Open-source API mock server for multiple protocols
A GNS3-style editor for containers, VMs, switches and routers that runs in your browser
Stage
Not given
Not given
Founded
Not given
2022
Based in
US
FR
Pricing model
Freemium
Free
Pricing
Free: $0/month with 10,000 requests/month and local mocks only. Pro: $29/month with 250,000 requests/month, 100,000 platform AI tokens/month, and 3 hosted mocks. Team: $99/month with 1,000,000 requests/month, 1,000,000 platform AI tokens/month, and unlimited hosted mocks. Annual plans include 2 mont
Not given
Key features
Multi-protocol support (REST, gRPC, GraphQL, WebSocket, Kafka, MQTT and more)
Realistic data synthesis with template tokens and faker fields
Latency and fault injection for testing retries and fallbacks
Record and replay for capturing and replaying live traffic
Modern admin UI for managing servers, overrides and metrics
Configuration as code with OpenAPI specs and YAML
Local-first development without account requirement
CI integration with local endpoints
HTTP bridge exposing gRPC services over REST
BYOK AI integration with user provider keys
Visual lab editor with drag-and-drop interface for network devices
Mix containers and VMs in the same lab
Configure switches with VLANs and trunks
Automatic or manual routing between networks
Add network conditions like latency, jitter and packet loss
Export to Docker Compose, Vagrant, Proxmox, Kubernetes and cloud platforms
Import GNS3 projects and convert them to labs
Real-time validation as you design
Desktop app with consoles, VNC screens and packet capture
Works offline and runs entirely in the browser
What makes it different
Multi-protocol mocking from one configuration file
Realism-first simulation with data synthesis and failure injection
Open source with permissive MIT or Apache-2.0 licensing
Local-first approach with optional cloud collaboration
Deploy to cloud hosting with a single command
Runs in your browser with no installation or account required
Exports to multiple environments from one lab design
Private by design with no data leaving your browser
Open isoloom.yml format that you own and can version control
MockForge
Isothrum