#2571AE
Closest named color: Flat Blue (#3C73A8). oklch(53.3% 0.12 247.2), rgb(37, 113, 174).
Aa
White text reads best on this color (5.18:1).
About this color
#2571AE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.120 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.021 away. White text reads best on it, at 5.18:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.05:1 |
| White text | 5.18:1 |
Values
| HEX | #2571AE |
| RGB | rgb(37, 113, 174) |
| HSL | hsl(207, 65%, 41%) |
| OKLCH | oklch(53.3% 0.12 247.2) |
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 #2571AE | 5.18:1 | AA | Lc -80.7 | Fine for body text |
| Black text on #2571AE | 4.05:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #2571AE text on white | 5.18:1 | AA | Lc 75.3 | Fine for body text |
| #2571AE text on black | 4.05:1 | AA large text | Lc -26.4 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADCEC
oklch(88.6% 0.029 244.9)
-
Step 300
300
#A5C5E2
oklch(81% 0.054 245.9)
-
Step 400
400
#74A6D4
oklch(70.8% 0.086 247.1)
-
Step 500
500
#4D8FC9
oklch(63.2% 0.111 247.1)
-
Step 600
600 (this color)
#2571AE
oklch(53.3% 0.12 247.2)
-
Step 700
700
#1F659C
oklch(49.2% 0.111 246.8)
-
Step 800
800
#1C527F
oklch(42.6% 0.094 247.5)
-
Step 900
900
#1E4466
oklch(37.6% 0.073 248)
-
Step 950
950
#12283C
oklch(26.9% 0.047 247.8)
#2571AE 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) | #5574B1 | 0.046 |
| Deuteranopia (no green cones) | #4167AD | 0.033 |
| Tritanopia (no blue cones) | #008087 | 0.087 |
| Achromatopsia (no color) | #6D6D6D | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2571AE
#2571AE
oklch(53.3% 0.12 247.2)
- #995D00
#995D00
oklch(53.3% 0.118 67.3)
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 #2571AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.021
- Mid Blue #276AB3 ΔE 0.023
- Nice Blue #107AB0 ΔE 0.025
- French Blue #436BAD ΔE 0.027
- Muted Blue #3B719F ΔE 0.028
- Ocean Blue #03719C ΔE 0.033
- Windows Blue #3778BF ΔE 0.035
- Dull Blue #49759C ΔE 0.044
Use #2571AE 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.