Vizcept vs ConceptViz

ConceptViz (conceptviz.app) is an AI agent for diagrams, illustrations and charts, with 320 tool pages across science, teaching and research. Vizcept is an AI figure generator that typesets sentence diagrams, syntax trees, conceptual frameworks and CONSORT diagrams by code.

Vizcept's cheapest plan is $14.90 a month for 300 credits; ConceptViz's is $29.90 a month for 45 image credits. Both sell one-time credit packs.

A Vizcept code-typeset figure uses 2 credits when you are signed in; an image-model figure uses 5 credits at 2K or 8 at 4K. On ConceptViz a 2K image uses 1 image credit.

Vizcept is our product. Every ConceptViz figure here was read from its pricing page and tool pages on 18 October 2026; prices change, so check before you buy.

Each point was checked against ConceptViz's own tool pages on 18 October 2026. If that changes, we will update this list.

1/ Turn 20 sentences into a diagram worksheet and answer key

Paste up to 20 sentences and get two PDFs: a worksheet with the empty Reed–Kellogg lines for each sentence and a matching answer key, page for page (sample and free sets). ConceptViz's sentence diagram generator takes one sentence at a time; its separate AI worksheet generator makes text worksheets with answer keys, not diagram lines.

2/ Draw syntax trees by code, with editable SVG and LaTeX

The syntax tree generator typesets X-bar and minimalist trees with traces and movement arrows, so node labels are spelled exactly; paid plans download editable SVG or copy the labeled bracket string and LaTeX forest code. ConceptViz's syntax tree generator is an AI image tool that exports an image.

3/ Typeset conceptual frameworks with hypothesis labels

The conceptual framework generator reads your variables and hypotheses, then code places the boxes, arrows, moderators and H1–Hn labels, so construct names stay exactly as you wrote them. ConceptViz's conceptual framework page offers no exact or SVG mode; the AI lays out the figure.

4/ Read a CONSORT 2025 diagram from your paragraph

Paste the participant-flow paragraph from your manuscript and the CONSORT generator fills the CONSORT 2025 template (or the 2010 wording), two to five arms, with counts copied only from your text. ConceptViz's free Precise CONSORT mode draws the 2010 template from counts you type into a form.

We also publish how often our sentence diagrams match the textbook: on 50 sentences from Reed and Kellogg's own book, 20 matched line for line, 13 differed only in a modern convention, and 17 had a word or phrase on the wrong line (full test).

We typed the same 10 sentences into both tools on 18 October 2026, once each, with no notes, and changed nothing in the output. Five are the sample sentences ConceptViz offers on its own page, two match ConceptViz's example images, and three cover skills teachers ask about (indirect objects, gerunds, noun clauses). ConceptViz was run in its free Precise mode, which typesets the diagram by code the way Vizcept does (it needs a free account; none of the 10 used any credits). We judged each diagram by modern Reed–Kellogg conventions, the ones laid out on how to diagram a sentence.

Ten sentences, one run each, is a small test, and Vizcept is not error-free: on 50 longer sentences from Reed and Kellogg's own book it put a word or phrase on the wrong line in 17 (full test). Four of the pairs, unedited:

Sentence 2: "The book on the table belongs to my friend from college."

ConceptViz Precise: "friend from college" is written on one line, so the prepositional phrase "from college" is not diagrammed.

Vizcept: "from college" gets its own prepositional line under "friend".

Sentence 8: "Grandma gave the twins a puzzle for their birthday."

ConceptViz Precise: the indirect object "twins" sits on the baseline beside the verb.

Vizcept: "twins" on its own line under the verb, the way grammar books draw an indirect object.

Sentence 10: "I hope that you can come."

ConceptViz Precise: the object slot shows the label "noun clause" instead of the clause itself.

Vizcept: the noun clause stands on a pedestal in the object position, with "that" above it.

Sentence 1: "The cake was eaten by the children at the party." (a tie)

ConceptViz Precise: "at the party" hangs from the verb (where the eating happened).

Vizcept: "at the party" hangs from "children" (which children). Both readings are defensible; to get the other one, add a note such as "attach at the party to eaten".

Try your own hardest sentence in both before you decide.

Vizcept typesets grammar and thesis figures by code; ConceptViz covers more science illustrations and adds a conversational agent, PPTX export and an API. The table compares 14 features as of 18 October 2026.

Take one unit: three worksheets of 20 sentences each, 60 diagrams with answer keys.

• Vizcept: 60 diagrams × 2 credits = 120 credits, inside one $19.90 pack (150 credits, valid 365 days), or a month of BASIC at $14.90. You get the worksheets and answer keys as printable PDFs.
• ConceptViz: Precise diagrams are free with fair-use limits once you have a free account (our test diagrams used no credits), one sentence at a time, so the diagrams themselves can cost nothing; you would arrange them into a worksheet and key yourself. Its AI illustration mode uses 1 image credit per 2K image: 60 credits is roughly the 55-credit pack at $19.90 (65 with its bonus until 5 November 2026).

If you only need the occasional single diagram and don't mind the layout work, ConceptViz's free Precise mode is the cheaper route. If you print worksheets every week, the worksheet mode saves the layout time.

• You teach science across topics. ConceptViz has about 320 tool pages, mostly biology, chemistry, physics and earth science for U.S. classrooms. Vizcept covers a handful of those.
• You want to talk a figure through. Its agent shows a plan, draws a version, keeps the old one, and on Pro can plan up to six related figures from a document.
• You need slides or an API. PPTX export (Pro and Max) and an image API (Max) are not available on Vizcept.
• You make single sentence diagrams now and then. Its Precise mode is free with fair-use limits once you have a free account.
• You want credits that never expire. ConceptViz packs don't expire; Vizcept packs last 365 days.

• Your existing figures stay yours. ConceptViz's license lets paid accounts use figures commercially; nothing needs to move. Vizcept doesn't import ConceptViz files, so re-create a figure by pasting the same sentence or description.
• Check conventions once. Paste two or three sentences you already diagrammed and compare; the rules Vizcept follows are on how to diagram a sentence.
• Watermarks. Vizcept's free downloads are watermarked; ConceptViz's license says free-account diagrams carry its watermark, while its homepage says agent-trial figures don't. Clean files come with a paid plan or pack on both.
• Teachers: Vizcept for teachers shows how single diagrams and worksheets fit a grammar unit. Thesis writers: Vizcept for PhD students.