#51A3CF
Closest named color: Greyblue (#77A1B5). oklch(68.2% 0.103 234.5), rgb(81, 163, 207).
Aa
Black text reads best on this color (7.48:1).
About this color
#51A3CF is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.103 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.049 away. Black text reads best on it, at 7.48:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.48:1 |
| White text | 2.80:1 |
Values
| HEX | #51A3CF |
| RGB | rgb(81, 163, 207) |
| HSL | hsl(201, 57%, 56%) |
| OKLCH | oklch(68.2% 0.103 234.5) |
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 #51A3CF | 2.80:1 | Fails | Lc -59.0 | Large or bold text, headings |
| Black text on #51A3CF | 7.48:1 | AAA | Lc 50.3 | Large or bold text, headings |
| #51A3CF text on white | 2.80:1 | Fails | Lc 53.7 | Large or bold text, headings |
| #51A3CF text on black | 7.48:1 | AAA | Lc -48.1 | 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
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C3DEEE
oklch(88.6% 0.036 233.8)
-
Step 300
300
#98C8E4
oklch(80.9% 0.064 234.2)
-
Step 400
400 (this color)
#51A3CF
oklch(68.2% 0.103 234.5)
-
Step 500
500
#0895CD
oklch(63.2% 0.132 234.5)
-
Step 600
600
#007DAD
oklch(55.6% 0.117 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
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
#032A3D
oklch(27% 0.054 235.3)
#51A3CF 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) | #8EA2D1 | 0.065 |
| Deuteranopia (no green cones) | #7C95CE | 0.054 |
| Tritanopia (no blue cones) | #00AFB2 | 0.072 |
| Achromatopsia (no color) | #9A9A9A | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A3CF
#51A3CF
oklch(68.2% 0.103 234.5)
- #CA8759
#CA8759
oklch(68.2% 0.103 54.6)
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 #51A3CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.049
- Turquoise Blue #06B1C4 ΔE 0.054
- Faded Blue #658CBB ΔE 0.063
- Bluegrey #85A3B2 ΔE 0.065
- Cadet Blue #5F9EA0 ΔE 0.068
- Cornflower Blue #6495ED ΔE 0.068
- Bluey Grey #89A0B0 ΔE 0.069
- Chefchaouen Blue #4895EF ΔE 0.069
Use #51A3CF 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.