#277DE9
Closest named color: Clear Blue (#247AFD). oklch(59.8% 0.182 256.5), rgb(39, 125, 233).
Aa
Black text reads best on this color (5.19:1).
About this color
#277DE9 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.182 and its hue 257°. 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 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #277DE9 |
| RGB | rgb(39, 125, 233) |
| HSL | hsl(213, 82%, 53%) |
| OKLCH | oklch(59.8% 0.182 256.5) |
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 #277DE9 | 4.04:1 | AA large text | Lc -72.6 | Content text, not long reading |
| Black text on #277DE9 | 5.19:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #277DE9 text on white | 4.04:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #277DE9 text on black | 5.19:1 | AA | Lc -34.6 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9BC3FA
oklch(80.8% 0.089 256.5)
-
Step 400
400
#63A2F8
oklch(70.8% 0.143 256.6)
-
Step 500
500 (this color)
#277DE9
oklch(59.8% 0.182 256.5)
-
Step 600
600
#006EE1
oklch(55.5% 0.194 256.7)
-
Step 700
700
#005DBF
oklch(49.2% 0.171 256.5)
-
Step 800
800
#004B9E
oklch(42.6% 0.15 256.7)
-
Step 900
900
#0C407F
oklch(37.8% 0.119 256.4)
-
Step 950
950
#0A264A
oklch(27% 0.075 256.3)
#277DE9 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) | #4088ED | 0.036 |
| Deuteranopia (no green cones) | #0076E7 | 0.024 |
| Tritanopia (no blue cones) | #0097A8 | 0.137 |
| Achromatopsia (no color) | #7E7E7E | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #277DE9
#277DE9
oklch(59.8% 0.182 256.5)
- #A97400
#A97400
oklch(59.8% 0.125 77)
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 #277DE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.032
- Cerulean Blue #056EEE ΔE 0.044
- Royal Blue #4169E1 ΔE 0.050
- Dark Sky Blue #448EE4 ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.056
- Water Blue #0E87CC ΔE 0.056
- Windows Blue #3778BF ΔE 0.064
- Soft Blue #6488EA ΔE 0.064
Use #277DE9 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.