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Technology · head to head

Close vs Swagger UI

Close logo

Close

Technology

The inside sales CRM of choice for startups & SMBs

From
$9/month
Free plan
No
Full reviewWebsite
Swagger UI logo

Swagger UI

Developer Tools

Interactive API documentation generated from OpenAPI specs

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only Swagger UI has a free tier, so it costs nothing to try first.
  • Each has a real cost: Close hidden costs beyond subscription: calling charges (~$0.02/minute), SMS usage fees, phone numbers ($1-5/month), AI call assistant ($50/month + $0.02/min transcription); Swagger UI only as good as the specification: a thin OpenAPI file produces thin documentation
  • They diverge on capability: Close covers Built-in calling, Swagger UI covers OpenAPI rendering.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where Close and Swagger UI differ
AttributeCloseSwagger UI
Starting price$9/monthFree
Pricing modelUnknownOpen source, no licence fee
Free tierNoYes
PlatformsWeb, iOS, AndroidWeb, Self-hosted, Docker
CategoryTechnologyDeveloper Tools
Founded2013Unknown

Identical on both: 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 Close

  • Built-in calling
  • Email automation
  • SMS messaging
  • Pipeline management
  • Lead management
  • Activity tracking
  • Reporting
  • Mobile app

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.

Close

  • Inside salesnot Swagger UI
  • Outbound salesnot Swagger UI
  • Lead managementnot Swagger UI
  • Sales engagementnot Swagger UI
  • Pipeline trackingnot Swagger UI

Swagger UI

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

Where each one falls short

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

Close

  • Hidden costs beyond subscription: calling charges (~$0.02/minute), SMS usage fees, phone numbers ($1-5/month), AI call assistant ($50/month + $0.02/min transcription)
  • No built-in lead lists, company intelligence, or contact enrichment; must source leads separately
  • Limited marketing automation compared to competitors like HubSpot; lacks lead scoring and nurturing campaigns
  • Calling cost at scale can double effective monthly cost for high-volume SDR teams making 50+ calls per day
  • Limited customization of data model compared to Salesforce; cannot create fully custom objects or complex relationships

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

Close

$9/month
  • Solo$9/month (annual)
    • 1 user only
    • 10,000 leads max
    • Calling, email, SMS
  • Essentials$35/month (annual)
    • Unlimited contacts
    • Team collaboration
    • 1,000 AI credits/month
  • Growth$99/month (annual)
    • Automation workflows
    • Power dialer
    • Bulk email
  • Scale$139/month (annual)
    • Role-based permissions
    • Predictive dialer
    • Unlimited recording

Swagger UI

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

Which should you pick?

Choose Close if

  • You need built-in calling.
  • You work on Web, iOS, Android.
  • You also want email automation.
Close 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 Close or Swagger UI better?
Neither clearly leads. Close starts at $9/month and Swagger UI at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Close or Swagger UI?
Swagger UI has a free tier; the other does not. Paid plans start at $9/month for Close and Free for Swagger UI.
Does Close or Swagger UI run on more platforms?
Close runs on Web, iOS, Android. Swagger UI runs on Web, Self-hosted, Docker.
Can I use Swagger UI for free?
Yes. Swagger UI has a free tier, so you can try it without paying. Close starts at $9/month.
What is Close best used for?
Close is most often used for inside sales, outbound sales, lead management, sales engagement. Of those, inside sales and outbound sales are not what Swagger UI is typically brought in for.
What can Close do that Swagger UI cannot?
Close covers Built-in calling, Email automation, SMS messaging, Pipeline management. Swagger UI covers OpenAPI rendering, Try it out, Schema display, Self-hostable.

Answered from the vendors’ own pages

Close: What are Close's pricing plans and what do they include?

Close offers four plans: Solo ($9-19/user/month), Essentials ($35-49), Growth ($99-109), and Scale ($139-149). All include calling, email, SMS, and Chloe AI agent access. Essentials adds unlimited contacts and team collaboration. Growth adds automation, power dialer, and custom activities. Scale adds role-based permissions and unlimited recording. Annual billing saves up to 50%.

Source
Swagger UI: Is Swagger UI free?

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

Close: What are the hidden costs in Close's pricing beyond the subscription?

Close charges usage-based fees for calling (~$0.02 per minute), SMS charges per message, and phone number rentals ($1-5/month). The AI Call Assistant add-on costs $50/month plus $0.02 per minute for transcription. Heavy outbound calling teams can see their total costs increase 30-50% beyond the base seat price.

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.

Close: What is Chloe, Close's AI sales agent, and what can it do?

Chloe is an AI sales agent built into Close that automatically calls leads, qualifies prospects through real conversations, and can book meetings while updating the CRM automatically. Chloe features AI-generated call summaries, transcripts, and action items automatically logged to contacts.

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.

Close: Does Close include lead lists, data enrichment, or contact information?

No. Close does not provide built-in lead lists, company intelligence, or contact enrichment features. Organizations must source leads separately or use third-party data providers. This differs from platforms like HubSpot which include integrated lead databases.

Source
Close: What communication features does Close include?

Close includes built-in calling with automatic call logging, email templates and bulk email capabilities, SMS messaging with tracking and automation, email syncing with Gmail, and automated follow-up workflows. All communication happens within the CRM platform.

Source
Close: Does Close have marketing automation capabilities?

Close's marketing automation features are limited compared to HubSpot. It includes basic email sequences, task reminders, and workflow automation, but lacks advanced lead scoring, nurturing campaigns, and detailed marketing analytics. Organizations requiring extensive marketing automation need separate tools.

Source
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