Aetherloom is an open-source native macOS app that keeps your folders safely in sync across the clouds and storage you control. It lets you use multiple cloud ecosystems while keeping complete, readable copies of your files in more than one place.

Can it sync folders between two clouds, like Google Drive and OneDrive?

That is the goal. You choose folders, and Aetherloom keeps them aligned across every location in the sync set — cloud, Mac, or NAS. Cloud provider integrations are still in development; the provider-agnostic sync engine comes first.

Can it sync a NAS with cloud storage?

Yes. NAS-backed folders mounted over SMB, AFP, or NFS are first-class sync locations. If a share disappears — the Mac slept, the network changed, credentials expired — Aetherloom treats it as unavailable, never as deleted files.

Will Aetherloom ever delete my files?

Not permanently, during normal sync. Deletes use each provider's trash or recycle bin where possible, conflicting edits are preserved as both versions, and a suspicious mass deletion pauses sync until you review it.

Is Aetherloom a backup tool?

No. Synchronized copies keep your files available if you lose access to a location, but sync is not versioned backup. Keep an independent backup of files you can't afford to lose.

Is Aetherloom free and open source?

Aetherloom is open-source and developed in public on GitHub under the Apache License 2.0.

Aetherloom is in early development and not yet available to download. Follow the project on GitHub to watch progress, open issues, or contribute.

Open source·In development

Keep your clouds interwoven.

Aetherloom is an open-source native macOS app that keeps your folders safely in sync across the clouds and storage you control. Use the cloud features you like without locking your files into one provider or place.

View on GitHub

Aetherloom Overview screen scanning your clouds, showing connected locations and safety review status

What it does

Choose folders. Aetherloom keeps them aligned across locations.

Aetherloom keeps the same files synchronized across different cloud ecosystems, so you can use the features you like from each provider while keeping complete, readable copies in more than one place.

Sync locations

●Cloud folders and drives — iCloud Drive, Google Drive, and OneDrive first
●Local folders on the Mac
●NAS-backed folders mounted through SMB, AFP, NFS, or other macOS-supported network filesystems

What gets synced

●New and edited files, and new folders
●Renames and moves
●Deletes — using each provider's trash or recycle bin
●Conflicts — by preserving both versions

Safety first

Your files stay under your control.

Sync tools shouldn't surprise you. Aetherloom shows its work before touching your files — and pauses for review when a change set looks suspicious.

Safe-delete flows

During normal sync, deleted files move to each provider's trash or recycle bin where possible instead of being permanently removed.

Outages aren't deletions

A provider outage, an unmounted NAS, a sleeping volume, or a disconnected disk is treated as unavailability, not as deleted files.

Conflicts keep both versions

When a file was edited independently in two places, nothing is overwritten. Both versions are preserved until you decide.

Advice that stays on your Mac

On Apple Silicon, an optional on-device model can suggest which conflict version to keep. It only advises; you decide.

Pauses when things look off

A suspicious change set — like a mass deletion — pauses sync until you've reviewed exactly what would change.

Every change starts as a plan

Risky changes are shown as a sync plan first. Nothing is applied until you've seen what Aetherloom intends to do.

A look inside

Native on macOS, through and through.

Sync Sets — Folders and drives you chose to keep in sync, grouped by mirror.

Local & NAS

First-class sync locations, not an afterthought.

A sync set that includes your Mac or NAS means a complete copy on hardware you own — plain files and folders you can open, move, or walk away with, no export required.

A mounted network share can disappear because the Mac slept, the network changed, credentials expired, or the NAS is temporarily unavailable. Aetherloom treats those states as provider unavailability — never as file deletion.

Deletes still follow the same philosophy: prefer trash, preserve conflicts, verify destination state before overwriting, and pause when the volume state is uncertain.

Current status

Early development, built in the open.

Aetherloom is still young, but the foundation is already taking shape: safe sync plans, conflict preservation, approval gates, and a provider-agnostic engine for keeping files aligned across the places you choose.

Follow the project →

Provider-agnostic sync engine
Folder selection
Sync plan preview
Activity log
Conflict detection
Safe-delete flows
Local folder support
On-device AI conflict advice
NAS-backed folder support
iCloud Drive folder support
Google Drive support
OneDrive support
Dropbox support

In progress Planned

A note on iCloud Drive

iCloud Drive doesn't offer a general-purpose cloud file API like Google Drive or OneDrive. Aetherloom's iCloud support works through the local iCloud Drive folder on macOS.

Not a backup replacement

Lose access to one location, and your files still live elsewhere as complete, readable copies. Aetherloom improves availability, but sync is not a replacement for versioned backup.

AI-first development workflow

Architecture, product direction, review, and safety decisions are coordinated by a human developer while AI agents help implement and iterate on the codebase.