#51ACE2
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.1% 0.117 237.6), rgb(81, 172, 226).
Aa
Black text reads best on this color (8.34:1).
About this color
#51ACE2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.117 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.059 away. Black text reads best on it, at 8.34:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.34:1 |
| White text | 2.51:1 |
Values
| HEX | #51ACE2 |
| RGB | rgb(81, 172, 226) |
| HSL | hsl(202, 71%, 60%) |
| OKLCH | oklch(71.1% 0.117 237.6) |
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 #51ACE2 | 2.51:1 | Fails | Lc -54.2 | Large or bold text, headings |
| Black text on #51ACE2 | 8.34:1 | AAA | Lc 54.9 | Large or bold text, headings |
| #51ACE2 text on white | 2.51:1 | Fails | Lc 49.1 | Large or bold text, headings |
| #51ACE2 text on black | 8.34:1 | AAA | Lc -52.9 | 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
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DDECF7
oklch(93.5% 0.022 239.4)
-
Step 200
200
#C1DEF1
oklch(88.5% 0.04 236.7)
-
Step 300
300
#94C8EB
oklch(80.9% 0.074 238.3)
-
Step 400
400 (this color)
#51ACE2
oklch(71.1% 0.117 237.6)
-
Step 500
500
#0094D3
oklch(63.2% 0.139 237.5)
-
Step 600
600
#007CB2
oklch(55.6% 0.123 237.7)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#004768
oklch(37.7% 0.083 237.5)
-
Step 950
950
#002A40
oklch(27% 0.06 237.8)
#51ACE2 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) | #93ABE5 | 0.068 |
| Deuteranopia (no green cones) | #7F9DE1 | 0.056 |
| Tritanopia (no blue cones) | #00BABE | 0.082 |
| Achromatopsia (no color) | #A3A3A3 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51ACE2
#51ACE2
oklch(71.1% 0.117 237.6)
- #D88E54
#D88E54
oklch(71% 0.117 57.5)
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 #51ACE2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.059
- Turquoise Blue #06B1C4 ΔE 0.062
- Cornflower Blue #6495ED ΔE 0.069
- Greyblue #77A1B5 ΔE 0.069
- Chefchaouen Blue #4895EF ΔE 0.072
- Vivid Sky Blue #4CC9F0 ΔE 0.078
- Carolina Blue #8AB8FE ΔE 0.078
- Bluegrey #85A3B2 ΔE 0.079
Use #51ACE2 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.