Color Stack Viewer
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The color stack viewer accumulates colors into a single strip as you add them, so you can stack colors and inspect the collection side-by-side before committing it anywhere.
What is Color Stack Viewer?
Colors rarely arrive one at a time. They trickle in — one from a logo, one from a screenshot, one from a stakeholder's message — and the working question is always what do these look like together. The color stack viewer is built around exactly that: a field to add colors one by one, and a live strip where the whole collection sits side-by-side, so the set grows in front of you and the relationships are visible from the second color onward.
Each entry in the stack shows its swatch and its hex, and the strip itself is the inspection surface:
- Every entry can be removed with one click when it turns out not to belong.
- Contrast between neighbours, accidental near-duplicates and whether the collection leans warm or cool all become obvious once the colors share a row.
- The copy-all button serialises the whole stack into one comma-separated list, ready to paste into a stylesheet comment, a ticket or another tool.
As a place to stack colors and inspect them, it sits deliberately between a single picker and a full palette tool. There is no shuffling, no harmony maths, no export formats; it is the collection tray that the fancier tools assume you already have. That makes it the honest first stop for the assemble phase of any palette work — get the candidates together, look at them side-by-side, delete the one that ruins the set — and the exporters or the palette sorters take over when the set is settled enough to deserve structure.
The tray's real value shows up mid-task. Scraping a palette out of a photograph means holding seven or eight candidates long enough to judge them together, and stacking them as they are sampled makes that judgement possible while the tab holding the source is still open, rather than at the end when the source is gone and the memory of the image has faded. Adding is one click or one keypress, removing the muddy ones is the same, and the order can be reshuffled to test which arrangement tells the story best.
That is the workflow the tool is built for: stack colors to inspect candidates in the order they were found, collect colors in one place so no promising sample is lost to a stray refresh, and build color list while browsing instead of reconstructing the set from a finished design days later. Duplicates become obvious once they are adjacent, and suspiciously close values become worth a second look before any of them is promoted into the deliverables.
The stack lives for the session, which matches the job:
- Reloading the page clears the list, so anything worth keeping has to be copied out first.
- There is no shuffling, no harmony maths and no export format here — structure arrives from the sorters and the exporters once the set is settled.
- Duplicates are shown rather than blocked, which is right for a collection tray but means the list can quietly gather near-identical values that deserve a second look.
How to use Color Stack Viewer
- Set a color in the field and press add — it joins the stack.
- Keep adding; inspect the strip for relationships, duplicates and clashes.
- Remove entries that do not belong, then copy all as a single list.
When to use Color Stack Viewer vs related tools
Use this while a set of colors is still being gathered and the question is how they sit together. Use the palette sorters once the set needs order, the exporters when it moves into code, and the multi-color picker when you are sampling from one image rather than collecting from anywhere. Once a set needs order the palette sorters arrange it, the CSS exporter and JSON exporter format it for code, and the palette importer is the way back in.
Privacy & Security
This tool runs entirely in your browser — no data ever leaves your device. There is no server round-trip, no upload, no logging, and no account required. Your input is processed locally using client-side JavaScript and is never stored, transmitted, or accessible to anyone else. When you close the tab, everything disappears.