#0143B3
Closest named color: Sapphire (#2138AB). oklch(42.8% 0.187 261.3), rgb(1, 67, 179).
Aa
White text reads best on this color (8.55:1).
About this color
#0143B3 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.187 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.030 away. White text reads best on it, at 8.55:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.187) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.45:1 |
| White text | 8.55:1 |
Values
| HEX | #0143B3 |
| RGB | rgb(1, 67, 179) |
| HSL | hsl(218, 99%, 35%) |
| OKLCH | oklch(42.8% 0.187 261.3) |
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 #0143B3 | 8.55:1 | AAA | Lc -93.0 | Preferred for body text |
| Black text on #0143B3 | 2.45:1 | Fails | Lc 15.6 | Dividers and decoration only |
| #0143B3 text on white | 8.55:1 | AAA | Lc 88.4 | Fine for body text |
| #0143B3 text on black | 2.45:1 | Fails | Lc -13.8 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFF
oklch(93.7% 0.03 260.7)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#699FFF
oklch(70.8% 0.152 261.1)
-
Step 500
500
#3F82FF
oklch(63.1% 0.198 261.5)
-
Step 600
600
#0262FE
oklch(55.5% 0.244 261.4)
-
Step 700
700
#0052D8
oklch(49.1% 0.216 261.3)
-
Step 800
800 (this color)
#0143B3
oklch(42.8% 0.187 261.3)
-
Step 900
900
#0D3A8D
oklch(37.6% 0.146 261.5)
-
Step 950
950
#092353
oklch(27% 0.093 261.3)
#0143B3 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) | #0054B7 | 0.043 |
| Deuteranopia (no green cones) | #0045B1 | 0.006 |
| Tritanopia (no blue cones) | #006174 | 0.143 |
| Achromatopsia (no color) | #4C4C4C | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0143B3
#0143B3
oklch(42.8% 0.187 261.3)
- #674900
#674900
oklch(42.7% 0.088 81.6)
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 #0143B3, closest first.
No curated palette has a color within ΔE 0.04 of #0143B3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.030
- Blue Blue #2242C7 ΔE 0.037
- Cobalt #1E488F ΔE 0.062
- Majorelle Blue #3F37C9 ΔE 0.063
- Blueberry #464196 ΔE 0.077
- Indigo Blue #3A18B1 ΔE 0.081
- Dusk Blue #26538D ΔE 0.082
- True Blue #010FCC ΔE 0.083
Use #0143B3 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.