Solo2 Pro
Professional messaging with GDPR compliance by design. Communication with clients that you can defend in a proceeding.
Request pilotThe problem with professional WhatsApp
Talking to clients through messaging designed for friends opens three fronts at once:
Sensitive data outside your control
Client data crosses servers in jurisdictions you don't control and companies whose business model is based on exploiting metadata. Content encryption doesn't prevent knowing who talks to whom, when, and from where.
Conversations challengeable as evidence
A WhatsApp screenshot is trivially alterable. Without a verifiable timestamp or chain of custody, defending the content of a conversation in a proceeding is difficult.
GDPR responsibility that scales poorly
As a professional, you are responsible for the processing of client data. If a leak occurs in a channel over which you have no technical control, the responsibility remains yours — and so do the AEPD sanctions.
Solo2 Pro is built so there is no conversation to save
It's not an encryption layer over a traditional architecture. It's a different architecture:
Point-to-point without an intermediate server
Messages travel directly between your device and the client's. Our server only facilitates the initial encounter — like a switchboard that connects a call and then withdraws. Once the connection is established, we are no longer in the middle.
Trivial GDPR compliance by construction
We cannot leak what we don't store. There are no sub-processors with access to content, no cloud copies, no transfers to third countries. GDPR is complied with not by procedure but by architecture.
Technical audit available
Encryption uses X3DH and Double Ratchet — the same primitives as Signal, validated by the academic community. The infrastructure is documented and reviewable. Your IT specialist can verify what we say.
For your sector
Confidentiality obligations change depending on the profession. We adapt the language and cases to yours:
Accounting and consulting firms
Tax, labor, and economic client data without passing through third-party servers. Demonstrable GDPR compliance.
See moreLaw firms
Defensible professional secrecy (art. 542 LOPJ). Communication with clients that withstands a proceeding.
See moreDoctors and clinics
Health data (art. 9 GDPR) with medical secrecy technically respected, not just declared.
See moreSpecific features for professionals
On top of standard messaging, Solo2 Pro adds what changes the daily life of a firm:
Corporate banner
Your logo and an editable message visible at the top of the client's chat. Clearly identifies your professional channel.
Color-coded labels per tunnel
Organize your tunnels with local labels (criminal, civil, VAT, urgent, closed…). Instant filters. Only on your device, never on the client's.
Document broadcast to multiple tunnels
Send the same circular or notice to a selected group of clients, with individual confirmation. No visible groups or cross-metadata.
Professional signature at the footer
Your professional identity at the end of each message. Configurable once, always present.
Selective conversation export
Export the history with a specific client in the date range you need, in an auditable format. Useful for files, evidence of due diligence, or legal requirements. The file does not leave your device until you decide where to save it.
Pricing
No long contracts. No card for the trial. No surprises in the bill.
Individual
For professionals working on their own.
Firm (up to 10 users)
For small and medium firms. 4.90 €/equivalent user.
30-day trial period without a card. If it doesn't fit your work, you don't pay.
How to start
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1
Write to us about your case
Sector, firm size, what specific problem you are trying to solve. No long form: an email to pro@solo2.net is enough.
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2
We configure the tunnels with your clients together
We accompany you in the first connections so you and your team can see the real flow. The client only needs to install Solo2 — no previous accounts, no phone numbers.
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3
30-day trial with real clients
Without paying anything. If at the end of the month you see it has replaced professional WhatsApp, you stay. If not, we just stop.
Frequently asked questions
Is it valid as evidence in a proceeding?
Selective export generates a file with technical chain of custody (chained hashes, local timestamp). It is more robust than a WhatsApp screenshot, although the final assessment always rests with the judge. We do not sell official stamps we don't have.
Does it comply with GDPR for specially protected data (health, sensitive economic data)?
By design: we cannot leak what we don't store. There are no sub-processors with access to content. Transfer is direct between devices. For data under Art. 9 GDPR (health) it is especially relevant as it eliminates the chain of responsibility over third-party providers.
How do I migrate current chats with my clients?
They are not migrated. Solo2 Pro starts fresh. It's a conscious decision: WhatsApp history is already where it is, importing it to Solo2 would not make it more private retroactively. You can keep WhatsApp in parallel during the transition.
What if the client doesn't want to install another app?
Solo2 works as a Progressive Web App (PWA): it opens in the browser, without going through the App Store or Google Play. It's a link, not a download. For a client, installing Solo2 is simpler than creating an account in any service.