Progress vs IOU Slip
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Progress
Easily track your progress and countdown to important dates. Set custom periods and visualize remaining days at a glance. Utilize home screen widgets for quick access to your progress updates.
- Set custom periods
- Display days remaining
- Home screen widgets
- Progress visualization
- Countdown timer
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【Check your progress !! 】 Progress is a simple application with only one function. You can display the current progress and the number of days remaining by setting the period. 【Check at a glance from the home screen】 You can also set Widget, which is a new feature from iOS14. This allows you to easily check your progress from the home screen.
IOU Slip
This app helps you record personal promises and favors, focusing on relationships and trust rather than monetary debt. It serves as a digital reminder of bonds between people, like offering a massage or a future coffee. It's designed to cherish connections and the spirit of giving.
- Record personal promises
- Track favors and bonds
- Digital note of promises
- Focus on relationships
- Reminder of trust
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IOU Slip Keep the promise. Record bonds, not debt. In modern life, everything is settled with money. But real relationships are not meant to be cleared. IOU Slip is a lightweight app to record promises, favors, and unspoken bonds between people — not as money, but as memory. What is an IOU Slip? An IOU Slip is a digital note of a promise: • “I owe you a massage.” • “Next coffee is on me.” • “I’ll help you anytime.” It’s not a debt. It’s a reminder of trust.
Screenshots
Verdict
The clearest difference is price: IOU Slip at Free against Progress's $3.99. IOU Slip also leads on rating (5.0 vs 4.0) and review sentiment (100% vs 83%). Progress's advantage is ratings volume (30 vs 2). On update cadence, ads, in-app purchases and monetization model 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
IOU Slip is free to download; Progress costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
IOU Slip holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Progress has 30 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 83% of Progress's written reviews are positive against 100% of IOU Slip's.
Progress ships an update every 2 days, IOU Slip every 4 days. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.
| Parameter | Progress | IOU Slip |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.0 (30 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 83.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 30 — better | 2 |
| Update frequency | Every 2 days — better | Every 4 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone |
| Requires iOS | 26.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 5 MB | 4 MB |
| Age rating | 4+ | 17+ |
| Developer | Gaku Sakai | GROUPOO PTE. LTD. |
Customer experience
Progress
IOU Slip
In-app purchases
Progress
No in-app purchases
IOU Slip
No in-app purchases
