Ultramarine Blue #1805DB

About this color

#1805DB is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.274 and its hue 267°. Its hue sits on the cool side of the wheel. It is the named color Ultramarine Blue. White text reads best on it, at 10.07:1.

Colors that go with Ultramarine Blue

Matches found by rotating Ultramarine Blue around the OKLCH hue wheel, each labelled with the closest name in our list.

Color palettes with Ultramarine Blue

Curated color palettes that contain a color within ΔE 0.06 (OKLab) of Ultramarine Blue, closest first.

No curated palette has a color within ΔE 0.06 of Ultramarine Blue yet.

Similar named colors

The eight named colors closest to Ultramarine Blue, with their ΔE distance.

• Pure Blue #0203E2 ΔE 0.017
• True Blue #010FCC ΔE 0.028
• Medium Blue #0000CD ΔE 0.031
• Strong Blue #0C06F7 ΔE 0.046
• Primary Blue #0804F9 ΔE 0.049
• Rich Blue #021BF9 ΔE 0.054
• Blue #0000FF ΔE 0.059
• Ultramarine #2000B1 ΔE 0.072

More about Ultramarine Blue

• Shades of blue
• What blue means

How to make Ultramarine Blue

A starting recipe from common paint colors, found with a spectral paint model (the color mixer’s paint mode). Real pigments vary, so mix a small test batch and adjust.

• 1 part blue

Recipe result: #1F4FB3, a difference of ΔE 0.118 from Ultramarine Blue. Ultramarine Blue is more vivid than these paints can mix, so start from a ready-made blue paint and adjust it.

What colors make blue? | Color mixing chart

Codes for Ultramarine Blue in every format

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.

Shades and tints of Ultramarine Blue

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.

1. Step 50

   50

   #F1F5FF

   oklch(97% 0.014 268.5)

2. Step 100

   100

   #E1EAFF

   oklch(93.7% 0.03 267.2)

3. Step 200

   200

   #C8D9FF

   oklch(88.5% 0.056 266.2)

4. Step 300

   300

   #A5BFFF

   oklch(80.9% 0.095 267.2)

5. Step 400

   400

   #759BFF

   oklch(70.6% 0.153 266.8)

6. Step 500

   500

   #537EFF

   oklch(63.1% 0.197 266.8)

7. Step 600

   600

   #345CFF

   oklch(55.5% 0.245 266.9)

8. Step 700

   700

   #2133FF

   oklch(49.1% 0.287 266.8)

9. Step 800

   800 (this color)

   #1805DB

   oklch(41% 0.274 266.8)

10. Step 900

    900

    #1424B0

    oklch(37.7% 0.214 266.8)

11. Step 950

    950

    #0A1967

    oklch(27% 0.136 266.8)

Export this scale for Tailwind in the Tailwind colors tool

Ultramarine Blue 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.