# FLIP vs Stackd

The clearest difference is ads: Stackd at none against FLIP's shown. FLIP's advantage is iOS requirement (15.6 vs 18). On price, update cadence, in-app purchases and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on September 29, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | FLIP | Stackd |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (896 ratings)](https://appshunter.io/ios/app/flip-focus-timer-for-study/id1435127190/reviews)** | — |
| Number of ratings | **896** | — |
| Positive reviews | 87.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Freemium | — |
| Size | 146 MB | 3 MB |
| Requires iOS | **15.6** | 18 |
| Devices | **iPhone, 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 accurately measuring focus time. It offers features like global study groups, real-time study tracking, and detailed statistics to enhance concentration and productivity.

**Highlights:** Accurate time measurement by flipping phone, Focus level measurement, Global study groups (FLIP ZONE), Real-time study tracking (LIVE), Study time statistics and reports, D-day countdown for goals

**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


### Stackd

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

**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 Stackd free?

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

### Do FLIP or Stackd have ads?

FLIP shows ads; Stackd does not.

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

FLIP ships an update fortnightly, and Stackd fortnightly. Most recently, FLIP was updated on September 29, 2026 and Stackd on September 14, 2026.

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