#278DD7
Closest named color: Water Blue (#0E87CC). oklch(62.3% 0.143 245.7), rgb(39, 141, 215).
Aa
Black text reads best on this color (5.87:1).
About this color
#278DD7 is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.143 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.025 away. Black text reads best on it, at 5.87:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.87:1 |
| White text | 3.57:1 |
Values
| HEX | #278DD7 |
| RGB | rgb(39, 141, 215) |
| HSL | hsl(205, 69%, 50%) |
| OKLCH | oklch(62.3% 0.143 245.7) |
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 #278DD7 | 3.57:1 | AA large text | Lc -68.3 | Content text, not long reading |
| Black text on #278DD7 | 5.87:1 | AA | Lc 41.2 | Non-text elements, placeholder text |
| #278DD7 text on white | 3.57:1 | AA large text | Lc 62.9 | Content text, not long reading |
| #278DD7 text on black | 5.87:1 | AA | Lc -38.8 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C5DCF2
oklch(88.4% 0.039 247.1)
-
Step 300
300
#9BC6EC
oklch(80.9% 0.071 245.5)
-
Step 400
400
#61A7E2
oklch(70.7% 0.112 245.7)
-
Step 500
500 (this color)
#278DD7
oklch(62.3% 0.143 245.7)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#044570
oklch(37.8% 0.094 245.6)
-
Step 950
950
#082941
oklch(27.1% 0.058 244.7)
#278DD7 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) | #6A90DA | 0.057 |
| Deuteranopia (no green cones) | #5180D6 | 0.042 |
| Tritanopia (no blue cones) | #009FA8 | 0.101 |
| Achromatopsia (no color) | #878787 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #278DD7
#278DD7
oklch(62.3% 0.143 245.7)
- #BE7300
#BE7300
oklch(62.3% 0.139 66.1)
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 #278DD7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.025
- Dark Sky Blue #448EE4 ΔE 0.028
- Chefchaouen Blue #4895EF ΔE 0.048
- Cool Blue #4984B8 ΔE 0.050
- Steel Blue #4682B4 ΔE 0.056
- Blue NCS #118AB2 ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.060
- Soft Blue #6488EA ΔE 0.060
Use #278DD7 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.