In-app Office preview
.DOCX, .XLSX and .PPTX files can preview inside the app. Formatting may differ from the original document.
DARKMATTER
VAULT
A private archive for things worth keeping
Save selected media, files and links in one protected place - separate from your camera roll, organized for later and backed up on your terms.
Why DarkMatter
Not everything belongs in Photos
Some content is personal, important, sensitive or simply worth keeping separate. DarkMatter gives selected content a calmer place of its own.
- Move selected content out of everyday camera roll browsing.
- Keep the app focused on archiving, not pretending everything is a secret.
- Start from the home screen and choose what belongs in the vault.
One place for media, files and links
DarkMatter is for selected content that deserves its own quiet shelf, away from the flow of everyday apps.
- Keep photos, videos, audio, documents, archives and links together.
- View saved items with previews, names, sizes and source details.
- Use one surface for things that otherwise end up scattered.
Keep the reason attached
Notes belong with the item they explain. The point is not to create another notes app, but to keep the context close to the thing you saved.
- Use item notes for why something mattered.
- Keep context tied to saved media, files and links.
- Return later without reconstructing the reason from memory.
Private by design
DarkMatter is designed for local device storage. App Lock can protect the vault UI and Vault Encryption can add stronger local protection when you need it.
- Saved items stay on your device unless you share them or export a backup.
- App Lock supports PIN, passphrase and biometric unlock.
- Vault Encryption protects saved files and sensitive metadata after App Lock is enabled.
Built to find things again later
The goal is not only to store content. It is to help you find it again when the archive grows.
- Filter by type, starred state and archive details.
- Jump between months instead of scrolling forever.
- Use previews, names, sizes and source details to recognize saved items.
Your archive should survive your phone
A private archive becomes more valuable over time. DarkMatter can create an encrypted backup of saved items, settings, attached notes and files so the archive is not tied to one device.
- Create an encrypted local backup file.
- Restore the archive on another device with the password you chose.
- Decide where the backup file goes after DarkMatter creates and verifies it.
Experimental features
Advanced options, kept out of the main path
DarkMatter keeps a few opt-in tools in Settings for file previews, format compatibility and optional link previews. They are experimental, may vary by file or page and are not required for the core archive.
Unsupported media conversion
Selected video and audio files can show a compatibility option when the normal preview flow cannot open them.
Optional link preview
When enabled, a link you save can offer an optional preview. If a preview isn't available, DarkMatter simply keeps the page as a saved link.
Manual first, automatic only if enabled
Automatic link handling is a separate experimental setting. The archive always keeps the original link when a preview isn't useful.
FAQ
Questions before you start your archive
Is DarkMatter a cloud service?
No. DarkMatter is designed as a local vault. Saved items stay on the device unless you share them or export a backup.
Is my content stored locally?
Yes. Saved files and metadata are kept in local app storage on the device.
What can I save?
Media, files and links. Notes can be attached to saved items.
Can I attach notes?
Yes. Notes are attached to saved items so context stays with the item.
How does App Lock work?
App Lock can require a PIN or passphrase before the vault UI opens. Biometrics can be used as a convenience unlock when available.
What does Vault Encryption do?
Vault Encryption can encrypt saved files and sensitive metadata on the device. App Lock must be enabled first.
How secure is Vault Encryption?
Vault Encryption uses a separate random vault key to encrypt saved files and sensitive metadata on this device. That key is wrapped with your App Lock PIN or passphrase using PBKDF2-HMAC-SHA256 and AES-256-GCM, then the wrapped record is stored in the device secure store. When the vault locks, DarkMatter clears the unlocked key and decrypted cache. This adds strong local protection, but it is not a replacement for protecting your device, remembering your App Lock secret and keeping backups safe.
Can I move my archive to another device?
Yes. Create an encrypted backup, save it somewhere safe, then restore it with the backup password.
What if I forget my backup password?
DarkMatter cannot recover forgotten backup passwords.
Why use DarkMatter instead of Photos or Files?
DarkMatter gives selected content its own private archive, with organization tools, attached notes, protection options and encrypted backup support.