Comparison

Oasis vs Fastology

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

Head to head
About

Oasis

Features
Read full description

Professional hydration management powered by artificial intelligence. Machine learning algorithms analyze your hydration patterns, lifestyle, and physiological data. Receive evidence-based recommendations calibrated to your individual profile. Scientifically designed protocols help establish sustainable hydration habits. Track consistency through objective metrics. Data visualization provides insights into consumption patterns. Monitor daily, weekly, and monthly trends. Analyze beverage composition and timing distribution. Personalized advice based on physiological parameters. Optimal hydration schedules aligned with your circadian rhythm and activity patterns. Adaptive notifications at optimal times based on your behavioral patterns. Customize frequency and timing. Track measurable improvements in hydration compliance. Set goals based on WHO guidelines. Monitor long-term trends. Professional-grade hydration management committed to optimal health.

About

Fastology

This app provides structured tracking for intermittent fasting, going beyond simple timers. It helps users follow specific fasting schedules with clear phase progress, build consistency through streaks, and manage a flexible weekly plan. Focuses on discipline and reducing guesswork for a clearer fasting experience.

Highlights
  • Track various fast types (16:8, OMAD, extended)
  • Live phase-by-phase progress tracking
  • Build streaks from completed fasts
  • Flexible weekly fasting schedule
  • Review fasting history
  • Ask fasting questions with reviewed answers
  • Siri and Shortcuts integration
Features
Read full description

Fastology is a fasting tracker for people who want more than a timer. Fasting works when it is structured. Fastology helps you track 16:8, 18:6, OMAD, and extended fasts with clear phase progress, streaks that reflect completed fasts, and a weekly schedule that fits real life. Most fasting apps count hours. Fastology helps you follow through. WHY FASTOLOGY Structured, not reactive Follow a clear fasting rhythm instead of making it up as you go. See where you are Track each phase of the fast with live progress, so you always know where you stand and what comes next. Consistency over intensity Build streaks from completed fasts and focus on repeatability, not random extremes. Flexible weekly schedule Set your fasting rhythm for the week, then adjust specific days when life changes. Clear, focused experience No clutter. No noise. Just the tools that matter when you want to fast with more discipline and less guesswork. WHAT YOU CAN DO • Track 16:8, 18:6, OMAD, and extended fasts • Follow live phase-by-phase progress • Build streaks from completed fasts • Set a weekly schedule and adjust specific days • Review your fasting history over time • Ask fasting questions with reviewed answers and linked sources • Start a fast, check your phase, or search Fastology from Siri, Spotlight, Shortcuts, and Ask • On supported devices, use Apple Intelligence to explore your fasting history Fastology is built for people who want to fast with more clarity, more structure, and more follow-through.

Screenshots

Oasis4 screens
Fastology4 screens

Verdict

The call

Oasis and Fastology are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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.

ScorecardNo meaningful differences
Oasis versus Fastology: the parameters behind the verdict, then further details
ParameterOasisFastology
PriceFreeFree
Rating—4.8 (5 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—5 — better
Update frequency—Fortnightly
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS16.0 — better17.0
Further details — not scored
Size43 MB40 MB
Age rating12+4+
DeveloperAndrei PitunouSmallScale Works LLC

In-app purchases

None

Oasis

No in-app purchases

None

Fastology

No in-app purchases

Questions

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

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