#315FD1
Closest named color: Warm Blue (#4B57DB). oklch(52.1% 0.184 264.3), rgb(49, 95, 209).
Aa
White text reads best on this color (5.69:1).
About this color
#315FD1 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.184 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.035 away. White text reads best on it, at 5.69:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.184) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.68:1 |
| White text | 5.69:1 |
Values
| HEX | #315FD1 |
| RGB | rgb(49, 95, 209) |
| HSL | hsl(223, 63%, 51%) |
| OKLCH | oklch(52.1% 0.184 264.3) |
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 #315FD1 | 5.69:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #315FD1 | 3.68:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #315FD1 text on white | 5.69:1 | AA | Lc 78.0 | Fine for body text |
| #315FD1 text on black | 3.68:1 | AA large text | Lc -23.8 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C9D9FB
oklch(88.4% 0.05 265.4)
-
Step 300
300
#A4C0FB
oklch(80.8% 0.089 264.8)
-
Step 400
400
#739EF9
oklch(70.8% 0.142 264)
-
Step 500
500
#5082F6
oklch(63.1% 0.182 264.3)
-
Step 600
600
#3668E5
oklch(55.6% 0.198 264.4)
-
Step 700
700 (this color)
#315FD1
oklch(52.1% 0.184 264.3)
-
Step 800
800
#2347A1
oklch(42.8% 0.152 264.4)
-
Step 900
900
#203D7F
oklch(37.7% 0.117 263.8)
-
Step 950
950
#13244B
oklch(27% 0.076 264.2)
#315FD1 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) | #006ED5 | 0.039 |
| Deuteranopia (no green cones) | #0060CF | 0.024 |
| Tritanopia (no blue cones) | #007B8F | 0.143 |
| Achromatopsia (no color) | #676767 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #315FD1
#315FD1
oklch(52.1% 0.184 264.3)
- #866300
#866300
oklch(52.1% 0.107 84.3)
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 #315FD1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.035
- Royal Blue #4169E1 ΔE 0.040
- Azul #1D5DEC ΔE 0.043
- Neon Blue #4361EE ΔE 0.049
- Cerulean Blue #056EEE ΔE 0.056
- Mid Blue #276AB3 ΔE 0.058
- Iris #6258C4 ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.064
Use #315FD1 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.