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Business Instant Messaging

Siilo

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Panel rating · 6 judges · How to read the stars

Category median

Sovereignty: not determined

0–5 in half steps. 5 means the rubric's top anchor is met on the evidence.

by Siilo B.V. · siilo.com

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Add ?theme=dark to the image address for dark backgrounds. The badge shows the category and the month of the latest evaluation, and EU-Made where that is the product’s provenance. It never shows a score.

Siilo at a glance

Vendor
Siilo B.V.
Headquarters
Not stated on the vendor’s pages as of 20 Oct 2026
Data hosting
Not stated on the vendor’s pages as of 20 Oct 2026
Free plan
Not stated on the vendor’s pages as of 20 Oct 2026
Panel verdict
The AI panel rates Siilo 0.5/5, the mean of 6 judges. Siilo B.V., now called Doctolib Connect, is judged here as a free messenger for healthcare professionals plus a 'tailored solution' closed secure network for organisations, on a stated 10 M monthly messages from 1.2 M professional users and 225 K care organisations in Europe. how scores are made
As of
Vendor pages captured 20 Oct 2026; evaluated by the panel 21 Oct 2026. all sources

Siilo alternatives, European ones first →

Read this page as one judge. Each weighs the same scores by what they care about.

The Platform Engineer

Weighted verdict

Would rather run it than rent it, and wants to know whether that is a supported deployment or a hobby build. Cares about open protocols, federation, a plugin system with real permissions, and an upgrade path that does not orphan the customisations.

Same scores as the panel view — this lens weights them the way this judge cares.

Scored by The Platform Engineer

Panel median The Platform Engineer This judge’s scores over the panel median. Each label opens its reasoning below.
Scores per criterion, in stars out of 5
Criterion Panel median The Platform Engineer
Channels, threads & search 0.5 of 5 0.5 of 5
Encryption & access control 0.5 of 5 0.5 of 5
Retention, discovery & co-determination 0.5 of 5 0.5 of 5
Deployment & data custody 0 of 5 0.5 of 5
Integrations & extensibility 0 of 5 0 of 5
European sovereignty 1 of 5 1 of 5

Channels, threads & search

How this is scored

The daily surface: channel model, threading, mentions, files, and whether search can find a decision made eighteen months ago.

0 — Flat group chats with no threads; search covers recent messages only, and history is capped.

3 — Channels and direct messages with basic search, but threading is awkward or absent and file handling is a plain attachment list.

5 — Public and private channels, real threads, mentions and reactions, file sharing with previews, and full-text search across the whole history.

8 — Cross-organisation or guest channels with clear boundaries, message editing history, pinned and saved items, search with filters by channel, person and date, and a documented history limit or none at all.

10 — The archive is a working knowledge base: search that ranks well across years, threads that stay readable, channel lifecycle management (archive, rename, merge) without losing history, and export of a conversation in a form a human can read.

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The Platform Engineer

The captured site sells a "closed secure network" where an organisation's members can communicate, and that is the whole of what it says about the message surface. I found no public information on channels, threads, mentions, file handling, or search, let alone how a decision from eighteen months ago would be retrieved. 1

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Encryption & access control

How this is scored

What is encrypted and against whom, plus who can reach which room. Judged on documented mechanism, since "encrypted" in this category usually means the vendor holds the keys.

0 — Transport encryption only, undocumented; no role model beyond admin, guests indistinguishable from members.

3 — TLS and encryption at rest with vendor-held keys, basic roles, and guest access that mostly works.

5 — The above plus configurable roles per channel, SSO, guest accounts with scoped visibility, and a clear statement of what the vendor can read.

8 — Optional end-to-end encryption for direct messages or private rooms with the trade-offs named, device verification, session management an admin can revoke, and documented key handling.

10 — End-to-end encryption as a first-class mode — documented or open cryptography, cross-device key management that ordinary users survive, identity verification, and the vendor stating plainly what it cannot decrypt.

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The Platform Engineer

The page promises "Data security guaranteed" for clinical messaging and offers a processor agreement, but I found no public information on the encryption mechanism, who holds the keys, per-channel roles, SSO, or guest scoping. Judged on documented mechanism, nothing is documented. 1

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Retention, discovery & co-determination

How this is scored

The archive as a legal object: retention policies, export for discovery, audit, and the monitoring features a works council will ask to have switched off.

0 — No retention policy, no export beyond a manual copy, no audit log, and presence or activity analytics that cannot be disabled.

3 — Manual export of some data and a global history limit, but no per-channel retention, no audit log and no admin control over analytics.

5 — Configurable retention per channel or workspace, admin export in a documented format, an audit log of administrative actions, and status or presence that a user can control.

8 — Legal-hold and eDiscovery export including edits and deletions, retention executed per policy and evidenced, full admin audit trail, and activity analytics switchable off organisation-wide.

10 — Built to pass a works agreement and a subpoena on the same day: granular retention with documented deletion, discovery export a lawyer can use, complete audit, and no individual-level productivity scoring anywhere in the product.

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The Platform Engineer

A processor agreement is the one governance artifact on the captured site; I found no public information on retention policy, export formats for discovery, audit logging, or any switch for presence and activity analytics. Nothing here would survive a works council negotiation or a subpoena request as far as these pages show. 1

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Deployment & data custody

How this is scored

Whether the customer can hold their own archive: self-hosting, private cloud, open source, federation, and what an exit actually looks like.

0 — Cloud-only, proprietary, with export limited to a partial archive.

3 — Cloud-only, but with a documented full export in an open-ish format.

5 — A private-cloud or dedicated-instance option, or a self-hosted edition that lags the cloud significantly; full export documented.

8 — A genuine self-hosted edition close to feature parity, or open-source core with a documented upgrade path, plus complete export including files and metadata.

10 — Custody is the customer's: open-source or source-available server, self-hosting supported as a first-class deployment, open protocol or federation, and a migration path in and out that the vendor documents rather than resists.

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The Platform Engineer

Every deployment statement on the captured page describes a vendor-run service — a free clinician app plus a "tailored solution" for organisations — and I found no public information on self-hosting, source availability, full export, federation, or any open protocol. The rebrand to Doctolib Connect is exactly the moment I would want a written migration path, and I found no public information on that either. 1

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Integrations & extensibility

How this is scored

Bots, webhooks, app framework, identity — whether the chat becomes the place work is noticed, and whether that is buildable without a partner agreement.

0 — No API, no webhooks, no bots.

3 — Incoming webhooks and a handful of native integrations; no bot framework, no documented limits.

5 — Documented REST API, incoming and outgoing webhooks, slash commands, a bot account model, and SSO.

8 — A proper app framework with interactive components, event subscriptions with retries, SCIM provisioning, documented rate limits and a sandbox.

10 — A platform: versioned API with a deprecation policy, an app directory or plugin system with permissions a customer can audit, and integrations the vendor maintains rather than lists.

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The Platform Engineer

I found no public information on an API, webhooks, a bot or app framework, or identity provisioning on the captured page. An operator has nothing documented to build against, and no rate limits, sandbox, or directory to plan around. 1

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European sovereignty

How this is scored

Where the archive and its metadata live, who the contracting entity is, which subprocessors touch it. Independently sourced by the sovereignty pipeline; scored here as this buyer weighs it.

0 — Non-EU vendor and contracting entity, hosting unstated or non-EU, subprocessors unnamed.

3 — EU data residency offered for message content while metadata, search indexes or support tooling remain non-EU, or the contracting entity sits outside the EU.

5 — EU hosting as standard and an EU contracting entity, but parts of the chain — notifications, AI features, analytics — are non-EU without an explained safeguard.

8 — EU hosting on named infrastructure, EU contracting entity, full subprocessor list published, any non-EU processing named with its legal basis.

10 — Sovereign end to end and evidenced: vendor, entity, hosting and every subprocessor European, certification published, and a self-hosted option that removes the question.

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The Platform Engineer

The vendor entity is Siilo B.V. and the page counts "225 K care organisations in Europe", but I found no public information on where the archive is hosted, on the contracting entity after the rebrand to Doctolib Connect, or on a single named subprocessor. For a health-data product the only custody signal is a published processor agreement. 1

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Pricing transparency not rated — the vendor publishes no price

How this is scored

Whether a buyer can compute the annual invoice for their headcount — including the retention, compliance and guest features they actually need — from public pages alone.

0 — No public prices at all; every tier is a sales conversation.

3 — A per-user headline exists, but the tier where retention control, SSO or compliance export begins is unstated.

5 — Per-user prices public with billing period stated, but at least one commonly needed capability (unlimited history, SSO, eDiscovery) sits in an unpriced enterprise tier.

8 — Every tier priced publicly with per-user maths, history and storage limits, feature boundaries, minimum term and VAT treatment stated; self-hosted licensing priced too where offered.

10 — Complete price computability: annual invoice derivable for a given headcount and deployment choice, including guest users, storage and any per-instance licence.

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The Platform Engineer

The public price is "the free secure messaging solution for healthcare professionals" — zero for individual clinicians — while the organisational offering is described only as a "tailored solution". I found no public information on per-user prices, billing period, minimum term, or VAT treatment, so an operator cannot compute an annual invoice for their headcount from these pages. 1

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Questions about Siilo

Is Siilo European?

Not determined: the vendor’s pages as captured do not say where Siilo is based.

Where does Siilo store data?

Not stated on the vendor’s pages as of 20 Oct 2026.

Does Siilo have a free plan?

Not stated on the vendor’s pages as of 20 Oct 2026.

What are the best alternatives to Siilo?

As of 20 Oct 2026, the panel rates Element (3.5/5), Mattermost (3.5/5) and Stackfield (3/5) highest among the other 19 Business Instant Messaging products evaluated. Ratings that look equal are rounded to half stars; the order uses the unrounded rating, then the name. The highest-rated European alternative is Element (UK / wider Europe). Ratings are the AI panel’s opinion, formed from public evidence: how scores are made. The full list, with European products first: Siilo alternatives.

Where this could be wrong

What we left out

A claim that does not survive our checks costs us the claim, not the page. This is what was taken off this one.

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Sources (1)

The pages every claim on this page was read from — each one checked, dated, and kept verifiable.

  1. 1 Vendor page siilo.com Checked 20 Oct 2026 Details →