#003CBF
Closest named color: Blue Blue (#2242C7). oklch(42.6% 0.211 262.8), rgb(0, 60, 191).
Aa
White text reads best on this color (8.75:1).
About this color
#003CBF is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.211 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.029 away. White text reads best on it, at 8.75:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.211) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.39:1 |
| White text | 8.75:1 |
Values
| HEX | #003CBF |
| RGB | rgb(0, 60, 191) |
| HSL | hsl(221, 100%, 37%) |
| OKLCH | oklch(42.6% 0.211 262.8) |
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 #003CBF | 8.75:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #003CBF | 2.39:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #003CBF text on white | 8.75:1 | AAA | Lc 88.7 | Fine for body text |
| #003CBF text on black | 2.39:1 | Fails | Lc -13.4 | 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
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6C9EFF
oklch(70.7% 0.152 262.5)
-
Step 500
500
#4581FF
oklch(63.1% 0.198 262.9)
-
Step 600
600
#1861FF
oklch(55.7% 0.244 262.7)
-
Step 700
700
#004AE6
oklch(49% 0.242 262.8)
-
Step 800
800 (this color)
#003CBF
oklch(42.6% 0.211 262.8)
-
Step 900
900
#0A3697
oklch(37.7% 0.165 262.8)
-
Step 950
950
#082158
oklch(26.9% 0.104 262.9)
#003CBF 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) | #0053C3 | 0.054 |
| Deuteranopia (no green cones) | #0042BD | 0.013 |
| Tritanopia (no blue cones) | #006179 | 0.159 |
| Achromatopsia (no color) | #4B4B4B | 0.211 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003CBF
#003CBF
oklch(42.6% 0.211 262.8)
- #664900
#664900
oklch(42.6% 0.088 82.4)
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 #003CBF, closest first.
No curated palette has a color within ΔE 0.04 of #003CBF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.029
- Sapphire #2138AB ΔE 0.037
- Majorelle Blue #3F37C9 ΔE 0.055
- True Blue #010FCC ΔE 0.062
- Ultramarine Blue #1805DB ΔE 0.068
- Medium Blue #0000CD ΔE 0.070
- Indigo Blue #3A18B1 ΔE 0.074
- Pure Blue #0203E2 ΔE 0.076
Use #003CBF 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.