#51ADDE
Closest named color: Turquoise Blue (#06B1C4). oklch(71.2% 0.113 234.7), rgb(81, 173, 222).
Aa
Black text reads best on this color (8.38:1).
About this color
#51ADDE is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.113 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.055 away. Black text reads best on it, at 8.38:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.38:1 |
| White text | 2.50:1 |
Values
| HEX | #51ADDE |
| RGB | rgb(81, 173, 222) |
| HSL | hsl(201, 68%, 59%) |
| OKLCH | oklch(71.2% 0.113 234.7) |
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 #51ADDE | 2.50:1 | Fails | Lc -54.0 | Large or bold text, headings |
| Black text on #51ADDE | 8.38:1 | AAA | Lc 55.1 | Large or bold text, headings |
| #51ADDE text on white | 2.50:1 | Fails | Lc 48.9 | Large or bold text, headings |
| #51ADDE text on black | 8.38:1 | AAA | Lc -53.0 | 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
#94C9E8
oklch(81% 0.07 234.5)
-
Step 400
400 (this color)
#51ADDE
oklch(71.2% 0.113 234.7)
-
Step 500
500
#0095CE
oklch(63.2% 0.133 234.7)
-
Step 600
600
#007DAE
oklch(55.7% 0.118 234.9)
-
Step 700
700
#006993
oklch(49.2% 0.104 234.9)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004765
oklch(37.6% 0.08 234.9)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#51ADDE 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) | #95ACE0 | 0.070 |
| Deuteranopia (no green cones) | #829DDD | 0.060 |
| Tritanopia (no blue cones) | #00BABD | 0.077 |
| Achromatopsia (no color) | #A4A4A4 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51ADDE
#51ADDE
oklch(71.2% 0.113 234.7)
- #D88E5B
#D88E5B
oklch(71.1% 0.112 54.5)
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 #51ADDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.055
- Deep Sky Blue #00BFFF ΔE 0.060
- Greyblue #77A1B5 ΔE 0.065
- Bluegrey #85A3B2 ΔE 0.074
- Cornflower Blue #6495ED ΔE 0.075
- Vivid Sky Blue #4CC9F0 ΔE 0.075
- Chefchaouen Blue #4895EF ΔE 0.078
- Bluey Grey #89A0B0 ΔE 0.080
Use #51ADDE 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.