#313FAA
Closest named color: Sapphire (#2138AB). oklch(42.7% 0.17 271.4), rgb(49, 63, 170).
Aa
White text reads best on this color (8.67:1).
About this color
#313FAA is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.170 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.026 away. White text reads best on it, at 8.67:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.42:1 |
| White text | 8.67:1 |
Values
| HEX | #313FAA |
| RGB | rgb(49, 63, 170) |
| HSL | hsl(233, 55%, 43%) |
| OKLCH | oklch(42.7% 0.17 271.4) |
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 #313FAA | 8.67:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #313FAA | 2.42:1 | Fails | Lc 14.8 | Not readable |
| #313FAA text on white | 8.67:1 | AAA | Lc 89.2 | Fine for body text |
| #313FAA text on black | 2.42:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#AABEFF
oklch(81% 0.095 271)
-
Step 400
400
#7F99FF
oklch(70.8% 0.152 271.3)
-
Step 500
500
#617AFF
oklch(63% 0.198 271.6)
-
Step 600
600
#4A5DF2
oklch(55.6% 0.222 271.5)
-
Step 700
700
#3C4BD3
oklch(49.1% 0.207 271.4)
-
Step 800
800 (this color)
#313FAA
oklch(42.7% 0.17 271.4)
-
Step 900
900
#2A3787
oklch(37.7% 0.134 271.4)
-
Step 950
950
#18214F
oklch(26.9% 0.085 271.3)
#313FAA 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) | #0051AD | 0.048 |
| Deuteranopia (no green cones) | #0046A8 | 0.035 |
| Tritanopia (no blue cones) | #005A6E | 0.136 |
| Achromatopsia (no color) | #4B4B4B | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313FAA
#313FAA
oklch(42.7% 0.17 271.4)
- #604C00
#604C00
oklch(42.5% 0.087 91.4)
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 #313FAA, closest first.
No curated palette has a color within ΔE 0.04 of #313FAA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.026
- Blueberry #464196 ΔE 0.045
- Blue Blue #2242C7 ΔE 0.049
- Majorelle Blue #3F37C9 ΔE 0.054
- Cobalt #1E488F ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.060
- Indigo Blue #3A18B1 ΔE 0.065
- Blue With A Hint Of Purple #533CC6 ΔE 0.066
Use #313FAA 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.