#1F3DBB
Closest named color: Blue Blue (#2242C7). oklch(43.1% 0.2 266.6), rgb(31, 61, 187).
Aa
White text reads best on this color (8.59:1).
About this color
#1F3DBB is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.200 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.023 away. White text reads best on it, at 8.59:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.200) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.44:1 |
| White text | 8.59:1 |
Values
| HEX | #1F3DBB |
| RGB | rgb(31, 61, 187) |
| HSL | hsl(228, 72%, 43%) |
| OKLCH | oklch(43.1% 0.2 266.6) |
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 #1F3DBB | 8.59:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #1F3DBB | 2.44:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #1F3DBB text on white | 8.59:1 | AAA | Lc 88.6 | Fine for body text |
| #1F3DBB text on black | 2.44:1 | Fails | Lc -13.5 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#759BFF
oklch(70.6% 0.153 266.8)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600
#335DFF
oklch(55.7% 0.244 266.6)
-
Step 700
700
#2446E6
oklch(49% 0.241 266.5)
-
Step 800
800 (this color)
#1F3DBB
oklch(43.1% 0.2 266.6)
-
Step 900
900
#1C3692
oklch(37.7% 0.155 266.5)
-
Step 950
950
#102156
oklch(27.1% 0.099 266.3)
#1F3DBB 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) | #0053BF | 0.050 |
| Deuteranopia (no green cones) | #0045B9 | 0.020 |
| Tritanopia (no blue cones) | #006077 | 0.154 |
| Achromatopsia (no color) | #4C4C4C | 0.200 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3DBB
#1F3DBB
oklch(43.1% 0.2 266.6)
- #654C00
#654C00
oklch(43.1% 0.088 86.8)
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 #1F3DBB, closest first.
No curated palette has a color within ΔE 0.04 of #1F3DBB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.023
- Sapphire #2138AB ΔE 0.029
- Majorelle Blue #3F37C9 ΔE 0.042
- Indigo Blue #3A18B1 ΔE 0.066
- Blue With A Hint Of Purple #533CC6 ΔE 0.070
- True Blue #010FCC ΔE 0.074
- Blurple #5539CC ΔE 0.075
- Cobalt #1E488F ΔE 0.077
Use #1F3DBB 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.