#2878B4
Closest named color: Nice Blue (#107AB0). oklch(55.4% 0.12 245.5), rgb(40, 120, 180).
Aa
White text reads best on this color (4.73:1).
About this color
#2878B4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.120 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.014 away. White text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.43:1 |
| White text | 4.73:1 |
Values
| HEX | #2878B4 |
| RGB | rgb(40, 120, 180) |
| HSL | hsl(206, 64%, 43%) |
| OKLCH | oklch(55.4% 0.12 245.5) |
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 #2878B4 | 4.73:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #2878B4 | 4.43:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #2878B4 text on white | 4.73:1 | AA | Lc 72.5 | Content text, not long reading |
| #2878B4 text on black | 4.43:1 | AA large text | Lc -29.2 | Dividers and decoration only |
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 600.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A4C5E2
oklch(80.9% 0.054 245.1)
-
Step 400
400
#72A6D3
oklch(70.6% 0.086 245.5)
-
Step 500
500
#4A8FC8
oklch(63% 0.111 245.8)
-
Step 600
600 (this color)
#2878B4
oklch(55.4% 0.12 245.5)
-
Step 700
700
#1A659C
oklch(49.1% 0.113 245.8)
-
Step 800
800
#19537E
oklch(42.7% 0.092 245.2)
-
Step 900
900
#1C4565
oklch(37.7% 0.072 245)
-
Step 950
950
#12283B
oklch(26.9% 0.045 246.6)
#2878B4 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) | #5C7AB7 | 0.049 |
| Deuteranopia (no green cones) | #486DB3 | 0.037 |
| Tritanopia (no blue cones) | #00878E | 0.086 |
| Achromatopsia (no color) | #737373 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2878B4
#2878B4
oklch(55.4% 0.12 245.5)
- #A1620B
#A1620B
oklch(55.4% 0.12 66)
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 #2878B4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.014
- Windows Blue #3778BF ΔE 0.021
- Flat Blue #3C73A8 ΔE 0.023
- Muted Blue #3B719F ΔE 0.035
- French Blue #436BAD ΔE 0.038
- Steel Blue #4682B4 ΔE 0.040
- Mid Blue #276AB3 ΔE 0.040
- Dull Blue #49759C ΔE 0.042
Use #2878B4 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.