#1F3F9E
Closest named color: Sapphire (#2138AB). oklch(40.7% 0.159 265.5), rgb(31, 63, 158).
Aa
White text reads best on this color (9.27:1).
About this color
#1F3F9E is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.159 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.026 away. White text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #1F3F9E |
| RGB | rgb(31, 63, 158) |
| HSL | hsl(225, 67%, 37%) |
| OKLCH | oklch(40.7% 0.159 265.5) |
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 #1F3F9E | 9.27:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #1F3F9E | 2.26:1 | Fails | Lc 13.1 | Not readable |
| #1F3F9E text on white | 9.27:1 | AAA | Lc 90.8 | Preferred for body text |
| #1F3F9E text on black | 2.26:1 | Fails | Lc -11.5 | 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
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FC
oklch(88.5% 0.051 265.9)
-
Step 300
300
#A4C0FE
oklch(81% 0.093 265.6)
-
Step 400
400
#749CFD
oklch(70.6% 0.149 265.8)
-
Step 500
500
#5180FB
oklch(63.1% 0.19 265.5)
-
Step 600
600
#3766EA
oklch(55.7% 0.206 265.3)
-
Step 700
700
#2B53CB
oklch(49% 0.192 265.5)
-
Step 800
800 (this color)
#1F3F9E
oklch(40.7% 0.159 265.5)
-
Step 900
900
#213B82
oklch(37.6% 0.124 265.6)
-
Step 950
950
#14234C
oklch(26.9% 0.078 266.1)
#1F3F9E 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) | #004DA1 | 0.036 |
| Deuteranopia (no green cones) | #00419C | 0.017 |
| Tritanopia (no blue cones) | #005768 | 0.124 |
| Achromatopsia (no color) | #474747 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3F9E
#1F3F9E
oklch(40.7% 0.159 265.5)
- #5E4500
#5E4500
oklch(40.7% 0.083 84.9)
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 #1F3F9E, closest first.
No curated palette has a color within ΔE 0.04 of #1F3F9E.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.026
- Cobalt #1E488F ΔE 0.035
- Blueberry #464196 ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.061
- Twilight Blue #0A437A ΔE 0.064
- Dusk Blue #26538D ΔE 0.065
- Light Navy #155084 ΔE 0.067
- Blue Blue #2242C7 ΔE 0.067
Use #1F3F9E 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.