LUIGI AI Alternatives: The 5 Best AI Options for Tax Firms (2026)

The best LUIGI AI alternative for a German tax firm is amaiko Kanzlei. It gives you answers from DATEV without copying DATEV, runs in Microsoft Teams instead of yet another application, and costs a flat €29.91 per user per month.

Why firms look for an alternative in the first place is on LUIGI’s own public pages:

• Your DATEV data, mirrored. The security page lists a sub-processor for “mirroring the DATEV holdings into the LUIGI databases”. LUIGI’s blog states the principle: “LUIGI reads every document in advance.”
• A box in the post. Step four of the onboarding is the “LUIGI Connect package — the hardware for securely connecting your firm’s systems”. Configuration follows, then loading the DATEV data, “usually a few days”, then staff training.
• A price that grows with your archive. On top of the request pool (€300 to €1,000 a month, labelled as guide prices) comes the DATEV add-on: one-off from €500 plus €5 per 1,000 files, then from €250 a month, “tiered by the size of your holdings”.
• One more window. LUIGI is a separate web application. Microsoft Teams does not appear on LUIGI’s public pages, and Microsoft 365 only as “mail and calendar as a data source”.

Here are five alternatives, each with what it means for a tax firm. The head-to-head is at amaiko vs LUIGI AI.

1. amaiko Kanzlei: DATEV on request, sealed, right in Teams

amaiko Kanzlei is amaiko’s edition for tax firms, and it turns LUIGI’s architecture around. It asks DATEV when someone on your team asks, and keeps no mirror of your data:

• Rechnungswesen: postings, balances (SuSa) and accounts. amaiko uploads a Buchungsstapel only after you confirm it, and never finalizes it.
• Lohn: read-only, from gross and net per employee to the official payroll reports as PDF.
• DMS: finds and reads documents, and writes only after you approve a plan.
• Haufe: tax and HR-law answers from Haufe’s content, using your firm’s own Haufe access.

Each person signs in with their own DATEV login. DATEV operations go to DATEV, DMS traffic passes through the Cloud Gateway for DATEVconnect by Riecken, and the question goes to Haufe when you use Haufe.

amaiko sets the Kanzlei seal when it provisions your workspace, in its infrastructure, and your data protection officer can verify it: only allowlisted specialists, read-only Microsoft 365, personal knowledge only, no background reading, no content in notifications, agent traces or logs, no web research, no image generation. The AI runs only via Azure OpenAI inside the EU, hosted in Germany on amaiko’s own infrastructure. The data processing agreement carries the confidentiality clauses of § 203 StGB and § 62a StBerG.

And amaiko Kanzlei lives where your firm already works: in Microsoft Teams. It reads and drafts across email, calendar, files, Office documents, Teams chats, OneNote, To Do and SharePoint lists, and it remembers how each person works. No hardware, no data import, no activation fee. The price: €29.91 per user per month billed annually. A 10-person firm pays €3,589.20 in year one; with LUIGI it is €12,492, by LUIGI’s own calculator at 500,000 DMS files.

Best for: any tax firm on Microsoft 365 that wants answers from DATEV without handing a vendor a copy of its client files. Book a demo and ask amaiko Kanzlei your own questions.

2. SOFI AI: strong technology, still in beta

SOFI AI, based in Krailling, has the strongest security architecture in this niche: inference runs on open-weights models inside a Trusted Execution Environment with remote attestation. We acknowledge that. SOFI connects DATEV through DATEVconnect and covers more of Microsoft 365 than LUIGI, plus an Outlook add-in.

For your firm, though: SOFI for Tax is still a closed beta with a waiting list, by its own product page. SOFI is its own web and iOS app, not Teams. And getting in is expensive: a €399.99 or €649.99 monthly base fee, plus €19.99 per user, plus a one-off €3,499.99 for setup and onboarding. A 10-person firm lands in the Medium edition (10 to 49 users) at €849.89 a month and €13,698.67 in year one. With amaiko Kanzlei it is €3,589.20.

The full comparison: amaiko vs SOFI AI.

3. Microsoft 365 Copilot: in Teams, but no DATEV

Copilot is already in Teams, Outlook and Word, at $30 per user per month on top of a qualifying Microsoft 365 licence.

For a tax firm the essential part is missing: Copilot brings no DATEV connection of its own, so your client data stays out of reach until someone builds and maintains a connection. And Copilot’s flex routing can process AI outside the EU, in the US, Canada or Australia. It is on by default for EU tenants created after March 25, 2026; existing tenants have to check Message Center post MC1269223 and opt out. Under § 203 StGB, that is a setting someone in your firm has to answer for. amaiko Kanzlei processes only inside the EU, with no switch to forget.

The full comparison: amaiko vs Microsoft 365 Copilot.

4. Langdock: many models, no DATEV connection

Berlin-based Langdock offers many models behind one interface, hosted in Germany and the EU, at €25 to €99 per user per month.

For your firm, that means: Langdock has no DATEV integration of its own. To connect DATEV you plug in a third-party MCP server, maintain that connection yourself, and bring one more service provider to your client data, one your firm must select carefully and bind under § 62a StBerG. Langdock is a separate app outside Teams and waits for someone to open it.

The full comparison: amaiko vs Langdock.

5. meinGPT: a Mittelstand platform without a DATEV connector

meinGPT, from SelectCode GmbH in Unterhaching, hosts in Germany and the EU and offers chat, assistants and workflows on one platform.

For your firm, that means: DATEV is not among meinGPT’s 16 direct connectors (as of September 27, 2026). By its pricing page the licence costs €18 per user per month billed annually (1 to 50 users) and includes no model costs; those come on top as a budget. Work happens in meinGPT’s own platform, not in the chat your team already has open in Teams.

The full comparison: amaiko vs meinGPT.

How to decide

Ask every vendor three questions. Will you hold a copy of our DATEV data afterwards? Where does my team use the tool? What does it cost in year three, once our archive has grown? amaiko Kanzlei’s answers: no copy, in Microsoft Teams, €29.91 per user per month, same as year one. Book a demo.