Using the app

Accessibility features

Screen reader names for every key, keyboard use, a high-contrast skin, key tooltips and 15 languages.

Open in Trident

Trident aims to work for everyone, including students who use screen readers, keyboards, switch control, zoom or high-contrast settings.

1. Spoken names: every key and control has a spoken name, such as "square root", "negative", "second function" or "answer". Screen readers announce the result when you finish a calculation.
2. Key tooltips: hover over a calculator key for about half a second, or press and hold it on a touch screen, to see what each layer of that key does (its main function and its second or alpha function).
3. Keyboard: type on a physical keyboard instead of tapping keys. Focus is always visible. See the keyboard shortcuts guide.
4. Contrast: open Settings and choose the High Contrast skin. Under App appearance choose Light, Dark or System.
5. Size: the app follows browser zoom and your system text size.
6. Language: choose from 15 languages in Settings. Arabic uses a right-to-left layout.
7. There are no time limits, except the optional exam practice timer that you start yourself.

Tips

• Known gaps are listed on the Accessibility page of the website. Graphs have no spoken description yet, but the table view lists the values.
• If something gets in your way, use the contact details on the Accessibility page. It helps to say your device and app version.

Related guides

• Change skins, dark mode and display optionsPick a calculator skin, choose light or dark appearance, and switch display options like pixel-accurate graphs.
• Type with your computer keyboardOn a computer, tablet keyboard or Chromebook, you can type numbers, operators and common functions instead of tapping the keys.
• Change the app languageTrident is available in 15 languages. Change it in Settings; it applies at once.