#31BCD5
Closest named color: Turquoise Blue (#06B1C4). oklch(73.5% 0.118 212.9), rgb(49, 188, 213).
Aa
Black text reads best on this color (9.28:1).
About this color
#31BCD5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.118 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.040 away. Black text reads best on it, at 9.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 9.28:1 |
| White text | 2.26:1 |
Values
| HEX | #31BCD5 |
| RGB | rgb(49, 188, 213) |
| HSL | hsl(189, 66%, 51%) |
| OKLCH | oklch(73.5% 0.118 212.9) |
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 #31BCD5 | 2.26:1 | Fails | Lc -49.0 | Large or bold text, headings |
| Black text on #31BCD5 | 9.28:1 | AAA | Lc 59.8 | Large or bold text, headings |
| #31BCD5 text on white | 2.26:1 | Fails | Lc 44.2 | Non-text elements, placeholder text |
| #31BCD5 text on black | 9.28:1 | AAA | Lc -58.0 | 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
#EEF7F9
oklch(97% 0.01 212.5)
-
Step 100
100
#DBEEF2
oklch(93.6% 0.021 211.8)
-
Step 200
200
#BBE1E9
oklch(88.5% 0.041 211.9)
-
Step 300
300
#87CEDD
oklch(81% 0.074 212.4)
-
Step 400
400 (this color)
#31BCD5
oklch(73.5% 0.118 212.9)
-
Step 500
500
#009AB1
oklch(63% 0.11 213.1)
-
Step 600
600
#008295
oklch(55.7% 0.097 212.5)
-
Step 700
700
#006D7E
oklch(49.1% 0.086 213.3)
-
Step 800
800
#005967
oklch(42.6% 0.075 213)
-
Step 900
900
#004A56
oklch(37.6% 0.066 213)
-
Step 950
950
#002C34
oklch(26.9% 0.047 213.2)
#31BCD5 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) | #A9B6D6 | 0.107 |
| Deuteranopia (no green cones) | #93A5D5 | 0.098 |
| Tritanopia (no blue cones) | #00C6C4 | 0.045 |
| Achromatopsia (no color) | #ACACAC | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31BCD5
#31BCD5
oklch(73.5% 0.118 212.9)
- #E98C78
#E98C78
oklch(73.3% 0.118 33)
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 #31BCD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.040
- Vivid Sky Blue #4CC9F0 ΔE 0.052
- Dark Turquoise #00CED1 ΔE 0.053
- Topaz #13BBAF ΔE 0.059
- Deep Sky Blue #00BFFF ΔE 0.060
- Bright Sky Blue #02CCFE ΔE 0.064
- Light Sea Green #20B2AA ΔE 0.065
- Medium Turquoise #48D1CC ΔE 0.068
Use #31BCD5 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.