Castellum v0.2.1 — Gmail sign-in fix

Castellum v0.2.1 — fixes Gmail sign-in.

Fixed

• 🔑 Gmail login now completes. The token exchange failed with "client_secret is missing"; Castellum now includes the Google Desktop client secret (the standard, Google-sanctioned approach for desktop apps — PKCE protects the flow and your tokens stay encrypted in the macOS Keychain).

Note for Gmail

If you see "Access blocked: … developer-approved testers", the app's Google consent screen is in testing mode — the developer must add your address as a test user. Outlook/iCloud/Fastmail and any IMAP account work without this.

Download

• Castellum-arm64.dmg — macOS 12+, Apple Silicon. Signed + notarized. Verify with Castellum-0.2.1-SHA256SUMS.txt.
• Already on v0.2.0+? It will auto-update. Otherwise download once; updates are automatic after.

Castellum v0.2.0 — auto-update, sample-data choice, one-click AI

Castellum v0.2.0 — a big update. Re-download once; future updates install themselves (new in this release).

New

• 🔄 In-app auto-update — Castellum now updates itself; you won't need to re-download again.
• 🧪 Sample data is now your choice — onboarding offers "Explore with sample data" or connect your own email, plus a "Skip for now" option. Load/remove sample data anytime in Settings.
• 🧠 One-click local AI — a guided setup installs the AI model for you (no terminal).
• 🐛 Report a Problem — built-in diagnostics → prefilled GitHub issue.
• 📊 Performance HUD + Focus Mode — optional, off by default.

Fixed

• Removed the app name from the sidebar top-left where it collided with the macOS window buttons.

Download

• Castellum-arm64.dmg — macOS 12+, Apple Silicon. Signed + notarized. Verify with Castellum-0.2.0-SHA256SUMS.txt.
• First launch: right-click → Open if macOS asks.

Gmail one-click + any IMAP/SMTP (Outlook, iCloud, Fastmail). Local AI, keyboard-first, your mail stays on your Mac.

Castellum v0.1.1 — fixes launch crash

Castellum v0.1.1 — critical fix: the app now launches correctly when installed.

Fixed

• 🐛 App crashed on launch (SIGSEGV on startup). The packaged sqlite3 native module was built against the wrong Node ABI; it's now rebuilt against Electron's ABI, and the build is gated so this can't regress. If you downloaded v0.1.0 and it wouldn't open, this build fixes it — delete the old app and install this one.

Download

• Castellum-arm64.dmg (stable latest link) — macOS 12+, Apple Silicon (M1–M4)
• Signed with an Apple Developer ID and notarized by Apple
• Verify against Castellum-0.1.1-SHA256SUMS.txt

Install

1. Open the .dmg, drag Castellum to Applications.
2. First launch: right-click → Open if macOS asks.

Gmail one-click sign-in + any IMAP/SMTP provider (Outlook, iCloud, Fastmail). Local AI, keyboard-first, your mail stays on your Mac.

Castellum v0.1.0 — first public macOS build

Castellum v0.1.0 — the first public build of a private, AI-powered email client for macOS.

🌐 https://castellummail.com

Download

• Castellum-0.1.0-arm64.dmg — macOS 12+, Apple Silicon (M1–M4)
• Signed with an Apple Developer ID and notarized by Apple (Gatekeeper-approved)
• Verify your download against Castellum-0.1.0-SHA256SUMS.txt

Install

1. Open the .dmg and drag Castellum into Applications.
2. On first launch, if macOS asks, right-click the app → Open.

What's inside

• 📥 Gmail in one click, or connect Outlook / iCloud / Fastmail / any server via IMAP/SMTP
• 🧠 Local AI (Ollama) — summaries & triage run on your Mac; email never leaves it
• 🗂️ Active Work kanban to track follow-ups and overdue replies
• ⌨️ Keyboard-first navigation (j/k, /, command palette)
• 🔒 Compliance-first defaults — local-only AI mode on from first launch

Notes

• Microsoft 365 one-click sign-in is coming soon — Outlook works today via manual IMAP/SMTP.
• This build targets Apple Silicon. Source is private; this repo hosts release binaries only.