Choosing Between Tauri’s Built‑in Updater and a Custom Update Solution

Decision and constraints

When distributing a Tauri desktop app you must decide how to deliver updates to users. The decision hinges on three constraints:

1. Target platforms: Windows, macOS, and Linux (the desktop OSes Tauri supports).
2. Release assets must be served over HTTPS and be code‑signed for each platform.
3. The app’s Content Security Policy (CSP) forbids arbitrary remote code execution, so any update mechanism must work within Tauri’s sandbox.

Given these constraints, you can either rely on Tauri’s official tauri-updater crate or build a completely custom updater using Tauri’s IPC and HTTP client.

Option comparison

Option	Setup Complexity	Update Control	Binary Size Impact	Platform Support
Tauri built‑in updater (tauri-updater)	Low – add dependency, configure updater.rs	Limited to version check and install (no pre‑install hooks)	Small (~50 KB)	Windows, macOS, Linux
Custom IPC/HTTP updater	Medium – write update service, handle downloads, verification	Full – custom channels, staging, rollback, pre‑install scripts	Moderate (extra HTTP client code)	Windows, macOS, Linux

Trade‑offs

The built‑in updater reduces boilerplate and leverages Tauri’s signed‑asset verification automatically. It is ideal when you only need a simple version check and silent install. However, it offers limited extension points: you cannot inject custom logic before the binary is replaced, nor can you easily implement staged rollouts or user‑selectable update channels.

A custom updater gives you complete freedom. You can implement delta updates, show a progress bar, prompt the user, or keep multiple versions for rollback. The cost is additional code, testing, and the responsibility to perform cryptographic verification yourself (e.g., checking signatures with ring or openssl).

Concrete implementation – built‑in updater

Below is a minimal, production‑ready setup that satisfies the constraints. No claim is made that this exact code was tested; it reflects the typical pattern documented in Tauri’s guide.

1. Add the dependency

# Cargo.toml
[dependencies]
tauri-updater = { version = "0.12", features = ["custom-protocol"] }

2. Create the updater module

Place this file at src-tauri/updater.rs. It spawns a background task that checks for updates when the app starts.

use tauri::{Builder, Handle, Manager};
use tauri::async_runtime;

pub fn init() {
    Builder::default()
        .setup(|app| {
            let handle = app.handle();
            // Spawn the update check on the async runtime
            async_runtime::spawn(async move {
                let _ = tauri::UpdaterBuilder::new()
                    .build(handle)
                    .await;
            });
            Ok(())
        })
        .run(tauri::generate_context!())
        .expect("failed to run app");
}

3. Call the initializer from main.rs

mod updater;

fn main() {
    updater::init();
}

4. Publish a release manifest

Host a JSON file at https://example.com/tauri/{version}/app-update.json (replace {version} with the actual version string). The manifest must follow Tauri’s schema:

{
  "version": "1.2.0",
  "notes": "Fixed security issue and added feature X",
  "pub_date": "2026-09-30T12:00:00Z",
  "platforms": {
    "windows": {
      "signatures": {
        "sha256": "abcd1234..."
      },
      "url": "https://example.com/tauri/1.2.0/myapp-windows.zip"
    },
    "darwin": {
      "signatures": {
        "sha256": "efgh5678..."
      },
      "url": "https://example.com/tauri/1.2.0/myapp-darwin.dmg"
    },
    "linux": {
      "signatures": {
        "sha256": "ijkl9012..."
      },
      "url": "https://example.com/tauri/1.2.0/myapp-linux.AppImage"
    }
  }
}

The signatures.sha256 field is verified by Tauri’s updater; you must generate it with cargo tauri sign for each platform before uploading.

5. Verification steps (no test claims)

1. Run cargo tauri sign for each target, then cargo tauri build to produce signed binaries.
2. Upload the binaries and the manifest to an HTTPS server that serves the correct CORS headers.
3. Install the produced installer/package on a test machine.
4. Start the app; if the manifest contains a higher version than the installed binary, Tauri will show the update dialog (or perform a silent install if configured).
5. After the update completes, the app restarts and you can confirm the new version via tauri::package_info!().version.

When to choose a custom updater

If your product requires any of the following, consider building a custom solution:

• Staged rollout (e.g., 5 % of users first, then increase).
• User‑selectable channels (stable, beta, nightly).
• Pre‑install scripts that migrate user data or adjust permissions.
• Custom UI for download progress or mandatory update enforcement.

A minimal custom updater would use Tauri’s invoke IPC to call a Rust command that:

1. Downloads the manifest via reqwest (or ureq) over HTTPS.
2. Compares the manifest version with tauri::package_info!().version.
3. Downloads the asset, verifies its signature (using the same signing key used in cargo tauri sign), and replaces the binary.
4. Signals the frontend to restart the app.

Because this path duplicates verification logic, you must audit the cryptographic steps carefully to avoid supply‑chain risks.

Limitations and practical checks

The built‑in updater only runs in production builds; debug builds skip the check to prevent interference during development. On macOS and Windows, the OS may block execution of a newly downloaded binary if the signature is missing or invalid—Tauri’s updater handles this automatically when the asset is properly signed.

To verify that the update mechanism works without a remote server, you can point the updater to a local manifest:

tauri::UpdaterBuilder::new()
    .set_url("http://localhost:8080/app-update.json")
    .build(handle)
    .await;

Serve a manifest with a higher version number from a simple HTTP server (e.g., python -m http.server 8080) and observe the update flow. After the update, check the version string as described above to confirm success.