#51B2BC
Closest named color: Turquoise Blue (#06B1C4). oklch(71% 0.092 204.5), rgb(81, 178, 188).
Aa
Black text reads best on this color (8.44:1).
About this color
#51B2BC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 71%, its chroma 0.092 and its hue 204°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.031 away. Black text reads best on it, at 8.44:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.44:1 |
| White text | 2.48:1 |
Values
| HEX | #51B2BC |
| RGB | rgb(81, 178, 188) |
| HSL | hsl(186, 44%, 53%) |
| OKLCH | oklch(71% 0.092 204.5) |
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 #51B2BC | 2.48:1 | Fails | Lc -53.7 | Large or bold text, headings |
| Black text on #51B2BC | 8.44:1 | AAA | Lc 55.4 | Large or bold text, headings |
| #51B2BC text on white | 2.48:1 | Fails | Lc 48.6 | Large or bold text, headings |
| #51B2BC text on black | 8.44:1 | AAA | Lc -53.4 | 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
#F0F7F8
oklch(97.1% 0.008 207.1)
-
Step 100
100
#DEEDEF
oklch(93.6% 0.016 206.4)
-
Step 200
200
#C2E0E3
oklch(88.6% 0.032 204)
-
Step 300
300
#95CCD2
oklch(80.9% 0.057 204.5)
-
Step 400
400 (this color)
#51B2BC
oklch(71% 0.092 204.5)
-
Step 500
500
#009CA8
oklch(63.2% 0.108 204.4)
-
Step 600
600
#00838D
oklch(55.6% 0.095 204.2)
-
Step 700
700
#006E77
oklch(49.1% 0.084 204.7)
-
Step 800
800
#005A62
oklch(42.7% 0.073 205.3)
-
Step 900
900
#004B51
oklch(37.6% 0.064 204)
-
Step 950
950
#002D31
oklch(27.1% 0.046 204.1)
#51B2BC 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) | #A5ABBD | 0.091 |
| Deuteranopia (no green cones) | #959FBC | 0.084 |
| Tritanopia (no blue cones) | #00B8B5 | 0.037 |
| Achromatopsia (no color) | #A4A4A4 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B2BC
#51B2BC
oklch(71% 0.092 204.5)
- #D58B85
#D58B85
oklch(71.1% 0.092 24.7)
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 #51B2BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.031
- Light Sea Green #20B2AA ΔE 0.040
- Topaz #13BBAF ΔE 0.045
- Greyblue #77A1B5 ΔE 0.053
- Cadet Blue #5F9EA0 ΔE 0.059
- Bluegrey #85A3B2 ΔE 0.059
- Greeny Blue #42B395 ΔE 0.061
- Bluey Grey #89A0B0 ΔE 0.067
Use #51B2BC 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.