#172FA1
Closest named color: Sapphire (#2138AB). oklch(37.7% 0.184 266.7), rgb(23, 47, 161).
Aa
White text reads best on this color (10.72:1).
About this color
#172FA1 is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.184 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.030 away. White text reads best on it, at 10.72:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.184) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.95:1 |
| White text | 10.72:1 |
Values
| HEX | #172FA1 |
| RGB | rgb(23, 47, 161) |
| HSL | hsl(230, 75%, 36%) |
| OKLCH | oklch(37.7% 0.184 266.7) |
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 #172FA1 | 10.72:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #172FA1 | 1.95:1 | Fails | Lc 10.0 | Not readable |
| #172FA1 text on white | 10.72:1 | AAA | Lc 93.9 | Preferred for body text |
| #172FA1 text on black | 1.95:1 | Fails | Lc -8.6 | 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
#335CFF
oklch(55.5% 0.245 266.7)
-
Step 700
700
#2034FE
oklch(49% 0.285 266.7)
-
Step 800
800
#192FCD
oklch(42.7% 0.237 266.6)
-
Step 900
900 (this color)
#172FA1
oklch(37.7% 0.184 266.7)
-
Step 950
950
#0D1E5E
oklch(27.1% 0.116 266.6)
#172FA1 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) | #0045A4 | 0.050 |
| Deuteranopia (no green cones) | #00379F | 0.019 |
| Tritanopia (no blue cones) | #004F64 | 0.141 |
| Achromatopsia (no color) | #3E3E3E | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172FA1
#172FA1
oklch(37.7% 0.184 266.7)
- #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 #172FA1, closest first.
No curated palette has a color within ΔE 0.04 of #172FA1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.030
- Ultramarine #2000B1 ΔE 0.054
- Indigo Blue #3A18B1 ΔE 0.055
- Royal #0C1793 ΔE 0.056
- Cobalt Blue #030AA7 ΔE 0.058
- Cobalt #1E488F ΔE 0.070
- True Blue #010FCC ΔE 0.077
- Imperial Purple #480CA8 ΔE 0.079
Use #172FA1 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.