#2178AE
Closest named color: Nice Blue (#107AB0). oklch(54.9% 0.115 241.5), rgb(33, 120, 174).
Aa
White text reads best on this color (4.81:1).
About this color
#2178AE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.115 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.007 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.36:1 |
| White text | 4.81:1 |
Values
| HEX | #2178AE |
| RGB | rgb(33, 120, 174) |
| HSL | hsl(203, 68%, 41%) |
| OKLCH | oklch(54.9% 0.115 241.5) |
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 #2178AE | 4.81:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #2178AE | 4.36:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #2178AE text on white | 4.81:1 | AA | Lc 73.0 | Content text, not long reading |
| #2178AE text on black | 4.36:1 | AA large text | Lc -28.7 | 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
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C6E0
oklch(81% 0.052 241.2)
-
Step 400
400
#71A7D0
oklch(70.6% 0.083 242.1)
-
Step 500
500
#4891C4
oklch(63.2% 0.106 241.6)
-
Step 600
600 (this color)
#2178AE
oklch(54.9% 0.115 241.5)
-
Step 700
700
#156798
oklch(49.2% 0.107 241.6)
-
Step 800
800
#16547B
oklch(42.7% 0.089 241.6)
-
Step 900
900
#1A4663
oklch(37.8% 0.069 241)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#2178AE 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) | #5F79B0 | 0.056 |
| Deuteranopia (no green cones) | #4B6CAD | 0.044 |
| Tritanopia (no blue cones) | #00858B | 0.077 |
| Achromatopsia (no color) | #727272 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2178AE
#2178AE
oklch(54.9% 0.115 241.5)
- #A05F1A
#A05F1A
oklch(54.8% 0.115 61.6)
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 #2178AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.007
- Flat Blue #3C73A8 ΔE 0.021
- Muted Blue #3B719F ΔE 0.029
- Windows Blue #3778BF ΔE 0.032
- Ocean Blue #03719C ΔE 0.036
- Dull Blue #49759C ΔE 0.038
- Cerulean #457B9D ΔE 0.039
- French Blue #436BAD ΔE 0.041
Use #2178AE 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.