#277BFF
Closest named color: Clear Blue (#247AFD). oklch(61% 0.212 259.7), rgb(39, 123, 255).
Aa
Black text reads best on this color (5.36:1).
About this color
#277BFF is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.212 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.004 away. Black text reads best on it, at 5.36:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.212) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.36:1 |
| White text | 3.91:1 |
Values
| HEX | #277BFF |
| RGB | rgb(39, 123, 255) |
| HSL | hsl(217, 100%, 58%) |
| OKLCH | oklch(61% 0.212 259.7) |
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 #277BFF | 3.91:1 | AA large text | Lc -71.4 | Content text, not long reading |
| Black text on #277BFF | 5.36:1 | AA | Lc 38.2 | Non-text elements, placeholder text |
| #277BFF text on white | 3.91:1 | AA large text | Lc 65.9 | Content text, not long reading |
| #277BFF text on black | 5.36:1 | AA | Lc -35.8 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C4DBFF
oklch(88.6% 0.056 259.3)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#659FFF
oklch(70.6% 0.154 260)
-
Step 500
500 (this color)
#277BFF
oklch(61% 0.212 259.7)
-
Step 600
600
#0068F2
oklch(55.6% 0.223 259.6)
-
Step 700
700
#0057CD
oklch(49.1% 0.196 259.6)
-
Step 800
800
#0047AA
oklch(42.8% 0.171 259.6)
-
Step 900
900
#0A3C89
oklch(37.6% 0.138 259.8)
-
Step 950
950
#092450
oklch(27% 0.087 259.9)
#277BFF 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) | #138BFF | 0.039 |
| Deuteranopia (no green cones) | #0078FC | 0.016 |
| Tritanopia (no blue cones) | #009CB1 | 0.163 |
| Achromatopsia (no color) | #818181 | 0.212 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #277BFF
#277BFF
oklch(61% 0.212 259.7)
- #AB7900
#AB7900
oklch(61.1% 0.127 79.7)
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 #277BFF, closest first.
No curated palette has a color within ΔE 0.04 of #277BFF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.004
- Cerulean Blue #056EEE ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.053
- Bright Blue #0165FC ΔE 0.057
- Royal Blue #4169E1 ΔE 0.060
- Cornflower #6A79F7 ΔE 0.061
- Neon Blue #4361EE ΔE 0.064
- Dark Sky Blue #448EE4 ΔE 0.072
Use #277BFF 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.