#021FB8
Closest named color: True Blue (#010FCC). oklch(37.7% 0.23 264.4), rgb(2, 31, 184).
Aa
White text reads best on this color (11.10:1).
About this color
#021FB8 is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.230 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is True Blue (#010FCC), ΔE 0.033 away. White text reads best on it, at 11.10:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.230) |
| Temperature | cool |
| Nearest name | True Blue (#010FCC) |
| Black text | 1.89:1 |
| White text | 11.10:1 |
Values
| HEX | #021FB8 |
| RGB | rgb(2, 31, 184) |
| HSL | hsl(230, 98%, 36%) |
| OKLCH | oklch(37.7% 0.23 264.4) |
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 #021FB8 | 11.10:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #021FB8 | 1.89:1 | Fails | Lc 10.2 | Not readable |
| #021FB8 text on white | 11.10:1 | AAA | Lc 93.7 | Preferred for body text |
| #021FB8 text on black | 1.89:1 | Fails | Lc -8.8 | 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 900.
-
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
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4B80FF
oklch(63.1% 0.197 264.4)
-
Step 600
600
#265FFF
oklch(55.6% 0.244 264.4)
-
Step 700
700
#0738FF
oklch(49.2% 0.287 264.4)
-
Step 800
800
#0400EC
oklch(42.7% 0.295 264.4)
-
Step 900
900 (this color)
#021FB8
oklch(37.7% 0.23 264.4)
-
Step 950
950
#02176C
oklch(27% 0.147 264.4)
#021FB8 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) | #0044BC | 0.070 |
| Deuteranopia (no green cones) | #0032B6 | 0.031 |
| Tritanopia (no blue cones) | #00526E | 0.172 |
| Achromatopsia (no color) | #3C3C3C | 0.231 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #021FB8
#021FB8
oklch(37.7% 0.23 264.4)
- #543D00
#543D00
oklch(37.5% 0.077 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 #021FB8, closest first.
No curated palette has a color within ΔE 0.04 of #021FB8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- True Blue #010FCC ΔE 0.033
- Ultramarine #2000B1 ΔE 0.033
- Medium Blue #0000CD ΔE 0.037
- Cobalt Blue #030AA7 ΔE 0.041
- Sapphire #2138AB ΔE 0.056
- Ultramarine Blue #1805DB ΔE 0.057
- Indigo Blue #3A18B1 ΔE 0.062
- Royal #0C1793 ΔE 0.066
Use #021FB8 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.