Comparison

Rivalists vs Day Zero

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Rivalists

This app helps athletes and active individuals optimize their health and performance by syncing data from wearables and health apps. It facilitates real-time connection with physical therapists, coaches, or trainers for personalized care and progress monitoring.

Highlights
  • Sync health data from 100+ sources
  • Message with PT, Coach, or Trainer
  • Access assigned workouts
  • Track activity, sleep, and recovery
  • Share key metrics securely with providers
Read full description

Rivalists™ mobile is designed for athletes and active individuals looking to optimize their health and performance. Our app seamlessly syncs data from your favorite wearables and health apps, making it easy to monitor progress and connect with your Physical Therapist, Coach, or Trainer in real-time. With powerful workout and recovery tracking tools, Rivalists™ empowers your support team to deliver truly personalized care, helping you stay active, healthy, and ahead of your goals. Not using a PT or Trainer? Invite them to join and take your health to the next level. We're continuously improving the platform, with new features and updates shaped by feedback from users like you. Your input is key to helping us build the future of proactive, personalized health. Key Features: - Sync health data from over 100+ sources - Message with your PT, Coach, or Trainer - Access assigned workouts - Track metrics like activity, sleep, and recovery - Securely share key metrics with a provider Join the Rivalists™ community and take control of your active life.

About

Day Zero

Features
Read full description

One number per habit: how many days since you last showed up. Keep it at zero. That’s the whole game. Day Zero is accountability without the noise — no streak anxiety, no social feeds, no accounts. Just a big honest number that goes green when you show up and red when you don’t, on your Home Screen where you can’t ignore it. THE RITUAL Open to Today: what’s owed, what’s done, one tap to settle up. Every habit gets its own board — the number, the week’s dots, and a line of copy with actual personality. DAILY OR SCHEDULED Run flexible targets (4× a week) or pin specific weekdays. Planned rest days get calm recovery copy instead of guilt — and if your weekly goal is mathematically at risk, the card says so out loud. GOLD WEEKS Hit your weekly target and everything turns gold. Win EVERY habit’s week and you’ve earned a Perfect Week — with a shareable gold poster. Sharing is earned here, not ambient. WIDGETS THAT WORK Log with one tap from the Home Screen or Lock Screen. A single-habit widget in every size, plus an all-habits overview that goes gold on perfect weeks. LIFE HAPPENS Pause any habit: the number stays honest, the guilt switches off, and a gentle check-in asks when you’re ready. Logging anything brings you back instantly. A VOICE, NOT A DASHBOARD Hundreds of hand-written lines that rotate daily and never repeat until the pool runs dry. Optionally, let on-device Apple Intelligence write fresh lines from your real context — your gap, your week, your goal. Tap any card to flip it: your “why” waits on the back in a gold frame. PRIVATE BY ARCHITECTURE No accounts. No analytics. No servers. Everything lives on your phone. Habits: running, reading, meditation, stretching, strength, swimming, cycling, rowing — or build your own with an 84-icon library.

Screenshots

Rivalists4 screens
Day Zero4 screens

Verdict

The call

The clearest difference is iOS requirement: Rivalists at 16.0 against Day Zero's 18.0. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Scorecard1 real difference · 8 level
Rivalists versus Day Zero: the parameters behind the verdict, then further details
ParameterRivalistsDay Zero
PriceFreeFree
Rating4.8 (5 ratings) — better—
Number of ratings5 — better—
Update frequencyFortnightly—
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better18.0
Further details — not scored
Size82 MB3 MB
Age rating12+4+
DeveloperAthleticus IncQuentin Perrot

In-app purchases

None

Rivalists

No in-app purchases

None

Day Zero

No in-app purchases

Questions

Is Rivalists free?
Rivalists is free to download, with no in-app purchases.
Is Day Zero free?
Day Zero is free to download, with no in-app purchases.
Do Rivalists or Day Zero have ads?
Neither Rivalists nor Day Zero shows ads.

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