Replace manual API chains
Wire HTTP requests into visual workflows on a 2D canvas and run the entire chain with a single click—no more copy-pasting between tools.
Built for API builders
Flowter is a Windows desktop app for visually designing and running automated API workflows—no cloud account, no scattered scripts.
Wire HTTP requests into visual workflows on a 2D canvas and run the entire chain with a single click—no more copy-pasting between tools.
Success and failure paths branch after every call. Live node status and a full request/response timeline tell you where things broke.
Design, execute, and inspect your API flows in a single place instead of bouncing between Postman, notes, and one-off scripts.
Features
A visual node canvas, HTTP request nodes, branching logic, and deep inspection—all stored locally on your machine.
Flowter workflow canvas — design and connect API steps visually
Design flows on an infinite-style canvas with zoom, drag, and a dot-grid background built for clarity.
Link nodes from output ports to input ports. Lines draw automatically and persist when you save.
Node positions and connections restore exactly as you left them every time you reopen a flow.
Create, select, and delete independent workflows from a sidebar—each with its own canvas and configuration.
Collapse the flows sidebar to maximize canvas space when you need room to think.
Every flow begins with an INIT node that defines which steps run first—your workflow entry point.
Configurable API nodes with Success and Failure output paths for branching after each call.
Edit title, URL, HTTP method, query parameters, request body, and headers in a dedicated editor panel.
Toggle individual parameters and headers on or off without deleting them—clean up connections automatically on delete.
Run the selected workflow end to end. The engine starts at INIT, follows connection paths, and branches on success or failure.
Watch a loading spinner while nodes run, then see Success or Failure badges appear on each step in real time.
Review headers, formatted response body, status code, and timing for every executed node in a full timeline view.
Per-workflow key/value store for shared data that flows between steps in the same run.
All data lives in your Documents/Flowter folder. No database, no cloud sync—lightweight file-based persistence.
Built with Electron for Windows. Pre-built installer available as Flowter Release LTS via GitHub Releases.
Timeline inspector — request/response details for every executed step
How it works
Seven steps to design, wire, and execute your first API flow.
Open the sidebar and create a new flow. Each flow is an independent workspace with its own canvas and settings.
Every flow starts with an INIT node. Add HTTP Request nodes from the workspace and place them on the grid.
Set the URL, method, query parameters, body, and headers for every HTTP node in the dedicated editor.
Connect Success and Failure outputs to define branching logic after each API call completes.
Add key/value pairs to the Stack panel when steps need to share data across the workflow run.
Hit Play to run the workflow. The engine executes nodes in order, following your connection paths and branching rules.
Check Success and Failure badges on each node, then open the timeline inspector for full request/response details.
Why Flowter
Purpose-built for developers and API testers who want control, clarity, and privacy.
Workflows and data stay in Documents/Flowter on your PC. No cloud account, no vendor lock-in.
See your entire API chain on a canvas—ports, connections, and branching logic at a glance.
Success and failure paths after every HTTP call—not just linear scripts that break on the first error.
Timeline inspector and stack panel give you full visibility into every request, response, and shared value.
Minimal dependencies, file-based persistence, and no database overhead—just flows that run.
Windows desktop application
Download the pre-built Flowter Release LTS installer from GitHub Releases. Your workflows are stored locally in Documents/Flowter—no sign-up required.
Available for Windows. macOS and Linux are not supported at this time.