#1F3F9C
Closest named color: Sapphire (#2138AB). oklch(40.6% 0.156 265.4), rgb(31, 63, 156).
Aa
White text reads best on this color (9.33:1).
About this color
#1F3F9C is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.156 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.029 away. White text reads best on it, at 9.33:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.24:1 |
| White text | 9.33:1 |
Values
| HEX | #1F3F9C |
| RGB | rgb(31, 63, 156) |
| HSL | hsl(225, 67%, 37%) |
| OKLCH | oklch(40.6% 0.156 265.4) |
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 #1F3F9C | 9.33:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #1F3F9C | 2.24:1 | Fails | Lc 13.0 | Not readable |
| #1F3F9C text on white | 9.33:1 | AAA | Lc 91.0 | Preferred for body text |
| #1F3F9C text on black | 2.24:1 | Fails | Lc -11.3 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C9D9FC
oklch(88.5% 0.051 265.9)
-
Step 300
300
#A4C0FC
oklch(80.9% 0.091 265)
-
Step 400
400
#749DFB
oklch(70.7% 0.145 265.1)
-
Step 500
500
#5281F9
oklch(63.2% 0.186 265.3)
-
Step 600
600
#3866E8
oklch(55.6% 0.203 265.4)
-
Step 700
700
#2B54CA
oklch(49.1% 0.189 265.3)
-
Step 800
800 (this color)
#1F3F9C
oklch(40.6% 0.156 265.4)
-
Step 900
900
#213C81
oklch(37.7% 0.121 265)
-
Step 950
950
#14244C
oklch(27.1% 0.077 265.2)
#1F3F9C 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) | #004D9F | 0.036 |
| Deuteranopia (no green cones) | #00419A | 0.018 |
| Tritanopia (no blue cones) | #005767 | 0.123 |
| Achromatopsia (no color) | #474747 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3F9C
#1F3F9C
oklch(40.6% 0.156 265.4)
- #5D4500
#5D4500
oklch(40.5% 0.083 85.9)
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 #1F3F9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.029
- Cobalt #1E488F ΔE 0.033
- Blueberry #464196 ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.060
- Twilight Blue #0A437A ΔE 0.061
- Dusk Blue #26538D ΔE 0.064
- Light Navy #155084 ΔE 0.065
- Blue Blue #2242C7 ΔE 0.070
Use #1F3F9C 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.