#1C4F9F
Closest named color: Cobalt (#1E488F). oklch(44.1% 0.141 259.4), rgb(28, 79, 159).
Aa
White text reads best on this color (7.86:1).
About this color
#1C4F9F is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.141 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.031 away. White text reads best on it, at 7.86:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.66:1 |
| White text | 7.86:1 |
Values
| HEX | #1C4F9F |
| RGB | rgb(28, 79, 159) |
| HSL | hsl(217, 70%, 37%) |
| OKLCH | oklch(44.1% 0.141 259.4) |
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 #1C4F9F | 7.86:1 | AAA | Lc -91.6 | Preferred for body text |
| Black text on #1C4F9F | 2.66:1 | Fails | Lc 17.2 | Dividers and decoration only |
| #1C4F9F text on white | 7.86:1 | AAA | Lc 86.8 | Fine for body text |
| #1C4F9F text on black | 2.66:1 | Fails | Lc -15.3 | 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
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A1C2F6
oklch(80.8% 0.082 259.4)
-
Step 400
400
#6EA1F2
oklch(70.8% 0.131 259.3)
-
Step 500
500
#4687ED
oklch(63.2% 0.167 259.1)
-
Step 600
600
#276EDC
oklch(55.7% 0.183 259.3)
-
Step 700
700
#195BBF
oklch(49.2% 0.17 259.3)
-
Step 800
800 (this color)
#1C4F9F
oklch(44.1% 0.141 259.4)
-
Step 900
900
#1A3F7B
oklch(37.6% 0.111 259.7)
-
Step 950
950
#102648
oklch(27.1% 0.069 258.9)
#1C4F9F 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) | #1E58A2 | 0.025 |
| Deuteranopia (no green cones) | #004C9D | 0.017 |
| Tritanopia (no blue cones) | #00626F | 0.108 |
| Achromatopsia (no color) | #525252 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C4F9F
#1C4F9F
oklch(44.1% 0.141 259.4)
- #6D4C00
#6D4C00
oklch(44.1% 0.091 79.9)
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 #1C4F9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.031
- Dusk Blue #26538D ΔE 0.034
- Light Navy #155084 ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.054
- Blueberry #464196 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.056
- Sapphire #2138AB ΔE 0.060
Use #1C4F9F 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.