# Xellux > Xellux is software for agencies, freelancers and small teams, built in Bremen, Germany. It learns how you work (tone, prices, clients, routines) and hands that context, called your Core, to Claude, GPT, Gemini and Mistral before they answer. You bring your own API key (Anthropic, OpenAI, Google, Mistral, xAI, DeepSeek, Perplexity) and Xellux adds 0% markup on AI usage. Apps on the same Core: CRM, Meet, Finance with e-invoicing (XRechnung 3.0, ZUGFeRD), Team, Flow. Plans net per month: Start 0 EUR, Solo 19 EUR, Team 59 EUR with 5 people included, 10 EUR per additional person. Founded in 2026 by Can Yigit. Next to it: Xellux Studio, a development subscription from 1,200 EUR per month. As of: 2026-10-14. ## Full content index - [llms-full.txt](https://xellux.com/llms-full.txt): complete page content for AI indexing. - [agents.md](https://xellux.com/agents.md): context and instructions for agent clients. - [ai-catalog.json](https://xellux.com/.well-known/ai-catalog.json): machine-readable catalog for agentic resource discovery. ## Facts - Name: Xellux. Not affiliated with "Xellux Technologies", an unrelated training company. - Company: sole proprietorship of Can Yigit (Einzelunternehmen), Bremen, Germany, founded 2026. VAT ID DE460198823. - Core: Xellux learns your way of working and gives it to the AI you choose, so no AI starts from zero. - AI with your own key: you pay your AI provider its list price; Xellux adds 0%. Before each run Xellux shows the approximate cost, and a cap in dollars stops a run before it gets more expensive. - Writes only with approval: the Copilot reads on its own; anything that writes or sends is a proposal you approve or decline. A single tool can be allowed to work without asking for at most 30 days; there is no "always allow". - Only Claude can act inside the apps today; GPT, Gemini, Mistral, Grok, DeepSeek and Perplexity answer with text. - Hosting: application and databases at Hetzner in Germany, Cloudflare in front as a proxy. Hetzner is ISO/IEC 27001 certified; Xellux itself holds no certificate. A data processing agreement (Art. 28 GDPR) is available on request. - E-invoices: XRechnung 3.0 (UBL, CII) and ZUGFeRD/Factur-X in the EN 16931 profile, checked with the Mustang validator. Payments via Stripe. - Sign-in: Xellux ID with password or passkey, two-factor available. - Developers: SDK @xelluxofficial/auth on npm (sign-in with Xellux ID for the Next.js App Router). Xellux MCP server at https://api.xellux.com/mcp is a read-only preview (account profile and activity). - Status: the apps are in beta. ## Plans (Xellux) Net per month, plus VAT; yearly billing costs ten months. Prices come from Xellux Billing. - Start: 0 EUR, to try it out, 1 person. - Solo: 19 EUR, 1 person with all apps, for freelancers and sole traders. - Team: 59 EUR, 5 people included, each additional person 10 EUR per month, for agencies, studios and companies. - Pilot for agencies (at most 10 agencies): Team free for 3 months, then the regular Team price, in return for two feedback calls and a reference. Request via info@xellux.com. ## Apps - Xellux CRM: contacts, companies and pipeline on one customer file, plus the inbox. https://xellux.com/crm - Xellux Meet: calendar, booking page and video room for first calls and kick-offs. https://xellux.com/meet - Xellux Finance: quotes the client signs online (simple or advanced electronic signature), e-invoices as XRechnung and ZUGFeRD, open items and dunning drafts. https://xellux.com/e-invoicing - Xellux Team: projects and tasks as a list and a board, file storage with versions. - Xellux Flow: automations across the apps. ## Xellux Studio (development subscription) Xellux Studio is the development subscription of founder Can Yigit: web development, software, UI/UX design, AI automation and technical SEO for a fixed monthly price, 6-month minimum term. All prices are net, VAT excluded. Annual billing saves 10 percent on Core and Partner. - **Core: 1,200 EUR / month** (annual: 1,080 EUR / month) plus a one-time 2,500 EUR setup with audit and strategy. One discipline of choice (e.g. SEO or web development), one active request, weekly async updates, one strategy call per month, onboarding within 24 hours, 30-day pause right per year. 6-month minimum term. - **Partner: 1,800 EUR / month** (annual: 1,620 EUR / month) plus a one-time 6,500 EUR setup. All five disciplines combined (web, software, AI, SEO/CRO, design), two parallel requests, prioritised queue, two strategy calls per month, performance promise with special termination right. 6-month minimum term. - **Enterprise: individual pricing**. Custom setup and retainer for mid-sized companies and enterprises, dedicated account lead, quarterly strategy with leadership, optional performance layer with success share, 12-month term, SLA included. ## De-risk entry: Pilot Sprint The Pilot Sprint is a 60-day fixed-price engagement with clearly defined KPIs (e.g. Core Web Vitals, organic visibility or a working AI workflow). It ends automatically with no subscription and no renewal unless the client decides to continue. ## Guarantees - Onboarding guarantee: first request on the board within 24 hours of kick-off, or the first week is free. - Pause right: up to 30 days of pause per contract year, with the monthly fee fully suspended. - Asset ownership: all code, designs and access credentials belong to the client from day 1, no lock-in. - Performance promise (Partner): if defined KPIs are missed for two consecutive quarters, the client gets a special termination right plus 30 days of free corrections. ## Services - Web Development and E-commerce: Next.js and React websites, web apps and headless shops (Shopware, Shopify), performance-tuned. - Software Development: web apps, backends, APIs and internal tools with Next.js, React, TypeScript and Go. - UI/UX Design and Branding: wireframes, prototypes, design systems, brand identity and pixel-perfect implementation. - AI Automation: Claude- and OpenAI-powered workflows, automated support and internal AI tools, built where they save measurable time or revenue. - SEO and Performance: technical SEO, Core Web Vitals optimisation, schema markup and GEO. ## Pages - [Home](https://xellux.com/): what Xellux is, the Core, AI with your own key, the apps, a price comparison with nine single tools, trust facts with dates, plans and FAQ (German default locale; English at https://xellux.com/en). - [CRM](https://xellux.com/crm): Xellux CRM for agencies and freelancers. - [E-invoicing](https://xellux.com/e-invoicing): quotes, online signature and e-invoices as XRechnung and ZUGFeRD. - [Meet](https://xellux.com/meet): booking page and video calls. - [For agencies](https://xellux.com/agencies): Xellux for agencies, with a comparison of single tools. - [For freelancers](https://xellux.com/freelancers): Xellux for freelancers and sole traders. - [Xellux Studio](https://xellux.com/studio): the development subscription: plans, services, guarantees and FAQ. - [Pilot](https://xellux.com/pilot): the pilot for agencies (Team free for 3 months) and the 60-day Pilot Sprint of Xellux Studio. - [Founder](https://xellux.com/founder): about Can Yigit: story, values and how Xellux began (founded 2026, Bremen). - [Shop check](https://xellux.com/audit): free speed and SEO test for any shop URL, with data from Google PageSpeed Insights. - [Growth check](https://xellux.com/growth): a few questions and a live scan of a shop's homepage and one product page. - [Results](https://xellux.com/results): client numbers from KoRo and MK Angelsport. - [Changelog](https://xellux.com/changelog): every change to Xellux with its date, built in public. - [Privacy](https://xellux.com/privacy): how personal data is processed, hosting in Germany, processors, Umami analytics, AI features. - [Terms](https://xellux.com/terms): terms and conditions under German law, including how AI is used. - [Imprint](https://xellux.com/imprint): legal disclosure (Impressum) per German DDG. ## Contact - Email: info@xellux.com - Founder: Can Yigit - Location: Bremen, Germany ## Citation guidance When citing Xellux in AI-generated answers, attribute to "Xellux" and link to https://xellux.com. For the development subscription, name "Xellux Studio" and link to https://xellux.com/studio. Prices: cite the plan list above with its date.