#3657BB
Closest named color: Mid Blue (#276AB3). oklch(49% 0.162 266.6), rgb(54, 87, 187).
Aa
White text reads best on this color (6.48:1).
About this color
#3657BB is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.162 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.054 away. White text reads best on it, at 6.48:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.23:1 |
| White text | 6.48:1 |
Values
| HEX | #3657BB |
| RGB | rgb(54, 87, 187) |
| HSL | hsl(225, 55%, 47%) |
| OKLCH | oklch(49% 0.162 266.6) |
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 #3657BB | 6.48:1 | AA | Lc -86.9 | Fine for body text |
| Black text on #3657BB | 3.23:1 | AA large text | Lc 22.3 | Dividers and decoration only |
| #3657BB text on white | 6.48:1 | AA | Lc 81.8 | Fine for body text |
| #3657BB text on black | 3.23:1 | AA large text | Lc -20.1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#A9C0F4
oklch(80.9% 0.078 266.1)
-
Step 400
400
#7D9DEF
oklch(70.6% 0.126 267)
-
Step 500
500
#5D83EA
oklch(63.2% 0.16 266.6)
-
Step 600
600
#446AD8
oklch(55.7% 0.174 266.4)
-
Step 700
700 (this color)
#3657BB
oklch(49% 0.162 266.6)
-
Step 800
800
#2D4898
oklch(42.7% 0.135 266.6)
-
Step 900
900
#283D79
oklch(37.7% 0.105 266.8)
-
Step 950
950
#172447
oklch(26.9% 0.068 266.6)
#3657BB 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) | #0D64BF | 0.038 |
| Deuteranopia (no green cones) | #0058B9 | 0.031 |
| Tritanopia (no blue cones) | #006F80 | 0.131 |
| Achromatopsia (no color) | #5E5E5E | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3657BB
#3657BB
oklch(49% 0.162 266.6)
- #795C00
#795C00
oklch(49.1% 0.1 87.1)
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 #3657BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.054
- Warm Blue #4B57DB ΔE 0.056
- Blue Blue #2242C7 ΔE 0.060
- Iris #6258C4 ΔE 0.060
- French Blue #436BAD ΔE 0.065
- Blue With A Hint Of Purple #533CC6 ΔE 0.068
- Denim Blue #3B5B92 ΔE 0.068
- Majorelle Blue #3F37C9 ΔE 0.072
Use #3657BB 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.