Comparison

FastZen vs SympTrack AI

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

Head to head
About

FastZen

This app helps you manage your intermittent fasting journey with custom schedules, progress tracking, and smart reminders. Achieve your weight loss and energy goals with a clean, intuitive interface and motivational features.

Highlights
  • Custom fasting schedules (16:8, 20:4, OMAD, up to 168 hours)
  • Progress tracking with history, streaks, and insights
  • Smart reminders for fasting start and end times
  • Achievements and milestones for motivation
  • Calendar view of completed fasts
  • Light and dark mode
  • Widgets
Read full description

Fasting made simple — and actually enjoyable. FastZen is a beautifully designed intermittent fasting tracker that helps you reach your goals with 16:8, 18:6, 20:4, OMAD and extended fasts. Whether you want to lose weight, build healthier habits or simply feel better, FastZen keeps you motivated from your first hour to your finish line. WHY YOU'LL LOVE FASTZEN • EFFORTLESS TRACKING — Start any fast in one tap. A live countdown and a smooth progress ring show exactly where you are. • LOCK SCREEN & DYNAMIC ISLAND — Follow your fast at a glance with Live Activities, without even opening the app. • APPLE HEALTH SYNC — Fasting sessions and your weight are saved to Apple Health automatically. • BODY TRACKING — Log your weight and water intake and watch your progress trend over time. • 16 PROTOCOLS + CUSTOM PLANS — From beginner-friendly 12:12 and 16:8 to 24, 48 and 72-hour fasts — or create your own schedule. • SMART REMINDERS — Get notified when your eating window opens and closes, and never miss the end of a fast. • CHALLENGES & STREAKS — Stay consistent with weekly challenges and keep your streak alive. • PROGRESS YOU CAN SEE — Weekly charts, a calendar heatmap and clear stats show how far you've come. • PRIVACY FIRST — Your fast is hidden when you switch apps, and you can export your data anytime. HOW IT WORKS 1. Answer a few quick questions so we can tailor a plan to your goals. 2. Pick your protocol — 16:8, 20:4, OMAD or fully custom. 3. Start your first fast and let FastZen handle the rest. FASTZEN PREMIUM FastZen is a subscription app. Every plan begins with a 7-day free trial, and you can cancel anytime in your App Store account settings before the trial ends. Your fasts, history and progress stay saved across all your devices via iCloud. Terms of Use: https://sites.google.com/view/mefjudevllc/terms-conditions Privacy Policy: https://sites.google.com/view/mefjudevllc/privacy-policy

About

SympTrack AI

This app allows users to privately log and monitor medication side effects. It uses AI to detect patterns and trends in your symptoms over time, helping you understand how medications are affecting you. Designed for ease of use, it offers smart reminders and organized logs.

Highlights
  • Anonymous symptom logging
  • AI-powered trend detection
  • Smart daily reminders
  • Auto-sorted symptom logs
  • Clean and fast interface
Features
Read full description

SympTrack helps users privately log and monitor medication side effects with ease. Designed for anyone starting a new prescription or managing long-term treatment, SympTrack empowers you to track how you’re feeling each day — without ever revealing your identity. With our latest update, SympTrack now includes AI-powered symptom insights that detect patterns, highlight trends, and make it easier to understand how medications are affecting you over time. Key Features: • Anonymous Symptom Tracking – No personal info required. Log what matters, securely. • AI Insights – Instantly spot trends and track how symptoms evolve. • Smart Reminders – Get a 9 AM nudge to log symptoms daily, if enabled. • Auto-Sorting Logs – Your symptoms are organized from worst to best so you can focus on what’s important. • Clean, Fast Interface – Designed for real-world use. No clutter, just clarity. Whether you’re experimenting with a new medication or managing chronic treatment, SympTrack helps you stay informed, in control, and connected to your health — your way.

Screenshots

FastZen3 screens
SympTrack AI4 screens

Verdict

The call

The clearest difference is iOS requirement: SympTrack AI at 15.6 against FastZen's 26.0. On price, rating, ratings volume and update cadence 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. FastZen sells 5 in-app purchases, starting at $1.99 per 7 days and SympTrack AI sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for FastZen against 5.0 for SympTrack AI. Both are backed by a comparable volume of ratings — 9 and 5 respectively.

UpkeepUpdate frequency

FastZen ships an update every 5 days, SympTrack AI weekly. The most recent releases landed on September 23, 2026 and September 26, 2026 respectively.

Scorecard1 real difference · 8 level
FastZen versus SympTrack AI: the parameters behind the verdict, then further details
ParameterFastZenSympTrack AI
PriceFreeFree
Rating5.0 (9 ratings)5.0 (5 ratings)
Number of ratings9 — better5
Update frequencyEvery 5 days — betterWeekly
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhoneiPhone, iPod — better
Requires iOS26.015.6 — better
Further details — not scored
Size27 MB137 MB
Age rating4+17+
DeveloperMefjuDev LLCNoah Erdahl

Customer experience

FastZen

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

SympTrack AI

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

5 purchases

FastZen

Subscriptions4
  • Weekly3 Days trial$1.997 Days
  • Monthly$2.991 Month
  • 3 Months$7.993 Months
Show 1 more
  • Yearly$19.991 Year
One-time1
  • Lifetime$39.99
2 purchases

SympTrack AI

Subscriptions2
  • SympTrack AI Premium$2.991 Month
  • SympTrack AI Premium$29.991 Year

Questions

Is FastZen free?
FastZen is free to download, with in-app purchases available.
Is SympTrack AI free?
SympTrack AI is free to download, with in-app purchases available.
Which has better reviews, FastZen or SympTrack AI?
FastZen and SympTrack AI are both rated 5.0 out of 5 on the App Store, from 9 and 5 ratings respectively.
Do FastZen or SympTrack AI have ads?
Neither FastZen nor SympTrack AI shows ads.
Which is updated more often, FastZen or SympTrack AI?
FastZen ships an update every 5 days, and SympTrack AI weekly. Most recently, FastZen was updated on September 23, 2026 and SympTrack AI on September 26, 2026.

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