#377FEC
Closest named color: Clear Blue (#247AFD). oklch(60.9% 0.18 258.8), rgb(55, 127, 236).
Aa
Black text reads best on this color (5.40:1).
About this color
#377FEC is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.180 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.032 away. Black text reads best on it, at 5.40:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.40:1 |
| White text | 3.88:1 |
Values
| HEX | #377FEC |
| RGB | rgb(55, 127, 236) |
| HSL | hsl(216, 83%, 57%) |
| OKLCH | oklch(60.9% 0.18 258.8) |
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 #377FEC | 3.88:1 | AA large text | Lc -71.3 | Content text, not long reading |
| Black text on #377FEC | 5.40:1 | AA | Lc 38.3 | Non-text elements, placeholder text |
| #377FEC text on white | 3.88:1 | AA large text | Lc 65.8 | Content text, not long reading |
| #377FEC text on black | 5.40:1 | AA | Lc -35.9 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9EC2FA
oklch(80.8% 0.089 259.1)
-
Step 400
400
#69A1F7
oklch(70.8% 0.14 258.7)
-
Step 500
500 (this color)
#377FEC
oklch(60.9% 0.18 258.8)
-
Step 600
600
#196DE2
oklch(55.6% 0.194 258.6)
-
Step 700
700
#095AC5
oklch(49.2% 0.182 258.7)
-
Step 800
800
#0E4A9F
oklch(42.7% 0.15 258.8)
-
Step 900
900
#153F7E
oklch(37.7% 0.117 258.8)
-
Step 950
950
#0D254A
oklch(26.9% 0.075 258.9)
#377FEC 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) | #448AF0 | 0.032 |
| Deuteranopia (no green cones) | #117AEA | 0.025 |
| Tritanopia (no blue cones) | #0099AA | 0.139 |
| Achromatopsia (no color) | #818181 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #377FEC
#377FEC
oklch(60.9% 0.18 258.8)
- #AB7800
#AB7800
oklch(60.9% 0.127 78.9)
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 #377FEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.032
- Dark Sky Blue #448EE4 ΔE 0.046
- Dodger Blue #1E90FF ΔE 0.048
- Soft Blue #6488EA ΔE 0.052
- Cerulean Blue #056EEE ΔE 0.053
- Cornflower #6A79F7 ΔE 0.055
- Royal Blue #4169E1 ΔE 0.055
- Water Blue #0E87CC ΔE 0.060
Use #377FEC 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.