#213A88
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.134 266.5), rgb(33, 58, 136).
Aa
White text reads best on this color (10.36:1).
About this color
#213A88 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.134 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.039 away. White text reads best on it, at 10.36:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.02:1 |
| White text | 10.36:1 |
Values
| HEX | #213A88 |
| RGB | rgb(33, 58, 136) |
| HSL | hsl(225, 61%, 33%) |
| OKLCH | oklch(37.9% 0.134 266.5) |
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 #213A88 | 10.36:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #213A88 | 2.02:1 | Fails | Lc 10.3 | Not readable |
| #213A88 text on white | 10.36:1 | AAA | Lc 93.6 | Preferred for body text |
| #213A88 text on black | 2.02:1 | Fails | Lc -8.9 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
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
#759CFF
oklch(70.8% 0.151 266.4)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600
#3761F3
oklch(55.5% 0.224 266.5)
-
Step 700
700
#2B4FD4
oklch(49.1% 0.208 266.5)
-
Step 800
800
#2442AB
oklch(42.7% 0.172 266.6)
-
Step 900
900 (this color)
#213A88
oklch(37.9% 0.134 266.5)
-
Step 950
950
#13234F
oklch(27.1% 0.084 265.9)
#213A88 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) | #00458B | 0.032 |
| Deuteranopia (no green cones) | #003B86 | 0.022 |
| Tritanopia (no blue cones) | #004D5B | 0.106 |
| Achromatopsia (no color) | #404040 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #213A88
#213A88
oklch(37.9% 0.134 266.5)
- #543E00
#543E00
oklch(37.8% 0.077 85.9)
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 #213A88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.039
- Cobalt #1E488F ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.057
- Sapphire #2138AB ΔE 0.058
- Marine Blue #01386A ΔE 0.058
- Blueberry #464196 ΔE 0.061
- Light Navy #155084 ΔE 0.063
- Dusk Blue #26538D ΔE 0.071
Use #213A88 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.