What People Actually Build With Muse

People use the Muse personal agent mostly to recover money and time: negotiating bills, auditing receipts, claiming refunds and handling errands in the background. Developers use Muse Spark and Muse Code to build games, editor plugins and coding pipelines, and they run the open-weights Muse Glimmer model locally as an offline agent. Every example below is a real, linked entry in the shipwithmuse catalog.

The catalog is hand-sorted, so it tilts toward things people bothered to post publicly. Treat it as a sample of what works, not a census. Numbers are as reported by the authors.

Saving money: the most common Muse agent use case

Money comes up more than anything else. One builder who assembled a library of roughly 500 Muse use cases found that 20% were about money. Our own entries agree.

• Bill negotiation. Chandra Bhavanasi authorized Muse to accept any AT&T fiber offer under $70 a month, and it came back with $40 a month plus three months free. Another user had Muse call Xfinity by phone; it reached a human, hit a verification text it couldn't read, and patched him into the live call.
• Receipt audits. Idobn had Muse read six months of email receipts. It found a forgotten $100/month subscription on a corporate card, about $1,200 a year.
• Refunds and credits. Ejaaz asked Muse to claim compensation for a seven-hour Delta delay and had a $250 credit five minutes later, plus a rebooked flight.
• Found money. One user had Muse search every state's unclaimed property database and it found $88.92. Another applied a Verizon gift card to an account balance.
• Insurance. Joshua Liu says Muse saved him $113 a month on car insurance.

The pattern is the same each time: a bounded task, a clear authority ("accept anything under $70"), and a vendor with a web chat or phone line the agent can work through.

Errands, calls and bookings

Muse runs in its own cloud VM with a browser and keeps working after you close the app, so errands that involve waiting are a natural fit.

Matt Schlicht's Muse called five Tesla stores at once to find one with the car his wife wanted to see. Alex Volkov gave Muse and a rival agent the same job, finding Rosh Hashanah dinner tickets, and Muse booked through Link while the other was still searching. One Reddit user had Muse price books from photos and list them on eBay, then track a water-filter schedule.

Official connectors extend this. Duffel handles flights across 500+ airlines, Ticketmaster and Fever cover events, and Instacart is bringing groceries. See how Muse pays for things for the checkout side.

Organizing personal data

A quieter group of use cases is bulk cleanup that nobody wants to do by hand.

• Sorting 18 Spotify playlists of about 200 songs each into decades and genres. The same user's attempt on 40,000 Google Photos failed, which is useful to know.
• Merging 400 Google Docs into one 400-page PDF.
• Connecting school and sports feeds for kids' grades and game schedules in about 30 minutes.
• Screening 50 unread Instagram DMs without marking them read, and finding inactive follows.

Publishing: sites, books, podcasts

Muse can create files and publish share pages on muse.ai. Users have built a world-history library site, a game wiki (flagged by its author as not fully accurate), and a workout tracker with a home-screen shortcut. One user published two books on Amazon KDP. David Singleton pairs podcasts with scheduled tasks so Muse makes a new AI-news episode every day. More in content and growth.

Custom connectors and power-user setups

Muse can write its own integration code for any service with an API. A Reddit demo shows it building a Linear connector in under a minute. Others went further: one user joined the Muse VM to a Tailscale network to run commands on a home server, and Greg Ceccarelli ran Claude Code inside his Muse VM.

Developers are also building connectors for the directory: an HVAC and plumbing booking connector, a payee-change verifier, and a Cloudflare Workers starter. The connectors guide covers how that works.

What developers build with Muse Spark and Muse Code

Muse Spark is the model; Muse Code is Meta's terminal coding agent. The catalog's games category is heavy with Spark one-shots: a pirate platformer, a single-file Three.js platformer that passed 25/25 browser checks, and a Minecraft-style world its author says cost 10 cents. Dilmer Valecillos converted a minigolf prototype to VR for Quest 3 with Muse Code.

Tooling is the other big group: Muse Code in Zed and JetBrains, a VS Code extension, and Claude Code plugins that hand work to Muse Code. Details in Muse Spark for developers.

Running Muse Glimmer locally

Muse Glimmer is Meta's Apache 2.0 open-weights model, and the local crowd has run it everywhere: a 12GB laptop GPU at 100K context, a Qualcomm Dragonwing board, and a single AMD MI300X. Mozilla.ai had a local Glimmer agent open a real pull request. Setup notes are in running Muse Glimmer locally.

What doesn't work well yet

The failures are informative. The 40,000-photo sort failed. The Xfinity phone call stalled on a verification text. Amazon blocked Muse purchases from September 20, and one user responded by building a self-hosted cart API Muse reaches over SSH. An accessibility review found VoiceOver problems. If you have a build of your own, submit it.

Frequently asked questions

What is Muse best used for?

Based on public reports, Muse is strongest at bounded errands with a clear goal: negotiating a bill under a set price, auditing receipts, claiming a delay refund or booking tickets. It works in the background and asks for approval before sending email or spending money.

Can Muse build apps and websites?

Yes. Users have had the Muse agent build and publish simple sites and a workout-tracker app on muse.ai. For serious code, developers use Muse Code or the Muse Spark API, which have been used for games, editor extensions and full-stack projects.

Is Muse good at negotiating bills?

Several users report real savings, including an AT&T bill cut to $40 a month and $113 a month off car insurance. Results depend on the vendor, and one phone negotiation stalled when a verification text went to the user.

Where can I find more Muse use cases?

The shipwithmuse catalog lists sourced builds by category and type. The community-maintained awesome-meta-muse list collects 156 more, each linked to its original post.