#3789BC
Closest named color: Cool Blue (#4984B8). oklch(60.3% 0.11 239.7), rgb(55, 137, 188).
Aa
Black text reads best on this color (5.46:1).
About this color
#3789BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.110 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.018 away. Black text reads best on it, at 5.46:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.46:1 |
| White text | 3.84:1 |
Values
| HEX | #3789BC |
| RGB | rgb(55, 137, 188) |
| HSL | hsl(203, 55%, 48%) |
| OKLCH | oklch(60.3% 0.11 239.7) |
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 #3789BC | 3.84:1 | AA large text | Lc -71.1 | Content text, not long reading |
| Black text on #3789BC | 5.46:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #3789BC text on white | 3.84:1 | AA large text | Lc 65.6 | Content text, not long reading |
| #3789BC text on black | 5.46:1 | AA | Lc -36.1 | 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
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DCEB
oklch(88.4% 0.03 240.2)
-
Step 300
300
#A2C6E0
oklch(80.9% 0.053 239.7)
-
Step 400
400
#6DA8D1
oklch(70.7% 0.086 239.9)
-
Step 500
500 (this color)
#3789BC
oklch(60.3% 0.11 239.7)
-
Step 600
600
#167BB2
oklch(55.6% 0.12 239.9)
-
Step 700
700
#016799
oklch(49% 0.112 240.1)
-
Step 800
800
#0B557C
oklch(42.8% 0.092 239.2)
-
Step 900
900
#154664
oklch(37.7% 0.073 240)
-
Step 950
950
#0E293A
oklch(26.9% 0.046 239.3)
#3789BC 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) | #7189BE | 0.058 |
| Deuteranopia (no green cones) | #5F7CBB | 0.048 |
| Tritanopia (no blue cones) | #00969B | 0.075 |
| Achromatopsia (no color) | #828282 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3789BC
#3789BC
oklch(60.3% 0.11 239.7)
- #B17036
#B17036
oklch(60.4% 0.11 59.9)
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 #3789BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.018
- Steel Blue #4682B4 ΔE 0.022
- Blue NCS #118AB2 ΔE 0.025
- Water Blue #0E87CC ΔE 0.031
- Off Blue #5684AE ΔE 0.032
- Dusty Blue #5A86AD ΔE 0.035
- Faded Blue #658CBB ΔE 0.045
- Windows Blue #3778BF ΔE 0.050
Use #3789BC 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.