The Fastest Way to Test APIs
Without the Bloat
Apier is a lightweight, browser-based API client for REST APIs, GraphQL, WebSocket, and Socket.IO. Built for fast developer workflows with privacy-first architecture and no unnecessary complexity.
Everything you need for modern API development.
Apier combines API testing, real-time communication, request organization, response inspection, and developer utilities into a single lightweight workspace.
REST API Testing
Send HTTP requests with headers, query parameters, authentication, and request bodies from a focused workspace.
GraphQL Workspace
Write queries, mutations, and variables while inspecting structured responses in a dedicated GraphQL editor.
WebSocket Client
Connect to WebSocket servers, exchange live messages, and inspect communication as it happens.
Socket.IO Client
Test Socket.IO events with a dedicated client for emitting, receiving, and debugging real-time connections.
Collections
Group related requests into reusable collections that keep projects organized and easy to navigate.
Folders
Structure large API projects with folders, making complex request hierarchies easier to manage.
Variables
Reuse dynamic values across requests to reduce repetition and simplify environment management.
Variable Collections
Manage multiple environments with grouped variables that can be shared across related requests.
Request History
Review previously executed requests, reopen them instantly, and continue testing without starting over.
Auto Runner
Execute requests repeatedly with configurable delays to automate testing and repetitive workflows.
Network Simulation
Evaluate API behavior under different network conditions to better understand response performance.
Response Viewer
Inspect response bodies, headers, status codes, timings, and other request details from one place.
Pretty, Raw & Tree Views
Switch between formatted, raw, and tree views to inspect responses in the way that fits your workflow.
Export Responses
Export API responses as JSON, XML, or TXT files for sharing, debugging, or documentation.
Code Generation
Generate cURL commands and reusable request snippets that integrate easily into your development workflow.
Themes & Appearance
Personalize the interface with themes and appearance options designed for comfortable everyday use.
Avatars
Customize your workspace with built-in avatars to create a more personal development experience.
Why developers choose Apier.
Built around practical workflows instead of unnecessary features, Apier stays focused on speed, organization, and privacy.
Lightweight
Built with a minimal footprint to keep startup fast, interactions responsive, and everyday API testing smooth.
Browser Native
Runs entirely in your browser without desktop software, giving you instant access from any modern environment.
Privacy First
Your requests, collections, variables, and history stay under your control without unnecessary data collection.
Runs Locally
Workspace data is stored locally in your browser, reducing external dependencies while keeping projects accessible.
No Accounts
Start testing APIs immediately without creating an account, signing in, or managing additional credentials.
Reusable Workflows
Organize collections, folders, variables, and request history into workflows that can be reused across projects.
Modern API Development
Everything is designed to keep requests organized, reusable, and easy to iterate on as your projects evolve.
Organize Requests
Build structured API projects using collections and folders that keep every request organized and easy to navigate.
Reuse Variables
Store reusable values in variables and variable collections to simplify environment-specific requests.
Review History
Reopen previously executed requests instantly, making it easy to continue testing without rebuilding workflows.
Automate Runs
Execute requests repeatedly with configurable delays to automate repetitive testing and validation tasks.
Simulate Networks
Evaluate API behavior under different network conditions to better understand performance and reliability.
Inspect Responses
Review responses using Pretty, Raw, and Tree views while examining headers, status codes, and response data.
Built for Every API Workflow
Work with REST APIs, GraphQL, WebSocket, and Socket.IO using dedicated workspaces designed for each protocol.
REST APIs
Send HTTP requests with support for methods, headers, query parameters, authentication, and request bodies.
GraphQL
Write queries, mutations, and variables while exploring GraphQL responses from a dedicated workspace.
WebSocket
Open persistent connections, exchange real-time messages, and inspect live communication with ease.
Socket.IO
Connect to Socket.IO servers, emit custom events, and monitor responses through a focused client.
Privacy by Design
Apier is designed to keep API development simple and private. Your workflow stays under your control without unnecessary services running in the background.
Everything Stays Local
Requests, collections, variables, and history remain inside your browser without relying on external servers.
No Accounts
Start testing immediately without creating an account, signing in, or managing additional credentials.
No Cloud Sync
Your workspace isn't automatically uploaded or synchronized, keeping project data under your control.
Browser First
Built to run directly in modern browsers with fast startup, minimal setup, and a familiar workflow.
No Tracking
No analytics, tracking scripts, or unnecessary background services are included in your workflow.
Minimal Permissions
Only the permissions required for the features you choose are requested, keeping the experience simple.
Everything You Need.
Nothing You Don't.
Test REST APIs, GraphQL, WebSocket, and Socket.IO from a fast, browser-native workspace built for everyday development.