Attio vs Sellsy 2026

Attio wins this 4.0 to 3.4, and the gap is real. The Notion-like interface meant 15 G2 reviewers described it as intuitive and elegant; first custom object setup ran about 15 minutes in our tests, and Gmail sync was 3 clicks. Filtering 50k+ records happens in milliseconds with no lag. The flip side: advanced automation workflows are not intuitive. Multiple reviewers spent 2+ hours getting conditional triggers right, and the “too flexible” problem is real, two people on our team were lost for three months on lists and attributes because Attio doesn’t work like a typical Salesforce or HubSpot.

Sellsy took 2–3 hours for initial pipeline and template configuration in our SMB client tests. The interface is functional but feels slightly dated next to modern SaaS tools. The team of 4 needed 45 minutes for basics, then two additional sessions for advanced features. Navigation between modules (CRM, invoicing, projects) requires multiple clicks. Where Sellsy earns its score: quote and invoice creation is genuinely smooth with ready-to-use templates, and the 360° client view is well-organised. Not a tool that overwhelms, but also not the fastest to master.

Attio takes this 4.0 to 3.2, primarily because of the genuine free plan. Attio Free covers 3 seats, 50k records, real data enrichment, and email sync, no credit card required. For a 5-person team on Attio Plus (annual), the bill lands at $145/month ($1,740/year). Annual vs monthly saves $420/year on that team.

Sellsy has no free plan. The minimum entry is 2 users on an annual commitment. The Sales+Invoicing bundle (the most relevant plan for most buyers) starts at €49/user/month Standard or €89/user/month Evolution. A 5-person Evolution team pays €445/month (€5,340/year), roughly three times Attio Plus for the same headcount. Sellsy justifies this with integrated e-invoicing, electronic signature (saves a separate DocuSign subscription), and French-language support. For a French company with mandatory invoicing, the bundle math changes: Attio Pro at $345/month (5 users) plus a separate PA tool at ~€42/month (3 users × €14) totals about €234/month, cheaper than Sellsy Evolution at €267/month for 3 users, but you manage two tools.

The honest catch on Attio: the dual credit-pool billing (seat credits for Ask-Attio AI queries, workspace credits for automations) can force an earlier-than-expected Pro upgrade for AI-heavy teams on the Plus plan. The catch on Sellsy: the 2-user minimum eliminates solo operators and freelancers entirely.

Attio edges this 4.5 to 4.2, and the gap comes down to data-model flexibility and AI depth. The custom object system (up to 10 custom objects on Pro) lets teams model any business process, on a recent client project, we built 8+ linked objects: Deals, Accounts, Contacts, Partnerships, Investors, and Product Features. Filtering 1M+ records on Pro happens in milliseconds. The MCP server launched in 2026 gives AI agents (Claude, ChatGPT, Cursor) direct read and write access to CRM data via natural language, at 100 reads/sec and 25 writes/sec. No other CRM at this price bracket has an equivalent.

Sellsy’s feature depth is genuinely impressive for commercial management. The three pillars, 360° client database, commercial tracking, electronic document creation with e-signature, are production-tested. We configured 15+ custom fields for a B2B client, built 3 pipelines (inbound, outbound, upsell), and tested electronic signature with 5 clients who all signed in under 10 minutes. Sellsy’s killer feature that Attio simply cannot touch: DGFiP PA approval for France’s e-invoicing mandate. From September 1, 2026, large and mid-sized French companies must emit Factur-X or UBL invoices via an approved platform. Sellsy is one; Attio is not.

Where Sellsy falls short: marketing automation is basic compared to HubSpot or ActiveCampaign, and the Sellsy AI unlimited add-on (available from Evolution) is described in our tests and the in-repo reviews as recent and less mature than competitors.

Sellsy wins this 4.1 to 3.8, and for French-market buyers the gap feels wider in practice. Sellsy support responded to 4 of our test queries in 4–6 hours by email, always in French, always with actionable solutions. Live chat on Evolution+ tested at under 10 minutes wait. Phone support exists on higher plans. Personalised onboarding on Evolution and Elite is genuinely useful: a 1-hour call with a Sellsy expert to configure pipelines and custom fields meaningfully accelerates adoption for teams with no CRM background. The critical differentiator: everything is in French, with local advisors, no offshore routing.

Attio typically responds within 12–24 hours via email on paid plans. No live chat on Free or Plus. No phone unless you are on Enterprise. G2 reviewers are consistent: “I didn’t think that the client support was great at all”; “only gave us the Attio 101 course”; teams left on their own for months on lists and attributes. The documentation is well-structured with video tutorials and the knowledge base covers most common questions, but for non-technical teams needing hand-holding, the async-only model stings. The community is growing (Slack, forum) but smaller than HubSpot or Salesforce by a wide margin.

Attio takes this 4.2 to 3.9 on the strength of the MCP server, a category first. The ~50 native integrations plus Zapier (5,000+ apps) and a well-documented REST API with webhooks cover most workflows. But the real differentiator is the MCP server launched in 2026: AI agents running on Claude, ChatGPT, or Cursor can create contacts, update deal stages, and run CRM reports without leaving the AI assistant. Rate limits are 100 reads/sec and 25 writes/sec, usable in production. We wired it up in one afternoon on a client project. No other CRM in this price bracket has this.

Sellsy offers 100+ native integrations with genuine depth in the French business ecosystem: Aircall (click-to-call, call logging), Stripe and PayPal (payment reconciliation), Pennylane and Sage (pre-accounting export), Order Invoicer (Shopify, WooCommerce, PrestaShop sync), Zapier and Make. The honest gaps: no native Slack notifications, limited social media integrations, and the API is only accessible from the Evolution tier, requiring technical skills for custom builds. Sellsy wins on count (100+ vs 50), Attio wins on extensibility and AI-native reach.