Unfour

What is Unfour

Unfour is a backend troubleshooting workspace built to follow one failing request from the API layer through SSH/server logs and database state until the issue is verified as fixed. It is a desktop app with a local-first model, so the workspace starts on your device and keeps project context there by default.

The product is designed around one investigation flow rather than a collection of unrelated utilities. Its own walkthrough shows a five-step path: reproduce the request, inspect logs, query data, compare evidence, and re-run the request after the fix. That makes it different from using a separate API client, terminal, and database tool with no shared context.

Unfour’s core desktop features are free and open source under the Apache-2.0 license. The site also says Cloud Sync is optional and tied to a Pro entitlement, while the local core remains available.

Key features

Unfour centers the investigation around one workspace and one project context.

• API Client: send the failing request again, manage workspace variables, and inspect the response that begins the debugging process.
• SSH Terminal: connect to servers, review remote files and logs, and follow the error to the place where it is handled.
• Database Explorer: browse affected records and run SQL to test what the response is reading or writing.
• MCP integration: approved Unfour MCP tools can expose runtime evidence to agents such as Codex and Cursor, while those agents still use their own coding tools for edits.
• Saved context: connections, environment variables, and project state stay attached to the workspace so you do not have to rebuild the setup every time.
• Local-first workflow: the app runs locally on your device and supports device-local connection credentials.
• Optional Cloud Sync: per-workspace sync is available for supported records, with credential and secret-field boundaries defined by the product.
• Open source core: the site highlights a free core and a GitHub source link.

How to use it

Unfour follows a practical troubleshooting loop instead of forcing you into a fixed repair pattern.

1. Open or create a workspace for the backend system you want to investigate.
2. Reproduce the failure in the API Client by sending the request again and reviewing its response.
3. Inspect server evidence in the SSH Terminal to look at logs, files, and nearby runtime behavior.
4. Check database state in the Database Explorer to see whether the request read or wrote the wrong records.
5. Compare the evidence across request, logs, and data to narrow down where the issue started.
6. Verify the fix by re-running the original request after the code or data change.

If you work with an agent, Unfour can also provide approved runtime tools through MCP so the agent can inspect backend behavior using the workspace policy you choose.

Who it is for

Unfour is aimed at people who need to debug server-side failures with real runtime evidence.

• Backend developers investigating production-like or staging issues.
• Engineers who need to correlate API behavior with logs and database records.
• Teams that prefer a single desktop workspace over switching between multiple clients.
• People using coding agents who want the agent to see runtime evidence, not just source code.
• Developers who want local desktop tooling without requiring a subscription for the core app.

The product is especially relevant when a failure cannot be explained from source code alone and you need to see what the system actually returned, logged, and stored.

What to know before you use it

Unfour is helpful for tracing backend bugs, but it is not a replacement for every operational tool.

• It is focused on investigation and verification, not on replacing your full server administration stack.
• The site describes core API, SSH, and database tools as free and open source, but Cloud Sync is tied to Pro entitlement; exact pricing details are not shown in the harvested text.
• Because it is local-first, setup and saved context live on your device unless you enable workspace-level sync.
• MCP access depends on approved tools and the environment policies you choose; it does not give agents unrestricted access by default.
• The database and log views are meant for debugging and inspection, so you should still use your official infrastructure or database admin tools when you need canonical operational records, advanced administration, or provider-specific controls.
• The app’s own walkthrough is built around a single investigation flow; if your incident requires broad observability, alerting, or fleet-wide monitoring, you will need complementary tooling.

In short, Unfour helps you move from a failing API request to evidence-backed verification in one local workspace, and it is best when you want a focused backend debugging loop rather than a general observability platform.