#0591C4
Closest named color: Blue NCS (#118AB2). oklch(61.7% 0.126 232.6), rgb(5, 145, 196).
Aa
Black text reads best on this color (5.85:1).
About this color
#0591C4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.126 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.030 away. Black text reads best on it, at 5.85:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.85:1 |
| White text | 3.58:1 |
Values
| HEX | #0591C4 |
| RGB | rgb(5, 145, 196) |
| HSL | hsl(196, 95%, 39%) |
| OKLCH | oklch(61.7% 0.126 232.6) |
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 #0591C4 | 3.58:1 | AA large text | Lc -68.3 | Content text, not long reading |
| Black text on #0591C4 | 5.85:1 | AA | Lc 41.2 | Non-text elements, placeholder text |
| #0591C4 text on white | 3.58:1 | AA large text | Lc 62.8 | Content text, not long reading |
| #0591C4 text on black | 5.85:1 | AA | Lc -38.8 | 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
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C4DEEC
oklch(88.6% 0.034 231.2)
-
Step 300
300
#99C8E2
oklch(80.8% 0.062 232.7)
-
Step 400
400
#5BABD4
oklch(70.7% 0.099 232.9)
-
Step 500
500 (this color)
#0591C4
oklch(61.7% 0.126 232.6)
-
Step 600
600
#007EAB
oklch(55.7% 0.114 232.4)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
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
#042A3B
oklch(26.9% 0.052 232.8)
#0591C4 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) | #7790C6 | 0.080 |
| Deuteranopia (no green cones) | #6180C3 | 0.068 |
| Tritanopia (no blue cones) | #009FA2 | 0.076 |
| Achromatopsia (no color) | #878787 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0591C4
#0591C4
oklch(61.7% 0.126 232.6)
- #BF6D35
#BF6D35
oklch(61.7% 0.126 52.4)
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 #0591C4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.030
- Water Blue #0E87CC ΔE 0.034
- Cool Blue #4984B8 ΔE 0.043
- Steel Blue #4682B4 ΔE 0.047
- Off Blue #5684AE ΔE 0.055
- Dusty Blue #5A86AD ΔE 0.056
- Faded Blue #658CBB ΔE 0.058
- Teal Blue #01889F ΔE 0.058
Use #0591C4 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.