Fungible

Personal finance, keyboard-first. Available as a terminal UI or a desktop app — both running over the same local data: Plaid sync, CSV import, categorize, tag, search, analyze. Plus an MCP server so Claude can read and manage it for you.

Terminal UI

Desktop GUI

Features

• Plaid sync — connect bank accounts and pull transactions automatically; 15-min debounce with force-sync option
• CSV import — import statement exports from any bank with flexible column mapping
• Balance history import — load past balances from a date,account,balance CSV to fill in net worth history
• Manual assets — track a house, car, or other asset by name and value
• Category & name rules — substring or regex rules that auto-categorize and rename transactions; survives re-syncs
• Spending flexibility — tag categories as fixed / flexible / discretionary; see breakdown on Dashboard
• Scorecard — categories flagged over / under the typical month against a 12-month median baseline, with a net verdict and optional delta columns (prior period, same period last year, 12-month average); heat-map coloring
• Tags — label transactions across accounts (trips, projects, events) and view summaries by tag
• Net worth — balance history with asset/liability breakdown; by account or by type; import earlier balances from CSV
• Financial health — cash and liquid runway, FIRE number and progress, years to retirement with adjustable assumptions
• Trends — bar charts for expenses, income, net, or any category; per-range aggregation
• Regex search — shared across Dashboard, Transactions, and Trends
• Dedup review — review and remove CSV transactions that duplicate Plaid imports
• MCP server + HTTP API — Claude (or any script) can read and manage your finances
• Daily backups — kept at ~/.fungible/backups/, last 7 by default (configurable via FUNGIBLE_BACKUP_DAYS)

Try it (no account needed)

fungible --demo

Spins up a fully pre-loaded instance with fake accounts, transactions, tags, and rules — completely isolated from any real data. Good for exploring before connecting a bank.

In the desktop app, pick "Try Demo Mode" from the app menu (macOS) or Help menu (Windows/Linux) — the app relaunches with the same isolated demo dataset.

Install

Terminal UI

Homebrew (recommended)

brew tap tomfunk/fungible
brew install fungible
fungible --setup     # first-time setup wizard
fungible --version   # print installed version
fungible

From source (Node.js 22+, also works on Linux/WSL)

git clone https://github.com/tomfunk/fungible
cd fungible
npm install
npm run dev -- --setup   # first-time setup
npm run dev

Desktop GUI

Download an installer from the latest release (macOS arm64, Windows x64, Linux x64), or run from source:

npm install
npm run gui

The GUI reads/writes the same ~/.fungible/ database as the TUI — switch freely.

For first-launch caveats on the un-notarized installers (Gatekeeper, SmartScreen) and packaging details, see docs/gui.md.

Storage

Data and config live at ~/.fungible/ (override with $FUNGIBLE_DATA_DIR). Plaid access tokens are encrypted at rest using a key file at ~/.fungible/key — do not delete this file or you will need to re-link your accounts. A free Plaid developer account (sandbox tier) is enough.

Banks that use OAuth (Chase, Amex, Wells Fargo, ...)

These banks send you to their own site to sign in. In a desktop browser Plaid opens that site in a popup, which needs no setup. If Link fails before you reach the bank, the page shows Plaid's error code and Link session ID. In production, a code like INSTITUTION_REGISTRATION_REQUIRED means your Plaid team is not yet enabled for that bank: check US OAuth institutions in the Plaid Dashboard (Chase also requires the security questionnaire).

If popups are not an option, fungible can take the bank's full-page redirect instead. Plaid accepts http://localhost redirect URIs only in sandbox; in production the redirect must be HTTPS, so the local link server needs a certificate for localhost, for example from mkcert:

mkcert -install   # adds mkcert's local CA to your system trust store (once)
mkcert -cert-file ~/.fungible/localhost.pem -key-file ~/.fungible/localhost-key.pem localhost

Then add to ~/.fungible/.env, using full paths (~ is not expanded there):

PLAID_REDIRECT_URI=https://localhost:4747/oauth-return
FUNGIBLE_LINK_TLS_CERT=/Users/you/.fungible/localhost.pem
FUNGIBLE_LINK_TLS_KEY=/Users/you/.fungible/localhost-key.pem

and register the same URI, exactly as written, under Allowed redirect URIs on the Plaid Dashboard's Developers > API page. The link server then listens on that port, over HTTPS. Leave PLAID_REDIRECT_URI unset to keep the default behaviour.

Running

Command	What starts
fungible	TUI + MCP server (HTTP, port 3741) + REST API (port 3456)
Fungible.app (GUI)	Electron window only — MCP/API not auto-started
fungible mcp	stdio MCP server only — use this in your Claude Desktop config
fungible api	REST API server only

FUNGIBLE_MCP_PORT and FUNGIBLE_API_PORT (in ~/.fungible/.env) override the defaults.

Screens

Key	Screen
0	Settings
1	Dashboard
2	Transactions
3	Trends
4	Net Worth
5	Tags
6	Financial Health
7	Rules
8	Accounts
9	Canvas

Full per-screen keybindings: docs/keybindings.md.

Docs

• docs/keybindings.md — per-screen keyboard reference
• docs/integrations.md — HTTP API and MCP server setup, full tool list
• docs/gui.md — desktop app install, packaging, release flow
• docs/testing.md — how to run tests and what each kind should assert
• CONTRIBUTING.md — branching policy, tests, PRs