#183EB7
Closest named color: Sapphire (#2138AB). oklch(42.6% 0.195 265), rgb(24, 62, 183).
Aa
White text reads best on this color (8.70:1).
About this color
#183EB7 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.195 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.024 away. White text reads best on it, at 8.70:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.195) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.41:1 |
| White text | 8.70:1 |
Values
| HEX | #183EB7 |
| RGB | rgb(24, 62, 183) |
| HSL | hsl(226, 77%, 41%) |
| OKLCH | oklch(42.6% 0.195 265) |
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 #183EB7 | 8.70:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #183EB7 | 2.41:1 | Fails | Lc 15.0 | Dividers and decoration only |
| #183EB7 text on white | 8.70:1 | AAA | Lc 89.0 | Fine for body text |
| #183EB7 text on black | 2.41:1 | Fails | Lc -13.2 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#729CFF
oklch(70.6% 0.153 265.4)
-
Step 500
500
#4D7FFF
oklch(63% 0.198 265.1)
-
Step 600
600
#2A5EFF
oklch(55.6% 0.245 265.1)
-
Step 700
700
#1C4AE3
oklch(49.1% 0.235 265)
-
Step 800
800 (this color)
#183EB7
oklch(42.6% 0.195 265)
-
Step 900
900
#183790
oklch(37.6% 0.152 265)
-
Step 950
950
#0E2255
oklch(27.1% 0.096 264.6)
#183EB7 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) | #0053BB | 0.049 |
| Deuteranopia (no green cones) | #0044B5 | 0.015 |
| Tritanopia (no blue cones) | #005F75 | 0.149 |
| Achromatopsia (no color) | #4B4B4B | 0.195 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183EB7
#183EB7
oklch(42.6% 0.195 265)
- #654A00
#654A00
oklch(42.7% 0.087 84.5)
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 #183EB7, closest first.
No curated palette has a color within ΔE 0.04 of #183EB7.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.024
- Blue Blue #2242C7 ΔE 0.030
- Majorelle Blue #3F37C9 ΔE 0.050
- Indigo Blue #3A18B1 ΔE 0.068
- Cobalt #1E488F ΔE 0.070
- True Blue #010FCC ΔE 0.075
- Blueberry #464196 ΔE 0.076
- Blue With A Hint Of Purple #533CC6 ΔE 0.077
Use #183EB7 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.