#2178A1
Closest named color: Nice Blue (#107AB0). oklch(54.2% 0.101 234.2), rgb(33, 120, 161).
Aa
White text reads best on this color (4.92:1).
About this color
#2178A1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.101 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.023 away. White text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.26:1 |
| White text | 4.92:1 |
Values
| HEX | #2178A1 |
| RGB | rgb(33, 120, 161) |
| HSL | hsl(199, 66%, 38%) |
| OKLCH | oklch(54.2% 0.101 234.2) |
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 #2178A1 | 4.92:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #2178A1 | 4.26:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #2178A1 text on white | 4.92:1 | AA | Lc 73.7 | Content text, not long reading |
| #2178A1 text on black | 4.26:1 | AA large text | Lc -28.0 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A5C6DA
oklch(80.9% 0.045 234.7)
-
Step 400
400
#72A9C8
oklch(70.8% 0.073 233.9)
-
Step 500
500
#4A93B9
oklch(63.2% 0.093 233.6)
-
Step 600
600 (this color)
#2178A1
oklch(54.2% 0.101 234.2)
-
Step 700
700
#17698E
oklch(49.2% 0.094 233.8)
-
Step 800
800
#185573
oklch(42.6% 0.078 234.7)
-
Step 900
900
#1B475D
oklch(37.8% 0.061 233.4)
-
Step 950
950
#112936
oklch(26.8% 0.039 234.4)
#2178A1 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) | #6477A3 | 0.063 |
| Deuteranopia (no green cones) | #536BA0 | 0.053 |
| Tritanopia (no blue cones) | #008386 | 0.063 |
| Achromatopsia (no color) | #707070 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2178A1
#2178A1
oklch(54.2% 0.101 234.2)
- #9C5D31
#9C5D31
oklch(54.1% 0.101 53.7)
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 #2178A1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.023
- Muted Blue #3B719F ΔE 0.024
- Sea Blue #047495 ΔE 0.025
- Ocean Blue #03719C ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.027
- Cerulean #457B9D ΔE 0.030
- Ocean #017B92 ΔE 0.030
- Dull Blue #49759C ΔE 0.031
Use #2178A1 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.