Comparison

I/O Frog vs ChartDay

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

Head to head
About

I/O Frog

Features
Read full description

IOFrog brings essential operational visibility to your iPhone. Use iofrog to view key dashboard cards optimized for mobile, track important device and operational status at a glance, receive push notifications for critical events, built for fast daily use, IOFrog helps teams stay informed, react sooner, and keep operations under control wherever they are. Note: IOFrog requires an existing account and backend environment configured by your organization.

About

ChartDay

Track daily habits, health, and fitness with interactive charts. Offers instant statistics, goal setting, and data export. Syncs across devices and provides home screen widgets for quick access.

Highlights
  • Daily tracking with interactive charts
  • Instant statistical calculations
  • Goal setting with target lines
  • Tagging and filtering for organization
  • Home screen widgets
  • iCloud sync across devices
  • Data export to CSV
Features
Read full description

Track your daily habits, health, fitness, and more — visualized in beautiful, interactive charts. ◉ Key Features ・Daily Tracking Made Simple  Enter a number each day and watch your progress unfold as a chart.  View trends by week or month at a glance. ・Instant Stats  Automatic calculations for sum, count, min, max, mean, and median — always up to date. ・Set Goals & Stay Motivated  Add a target line or range directly on your chart to keep your objectives in sight. ・Tags & Filtering  Organize entries with custom tags and filter your chart by any combination. ・Home Screen Widgets  Check your latest data without opening the app.  Tap the widget to jump straight to data entry. ・iCloud Sync  Your charts stay safe and in sync across all your devices. ・Multi-Entry Mode  Record multiple data points per day with timestamps on a single chart.  Ideal for tracking walks, meals, workouts, or anything that happens more than once a day. ・Data Export  Export any chart as a CSV file whenever you need it. ・Private & Ad-Free  No ads, no tracking, no data collection. Your data belongs to you. ◉ ChartDay Unlimited (In-App Purchase) Unlock unlimited chart creation with a one-time purchase. Try it free first — add up to 100 data points before deciding.

Screenshots

I/O Frog4 screens
ChartDay4 screens

Verdict

The call

The clearest difference is in-app purchases: I/O Frog at none against ChartDay's 1. ChartDay's advantage is update cadence (every 3 weeks vs every 2 months) and iOS requirement (16.2 vs 18.0). On price, ads 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. ChartDay sells 1 one-off in-app purchase. I/O Frog asks for nothing beyond the download.

UpkeepUpdate frequency

I/O Frog ships an update every 2 months, ChartDay every 3 weeks. The most recent releases landed on September 15, 2026 and June 1, 2026 respectively.

Scorecard3 real differences · 7 level
I/O Frog versus ChartDay: the parameters behind the verdict, then further details
ParameterI/O FrogChartDay
PriceFreeFree
Rating—5.0 (3 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.016.2 — better
Further details — not scored
Size126 MB2 MB
Age rating4+4+
DeveloperSigfrog s.r.o.Fu Ni

In-app purchases

None

I/O Frog

No in-app purchases

1 purchases

ChartDay

One-time1
  • ChartDay Unlimited$1.99

Questions

Is I/O Frog free?
I/O Frog is free to download, with no in-app purchases.
Is ChartDay free?
ChartDay is free to download, with in-app purchases available.
Do I/O Frog or ChartDay have ads?
Neither I/O Frog nor ChartDay shows ads.
Which is updated more often, I/O Frog or ChartDay?
I/O Frog ships an update every 2 months, and ChartDay every 3 weeks. Most recently, I/O Frog was updated on September 15, 2026 and ChartDay on June 1, 2026.

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