#3557D8
Closest named color: Warm Blue (#4B57DB). oklch(51.3% 0.201 267.4), rgb(53, 87, 216).
Aa
White text reads best on this color (5.98:1).
About this color
#3557D8 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.201 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.025 away. White text reads best on it, at 5.98:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.201) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.50:1 |
| White text | 5.98:1 |
Values
| HEX | #3557D8 |
| RGB | rgb(53, 87, 216) |
| HSL | hsl(227, 68%, 53%) |
| OKLCH | oklch(51.3% 0.201 267.4) |
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 #3557D8 | 5.98:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #3557D8 | 3.50:1 | AA large text | Lc 24.7 | Dividers and decoration only |
| #3557D8 text on white | 5.98:1 | AA | Lc 79.3 | Fine for body text |
| #3557D8 text on black | 3.50:1 | AA large text | Lc -22.5 | 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 700.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FE
oklch(88.5% 0.054 266.8)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#779BFF
oklch(70.7% 0.152 267.5)
-
Step 500
500
#557EFF
oklch(63.2% 0.197 267.3)
-
Step 600
600
#3C62EF
oklch(55.5% 0.216 267.3)
-
Step 700
700 (this color)
#3557D8
oklch(51.3% 0.201 267.4)
-
Step 800
800
#2742A8
oklch(42.6% 0.167 267.3)
-
Step 900
900
#233A85
oklch(37.7% 0.129 267.1)
-
Step 950
950
#15234E
oklch(27.1% 0.081 267.2)
#3557D8 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) | #006BDC | 0.049 |
| Deuteranopia (no green cones) | #005CD6 | 0.028 |
| Tritanopia (no blue cones) | #00788F | 0.159 |
| Achromatopsia (no color) | #636363 | 0.202 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3557D8
#3557D8
oklch(51.3% 0.201 267.4)
- #806200
#806200
oklch(51.2% 0.105 87.6)
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 #3557D8, closest first.
No curated palette has a color within ΔE 0.04 of #3557D8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.025
- Azul #1D5DEC ΔE 0.035
- Neon Blue #4361EE ΔE 0.045
- Royal Blue #4169E1 ΔE 0.049
- Blue Blue #2242C7 ΔE 0.061
- Cerulean Blue #056EEE ΔE 0.062
- Bright Blue #0165FC ΔE 0.064
- Iris #6258C4 ΔE 0.065
Use #3557D8 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.