#17439E
Closest named color: Cobalt (#1E488F). oklch(41.3% 0.156 262.4), rgb(23, 67, 158).
Aa
White text reads best on this color (9.00:1).
About this color
#17439E is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.156 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.030 away. White text reads best on it, at 9.00:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.33:1 |
| White text | 9.00:1 |
Values
| HEX | #17439E |
| RGB | rgb(23, 67, 158) |
| HSL | hsl(220, 75%, 35%) |
| OKLCH | oklch(41.3% 0.156 262.4) |
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 #17439E | 9.00:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #17439E | 2.33:1 | Fails | Lc 13.9 | Not readable |
| #17439E text on white | 9.00:1 | AAA | Lc 90.1 | Preferred for body text |
| #17439E text on black | 2.33:1 | Fails | Lc -12.2 | 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 800.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFC
oklch(88.5% 0.051 262.1)
-
Step 300
300
#A1C1FC
oklch(80.9% 0.091 262.4)
-
Step 400
400
#6E9EFB
oklch(70.6% 0.146 262.6)
-
Step 500
500
#4883F8
oklch(63.1% 0.186 262.3)
-
Step 600
600
#2B69E7
oklch(55.6% 0.202 262.3)
-
Step 700
700
#1F56C9
oklch(49.1% 0.188 262.5)
-
Step 800
800 (this color)
#17439E
oklch(41.3% 0.156 262.4)
-
Step 900
900
#1B3D81
oklch(37.7% 0.122 262.3)
-
Step 950
950
#11244B
oklch(26.9% 0.077 262.8)
#17439E 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) | #004FA1 | 0.031 |
| Deuteranopia (no green cones) | #00439C | 0.011 |
| Tritanopia (no blue cones) | #005A6A | 0.120 |
| Achromatopsia (no color) | #494949 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17439E
#17439E
oklch(41.3% 0.156 262.4)
- #624600
#624600
oklch(41.4% 0.085 82.4)
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 #17439E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.030
- Sapphire #2138AB ΔE 0.033
- Blueberry #464196 ΔE 0.055
- Dusk Blue #26538D ΔE 0.058
- Light Navy #155084 ΔE 0.059
- Twilight Blue #0A437A ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.065
- Blue Blue #2242C7 ΔE 0.067
Use #17439E 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.