#297DD3
Closest named color: Windows Blue (#3778BF). oklch(58.4% 0.154 252.7), rgb(41, 125, 211).
Aa
Black text reads best on this color (4.96:1).
About this color
#297DD3 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.154 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.031 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #297DD3 |
| RGB | rgb(41, 125, 211) |
| HSL | hsl(210, 67%, 49%) |
| OKLCH | oklch(58.4% 0.154 252.7) |
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 #297DD3 | 4.22:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #297DD3 | 4.96:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #297DD3 text on white | 4.22:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #297DD3 text on black | 4.96:1 | AA | Lc -32.9 | Non-text elements, placeholder text |
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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A1C4ED
oklch(80.9% 0.069 252.7)
-
Step 400
400
#6DA4E4
oklch(70.7% 0.111 253)
-
Step 500
500
#438CDC
oklch(63.1% 0.141 252.8)
-
Step 600
600 (this color)
#297DD3
oklch(58.4% 0.154 252.7)
-
Step 700
700
#0E61AE
oklch(49% 0.143 252.7)
-
Step 800
800
#11508D
oklch(42.8% 0.118 252.4)
-
Step 900
900
#174371
oklch(37.8% 0.092 252.4)
-
Step 950
950
#0F2742
oklch(26.9% 0.059 253.1)
#297DD3 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) | #5383D6 | 0.040 |
| Deuteranopia (no green cones) | #3574D1 | 0.024 |
| Tritanopia (no blue cones) | #00929E | 0.115 |
| Achromatopsia (no color) | #7B7B7B | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #297DD3
#297DD3
oklch(58.4% 0.154 252.7)
- #A86E00
#A86E00
oklch(58.5% 0.125 72.9)
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 #297DD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.031
- Water Blue #0E87CC ΔE 0.032
- Cool Blue #4984B8 ΔE 0.055
- Steel Blue #4682B4 ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.057
- Nice Blue #107AB0 ΔE 0.057
- Royal Blue #4169E1 ΔE 0.059
- Cerulean Blue #056EEE ΔE 0.062
Use #297DD3 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.