#315FCB
Closest named color: Warm Blue (#4B57DB). oklch(51.6% 0.176 263.9), rgb(49, 95, 203).
Aa
White text reads best on this color (5.78:1).
About this color
#315FCB is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.176 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.040 away. White text reads best on it, at 5.78:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.62:1 |
| White text | 5.78:1 |
Values
| HEX | #315FCB |
| RGB | rgb(49, 95, 203) |
| HSL | hsl(222, 61%, 49%) |
| OKLCH | oklch(51.6% 0.176 263.9) |
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 #315FCB | 5.78:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #315FCB | 3.62:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #315FCB text on white | 5.78:1 | AA | Lc 78.5 | Fine for body text |
| #315FCB text on black | 3.62:1 | AA large text | Lc -23.3 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A5C1F8
oklch(81% 0.084 263.6)
-
Step 400
400
#759EF5
oklch(70.7% 0.136 264.1)
-
Step 500
500
#5283F1
oklch(63.1% 0.173 264)
-
Step 600
600
#376AE0
oklch(55.7% 0.189 263.8)
-
Step 700
700 (this color)
#315FCB
oklch(51.6% 0.176 263.9)
-
Step 800
800
#24489D
oklch(42.7% 0.145 264)
-
Step 900
900
#213D7D
oklch(37.6% 0.114 264)
-
Step 950
950
#142449
oklch(26.9% 0.072 264.5)
#315FCB 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) | #096DCF | 0.037 |
| Deuteranopia (no green cones) | #005FC9 | 0.024 |
| Tritanopia (no blue cones) | #00798C | 0.137 |
| Achromatopsia (no color) | #656565 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #315FCB
#315FCB
oklch(51.6% 0.176 263.9)
- #856100
#856100
oklch(51.6% 0.106 83.1)
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 #315FCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.040
- Royal Blue #4169E1 ΔE 0.046
- Mid Blue #276AB3 ΔE 0.051
- Azul #1D5DEC ΔE 0.052
- Neon Blue #4361EE ΔE 0.058
- Iris #6258C4 ΔE 0.060
- Cerulean Blue #056EEE ΔE 0.063
- French Blue #436BAD ΔE 0.064
Use #315FCB 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.