#377DE0
Closest named color: Clear Blue (#247AFD). oklch(59.7% 0.166 257.7), rgb(55, 125, 224).
Aa
Black text reads best on this color (5.17:1).
About this color
#377DE0 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.166 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.046 away. Black text reads best on it, at 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.17:1 |
| White text | 4.06:1 |
Values
| HEX | #377DE0 |
| RGB | rgb(55, 125, 224) |
| HSL | hsl(215, 73%, 55%) |
| OKLCH | oklch(59.7% 0.166 257.7) |
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 #377DE0 | 4.06:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #377DE0 | 5.17:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #377DE0 text on white | 4.06:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #377DE0 text on black | 5.17:1 | AA | Lc -34.3 | 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
#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
#A0C3F5
oklch(80.9% 0.081 257.3)
-
Step 400
400
#6BA2F1
oklch(70.8% 0.13 257.5)
-
Step 500
500 (this color)
#377DE0
oklch(59.7% 0.166 257.7)
-
Step 600
600
#1F6FDA
oklch(55.6% 0.181 257.7)
-
Step 700
700
#105CBD
oklch(49.1% 0.168 257.7)
-
Step 800
800
#124C99
oklch(42.7% 0.139 257.6)
-
Step 900
900
#17407A
oklch(37.7% 0.109 257.8)
-
Step 950
950
#0F2647
oklch(27% 0.068 257.7)
#377DE0 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) | #4A86E4 | 0.031 |
| Deuteranopia (no green cones) | #2777DE | 0.021 |
| Tritanopia (no blue cones) | #0094A3 | 0.129 |
| Achromatopsia (no color) | #7E7E7E | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #377DE0
#377DE0
oklch(59.7% 0.166 257.7)
- #A87400
#A87400
oklch(59.7% 0.125 77.5)
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 #377DE0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.046
- Water Blue #0E87CC ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.048
- Royal Blue #4169E1 ΔE 0.050
- Windows Blue #3778BF ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.054
- Soft Blue #6488EA ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.062
Use #377DE0 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.