No cloud. No compromise. No risk.

Your clients.Your machine.Nobody else's.

ShadowOS is a CRM and call notetaker that lives entirely on your device. Client notes, timelines and follow-ups, with no server in between.

Join the waitlistSee how it works
GDPR compliant by design
Data never leaves your system
No account required to start
Works fully offline
Workspace
Contacts 47
Calls 31
Deals 12
Calendar
Nudges 3 new
Tags
Active clients 18
Warm leads 9
Past clients 20
All data local
Contacts
All
Active
Overdue
MH
Markus Hoffmann
Rechtsanwalt · Frankfurt
Active
2d ago
SB
Sophie Bauer
Financial advisor
Active
5d ago
TK
Thomas Klein
Consultant · Berlin
Warm
18d ago
LM
Laura Müller
Steuerberaterin
Active
Today
RW
Robert Wagner
Architect · Köln
Quiet
61d ago
MH
Markus Hoffmann
Rechtsanwalt · Kanzlei Hoffmann & Partner · Frankfurt
Active clientCorporate lawReferral source
3.2y
Relationship
€42k
Total value
4
Referrals
AI nudge: Markus mentioned a Hamburg office expansion in your Jan 14 call. Good moment to follow up on the new entity structure proposal.
Timeline
Mar 23, 2026
Email — Q2 scope confirmed
Approved revised scope document for restructuring.
Mar 18, 2026
Call — Hamburg expansion
Discussed Hamburg office. He'll review with his partner.
Feb 28, 2026
Note — personal
Son started university in Heidelberg. Good to mention.
Jan 14, 2026
Deal closed — retainer renewal
€1,800/mo renewed. Third consecutive year.
Log call⌘L

Why we built ShadowOS

Everynoteyouwriteaboutaclientisapromise.Theonlyquestioniswhoelsegetstoreadit.

The problem

HubSpot was built for sales teams, not for you.

Your client data on their servers
Every deal, note, and contact detail you enter into Salesforce or HubSpot lives on their US cloud. For lawyers, advisors, and therapists — that's a professional risk, not just a preference.
Built for teams of 50, not solo
You're paying for collaboration features, admin panels, and enterprise workflows you'll never use. The tools made for one person either cost nothing and do nothing, or cost €200/mo and take weeks to set up.
GDPR anxiety is real
Post-Schrems II, European professionals are legally exposed using US-based cloud tools for client data. The compliance add-ons cost more than your whole software budget. There had to be a better way.

Take the notes while you're still on the call.

A notetaker is built into ShadowOS. Press ⌘L from anywhere, type or record what was said, and the notes are filed on the timeline of everyone who was on the call.

Goes to both timelines
⌘LAlways one keystroke away
A small pill sits at the bottom of every screen. Open it from a contact's page and that person is already added to the call.
EscLook something up, keep your draft
Minimise the sheet to check an old email or another contact. Your notes stay exactly where you left them until you save or discard.
⌘↵One call, every timeline
Add everyone who took part and the notes are saved to each of them. Leave it empty for a meeting that isn't about anyone in particular.

Rather listen than type? Record the call and ShadowOS transcribes it on your machine. The audio never leaves it.

Everything a CRM should do. Nothing it shouldn't.

Designed for professionals who manage 20–20,000 high-value relationships and can't afford to be careless with their clients' trust.

Know the whole history before you pick up the phone.

Every call, note and email sits on one timeline per contact. A language model running on your own machine reads it and writes a two-sentence summary, so you can catch up in the ten seconds before a call.

The model is bundled with the app. Nothing is sent to an AI provider.

Your client list is a file on your disk.

ShadowOS keeps everything in one file on your own disk, encrypted with a key that lives in your operating system's keychain. No account, no server, and it works on a plane. A copy of the file is unreadable without that key.

Encrypted with AES-256-GCM. We never see the key or the data.

Quick enough to use while the client is still talking.

Everything you do often has a shortcut, and the app opens straight to your contacts. Log a call, add a note or jump between views without reaching for the mouse.

Press ⌘/ in the app to see every shortcut.

Also in ShadowOS

Smart relationship nudges
AI notices you haven't contacted an important client in 60 days and surfaces the right moment to reconnect. It also remembers the details you logged — "his son started university" — so you never go into a call cold.
Private deal pipeline
Track proposals, retainers, and projects through custom stages. Revenue forecasting that never touches the internet. Export to PDF for your own records or accountant.
Opt-in encrypted backup
When you're ready, enable end-to-end encrypted cloud backup. Only you hold the key — even if our servers were breached, your data is unreadable. Peace of mind without surrendering control.
Email + calendar sync — local
Parse your inbox and calendar locally to auto-log contact history. No emails are uploaded — all processing happens on your machine. You get the automation without the exposure.

Who it's for

Made for professionals who handle sensitive relationships.

If a data breach would cost you a client — or your licence — ShadowOS was built for you.

Lawyers & Notaries
Client confidentiality isn't optional. Track matters, deadlines, and case history without any data leaving your office.
"I couldn't use HubSpot. My clients trust me with their most sensitive legal matters."
Financial Advisors
Manage portfolios, track client goals, and log every conversation — with the same discretion your clients expect from their assets.
"Finally something I can actually use that won't get me a call from our compliance officer."
Consultants & Coaches
Your client list is your most valuable asset. Keep their strategies, challenges, and context in a tool that only you can access.
"My clients are CEOs. They'd leave if they knew their strategy was in a US cloud database."
Therapists & Doctors
Track session notes, treatment history, and relationship context — fully offline, fully private, fully under your control.
"Patient data on a US cloud was never an option. This is the first tool that makes sense."
0
bytes sent to external servers
100%
offline capable
GDPR
compliant by architecture
E2E
encrypted optional backup

Your clients trusted you with their secrets.
Honour that.

Join professionals who manage client relationships without compromising confidentiality.

Privacy by architecture, not by policy.

Join the waitlistSee full feature list →