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Aion — Free Open-Source Interval Timer. No Ads, No Tracking. — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Fitness And Exercise →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
theintervaltimer.com ↗	71 match 1 shared topics	Interval Timer - Online HIIT, Tabata, EMOM, AMRAP Timer	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
reptimer.app ↗	70 match 1 shared topics	Workout Interval Timer \| Free Online Interval Timer App for HIIT & Tabata \| RepTimer	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
repflowapp.com ↗	70 match 1 shared topics	RepFlow – HIIT & Interval Workout Timer	en	fitness-and-exercise	robots llmsaihumans	emailphone	none
simplytimer.com ↗	70 match 1 shared topics	Simplytimer - Your Interval Timer App	en	fitness-and-exercise WordPress	robotsllmsaihumans	emailphone	partial · 8
fitpulsetracker.app ↗	67 match 1 shared topics	FitPulseTracker — Free iOS Workout App	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
the75app.com ↗	67 match 1 shared topics	75 Hard Tracker — The Free Challenge Tracking App	en	fitness-and-exercise	robotsllmsaihumans	emailphone	partial · 8
repsdown.com ↗	67 match 1 shared topics	RepsDown — Free Workout Tracker for Gym-Goers and Trainers	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
theliftlab.ai ↗	67 match 1 shared topics	Hypa — Smart Fitness Tracking	en	fitness-and-exercise	robots llmsaihumans	emailphone	none
bellmade.app ↗	67 match 1 shared topics	Bellmade — Free Home Kettlebell Workout Plans & Tracker	en	fitness-and-exercise	robotsllmsaihumans	emailphone	partial · 8
fittracker.org ↗	66 match 1 shared topics	FitTracker — Training & Progress Tracking	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
fityet.app ↗	66 match 1 shared topics	FitYet - Your Personal Workout Timer & Fitness Tracker	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
ahua.studio ↗	66 match 1 shared topics	Āhua Studio \| Reformer Pilates Cambridge Interval Training	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
volm.app ↗	66 match 1 shared topics	Volm - Free Minimalist Workout Tracker	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
simply-split.com ↗	66 match 1 shared topics	Simply Split \| Workout Split Tracking App	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
djwalk.app ↗	66 match 1 shared topics	DJ Walk — Japanese Interval Walking with Your Music	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
fit36fitness.com ↗	66 match 1 shared topics	FIT36 Fitness – High‑Intensity Interval Training in 36 Minutes	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none
degreedaddy.com ↗	66 match 1 shared topics	Degree Daddy — Cold Plunge & Sauna Tracking App with Strava Sync	en	fitness-and-exercise	robots llmsaihumans	emailphone	none
moodsports.app ↗	66 match 1 shared topics	Mood Sports — The Mood Tracking App for Athletes	en	fitness-and-exercise	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.