#1F55A1
Closest named color: Dusk Blue (#26538D). oklch(45.7% 0.136 257.8), rgb(31, 85, 161).
Aa
White text reads best on this color (7.31:1).
About this color
#1F55A1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.136 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.032 away. White text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.87:1 |
| White text | 7.31:1 |
Values
| HEX | #1F55A1 |
| RGB | rgb(31, 85, 161) |
| HSL | hsl(215, 68%, 38%) |
| OKLCH | oklch(45.7% 0.136 257.8) |
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 #1F55A1 | 7.31:1 | AAA | Lc -89.9 | Fine for body text |
| Black text on #1F55A1 | 2.87:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #1F55A1 text on white | 7.31:1 | AAA | Lc 85.0 | Fine for body text |
| #1F55A1 text on black | 2.87:1 | Fails | Lc -17.0 | 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
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#A1C3F4
oklch(81% 0.079 257.5)
-
Step 400
400
#6DA2EF
oklch(70.8% 0.127 257.7)
-
Step 500
500
#4588E9
oklch(63.1% 0.161 257.9)
-
Step 600
600
#236FD8
oklch(55.5% 0.177 257.9)
-
Step 700
700
#155CBB
oklch(49% 0.164 257.9)
-
Step 800
800 (this color)
#1F55A1
oklch(45.7% 0.136 257.8)
-
Step 900
900
#194078
oklch(37.6% 0.105 257.9)
-
Step 950
950
#102646
oklch(27% 0.066 257.9)
#1F55A1 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) | #2C5DA4 | 0.027 |
| Deuteranopia (no green cones) | #06519F | 0.018 |
| Tritanopia (no blue cones) | #006773 | 0.104 |
| Achromatopsia (no color) | #565656 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F55A1
#1F55A1
oklch(45.7% 0.136 257.8)
- #744F00
#744F00
oklch(45.7% 0.095 77.7)
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 #1F55A1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.032
- Denim Blue #3B5B92 ΔE 0.042
- Cobalt #1E488F ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.047
- Light Navy #155084 ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.054
- Dusky Blue #475F94 ΔE 0.058
- Peacock Blue #016795 ΔE 0.059
Use #1F55A1 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.