#51ACDB
Closest named color: Turquoise Blue (#06B1C4). oklch(70.8% 0.11 233.9), rgb(81, 172, 219).
Aa
Black text reads best on this color (8.27:1).
About this color
#51ACDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.110 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.053 away. Black text reads best on it, at 8.27:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.27:1 |
| White text | 2.53:1 |
Values
| HEX | #51ACDB |
| RGB | rgb(81, 172, 219) |
| HSL | hsl(200, 66%, 59%) |
| OKLCH | oklch(70.8% 0.11 233.9) |
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 #51ACDB | 2.53:1 | Fails | Lc -54.6 | Large or bold text, headings |
| Black text on #51ACDB | 8.27:1 | AAA | Lc 54.5 | Large or bold text, headings |
| #51ACDB text on white | 2.53:1 | Fails | Lc 49.5 | Large or bold text, headings |
| #51ACDB text on black | 8.27:1 | AAA | Lc -52.5 | 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
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DEECF5
oklch(93.5% 0.019 235.7)
-
Step 200
200
#C1DEEF
oklch(88.5% 0.039 233.6)
-
Step 300
300
#94C9E7
oklch(80.9% 0.07 233.6)
-
Step 400
400 (this color)
#51ACDB
oklch(70.8% 0.11 233.9)
-
Step 500
500
#0095CC
oklch(63.1% 0.132 233.7)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004865
oklch(37.8% 0.079 233.7)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#51ACDB 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) | #95AADD | 0.070 |
| Deuteranopia (no green cones) | #829CDA | 0.061 |
| Tritanopia (no blue cones) | #00B8BC | 0.073 |
| Achromatopsia (no color) | #A2A2A2 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51ACDB
#51ACDB
oklch(70.8% 0.11 233.9)
- #D68D5C
#D68D5C
oklch(70.7% 0.11 53.9)
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 #51ACDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.053
- Greyblue #77A1B5 ΔE 0.061
- Deep Sky Blue #00BFFF ΔE 0.064
- Bluegrey #85A3B2 ΔE 0.071
- Cornflower Blue #6495ED ΔE 0.075
- Bluey Grey #89A0B0 ΔE 0.077
- Chefchaouen Blue #4895EF ΔE 0.078
- Vivid Sky Blue #4CC9F0 ΔE 0.079
Use #51ACDB 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.