#313999
Closest named color: Sapphire (#2138AB). oklch(40% 0.155 273.5), rgb(49, 57, 153).
Aa
White text reads best on this color (9.65:1).
About this color
#313999 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.155 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.035 away. White text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #313999 |
| RGB | rgb(49, 57, 153) |
| HSL | hsl(235, 51%, 40%) |
| OKLCH | oklch(40% 0.155 273.5) |
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 #313999 | 9.65:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #313999 | 2.17:1 | Fails | Lc 12.1 | Not readable |
| #313999 text on white | 9.65:1 | AAA | Lc 91.9 | Preferred for body text |
| #313999 text on black | 2.17:1 | Fails | Lc -10.5 | 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 900.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6679FF
oklch(63.1% 0.198 273.3)
-
Step 600
600
#4F55FF
oklch(55.7% 0.246 273.5)
-
Step 700
700
#403FE4
oklch(49% 0.239 273.4)
-
Step 800
800
#3436B8
oklch(42.6% 0.198 273.5)
-
Step 900
900 (this color)
#313999
oklch(40% 0.155 273.5)
-
Step 950
950
#191F55
oklch(27.1% 0.097 273.2)
#313999 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) | #00499C | 0.048 |
| Deuteranopia (no green cones) | #004097 | 0.039 |
| Tritanopia (no blue cones) | #005163 | 0.127 |
| Achromatopsia (no color) | #454545 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313999
#313999
oklch(40% 0.155 273.5)
- #574600
#574600
oklch(40% 0.082 93)
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 #313999, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.035
- Blueberry #464196 ΔE 0.040
- Cobalt #1E488F ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.045
- Indigo Blue #3A18B1 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.068
- Dusk Blue #26538D ΔE 0.074
- Imperial Purple #480CA8 ΔE 0.075
Use #313999 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.