Accessibility Statement

This statement covers the lytris learning platform and the lytris website, operated by Lytris GmbH, Schönbuchstraße 15/1, 74172 Neckarsulm, Germany.

Lytris GmbH provides this statement as a contractual commitment to its university customers, structured on the information items of Annex 3 no. 1 of the German Accessibility Strengthening Act (BFSG) and on EN 301 549. The German version of this page is authoritative; this English page is a translation.

lytris is a learning platform for university mathematics. Students read course materials, work through exercise sheets and quizzes, ask an AI tutor questions in a chat, and receive feedback on submitted work. Lecturers manage courses, create and grade exercises, and publish materials.

lytris is built against the Web Content Accessibility Guidelines (WCAG) 2.1 level AA as harmonised in EN 301 549. The platform is partially conformant: it meets the requirements except for the known limitations listed below.

• Perceivable: all interface colours meet the AA contrast ratios in light and dark theme, every image, icon button and generated visual carries a text alternative, formulas are exposed as MathML, text scales to 200 percent and reflows at 320 pixels without loss of content.
• Operable: every function is operable with the keyboard alone, without traps; each page starts with a skip link, has one title heading and a logical heading outline; focus is visible and managed on navigation and in dialogs.
• Understandable: every form control has a visible label, required fields are marked, input errors are named in text next to the field and receive focus; pages declare their language.
• Robust: the interface uses valid ARIA checked automatically in continuous integration; status messages, the streaming AI answer and grading results are announced to assistive technology.

The following parts of the service are not fully accessible. For each we describe an alternative and, where one exists, the planned fix.

Documents uploaded by lecturers (scripts, exercise sheets, exams) may be scanned PDFs without a text layer, which screen readers cannot read.

• Workaround: Exercises and course content are also available as accessible HTML on the course pages and in the chat. The upload dialog asks lecturers for PDFs with real, selectable text.

PDFs generated by the platform (exercise sheets, feedback exports, billing summaries) contain real text, a document title and a language, but no PDF/UA structure tags yet, so reading order inside the PDF is heuristic for assistive technology.

• Workaround: The same content is available as accessible HTML in the application.
• Planned fix: Planned with the next upgrade of the PDF engine, which supports tagged PDF (PDF/UA-1).

Mathematical formulas are exposed as MathML. VoiceOver (Safari, Chrome on macOS) and JAWS read them natively; NVDA requires the free MathCAT add-on to speak formulas.

• Workaround: Install MathCAT for NVDA, or use VoiceOver or JAWS.

The handwriting input (drawing formulas on a canvas) has no non-visual equivalent.

• Workaround: The math input field and plain text input provide the same functionality with keyboard and screen-reader support.

Sign-in (Hanko) and payment (Stripe) use third-party interfaces whose accessibility we do not control.

• Workaround: Both providers publish their own accessibility conformance. Contact us if you are blocked while signing in or paying and we will assist.

Course content written in a language other than the page language is not always marked as such, so a screen reader may use the wrong voice for it.

• Workaround: Switch the reading language manually in the screen reader.

If you encounter a barrier on lytris, or need content in an accessible form, contact us at accessibility@linity.one or by post at Lytris GmbH, Schönbuchstraße 15/1, 74172 Neckarsulm, Germany. We reply within 14 days.

The market surveillance authority for the accessibility of products and services in Germany is the Marktüberwachungsstelle der Länder für die Barrierefreiheit von Produkten und Dienstleistungen (MLBF), Magdeburg, www.mlbf-barrierefrei.de.

This statement is based on a self-assessment by the Lytris engineering team, carried out from 2026-09-07 to 2026-09-12.

• Automated axe-core scans of every public route in light and dark theme, plus deterministic checks (headings, landmarks, language, focus, reflow), running as a blocking gate on every code change.
• A manual keyboard-only audit of the representative user journeys.
• Screen-reader tests with VoiceOver (Safari and Chrome on macOS) and NVDA (Chrome on Windows).
• Zoom tests at 200 and 400 percent and reflow tests at 320 pixel width.