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Databases · head to head

Apache Flink vs Convoy

Apache Flink logo

Apache Flink

Databases

Stateful stream processing at scale

From
Free
Rated
-
Full reviewWebsite
Convoy logo

Convoy

APIs

Open source webhooks gateway you self-host, handling both sending and receiving

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Apache Flink genuinely difficult: event time, watermarks and state backends are a real conceptual load before anything works; Convoy the default deployment is self-hosted, so you operate Convoy plus Postgres and Redis and carry the on-call burden for the system that delivers your customers' events.
  • They diverge on capability: Apache Flink covers Event-time processing, Convoy covers Inbound and outbound.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

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

Attributes where Apache Flink and Convoy differ
AttributeApache FlinkConvoy
Pricing modelOpen source, no licence fee; managed services billed separatelyPer month, flat rate regardless of volume
PlatformsLinux, Kubernetes, Docker, Self-hostedLinux, Docker, Kubernetes, Cloud
CategoryDatabasesAPIs

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

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 Convoy

  • Inbound and outbound
  • Broker-driven ingestion
  • Payload transformation
  • Portal links
  • Circuit breaking
  • Retry policies
  • OpenTelemetry export
  • Role-based access control

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 Convoy
  • Fraud and anomaly detection where patterns span a time windownot Convoy
  • Joining two live streams where events arrive out of ordernot Convoy

Convoy

  • A fintech that cannot route customer webhook traffic through a third-party SaaS for compliance reasonsnot Apache Flink
  • A high-volume platform for which per-message webhook pricing costs more than the flat premium licencenot Apache Flink
  • A team that also receives webhooks from many providers and wants ingestion, verification and deduplication in the same gatewaynot Apache Flink
  • An engineering group that wants webhook delivery driven directly from an existing Kafka or SQS topicnot 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

Convoy

  • The default deployment is self-hosted, so you operate Convoy plus Postgres and Redis and carry the on-call burden for the system that delivers your customers' events.
  • Frain Technologies is a small startup, and putting customer-facing delivery infrastructure on it means accepting real vendor continuity risk on a component that is hard to swap out quickly.
  • The premium tier at a flat 999 US dollars a month is poor value below substantial volume, while the community edition omits the portal, transformations and RBAC that most production deployments end up wanting.
  • The hosted cloud trial is capped at one project and 100 events a day, which is too small to properly evaluate the service before committing.
  • Documentation and the third-party ecosystem are thinner than the established webhook services, so unusual configurations often mean reading the Go source.

Pricing, plan by plan

Apache Flink

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

Convoy

Free
  • CommunityFree
    • Self-hosted open source gateway
    • Inbound and outbound webhooks
    • Automatic retries and message broker support
  • Premium$999/month
    • Flat rate irrespective of message volume
    • Portal links and payload transformation
    • RBAC, circuit breaking and white labelling
  • Enterprise$undefined/year
    • SAML SSO
    • Dedicated support with SLA
    • On-premises deployment assistance
  • Cloud$undefined/month
    • Hosted by Convoy
    • 14 day trial limited to one project and 100 events a day
    • Usage-based tiers above the trial

Which should you pick?

Choose Apache Flink if

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

Choose Convoy if

  • You need inbound and outbound.
  • You want to start without paying.
  • You work on Linux, Docker, Kubernetes, Cloud.
  • You also want broker-driven ingestion.
Convoy review

Questions people ask

Is Apache Flink or Convoy better?
Neither clearly leads. Apache Flink starts at Free and Convoy at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Apache Flink or Convoy?
Apache Flink starts at Free and Convoy at Free.
Does Apache Flink or Convoy run on more platforms?
Apache Flink runs on Linux, Kubernetes, Docker, Self-hosted. Convoy runs on Linux, Docker, Kubernetes, Cloud.
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 Convoy is typically brought in for.
What can Apache Flink do that Convoy cannot?
Apache Flink covers Event-time processing, Exactly-once state, Batch and stream, SQL interface. Convoy covers Inbound and outbound, Broker-driven ingestion, Payload transformation, Portal links.

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.

Convoy: Is Convoy really open source?

Yes, the community edition is open source and self-hostable, covering both inbound and outbound webhooks with retries.

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.

Convoy: What does premium cost?

A flat 999 US dollars a month, self-hosted, regardless of message volume.

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.

Convoy: Does it receive webhooks as well as send them?

Yes, inbound ingestion with verification and deduplication is a first-class feature, unlike most webhook services.

Convoy: Do I have to self-host?

No, there is a hosted cloud, but the trial is capped at 100 events a day and self-hosting is the primary model.

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