#378ABA
Closest named color: Cool Blue (#4984B8). oklch(60.4% 0.108 237.8), rgb(55, 138, 186).
Aa
Black text reads best on this color (5.50:1).
About this color
#378ABA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.108 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.020 away. Black text reads best on it, at 5.50:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.50:1 |
| White text | 3.81:1 |
Values
| HEX | #378ABA |
| RGB | rgb(55, 138, 186) |
| HSL | hsl(202, 54%, 47%) |
| OKLCH | oklch(60.4% 0.108 237.8) |
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 #378ABA | 3.81:1 | AA large text | Lc -70.9 | Content text, not long reading |
| Black text on #378ABA | 5.50:1 | AA | Lc 38.7 | Non-text elements, placeholder text |
| #378ABA text on white | 3.81:1 | AA large text | Lc 65.4 | Content text, not long reading |
| #378ABA text on black | 5.50:1 | AA | Lc -36.3 | 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
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DCEB
oklch(88.4% 0.03 240.2)
-
Step 300
300
#A2C6DF
oklch(80.9% 0.052 238.6)
-
Step 400
400
#6CA9CF
oklch(70.8% 0.084 237)
-
Step 500
500 (this color)
#378ABA
oklch(60.4% 0.108 237.8)
-
Step 600
600
#147CAF
oklch(55.7% 0.117 237.5)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#0A557A
oklch(42.7% 0.09 237.7)
-
Step 900
900
#154662
oklch(37.6% 0.07 238.1)
-
Step 950
950
#0E293A
oklch(26.9% 0.046 239.3)
#378ABA 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) | #738ABC | 0.060 |
| Deuteranopia (no green cones) | #617DB9 | 0.050 |
| Tritanopia (no blue cones) | #00969A | 0.072 |
| Achromatopsia (no color) | #838383 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378ABA
#378ABA
oklch(60.4% 0.108 237.8)
- #B1703B
#B1703B
oklch(60.4% 0.107 57.9)
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 #378ABA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.020
- Blue NCS #118AB2 ΔE 0.023
- Steel Blue #4682B4 ΔE 0.023
- Off Blue #5684AE ΔE 0.031
- Dusty Blue #5A86AD ΔE 0.034
- Water Blue #0E87CC ΔE 0.035
- Faded Blue #658CBB ΔE 0.044
- Teal Blue #01889F ΔE 0.050
Use #378ABA 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.