#1B4FA2
Closest named color: Cobalt (#1E488F). oklch(44.3% 0.145 259.7), rgb(27, 79, 162).
Aa
White text reads best on this color (7.81:1).
About this color
#1B4FA2 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.145 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.035 away. White text reads best on it, at 7.81:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.68:1 |
| White text | 7.81:1 |
Values
| HEX | #1B4FA2 |
| RGB | rgb(27, 79, 162) |
| HSL | hsl(217, 71%, 37%) |
| OKLCH | oklch(44.3% 0.145 259.7) |
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 #1B4FA2 | 7.81:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #1B4FA2 | 2.68:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #1B4FA2 text on white | 7.81:1 | AAA | Lc 86.6 | Fine for body text |
| #1B4FA2 text on black | 2.68:1 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A0C2F8
oklch(80.9% 0.085 259.5)
-
Step 400
400
#6CA0F5
oklch(70.6% 0.137 259.8)
-
Step 500
500
#4486F1
oklch(63.1% 0.174 259.6)
-
Step 600
600
#246DDF
oklch(55.7% 0.188 259.5)
-
Step 700
700
#175AC2
oklch(49.1% 0.176 259.7)
-
Step 800
800 (this color)
#1B4FA2
oklch(44.3% 0.145 259.7)
-
Step 900
900
#193F7C
oklch(37.7% 0.112 259.6)
-
Step 950
950
#102549
oklch(26.9% 0.072 260.4)
#1B4FA2 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) | #1958A5 | 0.025 |
| Deuteranopia (no green cones) | #004CA0 | 0.016 |
| Tritanopia (no blue cones) | #006371 | 0.111 |
| Achromatopsia (no color) | #525252 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4FA2
#1B4FA2
oklch(44.3% 0.145 259.7)
- #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 #1B4FA2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.035
- Dusk Blue #26538D ΔE 0.039
- Light Navy #155084 ΔE 0.051
- Blueberry #464196 ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.057
- Sapphire #2138AB ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.059
- Light Navy Blue #2E5A88 ΔE 0.060
Use #1B4FA2 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.