Comparison

16/8 vs Onefast

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

Head to head
About

16/8

This app simplifies intermittent fasting with a 16:8 schedule and integrates hydration tracking to enhance your fasting experience. It helps you build a consistent daily routine for better focus and sustained fasting.

Highlights
  • One-tap 16:8 fasting start
  • Instant fasting status display
  • Water intake logging
  • Daily routine consistency
  • Hydration benefits during fasting
Features
Read full description

16/8 Fasting & Water Tracker makes intermittent fasting simple—and pairs it with hydration so you feel better while you do it. Some features require a subscription. Fasting works best when you’re hydrated. A 16:8 fasting schedule supports your routine, and consistent water intake can help curb cravings and support focus. Together, they make fasting easier to sustain and more effective over time. What you can do with 16/8: Start a 16:8 fast in one tap: No complex setup, just start. See your status instantly: Know exactly when you can eat and when you’re fasting. Track water intake: Log your hydration alongside your fasting window. Stay consistent: Build a simple daily routine you’ll actually follow. Why the combo matters: The 16:8 fast helps create structure, and hydration helps you feel better during your fasting window—less distracted, more steady, and more likely to stick with it. Whether you’re new to fasting or already doing 16:8, this app helps you stay on track without overthinking it. -- Subscription Details: Some features require a subscription after the free trial, including unlimited fasting tracking and water reminders. Free users can explore the app, but continued access to premium features requires a monthly or yearly subscription. ---- Important links Privacy Policy: https://pughealth.app/privacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Onefast

Read full description

A fasting timer that does one thing well. Pick a plan, tap Start, and Onefast counts. The time left is on your lock screen and in the Dynamic Island, so you never open the app just to look. When the goal is reached it tells you once, then keeps counting, up to seven days. ONE TAP No sign-up, no questions, no tour. The first screen is the plan picker with 16:8 already selected; the second is the timer. That is the whole setup. ALWAYS RIGHT The timer is a clock, not a counter. Force-quit the app, restart the phone, change time zone — it comes back showing the true elapsed time, to the second. The widget, the Live Activity and the app all read the same moment. YOURS TO EDIT Forgot to tap End? Fix the time afterwards. Add a fast you did last week. Overlaps are named in words, not blocked silently. Fasts longer than 24 hours are allowed — Onefast asks once whether you meant it, then never again. QUIET WHEN YOU WANT Three switches: Live Activity with Dynamic Island, the lock screen widget, and the home screen widget. Notifications turn on and off one kind at a time, and the mid-fast ones start off. PLANS 12:12, 14:10, 16:8, 18:6, 20:4 and one meal a day are built in. Up to five named custom plans and a weekly schedule with Pro. NO ADS. EVER. Not on the free tier, not after you buy. Onefast has no server, no account and no analytics. Your history lives on your iPhone and, if you turn it on, in your own private iCloud. ONEFAST PRO Unlimited history (free keeps the last 30 days), 30-day and all-time stats with charts, month and year summaries, insights from your own record, milestones you can share, a weekly schedule with rest days, up to five named custom plans, two-way weight sync with Apple Health, a weight goal line on your chart, ten ring colours and app icons or a colour of your own, a medium calendar widget, and CSV export. Two prices, one name: a yearly subscription that auto-renews until cancelled, or a single lifetime purchase. No trial. The price is on screen before you tap anything. Everything that makes the timer usable — lock screen, notifications, backup, editing — stays free with or without Pro. Onefast is a timer. It gives no medical or dietary advice; talk to a professional before changing how you eat. Available in English, 日本語, 한국어, 繁體中文, Italiano, Nederlands, Deutsch, Français, Español, Português (Brasil), العربية, Türkçe and Tiếng Việt. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://primetruthteam.github.io/onefast/privacy/

Screenshots

16/83 screens
Onefast4 screens

Verdict

The call

The clearest difference is update cadence: Onefast at every 2 days against 16/8's every 8 days. 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. 16/8 sells 2 in-app purchases, starting at $1.99 per month and Onefast sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

16/8 ships an update every 8 days, Onefast every 2 days. The most recent releases landed on October 23, 2026 and October 4, 2026 respectively.

Scorecard1 real difference · 9 level
16/8 versus Onefast: the parameters behind the verdict, then further details
Parameter16/8Onefast
PriceFreeFree
Rating5.0 (8 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings8 — better—
Update frequencyEvery 8 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhoneiPhone
Requires iOS17.017.0
Further details — not scored
Size52 MB4 MB
Age rating4+4+
DeveloperPug Health LLCNguyen Dinh Chung

In-app purchases

2 purchases

16/8

Subscriptions2
  • Monthly Plan3 Days trial$1.991 Month
  • Yearly Plan3 Days trial$19.991 Year
2 purchases

Onefast

Subscriptions1
  • Onefast Pro (Yearly)$9.991 Year
One-time1
  • Onefast Pro (Lifetime)$19.99

Questions

Is 16/8 free?
16/8 is free to download, with in-app purchases available.
Is Onefast free?
Onefast is free to download, with in-app purchases available.
Do 16/8 or Onefast have ads?
Neither 16/8 nor Onefast shows ads.
Which is updated more often, 16/8 or Onefast?
16/8 ships an update every 8 days, and Onefast every 2 days. Most recently, 16/8 was updated on October 23, 2026 and Onefast on October 4, 2026.

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