StirFle-OStirFle-O
/stˈɚːflóʊ/Track order shapes the mood.
StirFle-O reads a Spotify or Apple Music playlist, diagnoses its musical personality, and rearranges the track order for a smoother listening experience.
"Stir" (mix up) + "flow" (the flow of tracks). The name carries the wish to stir up your playlist's flow and bring it a different flavour. A retrofit, but let's say the O stands for Optimization or Orientation.
What it does
Personality diagnosis
Five-axis analysis classifies your playlist as one of 32 personality types.
Playlist score
A 100-point score split between selection and order, with feedback.
Genre & era distributions
See your playlist's genre mix and decade- or year-by-year breakdown.
Artist origin map
A choropleth world map showing where your artists are from (data from Wikidata).
Track reordering
Five rulesets (flowing / contrast / workout / chill / discovery) optimise the order.
Compare with friends
Overlay a friend's playlist diagnosis to compare shared artists, songs and genres, your sync rate, and where your tastes differ.
Type distribution
See how common your personality type is among all the playlists diagnosed so far.
Who it's for
- You want an objective look at your playlist's musical tendencies.
- You want a playlist with good flow rather than relying on shuffle.
- You want to share your diagnosis with friends.
About the developer
Just a music enthusiast.
Lots of people add favourite Spotify tracks to a single playlist as they go — but maintaining the track order is tedious, isn't it? I'd toss songs in without much thought, and when I played the whole playlist back, the transitions felt jarring or the same artist would come up three times in a row. Shuffle is one solution, but it's not very interesting; I wanted to reorder by some specific criterion. That's what made me build this site. …or so I tell myself in retrospect. The real reason was thinking it'd be fun to do a personality-quiz kind of thing based on a playlist. If you find any bugs or have requests, please reach out via DM on X.
Favourite music genres: Emo / Post-rock / Math rock / Electronica / House / Chiptune.
If we ever cross paths at a live show, let's grab a drink! 🍻
Built and maintained solo. If you've enjoyed StirFle-O, a tip on Buy Me a Coffee would be a lovely encouragement. ☕
Data & privacy
- Only public playlists are accessed. We read track metadata, never your full library.
- No personal account data (followed artists, listening history) is collected from Spotify or Apple Music.
- Diagnosis results are stored anonymously, just enough to power shareable URLs.
- For aggregate analytics, an approximate location (country / region / city) is derived from your IP address via freeipapi.com (with ipinfo.io as a fallback). The IP itself is never stored — we keep only the derived location.