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Databases · head to head

Apache Flink vs Corteza

Apache Flink logo

Apache Flink

Databases

Stateful stream processing at scale

From
Free
Free plan
Yes
Visit Apache FlinkFull review
Corteza logo

Corteza

No-Code

Apache-licensed open source low-code platform, formerly Crust, positioned against Salesforce

From
Free
Free plan
Yes
Visit CortezaFull review

The short version

  • Both are free.
  • Only Apache Flink lists event-time processing; only Corteza lists Corteza Low Code.
  • Where Apache Flink falls short: genuinely difficult: event time, watermarks and state backends are a real conceptual load before anything works.
  • Prices and features on this page were last checked on 31 August 2026.

Where they differ

Only the attributes on which Apache Flink and Corteza actually diverge.

Attributes where Apache Flink and Corteza differ
AttributeApache FlinkCorteza
Pricing modelOpen source, no licence fee; managed services billed separatelyOpen source, no licence fee
PlatformsLinux, Self-hostedWeb, Linux, Self-hosted
CategoryDatabasesNo-Code

Identical on both: starting price (Free), free tier (Yes).

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 Apache Flink

  • Event-time processing
  • Exactly-once state
  • Batch and stream
  • SQL interface

Only in Corteza

  • Corteza Low Code
  • Automation and workflow
  • Bundled CRM
  • Case management
  • Federation
  • Role-based access control
  • Corteza Messaging and integrations
  • Self-hosted deployment

What people use each for

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

Apache Flink

  • Real-time aggregations and dashboards computed over an event streamnot Corteza
  • Fraud and anomaly detection where patterns span a time windownot Corteza
  • Joining two live streams where events arrive out of ordernot Corteza

Corteza

  • A European public body that needs a case management system on servers inside its own jurisdiction with an auditable licence and no per-seat vendor feenot Apache Flink
  • An NGO replacing a Salesforce donation that has run out, needing to keep the data model but remove the recurring costnot Apache Flink
  • An integrator building a regulated vertical application it intends to resell, requiring a permissive licence it can ship commerciallynot Apache Flink
  • A mid-size European company that wants one platform for internal applications and a sales pipeline without paying per seat as headcount growsnot Apache Flink

Where each one falls short

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

Apache Flink

  • Genuinely difficult: event time, watermarks and state backends are a real conceptual load before anything works
  • Operationally heavy — job managers, task managers, checkpoint storage and state size are all yours to run and tune
  • State grows with the workload, and large state changes recovery time and cost significantly
  • Overkill where a scheduled batch job would answer the same question

Corteza

  • Planet Crust is a small company of roughly a dozen or so people, so the entire commercial support capability behind Corteza is thin and a large deployment can outgrow the vendors ability to respond
  • No pricing is published for Planet Crusts support, hosting or implementation services, so the true running cost of a supported deployment cannot be estimated without a sales conversation
  • The connector ecosystem is small compared with commercial low-code platforms, so integrations with common SaaS tools usually mean writing against the REST API rather than installing something
  • Hiring is hard: almost nobody has Corteza on a CV, so you are training internal developers on a niche platform and you cannot easily replace them
  • The bundled CRM is a starting point rather than a mature product, and teams that expect Salesforce-equivalent sales functionality out of the box will spend months building the gap themselves

Pricing, plan by plan

Apache Flink

Free
  • Apache FlinkFree
    • Full functionality
    • Self-hosted
    • No usage limits

Corteza

Free
  • Corteza communityFree
    • Apache 2.0 licensed with no feature gating
    • Low-code builder, workflow engine, CRM and case management included
    • Self-hosted on your own infrastructure
  • Planet Crust support and servicesOn request
    • Commercial support, hosting and implementation from Planet Crust
    • Custom application development
    • Training

Which should you pick?

Choose Apache Flink if

  • You need event-time processing.
  • You want to start without paying.
  • You work on Linux, Self-hosted.
  • You also want exactly-once state.
Apache Flink review

Choose Corteza if

  • You need corteza low code.
  • You want to start without paying.
  • You work on Web, Linux, Self-hosted.
  • You also want automation and workflow.
Corteza review

Questions people ask

Is Apache Flink or Corteza better?
Neither clearly leads. Apache Flink starts at Free and Corteza at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Apache Flink or Corteza?
Apache Flink starts at Free and Corteza at Free.
Does Apache Flink or Corteza run on more platforms?
Apache Flink runs on Linux, Self-hosted. Corteza runs on Web, Linux, Self-hosted.
Can I use Apache Flink for free?
Both have a free tier, so you can try either at no cost before committing.
What is Apache Flink best used for?
Apache Flink is most often used for real-time aggregations and dashboards computed over an event stream, fraud and anomaly detection where patterns span a time window, joining two live streams where events arrive out of order. Of those, real-time aggregations and dashboards computed over an event stream and fraud and anomaly detection where patterns span a time window are not what Corteza is typically brought in for.
What can Apache Flink do that Corteza cannot?
Apache Flink covers Event-time processing, Exactly-once state, Batch and stream, SQL interface. Corteza covers Corteza Low Code, Automation and workflow, Bundled CRM, Case management.

Answered from the vendors’ own pages

Apache Flink: Is Apache Flink free?

Yes, open source under the Apache Software Foundation. Managed services such as Amazon Managed Service for Apache Flink are billed separately.

Corteza: Is Corteza the same thing as Crust?

Yes. The project was branded Crust and renamed Corteza in 2019 when Crust Technology donated it to the Commons Conservancy.

Apache Flink: Flink or Kafka?

They are complementary rather than alternatives. Kafka moves and stores events; Flink computes over them with windowing, joins and durable state.

Corteza: Who owns the code?

The Commons Conservancy, a Dutch foundation. Planet Crust in Cork is the primary developer and sells commercial services around it.

Apache Flink: What is event-time processing?

Computing based on when an event actually occurred rather than when it arrived. It is what makes results correct when data is late or out of order, and it is the main reason Flink is harder than it looks.

Corteza: Is there a paid enterprise edition?

No. Corteza is Apache 2.0 with no feature gating. Planet Crust sells support, hosting and development instead of a restricted edition.

Corteza: Can it genuinely replace Salesforce?

For case management and a straightforward sales pipeline on a self-hosted footprint, yes. For a large sales organisation relying on AppExchange products and a mature ecosystem, no.

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