Tinderbox vs Understory
Price, platforms and features side by side. The table says where each price was read and when.
Tinderbox
Mac tool for mapping, analyzing and sharing notes
Understory
Mac notes app for outlining and drafting essays, papers and books
Where they differ
- Tinderbox starts at $289 one-time license, with a year of free updates. Understory starts at $24.99 one-time purchase.
- Understory has a free plan. Tinderbox does not, though it has a free trial.
- Understory also covers Markdown and long-form writing.
At a glance
| Tinderbox | Understory | |
|---|---|---|
| Pricing | Free trial | Free plan |
| Starts at | $289 one-time license, with a year of free updates | $24.99 one-time purchase |
| Free plan | None | Every feature, with up to 100 notes in the Personal Notebook and 20 in each Project Notebook. At the cap, notes already written can still be read and edited. |
| Free trial | Free demo with every feature, limited to about thirty notes | None listed |
| macOS | ||
| Made by | Eastgate Systems, Inc. | Allen Ussher |
| Price read from | eastgate.com | understory.ussherpress.com |
| Checked | Oct 6, 2026 | Oct 9, 2026 |
Who each one suits
Tinderbox
- Writers, researchers and analysts working through large sets of notes
- People who want several visual views of the same material
- Mac users who prefer files kept on their own computer
Understory
- Students and researchers turning reading notes into a paper
- Writers who outline before drafting an essay, script or book
- Mac users who want notes kept as plain Markdown files
Worth knowing
Tinderbox
- Mac only: it requires macOS 12 or later, and iPhone and iPad use relies on sharing notes with other apps.
- The license includes one year of free updates; upgrading later from any previous version is listed at $98 and adds another year.
- The free demo does everything the full version does but can only make about thirty notes.
Understory
- It is a Mac app only, requiring macOS 14.8 or later; the FAQ says there is no iPhone or iPad version yet.
- The free version stops at 100 notes in the Personal Notebook and 20 in each Project Notebook.
- Sync between Macs covers only the Personal Notebook and needs an iCloud account; Project Notebooks are local folders.
- The App Store release notes for version 1.1 (October 2026) describe the Publish feature as experimental.
Key features
Tinderbox
- Maps, outlines, timelines and charts
- The same notes can be shown as a spatial map, an outline, a timeline or a chart, so structure emerges as notes are arranged, colored and linked.
- Agents
- Agents scan the document continuously and collect notes that meet your criteria, such as overdue tasks or a topic, and can feed project dashboards.
- Prototypes and the attribute browser
- A note inherits from its prototype unless you say otherwise, so one change updates every note based on it. The attribute browser breaks notes down by a chosen category.
- AI connections
- Built-in recognition finds addresses, names and organizations in notes, and a bridge to AI models can supply them with resources and prompts kept in a Hints folder.
- Open files and flexible export
- Documents are XML files stored on your Mac rather than on a server, and export produces HTML, XML, RSS, OPML and other formats.
- Works with other note apps
- Notes can be shared with Apple Notes, Simplenote, Evernote and DEVONthink for use on iPhone and iPad, and files sync through Dropbox or iCloud Drive.
Understory
- Notes and subnotes
- A note is plain text and needs no title or filename. Any note can hold subnotes, each a full note with its own text, links and attachments, so a note grows into a tree.
- One note in several outlines
- The same note can appear in more than one tree without being copied. An edit in one place shows up in the others, and shared notes are shown in italics.
- Two-way links
- Wiki-style links connect notes in the text, and the linked note shows a backlink automatically. Anchors can point to a specific place inside another note.
- Publishing
- Selected notes or a whole outline can be published in their arranged order as a PDF with bookmarks and page numbers, Rich Text, Markdown or a website, or printed.
- Markdown folders or iCloud
- A Project Notebook is a folder on the Mac holding one Markdown file per note. A Personal Notebook lives in the user's own iCloud account and syncs between Macs.
- Version history
- Every version of a note is kept, so an earlier draft can be read again and brought back. Deleted notes go to a trash.
Plans
Tinderbox
Tinderbox$289
one-time license, with a year of free updates
Tinderbox 11.8 for Mac. The order page also showed a $217 SummerFest sale price, but the checkout listed no discount when checked.
Household$325
one-time license for up to five people
Family pack for up to five people living in the same household, for use on any of their computers.
Ten Pack$645
one-time ten-user license
Aimed at schools, libraries and work teams. 50- and 100-workstation licenses are listed at $1,595 and $2,695.
Understory
Free$0
Up to 100 notes in the Personal Notebook and 20 in each Project Notebook, with every feature included, from publishing to iCloud sync.
One-Time Payment$24.99
one-time purchase (US Mac App Store)
Removes the note caps and opens shared notebooks of any size for editing. The vendor notes that the App Store sets a different price in each region.
Ways to pay less
Tinderbox
- Other savings
Household and multi-user licenses
A Household license covers up to five people living together for $325, and a ten-user license costs $645, against $289 for a single license.
- Other savings
Update subscription with a cheaper first year
An update subscription renews the yearly updates automatically. Its first year is listed at $83, with later years at the regular upgrade price, currently $98.
Understory
No public discounts listed.
