OtterKit is a powerful desktop application for local development on macOS. It helps you create .localhost domains with automatic HTTPS, share your local server via public tunnels, test webhooks, and inspect HTTP traffic - all from one beautiful interface.

Is there a free trial?

Yes! OtterKit offers a 3-day free trial with full access to all features. No credit card required. After the trial, you can purchase a Pro license for $29/year to continue using OtterKit.

What operating systems does OtterKit support?

Currently, OtterKit is available for macOS 12.0 (Monterey) and later. We support both Apple Silicon (M1/M2/M3) and Intel-based Macs. Windows and Linux versions are on our roadmap.

How do .localhost domains work?

OtterKit acts as a local DNS resolver and reverse proxy. When you create a domain like myapp.localhost, OtterKit registers it with your system and routes all requests to your specified local port. This happens entirely on your machine with no external services.

Are the SSL certificates trusted by browsers?

Yes! When you trust OtterKit's Certificate Authority (CA), all certificates it generates are trusted by every browser on your machine. You'll see the green padlock just like on production sites.

How do public tunnels work?

Public tunnels create a secure connection between a public URL and your local server. When someone accesses the public URL, the request is securely forwarded to your machine. Tunnels are great for client demos, webhook testing, and mobile device testing.

Can I use OtterKit with any local server?

Absolutely! OtterKit works with any HTTP server running on your machine - Node.js, Python, Ruby, Go, PHP, or any other framework. Just point OtterKit to the port your server runs on.

Does OtterKit require an internet connection?

Local domains and HTTPS work completely offline. Public tunnels and CLI tunnels require an internet connection since they route traffic through external servers. The Traffic Inspector works regardless of internet connectivity.

Can AI agents use OtterKit?

Yes! The OtterKit CLI allows AI agents to provision tunnels programmatically with a single command. Agents pay per tunnel using MPP (Machine Payments Protocol) with USDC or pathUSD via Tempo Wallet or mppx. The CLI auto-detects which wallet is available. No desktop app installation required, just run npx otterkit tunnel .

How do daemon tunnels work?

Daemon tunnels run as background processes that survive terminal close. You pay a flat fee based on duration (1 minute to 24 hours). The tunnel auto-expires when the TTL runs out. Use npx otterkit status to check running daemons and npx otterkit stop to stop one.

How do CLI webhooks work?

The npx otterkit webhook command creates a webhook endpoint that captures incoming HTTP requests without needing a local server. You get a public URL that you can point any third-party service (Stripe, GitHub, Slack, etc.) to. All incoming requests are captured and displayed with full headers, body, and metadata. Webhooks use the same pricing as tunnels: $0.01 for foreground, TTL-based pricing for daemon mode.

Domains, tunnels, webhooks
in one beautiful app

Name: OtterKit
Rating: 4.9 (127 reviews)
Author: OtterKit

Create .localhost domains with HTTPS, share via tunnels, inspect traffic, and test webhooks. AI agents get instant tunnels with one command.

Buy for $29/year

100% Local. Everything runs on your machine.3-day free trial included. No credit card.Tunnels for AI agents from $0.01

Local DomainsAuto HTTPSPublic TunnelsWebhooksTraffic InspectorPort ManagerCertificatesAgent Tunnels

Features

Everything you need for local development

Stop juggling multiple tools. OtterKit brings all essential local development features into one elegant interface.

Local Domains

Create beautiful .localhost domains for your projects. No more remembering port numbers.

Auto HTTPS

Automatic SSL certificates with one-click trust. Get the green lock in your browser instantly.

Public Tunnels

Share your local server with anyone. Get a public URL in seconds, no configuration needed.

Webhook Testing

Create instant webhook endpoints. Capture, inspect, and replay incoming requests.

Traffic Inspector

Real-time HTTP traffic monitoring. See every request and response with full details.

Port Manager

See what processes are running on any port. Kill them instantly and save favorites.

Certificate Manager

Full control over your SSL certificates. Trust, regenerate, or export with ease.

CLI for Agents

Tunnels & webhooks for AI agents

One command to expose any local port or create a webhook endpoint. No desktop app, no sign-up. Pay per tunnel with USDC or pathUSD via Tempo Wallet or mppx. Auto-detects your wallet.

Terminal

$ npx otterkit tunnel 3000
Using Tempo Wallet (0x1e69...)
Initializing payment...
Provisioning tunnel...
Tunnel provisioned: agent-a1b2c3d4
  Tunnel ready: https://agent-a1b2c3d4.otterkit.app → localhost:3000
  Press Ctrl+C to disconnect
$ curl https://agent-a1b2c3d4.otterkit.app
  200 GET / (12ms)

Instant Setup

One command to expose any local port or create a webhook endpoint. No desktop app, no config files, no sign-up.

Pay Per Use

MPP payments with USDC or pathUSD via Tempo Wallet or mppx. From $0.01 per tunnel or webhook. Auto-detect or use --wallet flag.

Daemon Mode

Background tunnels and webhooks that survive terminal close. Auto-expire after TTL. From 1 minute to 24 hours.

Webhook Endpoints

Capture incoming HTTP requests without a local server. Point any service to your webhook URL.

Get started in 30 seconds:

curl -fsSL https://tempo.xyz/install | bash && npx otterkit tunnel 3000

Configuration needed

100%

Native performance

Built-in tools

Why OtterKit

Built for developers who value their time

OtterKit is designed to get out of your way and let you focus on what matters: building great software.

No configuration files to manage

Works with any local server

Native macOS performance

Beautiful, intuitive interface

Instant setup, zero dependencies

100% private - runs entirely on your machine

Pricing

Two ways to use OtterKit

A desktop app for your full local development workflow, or a CLI for instant agent tunnels and webhooks.

Desktop App

OtterKit Pro

Full local development toolkit for macOS

$29/year

3-day free trial

Unlimited local domains

Unlimited public tunnels

Unlimited webhooks

Auto HTTPS certificates

Traffic inspector

Port manager

Request replay

Priority support

All future updates

Subscribe - $29/year

Or start with a 3-day free trial

CLI for Agents

Pay Per Use

Instant tunnels and webhooks for AI agents via MPP

from$0.01/tunnel

ModeDurationPrice

ForegroundWhile terminal is open$0.01

1 minuteQuick test$0.01

1 hourDefault daemon$0.01

4 hoursExtended session$0.03

12 hoursHalf day$0.05

24 hoursFull day$0.08

No sign-up or subscription

Pay with USDC or pathUSD via Tempo mainnet

Tempo Wallet or mppx (auto-detected)

Works with any AI agent

Get Started with CLI

tempo wallet login

FAQ

Frequently Asked Questions

Everything you need to know about OtterKit.

Domains, tunnels, webhooksin one beautiful app

Everything you need for local development

Local Domains

Auto HTTPS

Public Tunnels

Webhook Testing

Traffic Inspector

Port Manager

Certificate Manager

Tunnels & webhooks for AI agents

Instant Setup

Pay Per Use

Daemon Mode

Webhook Endpoints

Built for developers who value their time

Two ways to use OtterKit

OtterKit Pro

Pay Per Use

Frequently Asked Questions

What is OtterKit?

Is there a free trial?

What operating systems does OtterKit support?

How do .localhost domains work?

Are the SSL certificates trusted by browsers?

How do public tunnels work?

Can I use OtterKit with any local server?

Does OtterKit require an internet connection?

Can AI agents use OtterKit?

How do daemon tunnels work?

How do CLI webhooks work?

Domains, tunnels, webhooks
in one beautiful app