SpecialistAutonomous enterprise AI agents and CRM intelligence powered by Salesforce Data 360 and Atlas.

Klaviyo records 6,674,207 monthly visits with +6.1% month-over-month growth and Paid pricing. Postman records 1,764,877 monthly visits with -7.6% growth and Freemium pricing.

Design, test, and govern APIs — now with AI agents in the loop
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | klaviyo.com | postman.com |
| Pricing Model | Paid | Freemium |
| Monthly Visits | 6.67M (6,674,207) | 1.76M (1,764,877) |
| MoM Traffic Delta |
| +384.25K (+6.1%) |
| -144.52K (-7.6%) |
| Primary Market & Share | 🇺🇸 United States (38.7%) | 🇮🇳 India (22.9%) |
|---|
| Direct Visits / mo | 4.43M | 580.23K |
|---|
| User Rating | 4.6 | 4.7 |
|---|
| Supported Platforms | Website | Website |
|---|

The AI-powered B2C CRM for email, SMS, and personalized marketing at scale
Every contact, event, and channel feeds one profile so segmentation, personalization, and reporting stay consistent.
An agent that plans calendars, drafts campaigns, audits flows, and recommends next actions using your business context.
Build campaigns and automated flows across email, SMS, RCS, WhatsApp, push, and social from one interface.
Forecast lifetime value, churn risk, and expected next purchase date to target the right customers at the right time.

Design, test, and govern APIs — now with AI agents in the loop
A multi-protocol client with collections, environments, variables, and reusable requests that works for local debugging and for driving automated test suites.
Generates assertions automatically, supports data-driven runs with exported datasets, and executes tests locally, in the cloud, or from CI pipelines via the Postman CLI.
Agent Mode, the Postman CLI agent skills, and a Model Context Protocol server let coding assistants build collections, write tests, and trigger API workflows from inside the editor.
A structured, queryable map of an organization's APIs, collections, and dependencies that lets agents find the right service and understand what a schema change would break.
SpecialistAutonomous enterprise AI agents and CRM intelligence powered by Salesforce Data 360 and Atlas.

Broader general-purpose email marketing features, but less specialized ecommerce data segmentation compared to Klaviyo.

SpecialistIntegrates API testing and development directly inside your code editor, but lacks Postman's dedicated workspace collection management and documentation publishing.

Offers more integrated multi-channel tools like WhatsApp and live chat, but less advanced ecommerce predictive analytics.
SpecialistExcels at autonomous multi-file code generation and repository-wide understanding, but is not purpose-built for manual API endpoint testing.

Simpler and more affordable for basic newsletter design, but lacks advanced predictive segmentation and revenue analytics.

Free / Open-sourcePowerful visual workflow automation and API integration builder, but lacks Postman's granular API request inspection and documentation features.

Includes built-in landing page builders and webinars, but lacks Klaviyo's deep online store revenue attribution tracking.

Free / Open-sourceOpen-source control plane for orchestrating coding agents
SpecialistAutomates end-to-end testing using plain language agents, but lacks Postman's manual debugging and environment variable management tools.

SpecialistEmail marketing with AI send-time optimization to lift opens

Provides exceptionally powerful CRM automation workflows, but has a steeper learning curve for simple email campaigns.
SpecialistAutonomous enterprise AI agents and CRM intelligence powered by Salesforce Data 360 and Atlas.
Broader general-purpose email marketing features, but less specialized ecommerce data segmentation compared to Klaviyo.
SpecialistIntegrates API testing and development directly inside your code editor, but lacks Postman's dedicated workspace collection management and documentation publishing.
Offers more integrated multi-channel tools like WhatsApp and live chat, but less advanced ecommerce predictive analytics.
SpecialistExcels at autonomous multi-file code generation and repository-wide understanding, but is not purpose-built for manual API endpoint testing.
Simpler and more affordable for basic newsletter design, but lacks advanced predictive segmentation and revenue analytics.
Free / Open-sourcePowerful visual workflow automation and API integration builder, but lacks Postman's granular API request inspection and documentation features.
Includes built-in landing page builders and webinars, but lacks Klaviyo's deep online store revenue attribution tracking.
SpecialistEmail marketing with AI send-time optimization to lift opens
Provides exceptionally powerful CRM automation workflows, but has a steeper learning curve for simple email campaigns.