Kirill Abrams

Kirill Abrams's personal blog

Founder & CEO, UmbrellaX TOO

This is where I write about end-to-end encryption, post-quantum cryptography, jurisdictional risk, and the design decisions behind UmbrellaX. Personal opinions, not press releases.

More about me .com

Private messaging briefings

I compare private messengers by phone number identity, metadata exposure, end-to-end encryption defaults, backups, jurisdiction, and usable scale.
What I cover
  • messenger without phone number
  • private messenger metadata
  • secure WhatsApp alternative
  • Telegram alternative encrypted by default
A hand holding a small SIM card beside a smartphone, representing phone number identity in private messaging.
Phone number

Messenger without phone number: privacy case

A founder's guide to phone numbers as identity, why they expose more than message content, and why UmbrellaX does not start from a telecom identifier.

May 21 guide 5 min New
Abstract red network with black and white nodes connected by clean geometric lines.
Private messaging

UmbrellaX vs SimpleX: private messaging, no identifiers, and usable scale

SimpleX is radical about no identifiers. UmbrellaX is stronger as a default private messenger for groups, recovery, speed, jurisdiction, and normal use.

May 18 comparison 5 min New
Hand holding a dark smartphone at night, with warm lights in the background.
Private messaging

UmbrellaX vs WhatsApp: private messaging without Meta or phone number identity

UmbrellaX is stronger than WhatsApp for private messaging when Meta ownership, phone number identity, metadata, backups, and jurisdiction matter.

May 18 comparison 5 min New
Abstract blueprint of two network topologies, a centralised red hub and spoke pattern and a distributed gold mesh, facing each other on a dark navy background.
Private messaging

UmbrellaX vs Session: two answers to the no phone number question

UmbrellaX and Session both refuse phone number identity. Session went random Account IDs, onion routing, decentralised. UmbrellaX went MLS, post quantum, Kazakhstan. Five axes compared honestly.

May 10 comparison 5 min New
Abstract red network graph with interconnected nodes on a black background, evoking cryptographic protocol structure.
Private messaging

UmbrellaX vs Signal: honest comparison by the founder of UmbrellaX

UmbrellaX outperforms Signal on groups, jurisdiction, phone number independence, and scale. Signal has a longer legacy record, but UmbrellaX is stronger for my threat model.

Apr 28 comparison 5 min New
Abstract black and white grid of cipher glyphs evoking encoded message structure.
Private messaging

UmbrellaX vs Telegram: encryption by default, jurisdiction, and private messaging

UmbrellaX encrypts every chat end to end by default; Telegram does not. UmbrellaX runs from Kazakhstan, Telegram from the UAE after a French arrest. Concrete comparison by the founder of UmbrellaX.

Apr 28 comparison 5 min New