#133FB8
Closest named color: Sapphire (#2138AB). oklch(42.8% 0.196 264.1), rgb(19, 63, 184).
Aa
White text reads best on this color (8.63:1).
About this color
#133FB8 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.196 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.027 away. White text reads best on it, at 8.63:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.43:1 |
| White text | 8.63:1 |
Values
| HEX | #133FB8 |
| RGB | rgb(19, 63, 184) |
| HSL | hsl(224, 81%, 40%) |
| OKLCH | oklch(42.8% 0.196 264.1) |
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 #133FB8 | 8.63:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #133FB8 | 2.43:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #133FB8 text on white | 8.63:1 | AAA | Lc 88.7 | Fine for body text |
| #133FB8 text on black | 2.43:1 | Fails | Lc -13.5 | 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
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7DAFF
oklch(88.6% 0.055 263.7)
-
Step 300
300
#A1C0FF
oklch(80.8% 0.096 264.1)
-
Step 400
400
#6F9DFF
oklch(70.7% 0.152 263.9)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600
#245FFF
oklch(55.6% 0.245 264.2)
-
Step 700
700
#154AE4
oklch(49.1% 0.238 264.2)
-
Step 800
800 (this color)
#133FB8
oklch(42.8% 0.196 264.1)
-
Step 900
900
#153891
oklch(37.8% 0.153 264)
-
Step 950
950
#0D2255
oklch(27.1% 0.097 264.1)
#133FB8 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) | #0053BC | 0.047 |
| Deuteranopia (no green cones) | #0044B6 | 0.012 |
| Tritanopia (no blue cones) | #006076 | 0.149 |
| Achromatopsia (no color) | #4C4C4C | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133FB8
#133FB8
oklch(42.8% 0.196 264.1)
- #664A00
#664A00
oklch(42.8% 0.088 83.6)
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 #133FB8, closest first.
No curated palette has a color within ΔE 0.04 of #133FB8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.027
- Blue Blue #2242C7 ΔE 0.029
- Majorelle Blue #3F37C9 ΔE 0.052
- Cobalt #1E488F ΔE 0.071
- Indigo Blue #3A18B1 ΔE 0.071
- True Blue #010FCC ΔE 0.075
- Blue With A Hint Of Purple #533CC6 ΔE 0.078
- Blueberry #464196 ΔE 0.079
Use #133FB8 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.