#377EE4
Closest named color: Clear Blue (#247AFD). oklch(60.1% 0.17 258), rgb(55, 126, 228).
Aa
Black text reads best on this color (5.26:1).
About this color
#377EE4 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.170 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.041 away. Black text reads best on it, at 5.26:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.26:1 |
| White text | 3.98:1 |
Values
| HEX | #377EE4 |
| RGB | rgb(55, 126, 228) |
| HSL | hsl(215, 76%, 55%) |
| OKLCH | oklch(60.1% 0.17 258) |
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 #377EE4 | 3.98:1 | AA large text | Lc -72.3 | Content text, not long reading |
| Black text on #377EE4 | 5.26:1 | AA | Lc 37.3 | Non-text elements, placeholder text |
| #377EE4 text on white | 3.98:1 | AA large text | Lc 66.8 | Content text, not long reading |
| #377EE4 text on black | 5.26:1 | AA | Lc -34.9 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF8
oklch(88.6% 0.046 257.6)
-
Step 300
300
#9FC3F7
oklch(81% 0.084 257.5)
-
Step 400
400
#6AA1F3
oklch(70.6% 0.134 258.2)
-
Step 500
500 (this color)
#377EE4
oklch(60.1% 0.17 258)
-
Step 600
600
#1D6EDD
oklch(55.6% 0.186 258.1)
-
Step 700
700
#0D5BC0
oklch(49% 0.173 258.1)
-
Step 800
800
#104B9B
oklch(42.6% 0.143 258.1)
-
Step 900
900
#16407B
oklch(37.7% 0.111 257.8)
-
Step 950
950
#0E2648
oklch(27% 0.07 257.6)
#377EE4 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) | #4988E8 | 0.033 |
| Deuteranopia (no green cones) | #2378E2 | 0.022 |
| Tritanopia (no blue cones) | #0096A6 | 0.131 |
| Achromatopsia (no color) | #7F7F7F | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #377EE4
#377EE4
oklch(60.1% 0.17 258)
- #A97500
#A97500
oklch(60% 0.125 77.7)
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 #377EE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.046
- Water Blue #0E87CC ΔE 0.051
- Royal Blue #4169E1 ΔE 0.052
- Cerulean Blue #056EEE ΔE 0.054
- Soft Blue #6488EA ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.056
- Windows Blue #3778BF ΔE 0.057
Use #377EE4 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.