#3657B7
Closest named color: Mid Blue (#276AB3). oklch(48.7% 0.157 266.3), rgb(54, 87, 183).
Aa
White text reads best on this color (6.55:1).
About this color
#3657B7 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.157 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.052 away. White text reads best on it, at 6.55:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.20:1 |
| White text | 6.55:1 |
Values
| HEX | #3657B7 |
| RGB | rgb(54, 87, 183) |
| HSL | hsl(225, 54%, 46%) |
| OKLCH | oklch(48.7% 0.157 266.3) |
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 #3657B7 | 6.55:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #3657B7 | 3.20:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #3657B7 text on white | 6.55:1 | AA | Lc 82.1 | Fine for body text |
| #3657B7 text on black | 3.20:1 | AA large text | Lc -19.8 | 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#AAC0F3
oklch(80.9% 0.076 266.5)
-
Step 400
400
#7D9EEC
oklch(70.7% 0.121 265.9)
-
Step 500
500
#5E83E7
oklch(63.1% 0.156 266.7)
-
Step 600
600
#456BD5
oklch(55.7% 0.169 266.2)
-
Step 700
700 (this color)
#3657B7
oklch(48.7% 0.157 266.3)
-
Step 800
800
#2E4995
oklch(42.8% 0.129 266.3)
-
Step 900
900
#283E77
oklch(37.8% 0.101 265.9)
-
Step 950
950
#182446
oklch(26.9% 0.065 267.3)
#3657B7 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) | #1864BA | 0.036 |
| Deuteranopia (no green cones) | #0058B5 | 0.032 |
| Tritanopia (no blue cones) | #006E7E | 0.127 |
| Achromatopsia (no color) | #5D5D5D | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3657B7
#3657B7
oklch(48.7% 0.157 266.3)
- #785B00
#785B00
oklch(48.8% 0.1 86.9)
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 #3657B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.052
- Warm Blue #4B57DB ΔE 0.062
- Blue Blue #2242C7 ΔE 0.062
- Denim Blue #3B5B92 ΔE 0.062
- Iris #6258C4 ΔE 0.063
- French Blue #436BAD ΔE 0.063
- Dusky Blue #475F94 ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.071
Use #3657B7 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.