Is PubNub or Stainless better?

Neither clearly leads. PubNub starts at Free and Stainless at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, PubNub or Stainless?

PubNub starts at Free and Stainless at Free.

Does PubNub or Stainless run on more platforms?

PubNub runs on web, ios, android, api. Stainless runs on web, api.

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 Stainless is typically brought in for.

What can PubNub do that Stainless cannot?

PubNub covers Pub/sub messaging, Presence tracking, Message persistence, Serverless Functions. Stainless covers SDK generation, MCP server generation, Docs site generation, Webhooks and streaming support.

API Management · head to head

PubNub vs Stainless

PubNub

API Management

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

From: Free
Rated: -

Full review Website

Stainless

API Management

Generates client SDKs, API docs, and MCP servers from an OpenAPI spec

From: Free
Rated: -

Full review Website

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.; Stainless starter and Pro plan prices are not published and require contacting the company.
They diverge on capability: PubNub covers Pub/sub messaging, Stainless covers SDK generation.

Where they differ

Only the attributes on which PubNub and Stainless actually diverge.

Attributes where PubNub and Stainless differ
Attribute	PubNub	Stainless
Platforms	web, ios, android, api	web, api

Identical on both: starting price (Free), pricing model (freemium), free tier (Yes), user rating (Not yet rated), category (API Management).

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 Stainless

SDK generation
MCP server generation
Docs site generation
Webhooks and streaming support
Automated unit tests
Git integration

What people use each for

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

PubNub

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

Stainless

Generating typed SDKs for a public APInot PubNub
Producing an MCP server from an existing OpenAPI specnot PubNub
Building an API documentation site alongside client librariesnot PubNub
Giving open-source APIs a free SDK generation pathnot 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.

Stainless

Starter and Pro plan prices are not published and require contacting the company.
The free plan caps APIs at 25 endpoints, which excludes larger production APIs.
Overage charges apply per SDK/endpoint/month once limits are exceeded, which can make costs unpredictable at scale.

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

Stainless

Free

FreeFree
- Up to 5 generators (SDKs, docs, or MCP servers)
- 5 seats
- APIs with 25 or fewer endpoints
Starter$undefined/mo
- Unlimited generators
- Expanded seats
- Private SDKs of any size
Pro$undefined/mo
- Custom enterprise features and pricing
Enterprise$undefined/mo
- Dedicated support
- SOC 2 compliance reports
- Purchase order/invoicing with negotiable terms

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 Stainless if

You need sdk generation.
You want to start without paying.
You work on web, api.
You also want mcp server generation.

Stainless review

Questions people ask

Is PubNub or Stainless better?: Neither clearly leads. PubNub starts at Free and Stainless at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PubNub or Stainless?: PubNub starts at Free and Stainless at Free.
Does PubNub or Stainless run on more platforms?: PubNub runs on web, ios, android, api. Stainless runs on web, api.
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 Stainless is typically brought in for.
What can PubNub do that Stainless cannot?: PubNub covers Pub/sub messaging, Presence tracking, Message persistence, Serverless Functions. Stainless covers SDK generation, MCP server generation, Docs site generation, Webhooks and streaming support.

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

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

Yes. The Free plan supports up to 5 generators, 5 seats, APIs with 25 or fewer endpoints, and 100 preview builds per month, with email support.

Source

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

Stainless: Who owns the generated SDK code?

The generated SDK code is owned by the customer and published by Stainless under the Apache 2.0 license.

Source

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

Stainless: What happens if I exceed my plan's endpoint limit?

Customers exceeding their endpoint limits are billed per SDK, per endpoint, per month for the overage.

Source

PubNub vs Stainless

PubNub

Stainless

The short version

Where they differ

What each one covers

Only in PubNub

Only in Stainless

What people use each for

PubNub

Stainless

Where each one falls short

PubNub

Stainless

Pricing, plan by plan

PubNub

Stainless

Which should you pick?

Choose PubNub if

Choose Stainless if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on PubNub

More on Stainless

Keep looking

Other head to heads