The score the readme does not print
A local mail scorer with no key, beside a client that still talks to the mailbox.
- Category
- Productivity
- Who it is for
- Someone who wants a self-hosted inbox and a first sort without a model bill.
- Possible model
- Open source
- Difficulty
- Hard
- Inspired by
- Raven · Raven
- Original launch
- Watch the launch · Oct 24, 2026
Difficulty is an editorial estimate of technical and operational complexity, not a score.
Startup idea analysis by Startup Ideas. Last reviewed Oct 25, 2026. How we read a launch.
The startup idea
Vxrcel posted Kage on October 24. It is a classifier inside Raven, an open-source mail client. No API key, no account, no network call. A blind test got intent right 85 percent of the time. The old keyword rules got 65. The repository is kleenpulse/raven-mail. The license is AGPL-3.0. Raven is self-hosted, for Gmail, Outlook, Yahoo, iCloud, Fastmail, Proton Bridge, and any IMAP mailbox. Credentials live in an encrypted cookie, not a password database. Jev is the assistant that uses a key. It picks from fixed options and cites the emails. Kage answers that same contract with no network and no account. It scores each option with BM25 over word stems and a small lexicon, then turns the scores into probabilities. It never writes text. The readme does not print 85 percent or 65 percent. The client still reaches a mail server. Kage is the piece that does not. This page did not score an inbox.
The opportunity is a first pass that does not spend a model, on mail that should stay in the browser cookie. A smaller product is the fixed choices, the BM25 line, and no percentage the repository has not published. The 85 percent is the post. It is not a result this page can repeat as measured.
Do not say the whole client is offline. The mailbox is not. Do not print 85 percent as Raven's number.
The problem
The inbox is long, and a keyword rule is a blunt guess.
Who would pay for this?
- Primary
- Someone who wants a self-hosted inbox and a first sort without a model bill.
- Secondary
- A person who will run bun, set a session secret, and connect IMAP.
- Early adopter
- One mailbox, one fixed choice, and the score left unclaimed.
How could it make money?
Possible models. Nothing here is a claim about what Raven charges.
- No price. AGPL-3.0.
- Jev is the path that wants a key.
- Kage does not.
What would the MVP look like?
- Kage on one mailbox.
- A choice that cites the mail.
- No network call from the scorer.
- The 85 percent kept out until the readme has it.
How to validate the idea
- Ask five people to check whether a cited mail matches the choice.
- If the number is not in the repo, do not put it on the page.
- Do not count a keyword rule as the same engine.
How to differentiate
- The scorer writes no sentences.
- Credentials stay in the browser cookie.
- Jev and Kage share a contract, and only one needs a key.
- Do not become a mail host.
Original product launch
This launch is inspiration and evidence that someone shipped, not a partnership. The idea above is our reading of the broader opportunity. Raven did not write it.
- Product
- Raven
- Source
- Raven
- Film
- Kage, the readme has no 85 percent
- Posted
- Oct 24, 2026 · 0:22
Product that inspired this idea
Vxrcel's post says Kage, a classifier inside the Raven mail client, needs no API key, no account, and no network call. On a blind test it got intent right 85 percent of the time. Keyword rules got 65. The repository is kleenpulse/raven-mail. The license is AGPL-3.0. Raven is a self-hosted client for Gmail, Outlook, and any IMAP mailbox. Mail credentials sit in an encrypted cookie. Kage answers the same fixed choices as Jev, the assistant that uses a key, but with no network. It scores options with BM25 over word stems and a small mail lexicon. It never writes text. The readme does not print 85 percent, or 65. The mail client still talks to a mailbox. This page did not open an inbox.
Posted by @kleen_pulse. Watch the original launch. No separate product site is listed unless the post itself is the source.
- local
Related startup ideas
- The outlier that waits for a key
A local MIT tool that ranks YouTube videos by views over subscribers, and stays on fixtures until you add two keys.
- A note on the trackpad, not an iPad
A floating note a passive stylus can write on the MacBook trackpad, with the missing hover and the iPad limit on the same page.
- A workspace for the artifacts around a project
One visual place for the plans, notes, and files a person accumulates while making something.
- Convert the file where it already is
Right-click a file, pick a format, and finish on the machine. Upload only if the person asked for a phone or a browser.
- Dictation that pastes the cleaned sentence
Hold a key, talk, and drop a cleaned sentence into whatever app already has the cursor.
- The apply button that is a different app
A MIT job search that keeps the CV in the browser, and a Windows app that applies only after you allow it.
Looking for more ideas?
The full list is startup ideas for 2026, each one tied to a launch you can watch.
Browse startup ideas for 2026