Comparison

Fast.io vs TrueFast

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

Head to head
About

Fast.io

Features
Read full description

Fast.io is a beautifully simple intermittent fasting timer designed to help you stay consistent and focused on your fasting goals. Track your fast in real time, monitor hydration, and stay motivated with clear insights, widgets, and Live Activities. Perfect for popular fasting schedules like **16:8, 18:6, or OMAD**. #### TRACK YOUR FAST • Start fasting sessions with presets like 16:8, 18:6, or create custom fasting intervals • See elapsed time, remaining time, and fasting phases\ • Follow your fasting progress in real time #### TRACK YOUR WEIGHT • Sync weight with Apple Health • Monitor weight changes during fasting • Understand how fasting affects your body #### STAY CONSISTENT • Local reminders for fasting milestones • Daily hydration tracking • Motivation through achievements and streaks #### SEE YOUR PROGRESS • History with notes and mood tracking • Weekly, monthly, and yearly statistics • Understand and improve your fasting habits #### BUILT FOR APPLE DEVICES • Live Activities and Dynamic Island • Home Screen and Lock Screen widgets • Apple Watch companion app #### PRO FEATURES • One‑time purchase (no subscription) • Advanced customization • Extended fasting history Fast.io is designed to make intermittent fasting simple, beautiful, and effective.

About

TrueFast

Track your intermittent fasting journey with a clean, ad-free interface. Monitor your progress, set personalized goals, and access educational content. Offers seamless integration with Apple Watch and Lock Screen widgets for easy access.

Highlights
  • Fasting timer with elapsed and remaining time
  • Saved goals for common fasting plans
  • Schedules and reminders
  • History calendar, streaks, and badges
  • Lock Screen widgets and Apple Watch support
  • Fasting phase education
  • Local-first data storage
Features
Read full description

TrueFast is a simple intermittent fasting tracker built to stay out of your way. Start a fast, follow your saved goal, check your progress from your iPhone or Apple Watch, and review your fasting history without ads, social features, or clutter. Core features are free: • Fasting timer with elapsed and remaining time • Saved goals for common fasting plans • Schedules and reminders • History calendar, streaks, and badges • Lock Screen widgets, Home Screen widgets, Live Activities, and Apple Watch support • Fasting phase education with clear wellness context • Local-first data storage TrueFast Pro adds optional power-user tools: • iCloud sync across devices • Weight tracking with Apple Health • Advanced charts • CSV export • Custom themes and app icons • All future Pro features TrueFast is intended for adults. Fasting may not be appropriate for children, teens, pregnant or breastfeeding people, people with a history of eating disorders, or people with certain medical conditions. Consult a qualified healthcare professional before fasting. TrueFast does not provide medical advice, diagnosis, or treatment. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula Privacy Policy: https://gettruefast.com/privacy-policy

Screenshots

Fast.io4 screens
TrueFast4 screens

Verdict

The call

The clearest difference is update cadence: TrueFast at every 6 days against Fast.io's monthly. TrueFast also leads on iOS requirement (18.0 vs 26.0). 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. Fast.io sells 1 one-off in-app purchase and TrueFast sells 6 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Fast.io ships an update monthly, TrueFast every 6 days. The most recent releases landed on September 21, 2026 and September 15, 2026 respectively.

Scorecard2 real differences · 7 level
Fast.io versus TrueFast: the parameters behind the verdict, then further details
ParameterFast.ioTrueFast
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyMonthlyEvery 6 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, Apple WatchiPhone, iPad, Apple Watch — better
Requires iOS26.018.0 — better
Further details — not scored
Size23 MB6 MB
Age rating4+17+
DeveloperStefan SturmEvan Mattson

In-app purchases

1 purchases

Fast.io

One-time1
  • Fast.io Pro$6.99
6 purchases

TrueFast

Subscriptions2
  • TrueFast Pro Monthly$2.991 Month
  • TrueFast Pro Yearly$19.991 Year
One-time4
  • Buy Us a Coffee$1.99
  • Power the Fast$4.99
  • Super Supporter$9.99
Show 1 more
  • TrueFast Pro (Lifetime)$29.99

Questions

Is Fast.io free?
Fast.io is free to download, with in-app purchases available.
Is TrueFast free?
TrueFast is free to download, with in-app purchases available.
Do Fast.io or TrueFast have ads?
Neither Fast.io nor TrueFast shows ads.
Which is updated more often, Fast.io or TrueFast?
Fast.io ships an update monthly, and TrueFast every 6 days. Most recently, Fast.io was updated on September 21, 2026 and TrueFast on September 15, 2026.

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