#0591C6
Closest named color: Water Blue (#0E87CC). oklch(61.8% 0.128 233.6), rgb(5, 145, 198).
Aa
Black text reads best on this color (5.87:1).
About this color
#0591C6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.128 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.032 away. Black text reads best on it, at 5.87:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.87:1 |
| White text | 3.57:1 |
Values
| HEX | #0591C6 |
| RGB | rgb(5, 145, 198) |
| HSL | hsl(196, 95%, 40%) |
| OKLCH | oklch(61.8% 0.128 233.6) |
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 #0591C6 | 3.57:1 | AA large text | Lc -68.2 | Content text, not long reading |
| Black text on #0591C6 | 5.87:1 | AA | Lc 41.3 | Non-text elements, placeholder text |
| #0591C6 text on white | 3.57:1 | AA large text | Lc 62.7 | Content text, not long reading |
| #0591C6 text on black | 5.87:1 | AA | Lc -39.0 | Non-text elements, placeholder text |
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 500.
-
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
#5BABD5
oklch(70.7% 0.1 233.5)
-
Step 500
500 (this color)
#0591C6
oklch(61.8% 0.128 233.6)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#032A3C
oklch(26.9% 0.053 233.9)
#0591C6 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) | #7690C8 | 0.079 |
| Deuteranopia (no green cones) | #5F80C5 | 0.066 |
| Tritanopia (no blue cones) | #009FA3 | 0.077 |
| Achromatopsia (no color) | #878787 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0591C6
#0591C6
oklch(61.8% 0.128 233.6)
- #C06E32
#C06E32
oklch(61.9% 0.127 53.8)
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 #0591C6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.032
- Blue NCS #118AB2 ΔE 0.033
- Cool Blue #4984B8 ΔE 0.044
- Steel Blue #4682B4 ΔE 0.048
- Off Blue #5684AE ΔE 0.056
- Dusty Blue #5A86AD ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.058
- Faded Blue #658CBB ΔE 0.058
Use #0591C6 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.