The internet belongs to everyone. Your data belongs to you.
Calimero is an open-source app platform for the Open Web, where data stays with the person, team, or company it belongs to — encrypted end to end and synced device to device. Not readable by the nodes that keep an app online, and not by us.
Calimero is an open-source app platform for the Open Web, where data stays with the person, team, or company it belongs to — encrypted end to end and synced device to device. Not readable by the nodes that keep an app online, and not by us.
Backed by
Reclaim data controlwith a private data layer your apps build on
You are in full control over who can access your data, ensuring privacy, security, and autonomy over your personal information and interactions within the network.
No Central Authority
The networks deployed on Calimero are fully decentralized and managed by the network participants. You own your data!
Client Side Verified
Every action inside a Calimero app is verified using cryptographic signatures tied to the user's identity, held on their own device.
Strong Encryption
Peer interactions inside a Calimero app are encrypted, and protected from any unauthorized third party.
Local Data Vault
The data is stored on the user's device and all state transitions are applied locally ensuring data ownership.
The dark
side of data
Globally 85%
of adults want to do more to protect their online privacy
More than 75%
of adults feel tech companies have too much control over their data
More than 80%
of adults support requiring companies to minimize the types of user data they collect.
278.83 million
individuals affected by data breaches in the U.S. in 2025
3,222
data breaches reported in the U.S. in 2025
25% of adults
are asked to agree to a privacy policy every day.
Builder Benefits
Building privacy preserving applications has never been simpler. Write your app logic in Rust, connect from JavaScript, Python, Swift or Kotlin, and run it on any device — bringing full data ownership to you and your users.
Developer Friendly
Write apps in Rust, then connect from JavaScript, Python, Swift, or Kotlin. Encryption, sync, and peer networking are handled for you — no cryptography expertise required.
Cross Platform Support
Calimero is built using a WASM runtime allowing it to be run on different platforms including servers, desktops, browsers and mobile.
Privacy and Verifiability
Strong encryption using forward secrecy and post-compromise security with zero trust in third parties out of the box.
Data Ownership
Putting user data back in their hands — stored on their own devices, with full control over who can access it and how it is used.
Sovereign Digital Identity
One account across all your devices, with keys generated and held on-device. An offline recovery key can revoke a device you no longer trust.
Built to be
composable Plug Calimero into the tools and protocols you already use
Your data stays on your device. Run AI models over your own data, and let agents act on it, without ever handing it to a third party.
Delegate work to nodes running inside a trusted execution environment. A node proves what it is running through Intel TDX attestation before a group admits it, and members can verify that proof themselves.
Bridge to external systems and blockchains when an app needs them, for settlement, identity, or as a source of truth, while everyday application logic stays local and private.
Built for the Open Web
Encryption
Data is encrypted and stored securely on local storage (node), ensuring only the owner has access. Data remains hidden from unauthorized individuals and is only accessible to those explicitly granted access by the owner.
Verified Compute
Actions performed are verified by the peers interacting within the app's private context. Every interaction is signed, tied to the specific node identity of the user, ensures that all interactions are authenticated and secure.
Interactivity
Calimero apps are composable, allowing plug-and-play integrations between applications across the ecosystem — making every app a reusable building block.
Verifiable
computing
Private by default, verifiable by everyone
Data Security & Ownershipwith Calimero
Create applications where each user controls their personal data through Calimero's peer-to-peer data streams.
You decide who has access to your data by providing access to specific peers. This level of control allows you to maintain privacy and security.
Execute your actions freely without the fear of censorship, ensuring that you are never restricted by centralized entities.
You stay in control of your data — with Calimero you decide who you share it with and how it is used. Your data on your own terms.
Today’s world
revolves around data
It is the most valuable resource. Yet, it is often collected and used without your permission, or without you even knowing about it. Causing it to be extremely vulnerable.
