#1F40A5
Closest named color: Sapphire (#2138AB). oklch(41.6% 0.167 265.5), rgb(31, 64, 165).
Aa
White text reads best on this color (8.99:1).
About this color
#1F40A5 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.167 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.020 away. White text reads best on it, at 8.99:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.33:1 |
| White text | 8.99:1 |
Values
| HEX | #1F40A5 |
| RGB | rgb(31, 64, 165) |
| HSL | hsl(225, 68%, 38%) |
| OKLCH | oklch(41.6% 0.167 265.5) |
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 #1F40A5 | 8.99:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #1F40A5 | 2.33:1 | Fails | Lc 14.0 | Not readable |
| #1F40A5 text on white | 8.99:1 | AAA | Lc 90.0 | Preferred for body text |
| #1F40A5 text on black | 2.33:1 | Fails | Lc -12.3 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C8D9FE
oklch(88.5% 0.054 265.8)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#4F7FFF
oklch(63.1% 0.197 265.6)
-
Step 600
600
#3564F0
oklch(55.7% 0.217 265.5)
-
Step 700
700
#2851D1
oklch(49.1% 0.203 265.5)
-
Step 800
800 (this color)
#1F40A5
oklch(41.6% 0.167 265.5)
-
Step 900
900
#1F3A86
oklch(37.6% 0.132 265.6)
-
Step 950
950
#13234E
oklch(27% 0.082 265.8)
#1F40A5 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) | #0050A8 | 0.040 |
| Deuteranopia (no green cones) | #0043A3 | 0.017 |
| Tritanopia (no blue cones) | #005A6C | 0.130 |
| Achromatopsia (no color) | #494949 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F40A5
#1F40A5
oklch(41.6% 0.167 265.5)
- #614800
#614800
oklch(41.7% 0.085 85.8)
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 #1F40A5, closest first.
No curated palette has a color within ΔE 0.04 of #1F40A5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.020
- Cobalt #1E488F ΔE 0.043
- Blueberry #464196 ΔE 0.055
- Blue Blue #2242C7 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.067
- Dusk Blue #26538D ΔE 0.069
- Majorelle Blue #3F37C9 ΔE 0.069
- Indigo Blue #3A18B1 ΔE 0.072
Use #1F40A5 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.