#51ACDF
Closest named color: Turquoise Blue (#06B1C4). oklch(71% 0.114 236.1), rgb(81, 172, 223).
Aa
Black text reads best on this color (8.31:1).
About this color
#51ACDF is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.114 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.058 away. Black text reads best on it, at 8.31:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.31:1 |
| White text | 2.52:1 |
Values
| HEX | #51ACDF |
| RGB | rgb(81, 172, 223) |
| HSL | hsl(202, 69%, 60%) |
| OKLCH | oklch(71% 0.114 236.1) |
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 #51ACDF | 2.52:1 | Fails | Lc -54.3 | Large or bold text, headings |
| Black text on #51ACDF | 8.31:1 | AAA | Lc 54.7 | Large or bold text, headings |
| #51ACDF text on white | 2.52:1 | Fails | Lc 49.3 | Large or bold text, headings |
| #51ACDF text on black | 8.31:1 | AAA | Lc -52.7 | 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
#DDECF6
oklch(93.5% 0.021 236.8)
-
Step 200
200
#C1DEF0
oklch(88.5% 0.04 235.2)
-
Step 300
300
#94C8E9
oklch(80.8% 0.072 236.7)
-
Step 400
400 (this color)
#51ACDF
oklch(71% 0.114 236.1)
-
Step 500
500
#0094D0
oklch(63.1% 0.136 236.2)
-
Step 600
600
#007CAF
oklch(55.5% 0.12 236.1)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#51ACDF 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) | #94ABE1 | 0.069 |
| Deuteranopia (no green cones) | #809DDE | 0.057 |
| Tritanopia (no blue cones) | #00B9BD | 0.078 |
| Achromatopsia (no color) | #A3A3A3 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51ACDF
#51ACDF
oklch(71% 0.114 236.1)
- #D88E57
#D88E57
oklch(71.1% 0.115 56.2)
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 #51ACDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.058
- Deep Sky Blue #00BFFF ΔE 0.061
- Greyblue #77A1B5 ΔE 0.065
- Cornflower Blue #6495ED ΔE 0.071
- Chefchaouen Blue #4895EF ΔE 0.074
- Bluegrey #85A3B2 ΔE 0.076
- Vivid Sky Blue #4CC9F0 ΔE 0.078
- Carolina Blue #8AB8FE ΔE 0.080
Use #51ACDF 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.