Cladogram Maker
Name the organisms — or paste a character table — and the AI works out the nested clades and draws a clean, correctly branching tree. No alignment files, no desktop software.
Cladogram examples
Five ways to draw an evolutionary tree, each shown with a real render — click a card to apply the style, or zoom for the full image.
What is a cladogram?
A cladogram is a branching diagram of how a group of organisms is related by descent. Each tip is a taxon, each branch point (node) is the most recent common ancestor of everything above it, and any node plus all its descendants is a clade. Branches are usually marked with the derived characters — synapomorphies — that first appear there, which is what makes the tree an argument rather than a picture: the nesting of shared characters is the evidence for the nesting of the groups.
A cladogram shows branching order only. Its branch lengths mean nothing, which is what separates it from a phylogram, where length is proportional to genetic change, and from a chronogram, where length is time. This cladogram maker produces the figure — describe the group in plain words, or paste the character table, and the AI resolves the topology and draws it ready for a worksheet, a lecture slide, a thesis or a paper.
Key facts
- A cladogram states branching order only — its branch lengths carry no meaning, so a long branch does not mean more change or more time.
- A clade is any node plus every descendant of that node; naming a clade means pointing at a node, not at a region of the drawing.
- Branches are marked with synapomorphies — derived characters that first appear at that node and are shared by everything above it.
- An outgroup is what tells the tree which end is the root; without one, the same branching pattern has no direction.
- Rotating the branches at any node produces a different-looking drawing of exactly the same tree.
How does the cladogram maker work?
Describe the group
Name the organisms, paste a character matrix, give a Newick string, or just name the group — "the great apes". The AI works out the nested clades, using the accepted phylogeny when you have not specified one.
Pick a tree style
The classic teaching ladder with a trait marked at every branch point, a clean rectangular tree for publication, the tree paired with the character matrix it came from, illustrated tips, or a whiteboard sketch.
Refine in the workspace
The cladogram opens in your workspace where you can edit regions, adjust labels, upscale and export in high resolution for handouts, slides, posters or papers.
The parts of a cladogram
Cladograms are readable across textbooks and journals because every one is built from the same handful of parts. These are the terms you will meet reading them — and the ones the generator can label for you:
Root
The base of the tree — the common ancestor of everything shown.
Node
A branch point: the last common ancestor of the lineages leaving it.
Branch
A lineage between two nodes. Its length carries no meaning.
Tip (taxon)
A terminal group — a species, genus or larger group being compared.
Clade
A node with every descendant it has, and nothing else.
Outgroup
The taxon outside the group of interest; it roots the tree.
Synapomorphy
A derived trait marked where it first appears, shared from there on.
Polytomy
Three or more lineages from one node — the order is unresolved.
One tree can be drawn many ways. A cladogram may be rectangular, slanted, or laid out as a ladder, and the branches at any node can be rotated freely — none of that changes the relationships it states. Two diagrams that look nothing alike can be the same tree.
How to read a cladogram without misreading it
Almost every mistake with these diagrams comes from reading something into the drawing that the tree does not say. Three worth naming:
The right-hand taxon is not the most evolved
Position along the tips is a drawing convention, not a ranking. Every living tip has had exactly the same amount of time since the root — a moss is as modern as a sunflower. Rotate the branches at any node and the tree is unchanged.
Closeness is measured through nodes, not across the page
Two tips printed side by side can be distant relatives. What matters is where their lineages meet: the taxa sharing the most recent common ancestor are the closest, however far apart they sit.
Tips are not ancestors of other tips
A cladogram never says that one living group descended from another. Ancestors sit at the nodes, and those ancestors are hypothetical — inferred from the characters, not one of the organisms drawn at the tips.
Where are cladograms used?
Worksheets, revision notes and lab reports
Worksheets, revision notes and lab reports for evolution units — build the tree from a character table and get the matrix and the diagram in one figure, or a whiteboard version for the lesson itself.
Lectures & science communication
The illustrated style puts an organism at every tip, which is what a slide or an explainer needs — the kind of figure phylogenetics software will not draw and an illustrator has to be commissioned for.
Papers, theses & posters
Clean rectangular trees with exact taxon names and clade labels for a background section, a review or a poster panel, without opening tree-drawing software or preparing a data file.
Cladogram vs phylogenetic tree
A cladogram is one kind of phylogenetic tree — the kind that shows branching order and nothing else. In a phylogram, branch length is proportional to the amount of genetic change; in a chronogram, branch length is time. All three state the same relationships, but only the cladogram makes no claim about how much or how long. Asking whether a diagram is "a cladogram or a phylogenetic tree" is really asking whether its branch lengths mean anything.
| Cladogram | Phylogram | Chronogram | |
|---|---|---|---|
| Branch length means | Nothing | Amount of genetic change | Elapsed time |
| Tips line up | Yes, flush at the right | No — they end where their change does | Yes, at the present |
| Has a time axis | No | No | Yes, in years or millions of years |
| Built from | Shared derived characters | Sequence data plus a model | Sequences plus fossil calibrations |
| States branching order | Yes | Yes | Yes |
| Answers "how different?" | No | Yes | No |
| Answers "how long ago?" | No | No | Yes |
A cladogram is never "less accurate" than a phylogram — it makes fewer claims. If your data support branching order but not rates, a cladogram is the honest diagram to draw.
Common questions about cladograms
How does the AI cladogram generator work?
You describe the group in plain language. The AI first works out the nested clades — which taxa form each group, and what derived character marks each node — then draws the tree with your exact taxon names at the tips. Give it just a group name and it uses the currently accepted phylogeny; give it a character matrix and it builds the tree that data implies.
Can I build a cladogram from a character table?
Yes, and it is one of the things this does best. Paste the table and pick the Tree + character matrix style: the taxon with the fewest derived characters becomes the outgroup, each character labels the node where it first appears, and the finished figure shows the tree beside the matrix it came from — the exact figure a classroom exercise asks for.
Can it read Newick, or a tree I have already worked out?
Yes. Paste a Newick string or simply write the topology out, and the tree is drawn exactly as specified rather than corrected to the textbook version. If what you asked for conflicts with the accepted phylogeny, the diagram follows your instruction and the note in your workspace says so.
Is this a phylogenetics package? Can I load an alignment or get bootstrap values?
No — this makes tree *figures* for teaching, publications, slides and articles, not phylogenetic inference. If you need to estimate a tree from sequence data with support values, use MEGA, RAxML, IQ-TREE or iTOL; if you need a clean, correct-looking cladogram in about a minute, this is the faster path.
What is the difference between a cladogram and a phylogenetic tree?
Every cladogram is a phylogenetic tree, but it shows branching order alone — its branch lengths are arbitrary. A phylogram scales branch length to the amount of evolutionary change and a chronogram scales it to time. Cladograms are what teaching material and most conceptual figures use, because the relationships are the point.
Is the cladogram maker free? Can I use the diagrams commercially?
You can generate cladograms on the free plan (with a watermark on exports). Paid plans remove the watermark and unlock every model and high-resolution export, and you can use your diagrams in courses, publications and commercial material.
How do you read a cladogram?
Read it at the nodes, not across the page. Two tips are close relatives if the node joining them is near the tips, and distant relatives if you have to travel down to the root to connect them — regardless of how near each other they are printed. Tips are not ranked left to right, and no living tip is more evolved than another: every one has had the same time since the root.
What is a clade?
A clade is one node on the tree plus every descendant of that node, with nothing left out. Birds and crocodiles plus their common ancestor form a clade; "reptiles" as usually meant does not, because it excludes birds while including their ancestor. A group that leaves out some descendants is paraphyletic, and a group assembled from unrelated branches is polyphyletic — neither is a clade.
What is an outgroup and why does a cladogram need one?
The outgroup is a taxon known to lie outside the group you are studying — it is what tells you which character states are ancestral and therefore where the root goes. Without an outgroup a branching pattern has no direction: the same tree could be rooted in several places and would then say quite different things about who is related to whom.
What does a node on a cladogram mean?
A node is the most recent common ancestor of everything above it. It is a hypothesis, not a fossil: it stands for an ancestral population that the character evidence implies existed, and it usually has no name and no specimen attached to it.
What is a synapomorphy?
A synapomorphy is a derived character shared by all members of a clade because it first appeared in their common ancestor — feathers for birds, or a four-chambered heart for birds and crocodiles together. Synapomorphies are the evidence for the grouping; characters that are simply ancestral, or that evolved separately, are not.
How do I make a cladogram from scratch?
Start with a character table: taxa down the side, characters across the top, with the outgroup included. The taxon sharing fewest derived characters with the rest branches off first, and each further derived character marks the next node. Paste that table here and the tree is built from it directly — or describe the group in words and the currently accepted phylogeny is used instead.
Can two cladograms that look different show the same relationships?
Yes, and this is the most common way of misreading them. The branches at any node can be rotated freely, and the same tree may be drawn rectangular, slanted or as a ladder. Two diagrams that look nothing alike can be identical trees — only the nesting of the nodes carries information.
Sources
Keep exploring
Our other diagram tools, and the guides behind them.
Draw your first cladogram
From a list of organisms to a publication-ready tree in about a minute.
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