Electron Local-First Apps: Review the File Access Boundary

Evaluate a local-first Electron app by asking which files it can access, which operations remain on the device and which optional features contact a service. “Local-first” is a product description that needs a concrete scope, not a substitute for a data-flow explanation.

The Electron catalogue includes Acres, described as a visual Markdown workspace with notes in a user-owned folder, and TopLocal Studio, described as an offline local AI application. These are listing claims, not independent security or network audits.

Separate the workspace from the whole device

A note application may need access to a selected folder. That does not imply that every piece of displayed content should receive authority over all accessible files.

Ask how the user chooses the workspace, whether the scope can be changed and what happens when the folder becomes unavailable. A clear folder boundary makes backup, export and permission explanations easier.

For a product you develop, trace file operations to the privileged process that performs them. Keep that operation specific enough to enforce the intended workspace boundary.

Treat imported content as content

Markdown, HTML previews and downloaded material can contain more than plain text. Electron's security guidance emphasizes protecting privileged capabilities from untrusted content and validating the sender of inter-process messages.

Review how imported documents become rendered content. A document should not acquire file-writing authority because it appears inside a trusted desktop window.

Use harmless synthetic documents for an authorized test. The goal is to verify the application's boundary, not to experiment with private work or third-party systems.

Explain optional network features independently

A workspace can store notes locally while offering a remote AI feature. An offline generation feature can still have a separate download or update workflow.

For each feature, ask what leaves the device, what must be downloaded and what remains available without a connection. Keep optional services visible in the product's documentation and controls.

Do not infer network behavior from the framework alone. Electron supports many architectures, and a listing cannot establish which one a product uses.

Check ordinary file conflicts

Open a synthetic note in the application and an external editor if the product supports that workflow. Modify it in both places and observe how conflicts are presented.

Also test a renamed folder, a missing attachment and a read-only location. These cases reveal whether “your files” remains a usable promise under normal operating-system behavior.

Preserve the original content during the trial. A conflict-resolution feature should make the competing versions understandable rather than silently selecting the last writer.

Ask how recovery works

Find the documented boundary between undo history, application backups and operating-system backups. They solve different problems. Undoing a recent edit does not necessarily recover a deleted workspace or an older attachment.

Record the exact version and scope of your observations. A good evaluation states which workflow was checked and which questions remain open.

For implementation-level review of the renderer-to-native connection, continue with the Electron context-bridge guide. That narrower boundary helps turn a local-first promise into enforceable application behavior.