#1789B7
Closest named color: Blue NCS (#118AB2). oklch(59.3% 0.116 232.3), rgb(23, 137, 183).
Aa
Black text reads best on this color (5.29:1).
About this color
#1789B7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.116 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.009 away. Black text reads best on it, at 5.29:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.29:1 |
| White text | 3.96:1 |
Values
| HEX | #1789B7 |
| RGB | rgb(23, 137, 183) |
| HSL | hsl(197, 78%, 40%) |
| OKLCH | oklch(59.3% 0.116 232.3) |
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 #1789B7 | 3.96:1 | AA large text | Lc -72.0 | Content text, not long reading |
| Black text on #1789B7 | 5.29:1 | AA | Lc 37.6 | Non-text elements, placeholder text |
| #1789B7 text on white | 3.96:1 | AA large text | Lc 66.5 | Content text, not long reading |
| #1789B7 text on black | 5.29:1 | AA | Lc -35.2 | 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
#A0C7DD
oklch(80.9% 0.052 233)
-
Step 400
400
#69AACC
oklch(70.7% 0.083 232.5)
-
Step 500
500
#3894BF
oklch(63.1% 0.107 232.4)
-
Step 600
600 (this color)
#1789B7
oklch(59.3% 0.116 232.3)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#0F4760
oklch(37.6% 0.07 232.9)
-
Step 950
950
#0C2A38
oklch(27% 0.044 231.9)
#1789B7 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) | #7288B9 | 0.075 |
| Deuteranopia (no green cones) | #5D7AB6 | 0.062 |
| Tritanopia (no blue cones) | #009599 | 0.067 |
| Achromatopsia (no color) | #808080 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1789B7
#1789B7
oklch(59.3% 0.116 232.3)
- #B36836
#B36836
oklch(59.2% 0.116 52.2)
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 #1789B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.009
- Steel Blue #4682B4 ΔE 0.030
- Cool Blue #4984B8 ΔE 0.032
- Water Blue #0E87CC ΔE 0.035
- Teal Blue #01889F ΔE 0.039
- Off Blue #5684AE ΔE 0.042
- Nice Blue #107AB0 ΔE 0.044
- Dusty Blue #5A86AD ΔE 0.046
Use #1789B7 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.