Call Protection · Calling with the handshake

Multi-layered spam protection with Calmido Phone

  • Every call carries a risk score, so you instantly know how trustworthy the caller is
  • Automatically block known spammers with the community blocklist
  • Share and receive reports from the Calmido community
  • Call with confidence thanks to the unique handshake verification
  • Works on iOS and Android
Calmido Screener

The essence

Calmido handshake protocol illustration

Calls in and out, we're always connecting with 'the handshake'

The handshake verifies both parties before a call connects. Spoofing fails. Impersonation fails. The verification is open, governed by the independent TARIDE foundation, and works on top of the existing phone networks - no carrier change required.


You stay in control of your own identity. Approve who can see you. Lock your account. If your phone is stolen, calls from your number are flagged as suspicious until you unlock it.

The Caller Card

Sarah Kuijpers de Jong

+31 6 12345678 · The Netherlands

A verified Calmido member

Matteo Restaurant Rotterdam

Mario Andretti

+31 20 1234567 · The Netherlands

A business, verified by public data

Anonymous

+31 6 12345678 · The Netherlands

A trusted member who's chosen to stay private

Locked member

+31 6 12345678 · The Netherlands

A member whose account is currently locked

Reported caller

+31 6 12345678 · The Netherlands

A number reported by the community

Unknown caller

+31 6 12345678 · The Netherlands

An unknown caller - no history yet

Know and show who's calling

Caller card archetypes. One simple language.

Every caller you see in Calmido lands on a card - designed so you can read the truth at a glance.


Behind the scenes, a small set of card archetypes covers the situations you'll meet: a verified member, a business pulled from public business data, a privacy-protected caller who stays anonymous, a community-reported number, plus states for locked or unknown accounts. Each archetype is tuned to a real-world situation, so you always know what you're looking at.

Protect your number - build your card

Together we stand strong

Powered by the community.

The Calmido community is thousands of users who fight spam together. By reporting and reviewing numbers, you help not only yourself but also everyone else.

  • iOS, Android, Web - every channel, one community. Wherever you call from, you stay protected.
  • Tech catches the pattern. People catch the new trick. Algorithms can't recognise something they've never seen - but you can.
  • A real member behind every report. No anonymous noise - that's why the data stays trustworthy.
  • Search a number. Reverse-search a name. Both directions, both one tap away.
  • You're protected because someone else reported. Pass it on - your next flag saves the next caller.
Help and become a member!

iOS · Android · Web

Three channels.
One layer of protection.

iOS and Android carry the full Calmido protection layer on the phone itself. The Web Directory adds lookup and reporting from any browser. Pick the channel you use most — your protection follows you.

iOSAndroidWeb
Call Protection
Caller ID on card
Number search / Look up
Reporting
Default Dialer Appbeta

beta Android users: set Calmido as your default dialer. Every call goes through the handshake - no extra steps, no app switching.

Get it on Google Play

Anonymous vs Private

Privacy is in our DNA.

Anonymous

+31 6 12345678 · The Netherlands

Hide your identity

Show as Anonymous. Your name stays hidden; the number is visible. The handshake still verifies you, so the recipient knows you're a trusted Calmido member.

Sarah Kuijpers de Jong

Hidden · The Netherlands

Hide your number

Withhold caller ID. Your number doesn't show on the recipient's screen - but your registered name still travels through the handshake.

Privacy by Design

Zero knowledge. Nothing to leak.

We don't store your data - because we don't have it.

Calmido is built around a simple rule: what we don't have can't be leaked. Calmido never collects or stores:

  • Call content,
  • Call metadata,
  • Contact data,
  • Or any other personal or sensitive data.

The only personal data we keep is your email address and phone number, both fully hashed. We don't own any private keys; they never pass through our services. The verification layer is governed by the independent TARIDE foundation - not by us.

How we earn that trust

Coming soon

Where the handshake goes next.

The protocol is a foundation. We're already building the things that sit on top of it.

01

Member-to-member VoIP

Encrypted calls between Calmido members. A European answer to WhatsApp - no metadata, no Meta. The handshake is the proof-of-identity layer; VoIP rides on top.

02

Guardian accounts

Family-level protection. Set up a guardian for your kids, your parents, anyone who shouldn't have to deal with scam-calls alone. The guardian sees alerts; the guarded user gets a calmer phone.

03

TARIDE for businesses

Companies attest to their own numbers, employees, and logo on the open protocol. Even people without Calmido see verified business calls - on any handshake-compatible phone.

How we differ

Calmido vs the rest.

Plenty of apps screen calls. Few of them are open, European, and built around an independent verification protocol. Here's the side-by-side.

CalmidoGoogle PhoneHiyaTruecaller
Open verification protocolpartial
Cross-platform (iOS + Android + Web)
European-hosted
No PII storedpartial
Community-powered
Post-Quantum ready
Freepartialpartial
Ad-freepartial
Independent governance (not Big Tech)
  • Hosted in EuropeFounded in Amsterdam · Built and run from the EU · KVK 96388455
  • Latest industry standardsPost-Quantum ready · No passwords · Full passkey support
  • Powered by open protocolsGoverned by the independent TARIDE foundation
  • No PII leaves your phoneNothing uploaded · Nothing sold · Free forever