#31BEE9
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.8% 0.129 223.8), rgb(49, 190, 233).
Aa
Black text reads best on this color (9.67:1).
About this color
#31BEE9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.129 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.032 away. Black text reads best on it, at 9.67:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.67:1 |
| White text | 2.17:1 |
Values
| HEX | #31BEE9 |
| RGB | rgb(49, 190, 233) |
| HSL | hsl(194, 81%, 55%) |
| OKLCH | oklch(74.8% 0.129 223.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #31BEE9 | 2.17:1 | Fails | Lc -46.9 | Large or bold text, headings |
| Black text on #31BEE9 | 9.67:1 | AAA | Lc 61.7 | Content text, not long reading |
| #31BEE9 text on white | 2.17:1 | Fails | Lc 42.2 | Non-text elements, placeholder text |
| #31BEE9 text on black | 9.67:1 | AAA | Lc -60.0 | Large or bold text, headings |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 400.
-
Step 50
50
#EEF7FB
oklch(97.1% 0.011 226)
-
Step 100
100
#DAEEF6
oklch(93.7% 0.024 223.7)
-
Step 200
200
#BAE0EF
oklch(88.4% 0.045 223.8)
-
Step 300
300
#85CCE7
oklch(80.8% 0.081 224.1)
-
Step 400
400 (this color)
#31BEE9
oklch(74.8% 0.129 223.8)
-
Step 500
500
#0098BE
oklch(63.1% 0.118 223.7)
-
Step 600
600
#0080A0
oklch(55.7% 0.104 223.4)
-
Step 700
700
#006B87
oklch(49% 0.092 224)
-
Step 800
800
#00586F
oklch(42.7% 0.08 223.4)
-
Step 900
900
#00495D
oklch(37.7% 0.071 223.8)
-
Step 950
950
#002B39
oklch(26.9% 0.051 225.5)
#31BEE9 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #A6BAEB | 0.101 |
| Deuteranopia (no green cones) | #8EA8E9 | 0.089 |
| Tritanopia (no blue cones) | #00CBCC | 0.065 |
| Achromatopsia (no color) | #B0B0B0 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31BEE9
#31BEE9
oklch(74.8% 0.129 223.8)
- #F09168
#F09168
oklch(74.7% 0.128 43.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #31BEE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.032
- Vivid Sky Blue #4CC9F0 ΔE 0.036
- Bright Sky Blue #02CCFE ΔE 0.042
- Turquoise Blue #06B1C4 ΔE 0.062
- Lightblue #7BC8F6 ΔE 0.064
- Dark Turquoise #00CED1 ΔE 0.066
- Aqua Blue #02D8E9 ΔE 0.073
- Sky #82CAFC ΔE 0.076
Use #31BEE9 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.