#2973B1
Closest named color: Flat Blue (#3C73A8). oklch(54% 0.121 247.8), rgb(41, 115, 177).
Aa
White text reads best on this color (5.02:1).
About this color
#2973B1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.121 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.019 away. White text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.18:1 |
| White text | 5.02:1 |
Values
| HEX | #2973B1 |
| RGB | rgb(41, 115, 177) |
| HSL | hsl(207, 62%, 43%) |
| OKLCH | oklch(54% 0.121 247.8) |
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 #2973B1 | 5.02:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #2973B1 | 4.18:1 | AA large text | Lc 29.7 | Dividers and decoration only |
| #2973B1 text on white | 5.02:1 | AA | Lc 74.4 | Content text, not long reading |
| #2973B1 text on black | 4.18:1 | AA large text | Lc -27.3 | 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 600.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADBED
oklch(88.4% 0.031 249.7)
-
Step 300
300
#A5C4E3
oklch(80.8% 0.055 248.5)
-
Step 400
400
#74A6D5
oklch(70.8% 0.087 247.6)
-
Step 500
500
#4E8FC9
oklch(63.2% 0.11 247.4)
-
Step 600
600 (this color)
#2973B1
oklch(54% 0.121 247.8)
-
Step 700
700
#20649D
oklch(49% 0.113 248.2)
-
Step 800
800
#1D527F
oklch(42.7% 0.093 247.8)
-
Step 900
900
#1E4466
oklch(37.6% 0.073 248)
-
Step 950
950
#13283C
oklch(27% 0.046 248.8)
#2973B1 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) | #5676B4 | 0.044 |
| Deuteranopia (no green cones) | #4369B0 | 0.032 |
| Tritanopia (no blue cones) | #00828A | 0.087 |
| Achromatopsia (no color) | #6F6F6F | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2973B1
#2973B1
oklch(54% 0.121 247.8)
- #9B5F00
#9B5F00
oklch(54% 0.119 67.8)
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 #2973B1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.019
- Nice Blue #107AB0 ΔE 0.022
- Mid Blue #276AB3 ΔE 0.027
- French Blue #436BAD ΔE 0.028
- Windows Blue #3778BF ΔE 0.028
- Muted Blue #3B719F ΔE 0.029
- Ocean Blue #03719C ΔE 0.038
- Dull Blue #49759C ΔE 0.043
Use #2973B1 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.