KPIs at a glance
Estimated cost, tokens, turns and model time for the period, with the priced turn count and prompt count underneath.
macOS 14 Sonoma or newer · Universal · Free, MIT
What your Devin sessions burn,
in the menu bar.
Otter Stats reads the local Devin CLI and Devin Desktop database and shows tokens, turns, model time and an estimated cost at list prices, per agent, model, project and session. Read only. Nothing leaves your Mac.
Install with Homebrew
brew install --cask chris-wozniczek/tap/otter-stats
Then open -a OtterStats. The otter appears in your menu bar.
Ad-hoc signed for now (no Apple Developer ID yet). Homebrew clears the Gatekeeper quarantine flag for you; for the manual download, right-click the app and choose Open the first time.
Est. costtokens × list price, not your bill
Tokensinput, output, cache read
Turnsone assistant message with metrics
Model timeseconds the model spent per turn
Dashboard
The full report, as a native window.
Overview, Agents, Models, Timeline, Projects, Sessions, Tools, Efficiency and Methodology. Period picker from today to everything embedded, plus a custom date range with a calendar, search, a pricing class filter (paid, free tier, unknown), and click to filter on any bucket, agent, model, project or session.
Same numbers as otter stats
Otter Stats is the usage side of Otter Swarm's /otter:stats report, packaged as a standalone app for people who don't run the plugin. Attribution is structural: each assistant turn is walked up the message tree to its root. Duplicates are collapsed once. Pricing comes from the same price snapshot.
Caveats are shown, not hidden
Duplicate rows, unknown attribution, missing metrics, unpriced models and truncation are all surfaced in the report. When a model has no price, the turn is marked unpriced and the cost shows as a lower bound with a ≥ sign.
Privacy
Everything stays on your Mac.
The sessions database at ~/.local/share/devin/cli/sessions.db is opened read only. There is no account, no telemetry and no server. The only network request the app makes is the optional daily version check against the GitHub Releases API, and it carries nothing about you.
- Read only access to the local database
- No data sent anywhere
- No Dock icon, lives in the menu bar
- Cost is a local estimate, never an invoice
- Open source, MIT licensed
Install
Three ways to get it.
Requirements: macOS 14 Sonoma or newer. Devin CLI or Devin Desktop for real data. No Devin data yet? Turn on demo mode and explore the UI with a synthetic database.
Homebrew recommended
brew install --cask chris-wozniczek/tap/otter-stats
open -a OtterStats
Upgrade with brew upgrade --cask otter-stats. Remove with brew uninstall --cask otter-stats; add --zap to also delete settings and demo data.
Manual download
Download OtterStats.zip from the latest release, unzip, drag OtterStats.app to /Applications, open it.
The app is ad-hoc signed, so on first launch macOS may ask you to confirm: right-click the app and choose Open, or allow it under System Settings › Privacy & Security.
Latest releaseBuild from source
git clone https://github.com/chris-wozniczek/otter-stats.git
cd otter-stats
Scripts/build-app.sh --zip
open dist/OtterStats.app
Produces a universal, ad-hoc signed dist/OtterStats.app. Set CODESIGN_ID to sign with your own identity.
First run
- Otter Stats lives only in the menu bar. Look for the otter next to the clock.
- If you already use Devin CLI or Devin Desktop, your usage appears immediately. Otherwise click Try demo data.
- For cost estimates the app needs a price snapshot. Settings › Refresh prices runs
devin models listonce, or it reuses the one Otter Swarm writes to~/.config/devin/otter/prices.json.
Data sources
Where the numbers come from.
| What | Default | Override |
|---|---|---|
| Sessions database | ~/.local/share/devin/cli/sessions.db | OTTER_SESSIONS_DB or Settings |
| Price snapshot | ~/.config/devin/otter/prices.json | OTTER_PRICES_PATH or Settings |
| Role pins (drift check) | ~/.config/devin/agents/<role>.md | none |
Methodology
How a turn becomes a number.
Turn
One assistant chat_message row with usage metrics. Duplicate rows for the same message are collapsed once, and the count is reported.
Buckets
Lead = normal, plan and ask profiles. Otter workers = planner, researcher, implementer, reviewer, tester, interrogator. Other subagent_* profiles = Other subagents. Summarizer and compactor = Housekeeping. Chains that can't be resolved = Unknown.
Tokens
Input + output + cache read. Cache writes are shown separately.
Estimated cost
Per-turn tokens × the price snapshot. Models the snapshot marks as free tier count as $0. It is a list price equivalent of the usage, computed locally, never an invoice.
Pricing classes
Every model is Paid, Free tier or Unknown according to the snapshot. Unknown turns are unpriced and turn the total into a lower bound marked ≥. You can filter the whole dashboard by class.
Equivalent paid cost
What the free tier turns would have cost at the paid SWE rate (SWE-1.7 when it is in the snapshot). Shown next to the estimate as a simulation, never as a charge.
FAQ
Questions people ask first.
Does it work without Devin installed?
The app opens, but there is nothing to read. Turn on Settings › Demo mode or click Try demo data to generate a deterministic synthetic database in ~/Library/Application Support/OtterStats/ and explore the UI.
I am on a subscription plan. Why do I see dollars?
The dollar figure is your token usage priced at the per-token list rates from devin models list. It is there so you can compare agents, models and sessions on one scale and see where the usage goes. It is not what you are charged. On a plan your actual cost is the plan. Models the snapshot marks as free tier count as $0, and a separate Equivalent paid cost shows what those turns would have cost at the paid SWE rate, labelled as a simulation.
Why does cost show a ≥ sign?
At least one model in the period has no entry in the price snapshot. Those turns are counted as unpriced and the total is a lower bound. Run Settings › Refresh prices to fetch a fresh snapshot.
Is this an official Devin or Cognition product?
No. It is an independent open source app that reads the local database the Devin CLI writes. Cost figures are estimates from a price snapshot and are not a bill.
Which architectures are supported?
The release build is a universal binary for Apple silicon and Intel Macs, on macOS 14 Sonoma or newer.
How do updates work?
At launch and then once a day the app asks the GitHub Releases API for the latest version. When a newer release exists you get a banner in the popover. Settings › Updates has Check now and lets you unskip a version. The app never downloads or installs updates itself; use brew upgrade --cask otter-stats or the release page.
Can I reuse the engine?
Yes. OtterStatsCore is a Swift package with no UI dependency: read only SQLite reader, tree attribution, usage cube, slicing and filters, prices and a synthetic fixture generator. It can back a widget extension or a CLI.
See what your sessions burn.
brew install --cask chris-wozniczek/tap/otter-stats