#1589B4
Closest named color: Blue NCS (#118AB2). oklch(59.1% 0.113 230.3), rgb(21, 137, 180).
Aa
Black text reads best on this color (5.26:1).
About this color
#1589B4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.113 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.005 away. Black text reads best on it, at 5.26:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.26:1 |
| White text | 3.98:1 |
Values
| HEX | #1589B4 |
| RGB | rgb(21, 137, 180) |
| HSL | hsl(196, 79%, 39%) |
| OKLCH | oklch(59.1% 0.113 230.3) |
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 #1589B4 | 3.98:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #1589B4 | 5.26:1 | AA | Lc 37.4 | Non-text elements, placeholder text |
| #1589B4 text on white | 3.98:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #1589B4 text on black | 5.26:1 | AA | Lc -35.0 | 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 600.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C7DDE9
oklch(88.5% 0.029 231.5)
-
Step 300
300
#A0C7DC
oklch(80.8% 0.051 231.7)
-
Step 400
400
#68AACA
oklch(70.6% 0.082 230.5)
-
Step 500
500
#3895BD
oklch(63.2% 0.105 230.3)
-
Step 600
600 (this color)
#1589B4
oklch(59.1% 0.113 230.3)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#0F485F
oklch(37.8% 0.068 230.3)
-
Step 950
950
#0C2A37
oklch(26.9% 0.043 229.9)
#1589B4 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) | #7387B6 | 0.077 |
| Deuteranopia (no green cones) | #5F79B3 | 0.066 |
| Tritanopia (no blue cones) | #009597 | 0.066 |
| Achromatopsia (no color) | #7F7F7F | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1589B4
#1589B4
oklch(59.1% 0.113 230.3)
- #B3683A
#B3683A
oklch(59.2% 0.114 50.5)
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 #1589B4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.005
- Steel Blue #4682B4 ΔE 0.032
- Teal Blue #01889F ΔE 0.034
- Cool Blue #4984B8 ΔE 0.034
- Water Blue #0E87CC ΔE 0.039
- Off Blue #5684AE ΔE 0.043
- Nice Blue #107AB0 ΔE 0.044
- Dusty Blue #5A86AD ΔE 0.047
Use #1589B4 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.