#51A2DF
Closest named color: Cornflower Blue (#6495ED). oklch(68.7% 0.12 243.6), rgb(81, 162, 223).
Aa
Black text reads best on this color (7.58:1).
About this color
#51A2DF is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.120 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.047 away. Black text reads best on it, at 7.58:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.58:1 |
| White text | 2.76:1 |
Values
| HEX | #51A2DF |
| RGB | rgb(81, 162, 223) |
| HSL | hsl(206, 69%, 60%) |
| OKLCH | oklch(68.7% 0.12 243.6) |
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 #51A2DF | 2.76:1 | Fails | Lc -58.4 | Large or bold text, headings |
| Black text on #51A2DF | 7.58:1 | AAA | Lc 50.8 | Large or bold text, headings |
| #51A2DF text on white | 2.76:1 | Fails | Lc 53.2 | Large or bold text, headings |
| #51A2DF text on black | 7.58:1 | AAA | Lc -48.7 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C3DDF3
oklch(88.5% 0.041 243.7)
-
Step 300
300
#97C7EE
oklch(81% 0.075 243.4)
-
Step 400
400 (this color)
#51A2DF
oklch(68.7% 0.12 243.6)
-
Step 500
500
#0491DE
oklch(63.2% 0.153 243.4)
-
Step 600
600
#0079BC
oklch(55.5% 0.136 243.9)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#022943
oklch(27% 0.064 243.6)
#51A2DF 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) | #87A3E2 | 0.057 |
| Deuteranopia (no green cones) | #7395DE | 0.045 |
| Tritanopia (no blue cones) | #00B1B7 | 0.090 |
| Achromatopsia (no color) | #9B9B9B | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A2DF
#51A2DF
oklch(68.7% 0.12 243.6)
- #CE8943
#CE8943
oklch(68.7% 0.12 63.7)
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 #51A2DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.047
- Chefchaouen Blue #4895EF ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.060
- Greyblue #77A1B5 ΔE 0.069
- Faded Blue #658CBB ΔE 0.070
- Turquoise Blue #06B1C4 ΔE 0.073
- Soft Blue #6488EA ΔE 0.076
- Deep Sky Blue #00BFFF ΔE 0.081
Use #51A2DF 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.