# FLIP vs Sum

The clearest difference is ads: Sum at none against FLIP's shown. Sum also leads on rating (5.0 vs 4.5) and review sentiment (100% vs 88%). FLIP's advantage is ratings volume (897 vs 2) and device support (3 vs 1). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. FLIP sells 10 in-app purchases, starting at $2.00 per month and Sum sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Sum holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: FLIP has 897 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 88% of FLIP's written reviews are positive against 100% of Sum's.

FLIP ships an update every 2 weeks, Sum every 3 weeks. The most recent releases landed on November 6, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | FLIP | Sum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (897 ratings)](https://appshunter.io/ios/app/flip-focus-timer-for-study/id1435127190/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821/reviews)** |
| Number of ratings | **897** | 2 |
| Positive reviews | 87.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 145 MB | 3 MB |
| Requires iOS | **15.6** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Rinasoft Inc.](https://appshunter.io/developer/386505937) | [Nene Nakagawa](https://appshunter.io/developer/1821103094) |

## What reviewers say

### FLIP

[App page](https://appshunter.io/ios/app/flip-focus-timer-for-study/id1435127190)

This app helps improve study habits by tracking focus time using a unique phone-flipping method. It offers features like global study groups, real-time progress monitoring, and detailed statistics to enhance concentration and productivity.

**Highlights:** Flip phone to measure study time, Global study groups and chat, Real-time study session monitoring, Detailed daily, weekly, monthly statistics, D-day countdown for goals, Timetable and study schedule planner

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Membership | $2.00 | per month |
| 6 Months Premium Membership | $10.00 | per 6 months |
| Yearly Premium Membership | $18.00 | per year |
| Premium Service - 1Month | $1.99 | one-time |
| Charging 2500 points | $1.99 | one-time |
| Premium Service - 3Months | $4.99 | one-time |
| Charging 5900 points | $4.99 | one-time |
| Premium Service - 6 Months | $7.99 | one-time |
| Premium Service - 12 Months | $14.99 | one-time |
| Charging 20000 points | $15.99 | one-time |

**What reviewers like**

- 💕 Motivating and helpful for studying
- 👍 Cute and aesthetically pleasing design
- 🚀 Useful features like goals, timers, and tracking
- 🤝 Social aspect with study groups and leaderboards

**What reviewers complain about**

- 🐛 Occasional crashes and glitches
- 🔒 Concerns about premium features and in-app purchases
- 📱 Issues with syncing and editing data across devices

**Reported bugs**

- Ranking and leaderboard data not updating properly
- Study time not being saved or recorded accurately
- Language settings not working as expected

**Requested features**

- Add more customization options for themes and layouts
- Improve the user interface and navigation
- Implement an Apple Watch app for easier tracking
- Allow more flexibility in setting and editing study goals


### Sum

[App page](https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821)

Track and manage your study time by subject with a simple timer. Log sessions, add notes, and visualize your progress with weekly graphs and a calendar. Focus on learning without distractions.

**Highlights:** Study time tracking, Subject and material logging, Weekly progress graphs, Calendar visualization, Study streaks, Pomodoro timer

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stackd Pro | $1.99 | one-time |


## Frequently asked questions

### Is FLIP free?

FLIP is free to download, with in-app purchases available.

### Is Sum free?

Sum is free to download, with in-app purchases available.

### Which has better reviews, FLIP or Sum?

Sum is rated higher. FLIP averages 4.5 out of 5 from 897 ratings, while Sum averages 5.0 from 2 ratings.

### Do FLIP or Sum have ads?

FLIP shows ads; Sum does not.

### Which is updated more often, FLIP or Sum?

FLIP ships an update every 2 weeks, and Sum every 3 weeks. Most recently, FLIP was updated on November 6, 2026 and Sum on November 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*