#1B5199
Closest named color: Dusk Blue (#26538D). oklch(44.1% 0.131 257.1), rgb(27, 81, 153).
Aa
White text reads best on this color (7.82:1).
About this color
#1B5199 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.131 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.023 away. White text reads best on it, at 7.82:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.68:1 |
| White text | 7.82:1 |
Values
| HEX | #1B5199 |
| RGB | rgb(27, 81, 153) |
| HSL | hsl(214, 70%, 35%) |
| OKLCH | oklch(44.1% 0.131 257.1) |
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 #1B5199 | 7.82:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #1B5199 | 2.68:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #1B5199 text on white | 7.82:1 | AAA | Lc 86.7 | Fine for body text |
| #1B5199 text on black | 2.68:1 | Fails | Lc -15.4 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF6
oklch(88.6% 0.043 257.1)
-
Step 300
300
#A2C3F2
oklch(81% 0.076 257.2)
-
Step 400
400
#6EA2EC
oklch(70.7% 0.123 257.3)
-
Step 500
500
#4689E6
oklch(63.2% 0.156 257.2)
-
Step 600
600
#2570D4
oklch(55.5% 0.17 257.3)
-
Step 700
700
#175EB8
oklch(49.2% 0.158 257)
-
Step 800
800 (this color)
#1B5199
oklch(44.1% 0.131 257.1)
-
Step 900
900
#1A4176
oklch(37.8% 0.101 257)
-
Step 950
950
#102645
oklch(26.9% 0.064 257.3)
#1B5199 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) | #2A589C | 0.025 |
| Deuteranopia (no green cones) | #074D98 | 0.016 |
| Tritanopia (no blue cones) | #00626D | 0.100 |
| Achromatopsia (no color) | #525252 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5199
#1B5199
oklch(44.1% 0.131 257.1)
- #6F4B00
#6F4B00
oklch(44.2% 0.092 77.2)
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 #1B5199, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.023
- Cobalt #1E488F ΔE 0.028
- Light Navy #155084 ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.047
- Blueberry #464196 ΔE 0.058
- Twilight #4E518B ΔE 0.060
Use #1B5199 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.