Softwr

APIs · head to head

PubNub vs Swagger UI

PubNub logo

PubNub

APIs

Realtime communication platform for chat, IoT, and live data apps

From
Free
Rated
-
Full reviewWebsite
Swagger UI logo

Swagger UI

Developer Tools

Interactive API documentation generated from OpenAPI specs

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: PubNub free plan storage history is limited to 7 days, which is short for apps needing longer message retention.; Swagger UI only as good as the specification: a thin OpenAPI file produces thin documentation
  • They diverge on capability: PubNub covers Pub/sub messaging, Swagger UI covers OpenAPI rendering.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which PubNub and Swagger UI actually diverge.

Attributes where PubNub and Swagger UI differ
AttributePubNubSwagger UI
Pricing modelfreemiumOpen source, no licence fee
Platformsweb, ios, android, apiWeb, Self-hosted, Docker
CategoryAPIsDeveloper Tools

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 PubNub

  • Pub/sub messaging
  • Presence tracking
  • Message persistence
  • Serverless Functions
  • File sharing
  • Encryption and access controls

Only in Swagger UI

  • OpenAPI rendering
  • Try it out
  • Schema display
  • Self-hostable

What people use each for

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

PubNub

  • Building realtime chat applicationsnot Swagger UI
  • Streaming live IoT sensor datanot Swagger UI
  • Adding presence indicators to collaborative appsnot Swagger UI
  • Running edge logic with serverless Functions on realtime eventsnot Swagger UI

Swagger UI

  • Publishing API documentation that stays in step with the specificationnot PubNub
  • Letting developers try endpoints before writing any client codenot PubNub
  • Internal API discovery across teamsnot PubNub

Where each one falls short

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

PubNub

  • Free plan storage history is limited to 7 days, which is short for apps needing longer message retention.
  • MAU-based pricing means costs scale directly with user growth, which can be less predictable than flat message-based pricing.
  • Pro-tier custom pricing above 50,000 MAU requires contacting sales rather than self-serve checkout.

Swagger UI

  • Only as good as the specification: a thin OpenAPI file produces thin documentation
  • Default presentation is dated compared with modern documentation tools
  • Large specifications render slowly and become hard to navigate
  • Try it out against production needs care with authentication and CORS, and is often disabled as a result

Pricing, plan by plan

PubNub

Free
  • FreeFree
    • Up to 200 MAU or 1M transactions
    • 1GB data storage (7 days)
    • 5 test Serverless Functions
  • Starter$98/month
    • 1,000 MAU included
    • User management
    • Insights
  • Pro$undefined/month
    • Custom MAU packages
    • Volume discounts
    • Enterprise-scale configurations

Swagger UI

Free
  • Swagger UIFree
    • Full functionality
    • Commercial use permitted
    • Community support

Which should you pick?

Choose PubNub if

  • You need pub/sub messaging.
  • You want to start without paying.
  • You work on web, ios, android, api.
  • You also want presence tracking.
PubNub review

Choose Swagger UI if

  • You need openapi rendering.
  • You want to start without paying.
  • You work on Web, Self-hosted, Docker.
  • You also want try it out.
Swagger UI review

Questions people ask

Is PubNub or Swagger UI better?
Neither clearly leads. PubNub starts at Free and Swagger UI at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PubNub or Swagger UI?
PubNub starts at Free and Swagger UI at Free.
Does PubNub or Swagger UI run on more platforms?
PubNub runs on web, ios, android, api. Swagger UI runs on Web, Self-hosted, Docker.
Can I use PubNub for free?
Both have a free tier, so you can try either at no cost before committing.
What is PubNub best used for?
PubNub is most often used for building realtime chat applications, streaming live iot sensor data, adding presence indicators to collaborative apps, running edge logic with serverless functions on realtime events. Of those, building realtime chat applications and streaming live iot sensor data are not what Swagger UI is typically brought in for.
What can PubNub do that Swagger UI cannot?
PubNub covers Pub/sub messaging, Presence tracking, Message persistence, Serverless Functions. Swagger UI covers OpenAPI rendering, Try it out, Schema display, Self-hostable.

Answered from the vendors’ own pages

PubNub: What does PubNub cost?

PubNub offers a free plan for up to 200 MAU or 1 million transactions, a Starter plan at $98/month for 1,000 MAU, and custom Pro pricing for larger volumes, e.g. around $550/month for 10,000 MAU.

Source
Swagger UI: Is Swagger UI free?

Yes, open source under the Apache 2.0 licence. SmartBear sells commercial SwaggerHub separately.

PubNub: Is there a free plan, and what are its limits?

Yes, the free plan supports up to 200 monthly active users or 1 million transactions, includes 1GB of data storage retained for 7 days, and requires no credit card.

Source
Swagger UI: What is the difference between Swagger and OpenAPI?

OpenAPI is the specification format; Swagger is the toolset around it, including Swagger UI. The specification was renamed from Swagger to OpenAPI in 2016.

PubNub: How is usage metered?

PubNub bills primarily by Monthly Active Users, defined as a unique user who connects at least once in a billing cycle; messages are bundled into MAU pricing with no separate per-message fees, and overage is billed proportionally.

Source
Swagger UI: Can Swagger UI make real API calls?

Yes, through its try-it-out control, though authentication and CORS configuration often mean it is disabled for production APIs.

Share

Related pages

More on PubNub

More on Swagger UI

Keep looking

Other head to heads