#51ACEA
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.5% 0.125 241.4), rgb(81, 172, 234).
Aa
Black text reads best on this color (8.43:1).
About this color
#51ACEA is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.125 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.054 away. Black text reads best on it, at 8.43:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.43:1 |
| White text | 2.48:1 |
Values
| HEX | #51ACEA |
| RGB | rgb(81, 172, 234) |
| HSL | hsl(204, 78%, 62%) |
| OKLCH | oklch(71.5% 0.125 241.4) |
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 #51ACEA | 2.48:1 | Fails | Lc -53.7 | Large or bold text, headings |
| Black text on #51ACEA | 8.43:1 | AAA | Lc 55.4 | Large or bold text, headings |
| #51ACEA text on white | 2.48:1 | Fails | Lc 48.6 | Large or bold text, headings |
| #51ACEA text on black | 8.43:1 | 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
#F0F7FC
oklch(97.2% 0.01 238.5)
-
Step 100
100
#DDECF8
oklch(93.5% 0.023 241.9)
-
Step 200
200
#C1DDF4
oklch(88.4% 0.044 243)
-
Step 300
300
#93C8EF
oklch(81% 0.078 240.8)
-
Step 400
400 (this color)
#51ACEA
oklch(71.5% 0.125 241.4)
-
Step 500
500
#0092DA
oklch(63.1% 0.148 241.4)
-
Step 600
600
#007BB8
oklch(55.7% 0.13 241.1)
-
Step 700
700
#00679B
oklch(49.1% 0.115 241)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002942
oklch(26.9% 0.063 241.6)
#51ACEA 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) | #90ADED | 0.064 |
| Deuteranopia (no green cones) | #7B9DE9 | 0.052 |
| Tritanopia (no blue cones) | #00BBC1 | 0.090 |
| Achromatopsia (no color) | #A4A4A4 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51ACEA
#51ACEA
oklch(71.5% 0.125 241.4)
- #DB8F49
#DB8F49
oklch(71.4% 0.126 61.1)
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 #51ACEA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.063
- Chefchaouen Blue #4895EF ΔE 0.067
- Turquoise Blue #06B1C4 ΔE 0.072
- Carolina Blue #8AB8FE ΔE 0.073
- Vivid Sky Blue #4CC9F0 ΔE 0.079
- Greyblue #77A1B5 ΔE 0.079
- Dark Sky Blue #448EE4 ΔE 0.084
Use #51ACEA 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.