#1C509E
Closest named color: Dusk Blue (#26538D). oklch(44.3% 0.138 258.8), rgb(28, 80, 158).
Aa
White text reads best on this color (7.80:1).
About this color
#1C509E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.138 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.031 away. White text reads best on it, at 7.80:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.69:1 |
| White text | 7.80:1 |
Values
| HEX | #1C509E |
| RGB | rgb(28, 80, 158) |
| HSL | hsl(216, 70%, 36%) |
| OKLCH | oklch(44.3% 0.138 258.8) |
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 #1C509E | 7.80:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #1C509E | 2.69:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #1C509E text on white | 7.80:1 | AAA | Lc 86.6 | Fine for body text |
| #1C509E text on black | 2.69:1 | Fails | Lc -15.5 | 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 800.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DBF7
oklch(88.6% 0.044 258)
-
Step 300
300
#A1C2F5
oklch(80.8% 0.081 259)
-
Step 400
400
#6EA1F1
oklch(70.7% 0.13 259.1)
-
Step 500
500
#4687EC
oklch(63.1% 0.166 259)
-
Step 600
600
#266EDA
oklch(55.5% 0.18 258.9)
-
Step 700
700
#185CBD
oklch(49.2% 0.167 258.6)
-
Step 800
800 (this color)
#1C509E
oklch(44.3% 0.138 258.8)
-
Step 900
900
#1A407A
oklch(37.8% 0.108 258.8)
-
Step 950
950
#102647
oklch(27% 0.068 258.4)
#1C509E 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) | #2258A1 | 0.024 |
| Deuteranopia (no green cones) | #004D9C | 0.017 |
| Tritanopia (no blue cones) | #00636F | 0.107 |
| Achromatopsia (no color) | #525252 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C509E
#1C509E
oklch(44.3% 0.138 258.8)
- #6E4C00
#6E4C00
oklch(44.2% 0.092 79.1)
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 #1C509E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.031
- Cobalt #1E488F ΔE 0.031
- Light Navy #155084 ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.052
- Light Navy Blue #2E5A88 ΔE 0.053
- Blueberry #464196 ΔE 0.056
- Sapphire #2138AB ΔE 0.063
Use #1C509E 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.