#172EA1
Closest named color: Sapphire (#2138AB). oklch(37.6% 0.185 266.8), rgb(23, 46, 161).
Aa
White text reads best on this color (10.81:1).
About this color
#172EA1 is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.185 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.032 away. White text reads best on it, at 10.81:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.94:1 |
| White text | 10.81:1 |
Values
| HEX | #172EA1 |
| RGB | rgb(23, 46, 161) |
| HSL | hsl(230, 75%, 36%) |
| OKLCH | oklch(37.6% 0.185 266.8) |
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 #172EA1 | 10.81:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #172EA1 | 1.94:1 | Fails | Lc 9.8 | Not readable |
| #172EA1 text on white | 10.81:1 | AAA | Lc 94.1 | Preferred for body text |
| #172EA1 text on black | 1.94:1 | Fails | Lc -8.5 | Not readable |
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 900.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#759BFF
oklch(70.6% 0.153 266.8)
-
Step 500
500
#537EFF
oklch(63.1% 0.197 266.8)
-
Step 600
600
#345CFF
oklch(55.5% 0.245 266.9)
-
Step 700
700
#2133FF
oklch(49.1% 0.287 266.8)
-
Step 800
800
#1A2FCE
oklch(42.8% 0.238 266.8)
-
Step 900
900 (this color)
#172EA1
oklch(37.6% 0.185 266.8)
-
Step 950
950
#0D1D5E
oklch(26.9% 0.117 266.9)
#172EA1 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) | #0044A4 | 0.049 |
| Deuteranopia (no green cones) | #00379F | 0.020 |
| Tritanopia (no blue cones) | #004F64 | 0.142 |
| Achromatopsia (no color) | #3D3D3D | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172EA1
#172EA1
oklch(37.6% 0.185 266.8)
- #533E00
#533E00
oklch(37.6% 0.077 86.9)
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 #172EA1, closest first.
No curated palette has a color within ΔE 0.04 of #172EA1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.032
- Ultramarine #2000B1 ΔE 0.052
- Royal #0C1793 ΔE 0.054
- Indigo Blue #3A18B1 ΔE 0.055
- Cobalt Blue #030AA7 ΔE 0.056
- Cobalt #1E488F ΔE 0.072
- True Blue #010FCC ΔE 0.077
- Imperial Purple #480CA8 ΔE 0.078
Use #172EA1 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.