Zero-knowledge by design.
We build apps that do not collect your personal data, phone number, email, or contact list. Privacy is our foundation.
Hello, we’re MumlinePrivacy tools.
Privacy tools.
Built different.
Mumline is an independent Android app studio dedicated to creating tools that protect your digital sovereignty.
Our purpose
Software built to protect your private space without compromise.
Mumline designs and develops Android applications with privacy as the absolute foundation. Every architectural choice — from RAM-only relays to zero internet permissions — is engineered to protect your personal space.
Our collection consists of three focused applications: Ciphera (encrypted messaging), Quiet Drop (offline file transfer), and Calculator Vault (concealed hardware storage).
See the collectionWhat guides usThree simple
Three simple
principles
100% on your device.
Your files and communications belong to you alone. We operate no cloud telemetry, user profiling, or background tracking.
Google Play closed testing.
Each tool addresses one distinct everyday privacy need, verified against modern Android security standards and Google Play policies.
A shared foundationMumline, powered
Mumline, powered
by SparkNX.
Support from SparkNX.
Privacy and usefulness at the heart of Mumline.