#277BE9
Closest named color: Clear Blue (#247AFD). oklch(59.4% 0.184 257.2), rgb(39, 123, 233).
Aa
Black text reads best on this color (5.09:1).
About this color
#277BE9 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.184 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.030 away. Black text reads best on it, at 5.09:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.184) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.09:1 |
| White text | 4.12:1 |
Values
| HEX | #277BE9 |
| RGB | rgb(39, 123, 233) |
| HSL | hsl(214, 82%, 53%) |
| OKLCH | oklch(59.4% 0.184 257.2) |
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 #277BE9 | 4.12:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #277BE9 | 5.09:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #277BE9 text on white | 4.12:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #277BE9 text on black | 5.09:1 | AA | Lc -33.9 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFB
oklch(88.5% 0.05 257.7)
-
Step 300
300
#9CC3FB
oklch(80.9% 0.09 257.4)
-
Step 400
400
#63A1F9
oklch(70.6% 0.145 257.3)
-
Step 500
500 (this color)
#277BE9
oklch(59.4% 0.184 257.2)
-
Step 600
600
#006DE4
oklch(55.5% 0.199 257.3)
-
Step 700
700
#005CC1
oklch(49.2% 0.175 257.1)
-
Step 800
800
#004BA0
oklch(42.8% 0.152 257.1)
-
Step 900
900
#0E3F80
oklch(37.7% 0.121 257.5)
-
Step 950
950
#0A264B
oklch(27.1% 0.076 256.8)
#277BE9 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) | #3C86ED | 0.034 |
| Deuteranopia (no green cones) | #0075E7 | 0.022 |
| Tritanopia (no blue cones) | #0096A7 | 0.140 |
| Achromatopsia (no color) | #7D7D7D | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #277BE9
#277BE9
oklch(59.4% 0.184 257.2)
- #A77300
#A77300
oklch(59.4% 0.124 77.3)
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 #277BE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.030
- Cerulean Blue #056EEE ΔE 0.039
- Royal Blue #4169E1 ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.059
- Water Blue #0E87CC ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.060
- Neon Blue #4361EE ΔE 0.063
- Windows Blue #3778BF ΔE 0.064
Use #277BE9 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.