#3975A7
Closest named color: Flat Blue (#3C73A8). oklch(54.5% 0.1 246.2), rgb(57, 117, 167).
Aa
White text reads best on this color (4.91:1).
About this color
#3975A7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.100 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.007 away. White text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.27:1 |
| White text | 4.91:1 |
Values
| HEX | #3975A7 |
| RGB | rgb(57, 117, 167) |
| HSL | hsl(207, 49%, 44%) |
| OKLCH | oklch(54.5% 0.1 246.2) |
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 #3975A7 | 4.91:1 | AA | Lc -79.2 | Fine for body text |
| Black text on #3975A7 | 4.27:1 | AA large text | Lc 30.3 | Non-text elements, placeholder text |
| #3975A7 text on white | 4.91:1 | AA | Lc 73.8 | Content text, not long reading |
| #3975A7 text on black | 4.27:1 | AA large text | Lc -27.9 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDBE9
oklch(88.4% 0.025 246.2)
-
Step 300
300
#AAC4DD
oklch(80.9% 0.045 247.3)
-
Step 400
400
#7BA5CB
oklch(70.6% 0.072 246.3)
-
Step 500
500
#588FBE
oklch(63.1% 0.092 245.7)
-
Step 600
600 (this color)
#3975A7
oklch(54.5% 0.1 246.2)
-
Step 700
700
#2E6592
oklch(49.1% 0.093 246)
-
Step 800
800
#275277
oklch(42.6% 0.078 246.9)
-
Step 900
900
#254460
oklch(37.6% 0.061 247.4)
-
Step 950
950
#162838
oklch(26.9% 0.038 246.6)
#3975A7 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) | #5F77A9 | 0.042 |
| Deuteranopia (no green cones) | #506CA6 | 0.032 |
| Tritanopia (no blue cones) | #008187 | 0.075 |
| Achromatopsia (no color) | #717171 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3975A7
#3975A7
oklch(54.5% 0.1 246.2)
- #976327
#976327
oklch(54.5% 0.1 66.4)
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 #3975A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.007
- Muted Blue #3B719F ΔE 0.015
- Dull Blue #49759C ΔE 0.022
- Nice Blue #107AB0 ΔE 0.025
- Cerulean #457B9D ΔE 0.029
- French Blue #436BAD ΔE 0.033
- Ocean Blue #03719C ΔE 0.036
- Stormy Blue #507B9C ΔE 0.037
Use #3975A7 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.