#213FB3
Closest named color: Sapphire (#2138AB). oklch(42.7% 0.187 266.6), rgb(33, 63, 179).
Aa
White text reads best on this color (8.65:1).
About this color
#213FB3 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.187 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.021 away. White text reads best on it, at 8.65:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.187) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.42:1 |
| White text | 8.65:1 |
Values
| HEX | #213FB3 |
| RGB | rgb(33, 63, 179) |
| HSL | hsl(228, 69%, 42%) |
| OKLCH | oklch(42.7% 0.187 266.6) |
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 #213FB3 | 8.65:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #213FB3 | 2.42:1 | Fails | Lc 15.0 | Dividers and decoration only |
| #213FB3 text on white | 8.65:1 | AAA | Lc 88.9 | Fine for body text |
| #213FB3 text on black | 2.42:1 | Fails | Lc -13.3 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
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
#759BFF
oklch(70.6% 0.153 266.8)
-
Step 500
500
#537EFF
oklch(63.1% 0.197 266.8)
-
Step 600
600
#335DFE
oklch(55.6% 0.243 266.5)
-
Step 700
700
#284BDE
oklch(49.2% 0.226 266.7)
-
Step 800
800 (this color)
#213FB3
oklch(42.7% 0.187 266.6)
-
Step 900
900
#1E388D
oklch(37.8% 0.145 266.4)
-
Step 950
950
#122253
oklch(27.1% 0.092 266.6)
#213FB3 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) | #0053B7 | 0.047 |
| Deuteranopia (no green cones) | #0045B1 | 0.020 |
| Tritanopia (no blue cones) | #005E73 | 0.145 |
| Achromatopsia (no color) | #4C4C4C | 0.187 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #213FB3
#213FB3
oklch(42.7% 0.187 266.6)
- #644B00
#644B00
oklch(42.8% 0.087 86.6)
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 #213FB3, closest first.
No curated palette has a color within ΔE 0.04 of #213FB3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.021
- Blue Blue #2242C7 ΔE 0.033
- Majorelle Blue #3F37C9 ΔE 0.050
- Cobalt #1E488F ΔE 0.064
- Blueberry #464196 ΔE 0.066
- Indigo Blue #3A18B1 ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.072
- Blurple #5539CC ΔE 0.079
Use #213FB3 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.