watch out
Implementation and onboarding fees
Other Forum Software worth considering
More published tools from our Forum Software category, ordered by our category ranking. They are not part of the editorial picks above.
What counts as forum software
Forum software organizes discussion into topics and replies that stay searchable indefinitely, the opposite of a chat app's scrolling stream. A post from three years ago should still surface in search and still carry context, that permanence is what separates a forum from a group chat.
Self-hosted and free describes phpBB and Flarum. Both ship as open source code a buyer installs on their own server, per each project's own site, with no license fee attached to the software itself.
Self-hosted or hosted, with a paid tier describes Discourse. Its core software is free and open source to self-host, confirmed on Discourse's own site, but a buyer who wants Discourse to run the servers pays a hosted plan instead (see the pricing table below).
Paid by license, not subscription describes XenForo, the commercial successor to vBulletin that many long-running forums migrated to. It is bought once rather than rented monthly, though check current pricing, since a figure was not available on its own purchase page at review time.
Hosted subscription, forum plus more describes Invision Community, which bundles forums with blogs, downloads, and event management on a single monthly plan, per the vendor's own pricing page (see the pricing table for the figure).
Chat-first, forums added later describes Discord, free to create and run a server, which added dedicated forum channels as a feature inside its existing chat product rather than building a forum-first tool.
Enterprise community suites with a forum inside describes Khoros, Higher Logic Vanilla, and Higher Logic Thrive, aimed at large brands and associations. None of the three publishes a price on its own site; every path leads to a demo request.
Why the hosting and pricing model decides the right fit
The choice between self-hosted and hosted forum software is really a choice about who carries the ongoing cost: a server bill and an admin's time, or a monthly invoice. phpBB and Flarum carry no license fee, per each project's own site, but a buyer still needs somewhere to run the code, security patches to apply, and backups to manage.
Discourse sits in the middle. The open source software itself is free to self-host, confirmed on Discourse's own site, yet most buyers who want to skip server management instead pay Discourse to host it on a Pro or Business plan (see the pricing table for both figures).
XenForo represents a third model that is increasingly rare in this category: a one-time license instead of a subscription. That structure matters for a long-running forum's total cost of ownership, a five-year-old XenForo install has not paid a single extra license fee since purchase, unlike a subscription tool. The tradeoff is that a buyer should confirm XenForo's current price directly, since its own purchase page did not display one during this guide's review.
Khoros, Higher Logic Vanilla, and Higher Logic Thrive show the opposite pattern from the free, self-hosted end of this market: all three are enterprise suites sold entirely through a sales conversation, per each vendor's own site, with no dollar figure published anywhere. A buyer chasing a specific number in that segment should expect a demo request before seeing one. The best helpdesk software guide covers the adjacent case of a support-first tool with forum-like self-service built in, useful when the real need is ticket deflection rather than open community discussion.
Key Features to Look For
Pricing model: subscription, license, or free (Essential)
Invision Community and Circle bill monthly subscriptions. XenForo sells a one-time license instead. phpBB and Flarum carry no license fee at all, confirmed on each project's own site.
Threading, search, and moderation depth (Essential)
Discourse's own site describes trust-level based moderation that grants privileges as members prove themselves over time, reducing manual moderation load compared with a flat permissions model.
Whether a real price is published at all (Important)
Khoros, Higher Logic Vanilla, and Higher Logic Thrive show no dollar figure on their own sites, only a demo request. XenForo's purchase page also displayed no figure at review time, check current pricing directly.
Staff and admin seat limits (Important)
Discourse's Pro plan includes 5 staff seats and Business includes 15, per Discourse's own pricing page, with member counts unlimited on both. Invision Community's Creator plan sets no limit on admin accounts, per its own site.
Bundled features beyond threaded discussion (Important)
Invision Community's Creator Plus tier ($149/mo, billed annually) adds courses and API access on top of the forum, per its own pricing page. Circle bundles spaces, events, and payments starting on its entry Professional plan.
Chat versus threaded-topic model (Nice to have)
Discord organizes conversation into channels and forum posts inside a real-time chat product, free to create and run, a different mental model from a search-first threaded forum like phpBB or Discourse.
SSO and enterprise controls (Nice to have)
Discourse Business ($500/mo) adds SSO with Open ID and OAuth2, per its own pricing page. Invision Community's Creator Plus tier adds custom SSO development as a listed feature.
What to decide before picking forum software
If the team wants zero server maintenance and can pay monthly, Discourse's hosted Pro plan and Invision Community's Creator plan are the two entry-level hosted options on this list (see the pricing table for both figures).
If the forum is expected to run for years, weigh XenForo's one-time license model against a subscription's compounding cost, but confirm XenForo's current price directly since its purchase page did not publish one at review time.
If the community lives inside real-time chat already, Discord's forum channels add threaded discussion to a free platform the members may already use daily.
If the buyer is a large brand or association expecting thousands of members and sales-led onboarding, Khoros, Higher Logic Vanilla, or Higher Logic Thrive fit, but budget for a sales process since none publishes a price.
Evaluation Checklist
On Discourse, decide self-hosted versus hosted before comparing cost: the software is free either way, only the hosted Pro and Business plans, per Discourse's own pricing page, add a recurring fee.
On XenForo, request current pricing directly, since its purchase page did not display a figure at this guide's review, and confirm whether the license covers one site or several.
On Invision Community, check which tier includes API access and custom SSO before assuming the entry Creator plan covers it, both sit on the higher Creator Plus tier per its own pricing page.
On Discord, confirm forum channels meet the moderation and search depth the community needs before assuming a chat-first tool works like a dedicated forum.
On Khoros, Higher Logic Vanilla, and Higher Logic Thrive, request pricing early in the evaluation, since none of the three vendor sites prints a number, and factor in the sales cycle before committing evaluation time.
Pricing Overview
Free, self-hosted, open source
$0 (hosting costs extra)
Hosted, entry subscription
Discourse's hosted Pro plan and Invision Community's Creator plan, both requiring no server setup and both billed monthly, confirmed on each vendor's own pricing page.
From $100/mo
Hosted, growth subscription
Discourse Business, Invision Community's Creator Plus and Professional tiers, and Circle's Business and Scale plans, for larger or more active communities.
$149 to $500/mo
One-time self-hosted license
XenForo, sold as a purchased license rather than a subscription; its purchase page did not publish a figure at this guide's review.
Check current pricing
Quote-only enterprise
Khoros, Higher Logic Vanilla, and Higher Logic Thrive, none of which publishes a price on its own site.
Contact sales
Pricing Comparison
| Tool | Best for | Entry price | Free plan or self-hosted | Currency note |
|---|---|---|---|---|
Discourse | Modern threaded discussion, self-hosted or hosted | $100/mo (Pro, hosted, 5 staff seats) | Yes, free and open source to self-host | USD confirmed on Discourse's own pricing page |
A one-time-license self-hosted forum for long-running sites | Check current pricing | Self-hosted only, license purchase | No USD figure rendered on XenForo's own purchase page at review time | |
A fully free, classic self-hosted forum | $0, no license fee | Yes, free and open source | No pricing page exists, the project has no paid tier | |
Flarum | A fully free, modern lightweight self-hosted forum | $0, no license fee | Yes, free and open source | No pricing page exists, the project has no paid tier |
A hosted forum bundled with blogs and events | $89/mo (Creator, billed annually) | No permanent free plan, free trial only | USD confirmed on Invision Community's own pricing page | |
B2B and B2C customer support communities | Check current pricing (quote only) | No, demo required | No USD figure published on Higher Logic's own Vanilla packages page | |
Discord | Chat-first communities that also want forum channels | $0, free to create and run a server | Yes, free with an optional paid Nitro add-on | No cost confirmed on Discord's own site to create or join a server |
Circle | Creator and membership communities with forum-like spaces | $89/mo (Professional, billed annually) | No permanent free plan | USD confirmed on Circle's own pricing page |
Khoros | Large enterprise brand communities | Check current pricing (quote only) | No, demo required | No USD figure published on Khoros's own pricing page |
Association member engagement communities | Check current pricing (quote only) | No, demo required | No USD figure published on Higher Logic's own Thrive packages page |
Checked on vendor sites on September 25, 2026: Discourse pricing, XenForo purchase, phpBB, Flarum, Invision Community pricing, Higher Logic Vanilla packages, Discord, Circle pricing, Khoros pricing, Higher Logic Thrive packages.
XenForo's own purchase page returned no public figure at the time of this review; confirm current pricing directly before budgeting. Higher Logic Vanilla, Higher Logic Thrive, and Khoros each route every plan to a demo request, per their own sites, with no dollar figure published anywhere.
For the broader courses-and-membership category, see best community platforms. For a support-first alternative, see best helpdesk software and best knowledge base software.
Mistakes to Avoid
- ×
- ×
Confusing Higher Logic Vanilla with Higher Logic Thrive. They are separate products under one parent company, per Higher Logic's own site, Vanilla for B2B and B2C customer communities, Thrive for association member engagement.
- ×
Budgeting for XenForo's price from memory or an old article. Its own purchase page did not publish a figure at this guide's review; confirm the current price directly before committing.
- ×
Expecting Khoros, Higher Logic Vanilla, or Higher Logic Thrive to publish a starting price. All three vendors' own sites route every plan to a demo request, a buyer should expect a sales conversation, not a self-serve signup.
- ×
Treating Discord's forum channels as equivalent to a dedicated forum's search and moderation depth. It was built chat-first, per Discord's own site, and added forum channels later as one feature among many.
Expert Tips
- →
- →
Ask XenForo for a written price before assuming its one-time license beats a subscription over five years. Its own purchase page did not publish a figure at this guide's review, so the comparison needs a real number first.
- →
Confirm which Higher Logic product a demo is quoting. Vanilla and Thrive serve different buyers, per Higher Logic's own site, and a quote for one does not apply to the other.
- →
Test Discourse's trust-level moderation on a small pilot before rolling it out fully. Privileges scale automatically as members prove themselves, per Discourse's own site, which can surprise an admin used to flat permissions.
- →
Use Invision Community's Creator plan to test the platform before assuming API access and custom SSO are included. Both sit on the higher Creator Plus tier at $149/mo billed annually, confirmed on its own pricing page.
- →
Check back on XenForo and the Higher Logic products periodically. Vendors that route every plan to a sales conversation or leave a purchase page unrendered sometimes change that within months.
Red Flags to Watch For
- !
A vendor pricing page with no dollar figure anywhere. Khoros's own pricing page shows product descriptions with no tier names or numbers, only a demo request.
- !
- !
A one-time license quoted without confirming what it covers. XenForo's purchase page did not publish a figure at review time; confirm directly whether it is per-site, includes a support period, or requires a renewal for updates.
- !
- !
Two products from the same company assumed to be the same tool. Higher Logic Vanilla (B2B and B2C customer communities) and Higher Logic Thrive (association member engagement) are separate products under one parent, per Higher Logic's own site, with different feature sets.
The Bottom Line
Choose Discourse when the goal is modern threaded discussion with the option to self-host for free or pay to skip server management on its hosted plan. It is the strongest all-around pick for most communities, per its own pricing page. Choose XenForo when a one-time license beats a subscription for a long-running, large self-hosted forum, but confirm its current price directly since the purchase page did not publish one at this guide's review.
Choose phpBB or Flarum when the budget is $0 and server access is available, both are fully open source with no license fee, per each project's own site. Choose Invision Community or Circle when a hosted plan bundling forums with blogs, courses, or events matters more than the lowest possible cost, both bill their entry tier annually (see the pricing table for the figures). Choose Discord when the community already lives in real-time chat and forum channels are a bonus, not the primary need.
Skip Khoros, Higher Logic Vanilla, and Higher Logic Thrive unless the organization is a large enterprise brand or association ready for a sales-led rollout, none of the three publishes a price.
Cite this: Toolradar, "Best Forum Software in 2026", September 2026. Prices verified on vendor pages in September 2026. No paid placement. Compared with the 8 forum software tools we track.
Frequently Asked Questions
What is the best forum software in 2026?
Discourse, because its core software is free and open source to self-host with no user cap, per Discourse's own site, while a hosted Pro plan on Discourse's own servers handles server management for a monthly fee (see the pricing table).
XenForo is the strongest pick for a large or long-running forum that prefers a one-time license over a subscription, though its price was not published at this guide's review. phpBB and Flarum are the best fully free choices for a buyer with server access and a $0 budget.
How much does forum software cost in 2026?
Verified on vendor pages in September 2026, prices split four ways. phpBB and Flarum carry no license fee at all. Discourse's hosted plans run $100/mo (Pro) to $500/mo (Business), with Enterprise custom. Invision Community and Circle each publish a real entry price billed annually too, see the pricing table above for both figures. XenForo sells a one-time license with no current figure published on its own purchase page. Khoros, Higher Logic Vanilla, and Higher Logic Thrive publish no price at all, every plan routes to a demo request.
Is there free forum software?
Yes. phpBB and Flarum are both fully open source with no license fee, confirmed on each project's own site, the only cost is hosting the server they run on. Discourse's core software is free to self-host too, though most buyers who want Discourse to handle hosting pay for its hosted Pro plan instead. Discord is also free to create and run a server, with forum channels included at no cost.
Discourse vs XenForo: which should I buy?
Discourse fits a buyer who wants modern threaded discussion with a choice between free self-hosting and a paid hosted plan, per Discourse's own pricing page. XenForo fits a buyer who prefers a one-time license over any recurring subscription, especially for a forum expected to run for years, though its purchase page did not publish a current figure at this guide's review, so confirm pricing directly. Both are self-hostable; the real difference is Discourse's hosted option versus XenForo's purchase-once model. See Discourse vs XenForo for a closer feature-by-feature look.
Is Discord good forum software?
It works for communities that already live in real-time chat and want threaded forum channels alongside voice and text, free to create and run, confirmed on Discord's own site. It is a weaker fit than Discourse or phpBB for a community that needs deep search, permanent topic archives, or granular moderation, since Discord was built chat-first and added forum channels as one feature among many.
Which forum software has no published price?
Khoros, Higher Logic Vanilla, and Higher Logic Thrive all route every plan to a demo request, per each vendor's own site, with no dollar figure published anywhere. XenForo's own purchase page also showed no public price at the time of this guide's review, check current pricing directly, though it is sold as a one-time license rather than a quote-only enterprise product.
What is the difference between Higher Logic Vanilla and Higher Logic Thrive?
Both are Higher Logic products, but they serve different buyers, per Higher Logic's own site. Vanilla targets B2B and B2C customer communities built around case deflection, customer retention, and product feedback. Thrive targets associations and membership organizations, bundling a private community with marketing automation and AMS integrations. Neither publishes a price; both route to a demo request.
Cite this page: Toolradar, "Best Forum Software in 2026", updated September 2026, https://toolradar.com/guides/best-forum-software
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