How the "Open Core" Model Works 2026
How the "Open Core" Model Works: Free vs Paid Features
Most successful open source companies use the "open core" model. Here's how it works — what you get for free, what costs money, and why it's the dominant OSS business model.
What Is Open Core?
Open Core = Free open source product + Paid premium features/services
The core product is fully functional and open source. Premium features — typically enterprise needs — are proprietary and paid.
How Companies Split Free vs Paid
The Typical Split
| Free (Open Source) | Paid (Commercial) |
|---|---|
| Core functionality | SSO / SAML |
| Self-hosting | LDAP / AD integration |
| API access | Audit logs |
| Community support | Advanced permissions |
| Single-team use | Multi-team / org management |
| Basic integrations | Priority support |
| Standard auth | Custom branding / white-label |
| Data export | SLA guarantees |
| Managed cloud hosting |
Real Examples
Mattermost
| Free | Paid (Enterprise) |
|---|---|
| Unlimited users | SAML SSO |
| Unlimited messages | AD/LDAP groups sync |
| File sharing | Compliance exports |
| Integrations | Guest accounts |
| Custom branding | High availability |
| Mobile apps | Advanced permissions |
| Price: $0 | Price: $10/user/month |
Plane
| Free (Community) | Paid (Pro/Business) |
|---|---|
| Unlimited users | Advanced analytics |
| Issues, cycles, modules | Custom workflows |
| Pages (docs) | Intake forms |
| Custom properties | Advanced permissions |
| GitHub integration | Priority support |
| Price: $0 | Price: $4-9/user/month |
Supabase
| Free (Self-Hosted) | Paid (Cloud) |
|---|---|
| All features | Managed hosting |
| PostgreSQL | Auto-scaling |
| Auth | Branching |
| Storage | Point-in-time recovery |
| Realtime | SOC 2 compliance |
| Edge Functions | SLA |
| Price: $0 | Price: $25-599/month |
Cal.com
| Free (Self-Hosted) | Paid (Cloud) |
|---|---|
| All event types | Managed hosting |
| Booking pages | Teams management |
| Integrations | Round robin |
| API access | Routing forms |
| Custom branding | Cal.com atoms (embedded) |
| Price: $0 | Price: $12-37/user/month |
The Three Revenue Streams
1. Managed Cloud Hosting (60-70% of revenue)
Most customers pay for convenience, not features:
- No server management
- Automatic updates
- Automatic backups
- Support included
- SOC 2 / compliance certifications
Who pays: Teams without DevOps, startups wanting to move fast, enterprises needing compliance.
2. Enterprise Features (20-30% of revenue)
Features that only large organizations need:
- SSO / SAML (companies require it for security policies)
- LDAP / AD sync (syncing with existing identity providers)
- Audit logs (compliance and security tracking)
- Advanced permissions (fine-grained access control)
- SLA (guaranteed uptime and response times)
Who pays: Enterprises with 100+ users and compliance requirements.
3. Support and Services (5-10% of revenue)
- Priority support with response time guarantees
- Custom development and integrations
- Training and onboarding
- Migration assistance
Who pays: Large enterprises and government organizations.
Is Open Core Fair?
The Argument For
- Core product is genuinely free and useful
- Anyone can self-host with full functionality
- Enterprise features fund development of the free version
- Users benefit from the company having sustainable revenue
- The alternative is the project dying or going fully proprietary
The Argument Against
- "Feature gating" can be frustrating (SSO is a security feature, shouldn't be paid)
- Some companies put increasingly important features behind paywalls
- The line between "core" and "enterprise" is subjective
- Community contributions improve the paid product too
The SSO Debate
The most controversial open core decision: making SSO a paid feature.
Companies that gate SSO: Mattermost, GitLab, many others Argument: SSO is an enterprise compliance feature, not a core need Counter: SSO is a security feature that all organizations should have
Some projects (like Authentik, Keycloak) offer SSO as a core feature because authentication is their purpose. For tools where SSO is one of many features, it's typically enterprise-only.
Open Core vs Other Models
| Model | How It Works | Examples | Sustainability |
|---|---|---|---|
| Open Core | Free core + paid enterprise | Mattermost, GitLab, Supabase | High |
| SaaS Only | Hosted service, code may be open | Plausible, PostHog | High |
| Donations | Community-funded | Wikipedia, curl | Low-Medium |
| Support-Only | All code free, sell support | Red Hat (pre-IBM) | Medium |
| Dual License | AGPL free, commercial license paid | MySQL (pre-Oracle) | Medium |
| Foundation | Non-profit stewardship | Apache, Linux Foundation | High (for infra) |
Open core dominates because it aligns incentives: the company invests in the free product because it drives enterprise customers.
How to Evaluate Open Core Tools
Green Flags ✅
- Core product is fully functional for small/medium teams
- Enterprise features are genuinely enterprise-specific
- Active development on the free version
- Transparent about what's free vs paid
- Self-hosting documentation is maintained and current
- Community contributions are welcomed and merged
Yellow Flags ⚠️
- Important features moved from free to paid recently
- Self-hosting docs are outdated or hidden
- Cloud-only features that could work in self-hosted
- Community PRs ignored or slow to merge
Red Flags 🚩
- Core features being moved behind paywalls
- Self-hosting made deliberately harder
- License changes without community input
- Managed cloud is significantly better than self-hosted
- Company discourages self-hosting
The User's Decision Framework
| Your Situation | Best Option |
|---|---|
| Small team, has DevOps | Self-host free tier |
| Small team, no DevOps | Use managed cloud (paid) |
| Enterprise, compliance needs | Buy enterprise license |
| Evaluating the tool | Self-host free, then decide |
| Price-sensitive | Self-host, always |
Why the Open Core Model Matters in 2026
The open core model has become the dominant business model for enterprise open source precisely because it solved a problem that earlier models couldn't: how do you build a sustainable business around software that anyone can copy and use for free?
Donations failed at scale. Wikipedia survives on donations because it's a nonprofit institution with no commercial competition. Software companies facing AWS and Azure competing directly with their products can't depend on goodwill. The Linux Foundation and Apache Software Foundation work as foundations precisely because they don't compete with the companies using their software.
Support-only models worked for a generation of enterprise Linux companies (Red Hat, SUSE) but depend on the software being complex enough that enterprises will pay for expertise. Most modern SaaS alternatives aren't complex enough to justify large support contracts.
Open core aligns incentives in a way these other models don't. The company invests in the free product because a better free product drives more enterprise customers. The enterprise features fund the development of the free product. Users benefit from enterprise investment without paying enterprise prices. It's not a perfect model — the SSO tax is a real irritant — but it produces better outcomes than the alternatives.
The 2026 landscape makes understanding this model more important than ever. With hundreds of open source alternatives across every software category, the quality of the free tier varies enormously. Some projects give away 90% of their value for free (Supabase, Cal.com). Others provide just enough free functionality to get you hooked before paywalling essential features. Knowing how to distinguish between these requires understanding the model's incentive structure.
How to Evaluate the Free Tier of Any Open Core Tool
The free tier quality of an open core product reveals the company's relationship with its community. Projects that provide genuinely useful free functionality create trust that converts users into enterprise customers over time. Projects that use the free tier as a marketing funnel often see slower community growth and higher churn when users hit paywalls.
The most revealing test is deploying the tool for your actual use case at your actual scale and seeing what breaks or gets paywalled. Marketing copy about the free tier is less informative than hitting the limits yourself. A few specific things to probe:
Does SSO work without a paid license? For any tool used in a workplace context, SSO is a security baseline, not a premium feature. Products that gate SSO behind enterprise plans (a common practice called the "SSO tax") are making a statement about their relationship with users' security. Dedicated identity tools like Authentik and Keycloak provide SSO as a core function because authentication is their purpose — this is worth keeping in mind when evaluating your organization's AGPL licensing strategy, since AGPL tools often have more community pressure to keep security features free.
Is the self-hosting documentation maintained? Outdated self-hosting docs suggest the company's incentives are shifting toward their managed cloud offering. If the documentation was last updated a year ago and the product has shipped six releases since then, the company may be deliberately letting self-hosting become harder to maintain.
Are recent releases improving the free tier or mostly adding enterprise features? Release notes that consistently move features from "coming soon" into enterprise-only tiers, while the free tier stagnates, indicate a company extracting value from its community rather than investing in it.
For a broader framework on evaluating any open source tool before adopting it, see How to Evaluate Open Source Alternatives — the criteria there overlap significantly with open core evaluation but also cover project health, security posture, and operational readiness.
The Hidden Costs of the Wrong Open Core Choice
Choosing an open core tool where the free tier doesn't meet your needs creates a specific category of lock-in. Unlike SaaS lock-in (covered in The Hidden Costs of SaaS Vendor Lock-In), open core lock-in is subtler: you've invested in self-hosting infrastructure, team training, data migration, and integrations, only to discover that the features you actually need are behind an enterprise paywall.
The SSO scenario is the most common version of this trap. A team deploys an open core tool, gets dozens of users onboarded, and then discovers that connecting it to their existing identity provider requires an enterprise license. The switching cost now includes migrating all those users and their data to an alternative — which is often more expensive than simply paying the enterprise license.
The mitigation is evaluation first, deployment second. Before committing to any open core tool, map your actual requirements against the free tier explicitly. If SSO, audit logs, or advanced permissions are on your requirements list, verify they're available in the free tier or accept that you'll need to budget for enterprise licensing.
Understanding the state of the open source alternatives market — which segments have genuinely free tools vs. which rely heavily on open core paywalls — helps set realistic expectations. The State of Open Source Alternatives in 2026 provides context on which categories have the most competitive free options.
The Bottom Line
Open core works because it's a fair trade:
- For users: You get a genuinely useful, fully functional product for free. Self-host it, modify it, use it however you want.
- For companies: Enterprise customers fund development. The free product is marketing and community-building.
- For the ecosystem: Sustainable funding means the project keeps improving.
The key is evaluating whether the free tier is genuinely useful or just a demo. The best open core companies give you 90%+ of value for free — and that's exactly what makes their enterprise tier worth paying for.
Compare free vs paid features across all open source tools at OSSAlt.