#51A1CA
Closest named color: Greyblue (#77A1B5). oklch(67.5% 0.099 233.2), rgb(81, 161, 202).
Aa
Black text reads best on this color (7.30:1).
About this color
#51A1CA is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.099 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.046 away. Black text reads best on it, at 7.30:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.30:1 |
| White text | 2.87:1 |
Values
| HEX | #51A1CA |
| RGB | rgb(81, 161, 202) |
| HSL | hsl(200, 53%, 55%) |
| OKLCH | oklch(67.5% 0.099 233.2) |
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 #51A1CA | 2.87:1 | Fails | Lc -60.1 | Content text, not long reading |
| Black text on #51A1CA | 7.30:1 | AAA | Lc 49.3 | Large or bold text, headings |
| #51A1CA text on white | 2.87:1 | Fails | Lc 54.8 | Large or bold text, headings |
| #51A1CA text on black | 7.30:1 | AAA | Lc -47.0 | 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
#F0F6FA
oklch(97% 0.008 236.6)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C4DEED
oklch(88.6% 0.035 233.1)
-
Step 300
300
#99C8E3
oklch(80.9% 0.062 233.7)
-
Step 400
400 (this color)
#51A1CA
oklch(67.5% 0.099 233.2)
-
Step 500
500
#1495C9
oklch(63.1% 0.126 233.1)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#042A3C
oklch(26.9% 0.053 234.4)
#51A1CA 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) | #8D9FCC | 0.065 |
| Deuteranopia (no green cones) | #7C93C9 | 0.055 |
| Tritanopia (no blue cones) | #00ACAF | 0.068 |
| Achromatopsia (no color) | #989898 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A1CA
#51A1CA
oklch(67.5% 0.099 233.2)
- #C7855B
#C7855B
oklch(67.5% 0.099 52.8)
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 #51A1CA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.046
- Turquoise Blue #06B1C4 ΔE 0.055
- Faded Blue #658CBB ΔE 0.057
- Cadet Blue #5F9EA0 ΔE 0.061
- Bluegrey #85A3B2 ΔE 0.064
- Bluey Grey #89A0B0 ΔE 0.067
- Silver Lake Blue #778DA9 ΔE 0.068
- Cool Gray #8D99AE ΔE 0.071
Use #51A1CA 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.