#1931CB
Closest named color: Blue Blue (#2242C7). oklch(42.7% 0.232 266.5), rgb(25, 49, 203).
Aa
White text reads best on this color (8.96:1).
About this color
#1931CB is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.232 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.035 away. White text reads best on it, at 8.96:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.232) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.34:1 |
| White text | 8.96:1 |
Values
| HEX | #1931CB |
| RGB | rgb(25, 49, 203) |
| HSL | hsl(232, 78%, 45%) |
| OKLCH | oklch(42.7% 0.232 266.5) |
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 #1931CB | 8.96:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #1931CB | 2.34:1 | Fails | Lc 14.8 | Not readable |
| #1931CB text on white | 8.96:1 | AAA | Lc 89.2 | Fine for body text |
| #1931CB text on black | 2.34:1 | Fails | Lc -13.0 | 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
#E0EAFF
oklch(93.6% 0.03 265.3)
-
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
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600
#335DFF
oklch(55.7% 0.244 266.6)
-
Step 700
700
#1F37FC
oklch(49.1% 0.281 266.5)
-
Step 800
800 (this color)
#1931CB
oklch(42.7% 0.232 266.5)
-
Step 900
900
#17309F
oklch(37.7% 0.18 266.5)
-
Step 950
950
#0D1E5D
oklch(27% 0.114 266.6)
#1931CB 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) | #0052CF | 0.066 |
| Deuteranopia (no green cones) | #0040C8 | 0.027 |
| Tritanopia (no blue cones) | #00607C | 0.177 |
| Achromatopsia (no color) | #494949 | 0.233 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1931CB
#1931CB
oklch(42.7% 0.232 266.5)
- #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 #1931CB, closest first.
No curated palette has a color within ΔE 0.04 of #1931CB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.035
- Ultramarine Blue #1805DB ΔE 0.045
- Majorelle Blue #3F37C9 ΔE 0.047
- True Blue #010FCC ΔE 0.048
- Sapphire #2138AB ΔE 0.052
- Pure Blue #0203E2 ΔE 0.055
- Medium Blue #0000CD ΔE 0.056
- Indigo Blue #3A18B1 ΔE 0.067
Use #1931CB 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.