I/O Frog vs ChartDay
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
I/O Frog
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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.
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.
- 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
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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
Verdict
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
Both are free to download. ChartDay sells 1 one-off in-app purchase. I/O Frog asks for nothing beyond the download.
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.
| Parameter | I/O Frog | ChartDay |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 16.2 — better |
| Further details — not scored | ||
| Size | 126 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Sigfrog s.r.o. | Fu Ni |
In-app purchases
I/O Frog
No in-app purchases
ChartDay
- ChartDay Unlimited$1.99









