#51AEDD
Closest named color: Turquoise Blue (#06B1C4). oklch(71.4% 0.111 233.4), rgb(81, 174, 221).
Aa
Black text reads best on this color (8.44:1).
About this color
#51AEDD is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.111 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.053 away. Black text reads best on it, at 8.44:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.44:1 |
| White text | 2.48:1 |
Values
| HEX | #51AEDD |
| RGB | rgb(81, 174, 221) |
| HSL | hsl(200, 67%, 59%) |
| OKLCH | oklch(71.4% 0.111 233.4) |
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 #51AEDD | 2.48:1 | Fails | Lc -53.6 | Large or bold text, headings |
| Black text on #51AEDD | 8.44:1 | AAA | Lc 55.4 | Large or bold text, headings |
| #51AEDD text on white | 2.48:1 | Fails | Lc 48.6 | Large or bold text, headings |
| #51AEDD text on black | 8.44:1 | AAA | Lc -53.4 | 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
#DDEDF5
oklch(93.7% 0.02 229)
-
Step 200
200
#C1DEEF
oklch(88.5% 0.039 233.6)
-
Step 300
300
#94C9E7
oklch(80.9% 0.07 233.6)
-
Step 400
400 (this color)
#51AEDD
oklch(71.4% 0.111 233.4)
-
Step 500
500
#0095CB
oklch(63% 0.131 233.2)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
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
#002A3D
oklch(26.9% 0.056 233.8)
#51AEDD 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) | #97ACDF | 0.072 |
| Deuteranopia (no green cones) | #849EDC | 0.062 |
| Tritanopia (no blue cones) | #00BBBE | 0.074 |
| Achromatopsia (no color) | #A4A4A4 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AEDD
#51AEDD
oklch(71.4% 0.111 233.4)
- #D98F5E
#D98F5E
oklch(71.5% 0.111 53.5)
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 #51AEDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.053
- Deep Sky Blue #00BFFF ΔE 0.059
- Greyblue #77A1B5 ΔE 0.064
- Vivid Sky Blue #4CC9F0 ΔE 0.073
- Bluegrey #85A3B2 ΔE 0.073
- Cornflower Blue #6495ED ΔE 0.078
- Bluey Grey #89A0B0 ΔE 0.079
- Carolina Blue #8AB8FE ΔE 0.080
Use #51AEDD 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.