Cheap physical maintenance-interval timers for household items
Problem
People who maintain home equipment (HVAC filters, water softeners, pump seals, knives, etc.) constantly forget when each item was last serviced. Written or digital logs fail because you forget to update them; the reminder needs to live physically on the object itself. The poster wants cheap dumb timers that attach to items and show days-since-last-reset, buyable in bulk for a few bucks each.
Opportunity
A line of low-cost e-ink/LCD 'days since last service' tags (sold in packs) plus an optional companion app that scans/NFC-syncs reset events and keeps a history of intervals per item. Would serve homeowners, landlords, and small workshops.
Market analysis
The pain is real and the physical-on-object insight is the genuine differentiator, but web search found no cheap 'days since service' tag hardware on the market — only phone apps (Quitly, CountDays) and built-in appliance indicators. That gap exists for a reason: sub-$5 e-ink/LCD tags with multi-year coin-cell life demand volume manufacturing and inventory that a solo software builder rarely survives.
Market · Homeowners, landlords, and small workshops maintaining filters, softeners, and tools; steady niche demand evidenced by appliance makers building indicators in.
Pricing · Impulse-purchase multipacks at roughly $3-8 per tag; free apps and built-in fridge indicators anchor expectations near zero, leaving razor-thin hardware margins.
Pros
- + Physical placement on the object is the real insight no app can copy.
- + Natural bulk purchase: a home needs 5-10 tags, workshops more.
- + Companion app creates a defensible software layer over commodity hardware.
Cons
- − Hardware margins, MOQs, and inventory risk are brutal for a solo builder.
- − Generic LCD countdown timers on marketplaces would commoditize it fast.
- − Coin-cell life of 3-5 years is an unforgiving engineering constraint.
Existing / similar tools
Source
r/Doesthisexist (Reddit)
The interesting route around the hardware problem is to not design hardware at all: re-flash commodity electronic shelf labels (ESL), which are already mass-produced as ultra-low-power e-ink tags with years of battery life, and sell them pre-provisioned as maintenance tags. The moat is not the tag — it is the reset UX (one gloved-finger button press in a utility room) and the interval history in the app, because ‘when did I last change the filter’ only has value when the answer is trusted. That also means the honest business is the recurring-intelligence layer, not the plastic: nobody pays a subscription for a countdown sticker, but landlords might pay for proof-of-maintenance logs across units.