#1645B1
Closest named color: Sapphire (#2138AB). oklch(43.4% 0.179 263.2), rgb(22, 69, 177).
Aa
White text reads best on this color (8.33:1).
About this color
#1645B1 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.179 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.031 away. White text reads best on it, at 8.33:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.52:1 |
| White text | 8.33:1 |
Values
| HEX | #1645B1 |
| RGB | rgb(22, 69, 177) |
| HSL | hsl(222, 78%, 39%) |
| OKLCH | oklch(43.4% 0.179 263.2) |
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 #1645B1 | 8.33:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #1645B1 | 2.52:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #1645B1 text on white | 8.33:1 | AAA | Lc 88.0 | Fine for body text |
| #1645B1 text on black | 2.52:1 | Fails | Lc -14.2 | Not readable |
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 800.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6D9DFF
oklch(70.6% 0.153 263.3)
-
Step 500
500
#4681FF
oklch(63.1% 0.198 263.1)
-
Step 600
600
#2263F8
oklch(55.6% 0.232 263.1)
-
Step 700
700
#1650D8
oklch(49% 0.216 263.2)
-
Step 800
800 (this color)
#1645B1
oklch(43.4% 0.179 263.2)
-
Step 900
900
#173A8A
oklch(37.6% 0.14 263.4)
-
Step 950
950
#0E2351
oklch(27% 0.089 263.2)
#1645B1 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) | #0055B5 | 0.039 |
| Deuteranopia (no green cones) | #0047AF | 0.010 |
| Tritanopia (no blue cones) | #006174 | 0.137 |
| Achromatopsia (no color) | #4E4E4E | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1645B1
#1645B1
oklch(43.4% 0.179 263.2)
- #684B00
#684B00
oklch(43.3% 0.089 83)
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 #1645B1, closest first.
No curated palette has a color within ΔE 0.04 of #1645B1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.031
- Blue Blue #2242C7 ΔE 0.037
- Cobalt #1E488F ΔE 0.056
- Majorelle Blue #3F37C9 ΔE 0.059
- Blueberry #464196 ΔE 0.067
- Dusk Blue #26538D ΔE 0.074
- Blue With A Hint Of Purple #533CC6 ΔE 0.079
- Indigo Blue #3A18B1 ΔE 0.081
Use #1645B1 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.