Programmable timer web app (for gym workouts or stretching sessions)
Over the last couple of months, I’ve been building a timer web app for myself that I use for workout and stretching sessions. My main use-case is gym routines that consist of repeatable sequences, e.g. where you are holding certain positions for a set time (rinse and repeat). The app counts down the program, beeps, and reads the activities out loud.Two things (I suppose) are special about it:- The timers are “programmable”, so you can freely express your own routines and procedures in a declarative notation.- The app is all static (no backend): the entire program is encoded in the URL and can be bookmarked or shared/transferred via QR-code.You can check it out at https://timer.jotaen.net, optionally with a demo program pre-loaded: https://timer.jotaen.net/#demo.Source code is at https://github.com/jotaen/timer. I’ve also written up a small behind-the-scenes on my blog: https://www.jotaen.net/SAKxq
FL score
out of 100
Verdict
medium confidence
Competition
No competitor data yet
Trend
No signal yet
A shareable, URL-encoded workout timer that eliminates the friction of setting up interval sequences on your phone.
The pain
The gap
Build angle
Strengths
- Solves a real, repeated problem (setup time for interval workouts)
- Technical execution is clean, no backend dependency removes hosting costs and privacy concerns
- Sharing mechanism is genuinely frictionless compared to alternatives
- Already built and in personal use, so core functionality is validated
- Low maintenance burden due to static architecture
Risks
- Market size is unclear, how many people actually need programmable timers versus using Apple's built-in timer or YouTube videos?
- No monetization path identified. Free tools rarely generate revenue unless they have massive scale or feed into a paid product.
- Competitive threat from established fitness apps (Apple Health, Fitbod, Strong) adding timer features
- User acquisition is hard without marketing spend. Fitness app users are sticky to their existing tools.
- The 'programmable' feature may be a feature only power users want; most people may prefer simple presets
- No evidence that URL-sharing is better than app-based sharing for routine distribution
Fly Labs Method
Is the pain real, is there a gap, is it the right time, can one person build it.
Value Equation
Dream outcome and how likely it feels, against the time and effort it costs.
One-Person Business
Curiosity pull, identity fit, and a path from free value to paid for a solo creator.
Viral Frameworks
Hook strength, shareability, and how cheaply it can be tested.
Builder Lens
Evidence the problem exists, timing, defensibility, and a model that fits on a napkin.
Five lenses, one composite. How scoring works
The angle
No market research recorded for this idea yet.
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