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Interactive supervision tree
Explore your application's supervision hierarchy through an interactive visualization. Understand how your system is structured and navigate thousands of processes with ease.
Understand your BEAM system.Instantly.
Voyager is a modern runtime inspector for Erlang and Elixir. Explore supervision trees, inspect processes and debug BEAM applications through a modern interface and MCP.
Why Voyager?
The BEAM runtime already provides some of the most powerful introspection tools available in any programming ecosystem - tools like Observer, recon and the Erlang runtime itself expose everything from supervision trees to memory usage.
The problem isn't the capabilities. Many of these tools have steep learning curves, outdated interfaces, or require switching between graphical apps, shell commands and docs just to answer a simple question.
Voyager brings these powerful capabilities together into a single modern interface - making runtime introspection faster, more approachable and easier to understand.
Features
Everything you need to see inside a running BEAM node in one place.
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Process inspector
Inspect process state, mailbox, dictionary, links and runtime information without jumping between shell commands.
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Node overview
See the health of your node at a glance with memory usage, scheduler information, process counts and other runtime statistics.
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Remote node support
Connect to local and remote BEAM nodes in seconds using Erlang distribution.
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Built for production debugging
Designed to inspect running production systems safely while minimizing runtime overhead.
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Learn OTP visually
Voyager makes abstract BEAM concepts tangible. Explore supervisors and processes interactively instead of reading docs or digging through source.
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MCP integration
Expose Voyager through the Model Context Protocol, allowing AI assistants to inspect and reason about your running BEAM applications.
See Voyager in action
A quick walkthrough of Voyager exploring a live BEAM system.
Coming soon
Future capabilities in development - queued for launch as Voyager expands its view into the runtime.
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Tracing
Capture and inspect runtime events without modifying your application code. Follow process interactions and investigate complex production issues.
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ETS Explorer
Browse ETS tables through a modern interface. Inspect table contents, metadata and statistics without writing shell commands.
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Runtime Charts
Visualize memory usage, scheduler activity and other runtime metrics over time. Spot trends and anomalies snapshots can't reveal.
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AI Assistant
A dedicated agent equipped with BEAM-specific skills, curated prompts and rich runtime context, so your favorite LLM reasons about your system.
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Memory Allocators
Understand how memory is allocated inside the BEAM VM. Explore allocator statistics and identify potential memory bottlenecks.
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Sockets Explorer
Inspect active network sockets, their state and associated processes. Gain deeper visibility into your application's networking layer.
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Ports Inspector
Explore open ports and external connections used by your application. Understand how your node talks to the outside world.
Pricing
Individuals, small companies, and non-profits use Voyager for free. Larger for-profit organizations need a Company License.
Read the license.
For individuals and companies of up to 10 people
Free License
- Full product access
- Free 90-day evaluation period
Required for companies of 11+ people
Company License
- Same functionalities as Free License
- Commercial use at company scale
- Prioritized support
- Private Slack or Discord
FAQ
Everything you need to know about the Voyager license, commercial use, and pricing.
No. Voyager's source code is publicly available (source-available), but it is not open source under the OSI definition. Its use is governed by the Voyager License, which includes conditions not found in OSI-approved licenses.
The code is openly available, and individuals and small companies use it for free. To fund ongoing development and maintenance, larger for-profit organizations — those best able to afford it — pay for a Company License. This keeps the project maintained, updated, and healthy for everyone.
Functionally, nothing. It's the same program with the same code. A Company License is not a different product — it grants the right to use Voyager commercially above a certain company size, plus prioritized support scheme.
You are eligible for the Free License if you are:
- an individual (including for commercial use),
- a for-profit organization with up to 10 employees, or
- a non-profit or not-for-profit organization.
You can also use Voyager for free while still evaluating whether it's a good fit and not yet using it commercially, regardless of your size.
The 10-employee threshold counts everyone working for your organization, including part-time employees and contractors.
You can use Voyager as an internal working tool to deliver consulting or professional services to a client (e.g. analyzing or optimizing their infrastructure), provided that:
- only your own personnel use Voyager,
- the client gets no direct or indirect access to it,
- Voyager itself is not resold, hosted for, or made available to the client, and
- what you deliver is the results and work product, not Voyager or access to it.
Whether you need a Company License depends on your own company size, not the client's.
Yes, if it runs OTP 27 or later and Erlang distribution is enabled (a name and a cookie). Language does not matter: Elixir, Erlang, and Gleam are all supported. Need older OTP? Tell us what you run.
Yes. You may create public forks and modify the code to prepare contributions (pull requests) back to Voyager. What's not allowed is maintaining a fork as a separate, competing product, or selling/sublicensing your own derivative.
Yes, you may modify the code for internal use to fit your own use case. You may not sell, rent, license, or sublicense a derivative of Voyager, nor offer it as a hosted or "as-a-Service" product.
Yes. You can use Voyager for free while evaluating it, regardless of company size. Once you're no longer eligible for the Free License, the free evaluation period lasts 90 days — after that, if you're a for-profit organization above the size threshold and using Voyager commercially, you'll need a Company License.
Visit the contact page to request a Company License.
Once you cease to be eligible for the Free License, you have a 90-day period during which you can continue using Voyager for free — giving you time to obtain a Company License. You won't be in breach overnight.
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