Comparison

Outflow Diary vs Pee

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

Head to head
About

Outflow Diary

Features
Read full description

Free, simple, and ad-free app for tracking your liquid intake and discharges.

About

Pee

This app helps you build strength and stay hydrated by integrating simple exercises with your natural bathroom breaks. It uses habit stacking and frequent, low-intensity practice to build muscle without dedicated gym time.

Highlights
  • Log exercises with one tap
  • Track hydration and workout data
  • Competitive leaderboards
  • Apple Health integration
  • iOS widget and watchOS support
  • Habit stacking method
Features
Read full description

Drink water. Pee. Do push-ups. Welcome to Pee-ups! Fitness doesn't have to mean hours at the gym. It's built on small, consistent habits — repeated often enough that they stick. Did you know the average person pees 6 to 8 times a day? Commit to just 10 push-ups every time you take a trip to the bathroom and you'll naturally complete 60 to 80 push-ups a day. That's over 2,000 push-ups a month, almost entirely without dedicated workout sessions. THE METHOD Pee-ups is built on two proven ideas: • Habit stacking (from Atomic Habits): the easiest way to build a new habit is to attach it to something you already do automatically. Your natural hydration cycle becomes the trigger for a quick set. • Greasing the groove (popularized by strength coach Pavel Tsatsouline): strength is a skill you build through frequent, sub-maximal practice spread across the day — never training to failure. Because your bathroom breaks are naturally spaced out, Pee-ups greases the groove for you, turning dozens of easy, fresh sets into real strength without burnout. FEATURES • Log in 1 Tap: Quickly record completed sets or queue them to complete later if you're in a public bathroom. • Track Hydration & Workouts: See custom charts matching your fluid intake to your exercise repetitions. • Competitive Leaderboards: Join global or private groups to stack up reps against friends and see who stays the most hydrated. • Apple Health Integration: Natively logs your functional strength training workouts and water intake (in US fluid ounces) directly to Apple Health. • iOS Widget & watchOS Support: View your stats and log reps instantly from your Home Screen widgets or directly from your Apple Watch. Stop setting massive goals that fall apart. Capitalize on your body's natural daily cycle. Hydrate, stay active, and conquer your goals with Pee-ups. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Outflow Diary4 screens
Pee4 screens

Verdict

The call

The clearest difference is in-app purchases: Outflow Diary at none against Pee's 2. Pee's advantage is update cadence (every 2 days vs every 6 months). On price, ads, device support and iOS requirement 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. Pee sells 2 in-app purchases, starting at $0.99 per month. Outflow Diary asks for nothing beyond the download.

UpkeepUpdate frequency

Outflow Diary ships an update every 6 months, Pee every 2 days. The most recent releases landed on September 11, 2026 and September 14, 2026 respectively.

Scorecard2 real differences · 8 level
Outflow Diary versus Pee: the parameters behind the verdict, then further details
ParameterOutflow DiaryPee
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 6 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS18.0 — better18.6
Further details — not scored
Size6 MB48 MB
Age rating4+9+
DeveloperFlyOver Solutions, LLCHoverstone LLC

In-app purchases

None

Outflow Diary

No in-app purchases

2 purchases

Pee

Subscriptions2
  • Premium Monthly$0.991 Month
  • Premium Yearly7 Days trial$4.991 Year

Questions

Is Outflow Diary free?
Outflow Diary is free to download, with no in-app purchases.
Is Pee free?
Pee is free to download, with in-app purchases available.
Do Outflow Diary or Pee have ads?
Neither Outflow Diary nor Pee shows ads.
Which is updated more often, Outflow Diary or Pee?
Outflow Diary ships an update every 6 months, and Pee every 2 days. Most recently, Outflow Diary was updated on September 11, 2026 and Pee on September 14, 2026.

Other comparisons