#212F9C
Closest named color: Sapphire (#2138AB). oklch(37.6% 0.175 269.5), rgb(33, 47, 156).
Aa
White text reads best on this color (10.76:1).
About this color
#212F9C is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.175 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.033 away. White text reads best on it, at 10.76:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.95:1 |
| White text | 10.76:1 |
Values
| HEX | #212F9C |
| RGB | rgb(33, 47, 156) |
| HSL | hsl(233, 65%, 37%) |
| OKLCH | oklch(37.6% 0.175 269.5) |
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 #212F9C | 10.76:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #212F9C | 1.95:1 | Fails | Lc 9.8 | Not readable |
| #212F9C text on white | 10.76:1 | AAA | Lc 94.1 | Preferred for body text |
| #212F9C text on black | 1.95:1 | Fails | Lc -8.4 | 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 900.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2EAFF
oklch(93.7% 0.03 269.1)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7B9AFF
oklch(70.8% 0.152 269.4)
-
Step 500
500
#5B7CFF
oklch(63.1% 0.198 269.4)
-
Step 600
600
#4059FF
oklch(55.5% 0.245 269.5)
-
Step 700
700
#3137F6
oklch(49.1% 0.271 269.6)
-
Step 800
800
#2731C7
oklch(42.8% 0.225 269.5)
-
Step 900
900 (this color)
#212F9C
oklch(37.6% 0.175 269.5)
-
Step 950
950
#131E5B
oklch(27.1% 0.11 269.6)
#212F9C 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) | #00449F | 0.049 |
| Deuteranopia (no green cones) | #00389A | 0.026 |
| Tritanopia (no blue cones) | #004D61 | 0.137 |
| Achromatopsia (no color) | #3E3E3E | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #212F9C
#212F9C
oklch(37.6% 0.175 269.5)
- #523F00
#523F00
oklch(37.8% 0.077 89.3)
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 #212F9C, closest first.
No curated palette has a color within ΔE 0.04 of #212F9C.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.033
- Indigo Blue #3A18B1 ΔE 0.053
- Royal #0C1793 ΔE 0.057
- Ultramarine #2000B1 ΔE 0.060
- Cobalt Blue #030AA7 ΔE 0.065
- Cobalt #1E488F ΔE 0.066
- Imperial Purple #480CA8 ΔE 0.072
- Blueberry #464196 ΔE 0.073
Use #212F9C 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.