# Key tail vs SumOne

The clearest difference is in-app purchases: Key tail at none against SumOne's 17. Key tail also leads on ads (none vs shown) and iOS requirement (12.0 vs 16.0). SumOne's advantage is update cadence (weekly vs every 38 months). On price and device support there is nothing between them.

Both are free to download. SumOne sells 17 in-app purchases, starting at $2.99 per month. Key tail asks for nothing beyond the download.

Key tail ships an update every 38 months, SumOne weekly. The most recent releases landed on September 23, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Key tail | SumOne |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (19K ratings)](https://appshunter.io/ios/app/sumone-for-relationships/id1469506430/reviews)** |
| Number of ratings | — | **19K** |
| Positive reviews | — | 74.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 38 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 16 MB | 284 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [KOJI HIDAKA](https://appshunter.io/developer/1460780996) | [sandfox](https://appshunter.io/developer/376618320) |

## What reviewers say

### Key tail

[App page](https://appshunter.io/ios/app/key-tail/id1460780997)

**In-app purchases:** none


### SumOne

[App page](https://appshunter.io/ios/app/sumone-for-relationships/id1469506430)

Deepen your connection with your partner through daily questions and shared experiences. Discover new insights about each other, nurture a virtual companion, and personalize your shared digital space. Track important dates and express your feelings to strengthen your bond.

**Highlights:** Daily discovery questions, Virtual companion growth (EggMon), Customizable virtual room, Send cute notes (Memos), Anniversary tracker, Emotion tracking, Home screen widgets

**In-app purchases (17)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription (Beta) | $2.99 | per month |
| Monthly subscription | $5.99 | per month |
| Monthly subscription | $6.99 | per month |
| Annual subscription | $29.99 | per year |
| Annual subscription | $29.99 | per year |
| Annual subscription | $79.99 | per year |
| Gem - 2500 | $1.99 | one-time |
| Gem - 5500 | $2.99 | one-time |
| New User Gem - 5500 | $3.99 | one-time |
| Gem - 9900 | $5.99 | one-time |
| Event Gem - 12900 | $7.99 | one-time |
| 썸원골드(얼리버드) | $11.99 | one-time |
| Gem - 19000 | $11.99 | one-time |
| 썸원골드 | $12.99 | one-time |
| 썸원골드(얼리버드) | $12.99 | one-time |
| 썸원골드 | $14.99 | one-time |
| 썸원골드 | $19.99 | one-time |

**What reviewers like**

- ❤️ Lovely app
- 🎨 Cute and adorable
- 💬 Helps strengthen relationships
- 📚 Interesting questions
- 🤝 Promotes communication between partners

**What reviewers complain about**

- 💰 Expensive in-app purchases
- 🐛 Frequent crashes and bugs
- 🤖 Repetitive and generic questions
- 🔒 Locked features and limited customization
- 🧭 Difficulty earning in-game currency

**Reported bugs**

- App crashes on launch
- Pebbles (in-game currency) disappearing
- Inability to open app on certain networks
- Syncing issues between partners
- Notification and timer problems

**Requested features**

- Add autocorrect feature
- Increase character limit for responses
- Introduce more ways to earn in-game currency
- Add mini-games or activities for couples
- Provide a web/desktop version of the app


## Frequently asked questions

### Is Key tail free?

Key tail is free to download, with no in-app purchases.

### Is SumOne free?

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

### Do Key tail or SumOne have ads?

SumOne shows ads; Key tail does not.

### Which is updated more often, Key tail or SumOne?

Key tail ships an update every 38 months, and SumOne weekly. Most recently, Key tail was updated on September 23, 2026 and SumOne on September 30, 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.*