Yonder · competitor observatory — Walthamstow E17
Watching the heat.
Around-the-clock demand tracking for Walthamstow's saunas — every seat at Arvo and Community Sauna Baths, scanned from a Raspberry Pi and settled to the seat.
01 — This week
The week in heat.
Pick any week from the strip below — those cards are just the picker, each carrying a tiny seven-day preview. The full schedule underneath then draws that week session by session, each one coloured by how full it finished: pale sand when empty, deep ember when sold out.
Week picker — tap a card to load it below
02 — Patterns
Rhythms & rituals.
The month, day by day
The month around the week selected on the schedule above — each day coloured by how full it ran.
Weekly rhythm
How many seats were booked each week, and what share of all seats that filled.
The hot hours
Average fullness by weekday and start hour, across the whole record.
By session type
Which formats sell the most seats, and how full each one runs.
03 — Comparison
Site comparison.
Seat-weighted weekly occupancy, both venues on one axis. Arvo joined the record on 10 June — its line is young.
04 — The ledger
Provenance & raw record.
Community — exact
Booked / capacity read straight from the booking backend, settled within four days. Overbooking is real — walk-ins flex a 49-seat slot to 52, so 106% is genuine. Reliable from 17 Mar 2026; the backend purges history after ~90 days.
Arvo — inferred
Scraped from the booking widget. Capacity is the most seats ever observed per slot, and each session's final fill is its last scan before start — bookings close early, so that is the bookable final. Tracked since 10 Jun 2026.
Income — an estimate
Pay-as-you-go price × bookings, summed. Arvo prices are scraped per session; Community uses configured PAYG rates (£9.50 off-peak / £16.50 peak). Memberships, concessions and free sessions are not counted.
Latest scans
| Scanned | Type | Venue | Session | Date | Start | Fill |
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