#51AAEB
Closest named color: Cornflower Blue (#6495ED). oklch(71.1% 0.128 243.1), rgb(81, 170, 235).
Aa
Black text reads best on this color (8.29:1).
About this color
#51AAEB is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.128 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.058 away. Black text reads best on it, at 8.29:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.29:1 |
| White text | 2.53:1 |
Values
| HEX | #51AAEB |
| RGB | rgb(81, 170, 235) |
| HSL | hsl(205, 79%, 62%) |
| OKLCH | oklch(71.1% 0.128 243.1) |
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 #51AAEB | 2.53:1 | Fails | Lc -54.4 | Large or bold text, headings |
| Black text on #51AAEB | 8.29:1 | AAA | Lc 54.7 | Large or bold text, headings |
| #51AAEB text on white | 2.53:1 | Fails | Lc 49.3 | Large or bold text, headings |
| #51AAEB text on black | 8.29:1 | AAA | Lc -52.6 | 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
#DDECF8
oklch(93.5% 0.023 241.9)
-
Step 200
200
#C1DDF5
oklch(88.5% 0.045 244.2)
-
Step 300
300
#94C7F1
oklch(80.9% 0.08 243.8)
-
Step 400
400 (this color)
#51AAEB
oklch(71.1% 0.128 243.1)
-
Step 500
500
#0091DE
oklch(63.1% 0.153 243.2)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900
#00466E
oklch(37.8% 0.091 242.8)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#51AAEB 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) | #8DABEE | 0.061 |
| Deuteranopia (no green cones) | #789CEA | 0.048 |
| Tritanopia (no blue cones) | #00BAC1 | 0.093 |
| Achromatopsia (no color) | #A3A3A3 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AAEB
#51AAEB
oklch(71.1% 0.128 243.1)
- #D98F44
#D98F44
oklch(71.1% 0.127 63.4)
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 #51AAEB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.058
- Deep Sky Blue #00BFFF ΔE 0.058
- Chefchaouen Blue #4895EF ΔE 0.061
- Carolina Blue #8AB8FE ΔE 0.075
- Turquoise Blue #06B1C4 ΔE 0.076
- Dark Sky Blue #448EE4 ΔE 0.078
- Greyblue #77A1B5 ΔE 0.081
- Periwinkle Blue #8F99FB ΔE 0.082
Use #51AAEB 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.