#1289BB
Closest named color: Blue NCS (#118AB2). oklch(59.4% 0.121 234.1), rgb(18, 137, 187).
Aa
Black text reads best on this color (5.32:1).
About this color
#1289BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.121 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.015 away. Black text reads best on it, at 5.32:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.32:1 |
| White text | 3.94:1 |
Values
| HEX | #1289BB |
| RGB | rgb(18, 137, 187) |
| HSL | hsl(198, 82%, 40%) |
| OKLCH | oklch(59.4% 0.121 234.1) |
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 #1289BB | 3.94:1 | AA large text | Lc -71.8 | Content text, not long reading |
| Black text on #1289BB | 5.32:1 | AA | Lc 37.8 | Non-text elements, placeholder text |
| #1289BB text on white | 3.94:1 | AA large text | Lc 66.3 | Content text, not long reading |
| #1289BB text on black | 5.32:1 | AA | Lc -35.3 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C5DDEC
oklch(88.4% 0.033 235.2)
-
Step 300
300
#9CC8E1
oklch(81% 0.058 233.3)
-
Step 400
400
#61AAD3
oklch(70.7% 0.095 234.9)
-
Step 500
500 (this color)
#1289BB
oklch(59.4% 0.121 234.1)
-
Step 600
600
#007DAD
oklch(55.6% 0.117 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#014865
oklch(37.8% 0.079 233.9)
-
Step 950
950
#072A3B
oklch(27% 0.05 234.4)
#1289BB 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) | #7088BD | 0.074 |
| Deuteranopia (no green cones) | #5B7ABA | 0.061 |
| Tritanopia (no blue cones) | #00969A | 0.073 |
| Achromatopsia (no color) | #808080 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1289BB
#1289BB
oklch(59.4% 0.121 234.1)
- #B56830
#B56830
oklch(59.4% 0.121 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 #1289BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.015
- Water Blue #0E87CC ΔE 0.028
- Steel Blue #4682B4 ΔE 0.031
- Cool Blue #4984B8 ΔE 0.032
- Nice Blue #107AB0 ΔE 0.044
- Teal Blue #01889F ΔE 0.045
- Off Blue #5684AE ΔE 0.045
- Dusty Blue #5A86AD ΔE 0.049
Use #1289BB 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.