#1F4C8B
Closest named color: Cobalt (#1E488F). oklch(42.1% 0.116 257.5), rgb(31, 76, 139).
Aa
White text reads best on this color (8.51:1).
About this color
#1F4C8B is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.116 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.014 away. White text reads best on it, at 8.51:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.46:1 |
| White text | 8.51:1 |
Values
| HEX | #1F4C8B |
| RGB | rgb(31, 76, 139) |
| HSL | hsl(215, 64%, 33%) |
| OKLCH | oklch(42.1% 0.116 257.5) |
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 #1F4C8B | 8.51:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #1F4C8B | 2.46:1 | Fails | Lc 15.0 | Dividers and decoration only |
| #1F4C8B text on white | 8.51:1 | AAA | Lc 89.0 | Fine for body text |
| #1F4C8B text on black | 2.46:1 | Fails | Lc -13.3 | Not readable |
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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADBF2
oklch(88.6% 0.037 256)
-
Step 300
300
#A6C3ED
oklch(81% 0.068 257.6)
-
Step 400
400
#75A2E4
oklch(70.7% 0.109 257.8)
-
Step 500
500
#508ADC
oklch(63.2% 0.138 257.3)
-
Step 600
600
#3372C9
oklch(55.6% 0.15 257.3)
-
Step 700
700
#265FAE
oklch(49.1% 0.139 257.5)
-
Step 800
800 (this color)
#1F4C8B
oklch(42.1% 0.116 257.5)
-
Step 900
900
#204171
oklch(37.7% 0.091 257.9)
-
Step 950
950
#132742
oklch(27.1% 0.057 256.4)
#1F4C8B 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) | #2C528D | 0.023 |
| Deuteranopia (no green cones) | #17488A | 0.014 |
| Tritanopia (no blue cones) | #005B64 | 0.091 |
| Achromatopsia (no color) | #4D4D4D | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4C8B
#1F4C8B
oklch(42.1% 0.116 257.5)
- #674600
#674600
oklch(42% 0.088 78)
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 #1F4C8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.014
- Light Navy #155084 ΔE 0.019
- Dusk Blue #26538D ΔE 0.022
- Deep Sea Blue #015482 ΔE 0.032
- Twilight Blue #0A437A ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.056
- Blueberry #464196 ΔE 0.056
Use #1F4C8B 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.