#277FFF
Closest named color: Clear Blue (#247AFD). oklch(61.8% 0.208 258.8), rgb(39, 127, 255).
Aa
Black text reads best on this color (5.56:1).
About this color
#277FFF is a medium-dark, vivid blue. In OKLCH its lightness is 62%, its chroma 0.208 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.013 away. Black text reads best on it, at 5.56:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | vivid (0.208) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.56:1 |
| White text | 3.77:1 |
Values
| HEX | #277FFF |
| RGB | rgb(39, 127, 255) |
| HSL | hsl(216, 100%, 58%) |
| OKLCH | oklch(61.8% 0.208 258.8) |
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 #277FFF | 3.77:1 | AA large text | Lc -70.1 | Content text, not long reading |
| Black text on #277FFF | 5.56:1 | AA | Lc 39.5 | Non-text elements, placeholder text |
| #277FFF text on white | 3.77:1 | AA large text | Lc 64.6 | Content text, not long reading |
| #277FFF text on black | 5.56:1 | AA | Lc -37.0 | 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
#DEEBFE
oklch(93.6% 0.029 257.8)
-
Step 200
200
#C3DBFF
oklch(88.5% 0.056 258.4)
-
Step 300
300
#9BC2FF
oklch(80.8% 0.097 259.2)
-
Step 400
400
#62A0FF
oklch(70.7% 0.154 258.7)
-
Step 500
500 (this color)
#277FFF
oklch(61.8% 0.208 258.8)
-
Step 600
600
#006AEC
oklch(55.5% 0.213 258.8)
-
Step 700
700
#0059C8
oklch(49.1% 0.188 258.7)
-
Step 800
800
#0048A6
oklch(42.6% 0.164 258.9)
-
Step 900
900
#083D87
oklch(37.7% 0.135 258.8)
-
Step 950
950
#08254F
oklch(27.1% 0.085 258.3)
#277FFF 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) | #288DFF | 0.036 |
| Deuteranopia (no green cones) | #007AFC | 0.020 |
| Tritanopia (no blue cones) | #009EB3 | 0.158 |
| Achromatopsia (no color) | #838383 | 0.208 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #277FFF
#277FFF
oklch(61.8% 0.208 258.8)
- #AF7A00
#AF7A00
oklch(61.8% 0.129 78.2)
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 #277FFF, closest first.
No curated palette has a color within ΔE 0.04 of #277FFF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.013
- Dodger Blue #1E90FF ΔE 0.043
- Cerulean Blue #056EEE ΔE 0.052
- Cornflower #6A79F7 ΔE 0.059
- Dark Sky Blue #448EE4 ΔE 0.064
- Royal Blue #4169E1 ΔE 0.067
- Bright Blue #0165FC ΔE 0.067
- Soft Blue #6488EA ΔE 0.067
Use #277FFF 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.