--- title: "SumizAI vs TreeTime" url: "https://sumizai.com/alternative-to/sumizai-alternative-to-treetime.html" date: "2026-08-14T00:00:00+02:00" modified: "2026-08-14T00:00:00+02:00" description: "Looking for a TreeTime alternative? SumizAI and TreeTime side by side: price, licence, platforms and what each one actually does." tags: ["ai notes", "sumizai", "treetime", "alternative to TreeTime"] --- # SumizAI vs TreeTime Looking for a TreeTime alternative? SumizAI and TreeTime side by side: price, licence, platforms and what each one actually does. ## What TreeTime is TreeTime is an information organizer that stores text, numbers, and other data in linked trees, with built-in mathematical operations — sums, ratios, differences — calculated and updated on the fly as source data changes. That combination of a hierarchical note structure with a live spreadsheet sets TreeTime apart from classic notebooks focused purely on text. Key features: The tree structure combines numeric and text data in one place, with nodes nestable to any depth — a sub-tree can hold both descriptive notes and numeric values used in calculations higher up the hierarchy. Automatic recalculation of sums, ratios, and differences updates instantly whenever any source value changes, much like spreadsheet formulas, but within a tree structure rather than a table. Export to multiple formats — PNG, SVG, HTML, CSV, and plain text — lets you use TreeTime data outside the app itself, in a report or presentation, for instance. A configurable web interface allows access to the data tree from a browser, with no need to install a separate app on every device. Open source code under the GPL-3.0 license allows full control and modification of the tool by the community. Who it's for: TreeTime appeals to people combining text notes with numeric data that needs ongoing calculation — accountants keeping personal budgets with an elaborate category structure, analysts tracking project metrics at multiple levels of detail, or hobbyists managing collections where numbers (cost, quantity, value) matter alongside description. Technically inclined people using Python and appreciating open source find TreeTime an easy tool to adapt to their own needs. Use cases: In practice, TreeTime works well for running a household budget organized into a tree of expense categories, where totals at higher levels update automatically as new entries are added lower down. A project manager can track a project budget split into tasks, with automatic summing of all subtask costs into the whole project's budget. A collector tracking a collection's value can organize items into categories and subcategories, with automatic summing of value at the level of the whole collection. A researcher assembling experimental data into a hierarchical structure uses automatic calculation of differences and ratios between data groups. Pricing and business model: TreeTime is free and open source under the GPL-3.0 license, with no charge for download or use. An open source community-driven development model means features and fixes appear through user and contributor engagement rather than commercial monetization pressure. Limitations and what to watch for: Combining notebook and spreadsheet functions in one tool means TreeTime doesn't fully match either specialized text notebooks or advanced spreadsheets in the depth of features within each domain separately. Availability limited to Windows, Linux, and Python means no native macOS version, a significant limitation for Apple computer users. The learning curve can be steeper than for simple notebooks, given the need to understand exactly how calculations propagate through the tree structure. AI notes with or without calculations: TreeTime has no built-in AI model integration, so preserving a ai notes entry from a conversation with an assistant requires manually pasting the text as a new tree node, with no automatic link to existing calculations. For users who would like fragments of AI conversations about numbers or analysis to automatically feed existing calculation structures, that means an extra manual step of fitting ai notes data into the numeric format used in the tree. Live calculations instead of static numbers: The key difference between TreeTime and a plain notebook with manually written numbers is that values in TreeTime are live — changing one number at the base of the tree instantly recalculates every sum and ratio higher up the hierarchy, with no manual recalculation and no risk of error. That approach, typical of spreadsheets, combined with a tree structure, makes it possible to model relationships a flat spreadsheet table can't capture as naturally. The web interface as a bridge between devices: TreeTime's configurable web interface allows viewing the data structure from any browser, which partly offsets the lack of a native mobile or macOS app — a user can check the state of their data tree from a phone or tablet, even though the desktop app itself only runs on Windows or Linux. Open code as a guarantee of correct calculations: Because TreeTime is open source, anyone interested can verify exactly how sums, ratios, and differences are calculated, instead of taking a closed product's word for it. That matters especially for budgets or financial data, where an error in a calculation formula could go unnoticed for a long time in a tool whose internal logic can't be checked. By comparison, popular commercial spreadsheets rarely offer insight into their calculation engine at this level of detail, making TreeTime a rare example of a fully transparent calculation tool. A niche but loyal community: As an open source project with a narrow, specific niche — combining a notebook with a spreadsheet in a tree structure — TreeTime attracts a relatively small but engaged group of users who genuinely need this particular combination of features. Bug reports and feature suggestions go directly to the developers, which for a smaller project is often a faster path to change than in large commercial products. What's worth checking before choosing: Before building an elaborate structure in TreeTime, it's worth checking whether the calculation features actually match your needs, or whether a plain spreadsheet would do — TreeTime makes the most sense when data naturally forms a hierarchy rather than a flat table. Bottom line: TreeTime is a niche but unique tool combining hierarchical notes with live mathematical calculations. Anyone who wants ai notes from AI conversations to land in an organized archive without manually fitting them into a calculation structure should consider a tool built specifically around that workflow. Comparison with SumizAI: TreeTime and SumizAI serve quite different purposes despite a shared core of notes. TreeTime combines notes with live mathematical calculations in a tree structure, useful wherever numbers and their relationships to each other matter. SumizAI focuses on ai notes generated from a conversation with an AI model — answers worth keeping land as Markdown files in a vault the user owns, with no calculation features, but an emphasis on simplicity and automation. Anyone who needs notes combined with calculations will pick TreeTime; anyone who wants ai notes from AI conversations to arise automatically without manual pasting will find SumizAI the better-fitting tool. **Key facts** - Price: Free - License: Open Source - Origin: Germany, EU - Category: Todo List Manager, Note-taking ## What SumizAI is A note-taking application built around a conversation with an AI model. You ask a question, the answer streams back, and the answers worth keeping become Markdown notes — filed into a vault that is a folder on your own disk. A vault is a directory holding `base.md`, a generated table of contents up to six levels deep, and a `notes/` folder with one `.md` file per note. Before a note is written it is checked against the ones already there, so the fourth note about the same idea gets merged instead of added. Links between notes are ordinary Markdown links to files that exist. The model is never ours: you bring your own API key to one of seven providers — Anthropic, OpenAI, Gemini, Groq, OpenRouter, a local Ollama or your own server — and pay that provider directly. A question sends the table of contents plus at most five relevant notes within a 24,000-character budget, and the app shows you which five it used. ## Where they differ - AlternativeTo's description of TreeTime does not mention an AI model. That is the whole starting point in SumizAI: you have a conversation with a model on your own API key, and the answers worth keeping become notes without you filing them. - TreeTime is open source (GPL-3.0), and SumizAI is not. If reading the source is what decides it for you, that is a real argument for TreeTime. The guarantee SumizAI offers instead is structural rather than legal: the notes are Markdown files in a folder you chose, so they open in any editor whether or not the application is running. - AlternativeTo's description of TreeTime does not mention Markdown, so check what format your notes end up in before you fill it up. SumizAI writes standard `.md` files to a folder you picked, and an unpaid account can still export all of them. - AlternativeTo lists no mobile version of TreeTime. SumizAI runs on macOS, Windows, iOS and Android. - Both export. SumizAI exports a whole vault as a PDF — summary or full detail — or as a `.pptx` deck in table-of-contents order, with fifteen slide themes. - Both are run from the EU: SumizAI's operator is registered in Poland and the servers are in Germany. Full side-by-side comparison table and pricing: [https://sumizai.com/alternative-to/sumizai-alternative-to-treetime.html](https://sumizai.com/alternative-to/sumizai-alternative-to-treetime.html)