SingingNumbers

Last updated: [To be filled before publishing]
Publisher: ZADIO EOOD, registered in the Republic of Bulgaria (EU). Registered office: Ploshtad Han Kubrat 1, Ruse, Bulgaria.
Contact: app@zadio.bg

Summary

We want SingingNumbers to be usable by everyone, including people who rely on screen readers, large text, high contrast, reduced motion, or keyboard navigation. This statement describes what we currently do, our voluntary compliance target, and how to reach us if something isn’t working for you.

Scope

This statement covers:

• The SingingNumbers Android app (app.singingnumbers.app), and
• This website, zadio.bg/singingnumbers, including the Privacy Policy, Terms of Service, and this Accessibility Statement.

Conformance target

We voluntarily align with the Web Content Accessibility Guidelines (WCAG) 2.1, Level AA across the website, and with the mobile-software requirements of EN 301 549 (the European harmonised standard for ICT accessibility, Chapter 11) for the Android app.

We do not claim full WCAG 2.2 AAA or full EN 301 549 conformance certification.

What the app currently supports

• TalkBack labels on every actionable control.
• Polite live-region announcements when the calculator display changes, when playback starts, and when an error appears.
• System font scaling — the app respects your Android Font size and Display size settings (including the largest options).
• Dark theme independent of the system setting, plus Android 12+ Material You dynamic colour.
• No biometric gates, no captchas, no time limits — nothing the app does requires sight, fine motor precision, or hearing within a fixed window.
• No information conveyed by colour alone — every musical highlight, button state, and error is also signalled by shape, position, icon, or text.
• Audio is never the sole channel — everything the app sings is also rendered visually on the display.
• Self-describing multi-digit notes in Big Calculator mode (e.g. [10]) so a screen reader reads each note unambiguously.

What this website supports

• A "Skip to main content" link as the first focusable element on every page.
• A high-contrast focus ring around every link, button, and form control when navigating with a keyboard.
• Semantic HTML (proper headings, landmarks, lists, and <details>/<summary> disclosures).
• A prefers-reduced-motion media-query block that suppresses transitions and smooth scrolling for visitors who ask their OS to reduce motion.
• Light and dark themes via prefers-color-scheme, both meeting WCAG 2.1 AA contrast for body text and UI components.
• A fluid layout that responds to browser zoom up to 200% and to mobile viewports without horizontal scrolling.
• Every image carries a descriptive alt attribute; purely decorative graphics are marked as such.

Known limitations

We are a small publisher and we cannot guarantee a perfect experience in every assistive-technology combination. Known limitations as of the last update:

• The calculator’s melody playback is intentionally audio-first. Deaf and hard-of-hearing users see the same information visually (highlighted digits during playback) but do not experience the “singing” feature itself.
• The Material You dynamic-colour palette is generated by the Android system and inherits whatever contrast the user’s wallpaper produces. The app’s built-in light and dark themes provide a guaranteed-contrast alternative.
• Long expressions in the display scroll horizontally; TalkBack announces the full string regardless.

If you run into a barrier that is not listed here, please report it (see “Feedback” below) — we will treat it as a bug.

Our legal posture

This is a voluntary statement. To the best of our analysis, SingingNumbers is not currently subject to mandatory accessibility legislation:

• The European Accessibility Act (Directive (EU) 2019/882, transposed in Bulgaria by the Law on Accessibility Requirements for Products and Services, State Gazette issue 31/2025, in force 28 June 2025) lists six consumer service categories that fall in scope — electronic communications, audiovisual media, passenger transport, consumer banking, e-books, and e-commerce. A free, offline calculator with no in-app purchases, no subscriptions, no ads, and no consumer contract is not a covered service. In addition, ZADIO EOOD qualifies as a microenterprise under EAA Article 3(23), which is fully exempted from accessibility obligations by EAA Article 4(5).
• The Americans with Disabilities Act (ADA) is a US federal statute. ZADIO EOOD has no US operations, employees, or US-targeted commerce.

We make these statements in good faith based on the current structure of the app and the company. We commit to maintain and improve accessibility regardless of whether the law changes — both because it is the right thing to do and because retrofitting accessibility is more expensive than building it in.

Feedback

If you encounter an accessibility barrier in the app or on this website, please tell us:

• By email: app@zadio.bg (we read every message).
• Please include the device model, Android version, assistive technology in use (TalkBack, Switch Access, Voice Access, etc.), and a short description of what failed.

We aim to respond within 10 business days.

How we maintain accessibility

Internally:

• Every new app feature passes the per-feature accessibility checklist (TalkBack manual pass, Accessibility Scanner clean, contrast verified, font scaling up to the largest system setting, animations-disabled flow verified).
• The website is checked against WCAG 2.1 AA at every release touching index.html or style.css.
• The store-listing copy and this statement are reviewed together — if the app loses a claimed feature, both are updated in the same release.

Thank you for using SingingNumbers.