Top 5 Cassidy AI Alternatives (2026)

Cassidy AI has built a credible product: it connects your company’s knowledge bases to AI assistants and workflow automations, ships a dedicated Microsoft Teams Add-In — rare in this market — and backs it all with SOC 2 Type II certification. For a US company that wants grounded assistants without a data-science team, it is a reasonable choice. So why do so many teams, especially in Europe, search for a Cassidy AI alternative in 2026?

Four reasons dominate, and the first usually decides the matter on its own:

• No EU data residency. Cassidy claims GDPR compliance, but it runs on US infrastructure with no EU hosting option. For a European company, that turns every prompt containing personal data into a GDPR Art. 44–49 transfer question your data protection officer has to answer — and a certification is not a transfer mechanism. If you typed “Cassidy alternative GDPR” into a search box, this list was written for you.
• Static knowledge grounding. Cassidy’s assistants answer from the knowledge bases you upload and connect. What you feed it is what it knows. It does not learn from how your company actually works — no knowledge accumulates on its own, and stale uploads produce stale answers.
• Assistants only react. You ask; Cassidy answers. It does not watch your company’s signals, does not surface what needs your attention, and does not prepare work before you request it.
• Quote-based pricing. Budgeting starts with a sales call, not a price list — which makes comparing offers harder than it should be.

In fairness: that Teams Add-In is a genuine differentiator — most AI platforms ignore Microsoft Teams entirely. But an add-in bolted onto Teams is not the same as living there, as the first entry below makes clear.

Here are the five alternatives worth shortlisting in 2026, each with its genuine strengths and honest limitations. For a direct head-to-head, see amaiko vs Cassidy AI.

1. amaiko — proactive AI with a memory, native in Teams

Cassidy offers a Teams Add-In. amaiko goes further: it is Teams-native. One Teams chat — no separate interface, no rollout project, no training sessions. You add it, you start typing, and onboarding is done. For companies whose daily work already happens in Microsoft Teams, the difference between an add-in and a native presence shows up every single day.

The deeper difference, though, is what happens to knowledge.

Cassidy grounds its assistants in what you upload. amaiko builds a persistent corporate memory that learns on its own. It absorbs how your company works — projects, customers, decisions, preferences — and keeps that knowledge across every conversation. Nothing to upload, nothing to re-sync, nothing that goes stale because someone forgot to refresh a knowledge base. Where Cassidy’s grounding is static, amaiko’s memory accumulates: every interaction makes the next one more useful.

That memory feeds a self-learning agent network: specialized AI agents that handle email, meetings, research and company systems, and that improve from how your organization actually operates. Underneath run state-of-the-art models — not a single fixed model quietly ageing behind the brand.

And amaiko acts proactively. It does not wait for a prompt. It surfaces what needs your attention, prepares your day, and follows up on what would otherwise slip — the entire category of assistance that Cassidy’s ask-and-answer assistants structurally do not attempt.

Then there is the reason most European buyers arrive at this page: compliance. amaiko hosts 100% in Germany with ISO 42001-compliant AI management — no US infrastructure, no Art. 44–49 transfer analysis, no CLOUD Act exposure for your data protection officer to wrestle with. Details on the security page.

Pricing is public: from €19.92 per user per month, billed annually — see pricing. No sales call required to know what it costs.

One honest caveat: if your primary use case is building bespoke knowledge-base assistants and workflow automations for a US organization, Cassidy serves that well, and its SOC 2 Type II posture fits the US compliance world. amaiko is built for a different buyer — the Teams-centric European company that wants AI to remember, act ahead, and stay on German soil.

Best for: Teams-centric companies in Europe — especially the German Mittelstand — that need GDPR-clean AI with persistent memory and proactive intelligence. You can book a demo to see it in your own tenant.

2. Dust — the European agent platform

Dust is the most technically comparable alternative on this list. The French platform — founded by ex-OpenAI and ex-Stripe people, backed by Sequoia — deploys department-level AI assistants connected to your company data: Slack, Google Drive, Notion, Confluence, GitHub. It offers native Teams integration, SOC 2 certification with zero data retention agreements with model providers, and — crucial for anyone leaving Cassidy over data residency — a selectable EU hosting region. At around $29 per user per month for Pro, it also publishes its prices.

The limitations: Dust assistants are configured, not self-learning — no persistent corporate memory builds on its own, and every interaction is user-initiated, with no proactive push. Deployment is an IT project: connectors, permissions and assistant design need configuration before value shows up. And EU hosting is an option you select, not the default you stand on.

Full comparison: amaiko vs Dust.

3. Glean — enterprise search at enterprise prices

Glean answers a different question than Cassidy: not “build me an assistant” but “find it for me.” It indexes more than 100 workplace tools — including a Teams connector — and for large organizations drowning in scattered knowledge, its enterprise search is genuinely powerful.

Three things get in the way for the typical Cassidy-leaver. Pricing starts at $50+ per user per month with enterprise-only commitments that run into six figures annually — a steep step up from anything else on this list. The platform runs on US cloud infrastructure, which is precisely the GDPR problem you were trying to escape. And search is not assistance: Glean finds documents; it does not prepare your morning, draft your follow-ups, or act on what it finds.

Full comparison: amaiko vs Glean.

4. Onyx — open-source, self-hosted, your rules

Onyx (formerly Danswer) takes the most radical route to compliance on this list: it is open-source under an MIT license, self-hostable, model-agnostic, and ships 40+ connectors including Teams. Host it in your own German data center and the GDPR Art. 44–49 question does not get answered — it disappears. Cloud hosting runs $20 per user per month; self-hosted is free. It markets itself, with justification, as the GDPR-friendly self-hostable Glean alternative.

The honest price is engineering effort. Deploying and maintaining Onyx is your IT team’s job — updates, scaling, connector upkeep, model wiring. You become your own vendor. And like Glean, it is search-and-assistant, not an autonomous layer: reactive, no persistent organizational memory, no proactive delivery. For a company with a capable DevOps team and a hard data-sovereignty requirement, that trade can be worth it. For everyone else, it is a second job.

Full comparison: amaiko vs Onyx.

5. Lindy — the proactive personal assistant

Lindy deserves credit for one thing few tools attempt: it is genuinely proactive — at the individual level. It manages your inbox, meetings and calendar ahead of you, learns your writing style, offers a no-code agent builder with hundreds of app integrations, and is reachable via SMS, iMessage and voice. As a personal executive-assistant replacement, it is conceptually the closest thing on this list to “AI that acts before you ask.”

The limitations are structural. Lindy is an individual-user tool in an enterprise costume: it learns your preferences and builds no shared organizational memory. It has no Microsoft Teams presence whatsoever — email, SMS and web app only. At $49.99 per month per person, team-wide deployment gets expensive with no rationally scaling team pricing. And for European companies it is a hard stop: US-based with no EU region disclosed, GDPR compliance publicly contested by its own user community, and no public DPA — the exact problem you are leaving Cassidy over, in sharper form.

Full comparison: amaiko vs Lindy.

How to choose

Match the tool to your situation, not to the demo:

• You are a European company on Microsoft Teams and the GDPR question must be closed, not managed: choose amaiko. 100% German hosting, ISO 42001, Teams-native, persistent self-learning memory and proactive intelligence — from €19.92 per user per month, on a public price list.
• You want configurable departmental assistants with model choice and a selectable EU region: Dust is the most capable agent platform here — if you have the IT capacity to configure it and accept that it only acts when asked.
• Your core problem is finding information across 100+ tools and you have an enterprise budget and no EU-residency requirement: Glean.
• You have a strong engineering team and an absolute data-sovereignty mandate: Onyx, self-hosted on your own infrastructure — full control, full responsibility.
• You want a proactive personal assistant for yourself, work outside Teams, and have no EU data constraints: Lindy.

And in fairness to Cassidy: for a US organization that wants knowledge-base assistants with a Teams Add-In and SOC 2 paperwork, it remains a sensible choice. The real question for a European buyer is simpler and harder: can you defend US infrastructure to your data protection officer at all? If the answer is no, the Cassidy AI alternative you need is not a similar product with better marketing — it is one where the data residency question never comes up.