#3D70B7
Closest named color: French Blue (#436BAD). oklch(54.4% 0.124 257.1), rgb(61, 112, 183).
Aa
White text reads best on this color (5.00:1).
About this color
#3D70B7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.124 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.019 away. White text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #3D70B7 |
| RGB | rgb(61, 112, 183) |
| HSL | hsl(215, 50%, 48%) |
| OKLCH | oklch(54.4% 0.124 257.1) |
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 #3D70B7 | 5.00:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #3D70B7 | 4.19:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #3D70B7 text on white | 5.00:1 | AA | Lc 74.3 | Content text, not long reading |
| #3D70B7 text on black | 4.19:1 | AA large text | Lc -27.4 | 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 600.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CCDAEE
oklch(88.4% 0.031 257.2)
-
Step 300
300
#AAC3E5
oklch(81% 0.055 256.1)
-
Step 400
400
#7DA3D8
oklch(70.8% 0.089 256.8)
-
Step 500
500
#5B8BCE
oklch(63.2% 0.114 256.9)
-
Step 600
600 (this color)
#3D70B7
oklch(54.4% 0.124 257.1)
-
Step 700
700
#3261A1
oklch(49.2% 0.115 256.7)
-
Step 800
800
#2A4F82
oklch(42.6% 0.095 256.9)
-
Step 900
900
#274269
oklch(37.7% 0.075 257.6)
-
Step 950
950
#17273D
oklch(27% 0.047 256.6)
#3D70B7 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) | #5076BA | 0.028 |
| Deuteranopia (no green cones) | #3E6AB6 | 0.016 |
| Tritanopia (no blue cones) | #00808A | 0.101 |
| Achromatopsia (no color) | #6F6F6F | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D70B7
#3D70B7
oklch(54.4% 0.124 257.1)
- #946600
#946600
oklch(54.5% 0.114 77.8)
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 #3D70B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.019
- Windows Blue #3778BF ΔE 0.023
- Flat Blue #3C73A8 ΔE 0.027
- Mid Blue #276AB3 ΔE 0.027
- Nice Blue #107AB0 ΔE 0.039
- Muted Blue #3B719F ΔE 0.039
- Dull Blue #49759C ΔE 0.050
- Steel Blue #4682B4 ΔE 0.055
Use #3D70B7 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.