Comparison

Primal Fast vs Winter Arc

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

Head to head
About

Primal Fast

Features
Read full description

Primal Fast — The fasting tracker built for carnivore & animal-based living. Most fasting apps treat you like everyone else. Primal Fast is different — built from the ground up for people eating carnivore, animal-based, or keto. BUILT FOR YOUR DIET Choose your eating style during setup and get a fasting plan tailored to how you actually eat — not generic advice for salads and smoothies. SIMPLE, POWERFUL FASTING TIMER Pick your protocol — 16:8, 18:6, 20:4, OMAD, or set your own custom window. Watch your progress with a live timer that tracks your fasting stages in real time, from "Fat Burning Begins" to "Deep Ketosis." STAY MOTIVATED WITH STREAKS Build daily fasting streaks, track your longest fast, and see your weekly summary at a glance. WATER TRACKING Quick-tap water logging to stay hydrated during your fasts. REAL PROGRESS, REAL DATA Log your weight, set a target, and watch your progress bar fill up. Your weekly summary shows days fasted, average duration, and total fasting hours — all calculated from your real activity. SMART REMINDERS Get notified an hour before your eating window opens, and again when your fast is complete. Reminders are optional — you're always in control. NO HIDDEN FEES Try Primal Fast free for 7 days. We show you exactly when your trial ends and when billing starts — no surprises, no fine print. Whether you're doing carnivore, animal-based, keto, or just want a fasting app that doesn't feel like it was built for someone else — Primal Fast is for you. Download now and start your primal journey. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Winter Arc

This app helps you build habits over 90 days by setting daily rules and tracking your progress. It offers flexibility with grace days and rescue options, and visualizes your journey with a heatmap and journal. Share your achievements and stay motivated with widgets and reminders.

Highlights
  • Set daily rules and sign a contract
  • Flexible streak tracking with grace days
  • 90-square heatmap progress visualization
  • Private journal with photo entries
  • Shareable progress cards
  • Home and lock screen widgets
  • Unlimited arcs with one-time upgrade
Features
Read full description

The next 90 days can change everything. Arc is the 90-day challenge tracker built for your Winter Arc. Pick a start date, write your daily rules, sign your contract — then lock in and show up every single day. No account. No subscription. Your arc lives on your phone, not on someone's server. 【WRITE YOUR RULES, SIGN YOUR CONTRACT】 Choose your daily non-negotiables — wake up early, train, read, cold showers, no doomscrolling — from templates or write your own. Then seal them with your real signature. Changing a sealed contract takes a formal amendment, and you only get three. Your word should mean something. 【A STREAK THAT DOESN'T PUNISH YOU】 Most challenge apps delete your progress the moment you slip. Arc never resets you to zero. Missed yesterday? Rescue it within 48 hours. Life happens? Grace days give you weekly breathing room. Fell off completely? Restart from Day 1 with your history preserved. The goal is finishing 90 days — not being perfect at them. 【WATCH YOURSELF CHANGE】 A 90-square heatmap fills in day by day, next to your completion ring and streak. Milestones at Day 7, 30, 60 and 90 come with real celebrations. Add photos to your private journal and let the Journey report turn your arc into a story: where you started, where you are now. 【SHARE THE PROOF】 One tap renders a clean progress card — day count, completion rate, streak — made to be shared. Let your friends know you're locked in. 【KEEP IT IN SIGHT】 Home screen and lock screen widgets keep your day count staring back at you, and a daily reminder with a stoic quote makes sure you never quietly drift. 【WHEN THE 90 DAYS END】 Your next arc is waiting. New Year Arc, Spring Arc — the ritual repeats, your past arcs stay on the shelf, and the person who finished the last one starts the next. Arc is free for the full 90 days. A single one-time upgrade unlocks unlimited grace and rescues, advanced stats, and theme packs — no subscription, ever. Your future self is watching. Lock in. 【Terms of Use (EULA)】 https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Primal Fast3 screens
Winter Arc4 screens

Verdict

The call

The clearest difference is ads: Primal Fast at none against Winter Arc's shown. Primal Fast also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, 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. Primal Fast sells 2 in-app purchases, starting at $6.99 per month and Winter Arc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 8 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
Primal Fast versus Winter Arc: the parameters behind the verdict, then further details
ParameterPrimal FastWinter Arc
PriceFreeFree
Rating—4.5 (6 ratings) — better
Positive reviews—60.0% of reviews
Number of ratings—6 — better
Update frequencyEvery 8 daysEvery 8 days
AdsNo — betterYes
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better17.0
Further details — not scored
Size43 MB14 MB
Age rating4+4+
DeveloperSERGEI JELUASVILIIkuhei Kure

In-app purchases

2 purchases

Primal Fast

Subscriptions2
  • Primal Fast Pro — Monthly$6.991 Month
  • Primal Fast Pro — Annual7 Days trial$34.991 Year
1 purchases

Winter Arc

One-time1
  • Winter Arc - Premium$9.99

Questions

Is Primal Fast free?
Primal Fast is free to download, with in-app purchases available.
Is Winter Arc free?
Winter Arc is free to download, with in-app purchases available.
Do Primal Fast or Winter Arc have ads?
Winter Arc shows ads; Primal Fast does not.
Which is updated more often, Primal Fast or Winter Arc?
Primal Fast ships an update every 8 days, and Winter Arc every 8 days. Most recently, Primal Fast was updated on October 28, 2026 and Winter Arc on October 31, 2026.

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