#51AFB8
Closest named color: Turquoise Blue (#06B1C4). oklch(70.1% 0.089 203.8), rgb(81, 175, 184).
Aa
Black text reads best on this color (8.17:1).
About this color
#51AFB8 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 70%, its chroma 0.089 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 8.17:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.17:1 |
| White text | 2.56:1 |
Values
| HEX | #51AFB8 |
| RGB | rgb(81, 175, 184) |
| HSL | hsl(185, 42%, 52%) |
| OKLCH | oklch(70.1% 0.089 203.8) |
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 #51AFB8 | 2.56:1 | Fails | Lc -55.2 | Large or bold text, headings |
| Black text on #51AFB8 | 8.17:1 | AAA | Lc 54.0 | Large or bold text, headings |
| #51AFB8 text on white | 2.56:1 | Fails | Lc 50.0 | Large or bold text, headings |
| #51AFB8 text on black | 8.17:1 | AAA | Lc -51.9 | 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
#C2E0E2
oklch(88.5% 0.032 201.5)
-
Step 300
300
#96CCD1
oklch(81% 0.056 203.3)
-
Step 400
400 (this color)
#51AFB8
oklch(70.1% 0.089 203.8)
-
Step 500
500
#009CA7
oklch(63.1% 0.108 203.6)
-
Step 600
600
#00838D
oklch(55.6% 0.095 204.2)
-
Step 700
700
#006E76
oklch(49.1% 0.084 203.6)
-
Step 800
800
#005A61
oklch(42.6% 0.073 204)
-
Step 900
900
#004B51
oklch(37.6% 0.064 204)
-
Step 950
950
#002D31
oklch(27.1% 0.046 204.1)
#51AFB8 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) | #A3A8B9 | 0.090 |
| Deuteranopia (no green cones) | #939CB8 | 0.083 |
| Tritanopia (no blue cones) | #00B5B2 | 0.037 |
| Achromatopsia (no color) | #A1A1A1 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AFB8
#51AFB8
oklch(70.1% 0.089 203.8)
- #D18984
#D18984
oklch(70.2% 0.089 23.9)
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 #51AFB8, 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 0.037
- Topaz #13BBAF ΔE 0.048
- Greyblue #77A1B5 ΔE 0.049
- Cadet Blue #5F9EA0 ΔE 0.050
- Bluegrey #85A3B2 ΔE 0.056
- Greeny Blue #42B395 ΔE 0.059
- Dull Teal #5F9E8F ΔE 0.064
Use #51AFB8 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.