Open source · Privacy-first · Latin America

Collective decisions,
without intermediaries.

An app for groups of 10 to 200 people to propose, vote, and register decisions. No administrators with permanent power. Data never leaves your group.

⬤ 4 peers
Active votes
Change weekly meeting day
Routine · 14h left
✓ 12 yes✗ 6 no
Accept Carmen Flores
Important · 2d left
✓ 7 yes✗ 1 no
Last decisions
Emergency fund: 500 PEN
R-008 · 3 days ago
Approved
10–200 members
No administrators
Biometric verification
Immutable record
Right to erasure (Ley 29733)
Open source
Works offline
How it works

Four steps to a legitimate decision.

No training required. Designed for people who have never used a governance app — and for those in a meeting, outdoors, with five minutes.

01
Join the group
Someone sends you an invite code. You open the app, enter your name and the last 4 digits of your ID. Register your fingerprint. Done.
02
Propose something
Write what you're proposing and why. Choose the type (routine, important, urgent). The app sets the rules automatically.
03
Vote
One tap: yes, no, or abstain. Confirm with your fingerprint. The app prevents double voting. One person, one vote.
04
See what was decided
Every decision is chained with a SHA-256 hash. Nobody can modify the past. Ask the assistant: "what was decided about X?"
Key features

Built for real groups,
not ideal ones.

Neighborhood associations, cooperatives, indigenous communities, cultural collectives. People who need to decide together — without relying on any company.

Integrity

Immutable decision chain

Each decision includes a SHA-256 hash that depends on the previous one. Modifying any past decision invalidates the entire chain — every phone in the group detects it instantly.

Identity

Biometric verification

Your fingerprint or face never leaves your phone. The app only receives "authenticated" or "failed." No biometric data on any server — ever.

Sync

Real-time between phones

Yjs + WebRTC. When someone votes, all phones in the group update simultaneously. Works peer-to-peer — no central server stores your data.

Recovery

Social recovery with guardians

Lost your phone? Choose 3 trusted people in the group. If 2 of them scan a QR code in person, your account is restored instantly — no global vote required.

Legal

Right to erasure (Ley 29733)

The decision chain contains no personal data — only blind hashes. The layer linking hashes to real names lives locally on each phone, deletable at any time without breaking the mathematical integrity of the history.

Governance

Four vote types

Urgent (20% quorum), routine (25%), important (40%), constitutional (50%+1 with ⅔ majority). The app classifies automatically. No one needs to know the percentages.

Privacy levels

Your group chooses
how invisible it needs to be.

Each level is activated by group vote. No technical administrator can change it unilaterally.

1
Base
Vote and decision content encrypted. WireGuard included by default.
All groups · No cost
2
Noise
Continuous cover traffic hides who talks to whom and when. Observer sees constant encrypted flow.
Cover traffic · Slightly more electricity
3
Ghost
Server operates as a Tor Hidden Service. Physical location of the server is invisible — even to the technical operator.
Tor .onion · Initial configuration
4
Ownerless
Server key split between members using Shamir Secret Sharing. No single person controls it. Group meeting required to reconstruct.
Shamir 2-of-3 · One meeting

Dissociated identity architecture

The decision chain never contains names, IDs, or personal data. Only blind cryptographic identifiers. The layer linking hashes to real people lives locally on each phone.

If someone exercises their right to leave or erasure, their data is wiped from the local layer on all phones — without touching the mathematical seal of historical decisions.

// Decision chain (immutable)
hash: "a3f8c2d1e9b4..."
voter: "blind_hash_only"
choice: "yes"
 
// Local identity layer (mutable)
blind_hash"María Quispe"
// ↑ deletable. chain stays intact.
Interactive demo

See it working
before installing.

Full simulation of the app: create a group, propose, vote, view the decision record. No backend required — all data in the browser.

Open demo → Works on mobile · No install required

Install on
your Android.

Android 8.0+. Direct APK — no Play Store required. Enable "Unknown sources" in your phone settings before installing.

How to install:
1. Download the APK
2. Open the file from notifications
3. Allow "Install from unknown sources" if prompted
4. Open Comunidad
QR code
available when
app.kametsa.com
is live
Want to host your own server?
See the self-hosting guide →
Open source

Free to use, fork,
and self-host.

The base is open and free forever. Groups with budget can use managed hosting, priority support, or white-label instances. That's what sustains the project.

100%
Open source base
Full code on GitHub. MIT license. Deploy on your own server without asking permission.
$0
For members
No ads, no data sales, no freemium. Free means free. Costs covered by commercial services.
Sovereign
Your group's data belongs to your group. Move it, export it, delete it. No lock-in.
Get in touch

We're looking for two co-founders.

A technical profile with experience in PWA and distributed systems, and a commercial profile with existing relationships in the cooperative, NGO, or municipal ecosystem in Latin America.

We also want to hear from groups that need this tool — neighborhoods, cooperatives, collectives, indigenous communities.

⚙️
Technical co-founder
PWA · Distributed systems · AI-accelerated development
🤝
Commercial co-founder
Existing network in NGOs, cooperatives or municipalities
🏘️
Pilot group
10–200 people · Real collective decision need · Android phones
We respond within 48 hours.