#51A8CA
Closest named color: Turquoise Blue (#06B1C4). oklch(69.1% 0.097 226.4), rgb(81, 168, 202).
Aa
Black text reads best on this color (7.80:1).
About this color
#51A8CA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 69%, its chroma 0.097 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.041 away. Black text reads best on it, at 7.80:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.80:1 |
| White text | 2.69:1 |
Values
| HEX | #51A8CA |
| RGB | rgb(81, 168, 202) |
| HSL | hsl(197, 53%, 55%) |
| OKLCH | oklch(69.1% 0.097 226.4) |
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 #51A8CA | 2.69:1 | Fails | Lc -57.2 | Large or bold text, headings |
| Black text on #51A8CA | 7.80:1 | AAA | Lc 52.0 | Large or bold text, headings |
| #51A8CA text on white | 2.69:1 | Fails | Lc 52.0 | Large or bold text, headings |
| #51A8CA text on black | 7.80:1 | AAA | Lc -49.9 | 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
#DEEDF3
oklch(93.7% 0.018 223.6)
-
Step 200
200
#C3DEEA
oklch(88.4% 0.033 226.4)
-
Step 300
300
#97C9DF
oklch(80.8% 0.061 226.8)
-
Step 400
400 (this color)
#51A8CA
oklch(69.1% 0.097 226.4)
-
Step 500
500
#0097C1
oklch(63% 0.121 226.4)
-
Step 600
600
#007FA3
oklch(55.6% 0.107 226.4)
-
Step 700
700
#006B8A
oklch(49.2% 0.095 226.5)
-
Step 800
800
#005771
oklch(42.6% 0.082 226.6)
-
Step 900
900
#00495F
oklch(37.8% 0.072 226.2)
-
Step 950
950
#012B3A
oklch(27% 0.052 227.6)
#51A8CA 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) | #96A5CC | 0.074 |
| Deuteranopia (no green cones) | #8498CA | 0.064 |
| Tritanopia (no blue cones) | #00B2B3 | 0.061 |
| Achromatopsia (no color) | #9E9E9E | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A8CA
#51A8CA
oklch(69.1% 0.097 226.4)
- #CE8967
#CE8967
oklch(69.2% 0.097 46.9)
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 #51A8CA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.041
- Greyblue #77A1B5 ΔE 0.043
- Bluegrey #85A3B2 ΔE 0.058
- Cadet Blue #5F9EA0 ΔE 0.060
- Bluey Grey #89A0B0 ΔE 0.063
- Light Sea Green #20B2AA ΔE 0.070
- Cool Gray #8D99AE ΔE 0.073
- Faded Blue #658CBB ΔE 0.076
Use #51A8CA 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.