# Serendipity Labs vs Duckbill

The clearest difference is update cadence: Duckbill at weekly against Serendipity Labs's every 3 months. Duckbill also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Serendipity Labs ships an update every 3 months, Duckbill weekly. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Serendipity Labs | Duckbill |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (70 ratings)](https://appshunter.io/ios/app/duckbill/id6455085338/reviews)** |
| Number of ratings | — | **70** |
| Positive reviews | — | 74.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | — | Ad-supported |
| Size | 27 MB | 116 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Serendipity Labs, Inc.](https://appshunter.io/developer/1552871569) | [Duckbill Technologies, Inc.](https://appshunter.io/developer/1699836267) |

## What reviewers say

### Serendipity Labs

[App page](https://appshunter.io/ios/app/serendipity-labs-us/id1552871567)

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

**In-app purchases:** none


### Duckbill

[App page](https://appshunter.io/ios/app/duckbill/id6455085338)

This app offers human-led, AI-enhanced personal assistance for everyday tasks and life administration. It handles everything from prescription refills and appointment booking to travel arrangements and bill management, freeing up your time.

**Highlights:** Human-led AI-enhanced assistance, Task execution for daily chores, Life administration management, Prescription refill coordination, Birthday card and gift sending, Passport renewal services, Travel booking and coordination, Grocery delivery setup

**Features:** Apple Wallet, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- ✨ Saves significant time
- 🤝 Acts as a helpful partner
- 💯 Efficient task completion
- 💡 Great for ADHD/organization
- 💖 Humans care about users

**What reviewers complain about**

- 📉 Task completion inconsistent
- 💸 Misleading completion rates advertised
- 💰 Frequent requests for extra payment
- 💳 Auto-deducted money without permission
- 💸 Expensive for the value

**Reported bugs**

- No way to resolve billing issues on mobile
- Service went down due to billing issue with no quick fix
- Login screen freezes (inferred from billing issue)
- Incompatible with older devices (inferred from general app issues)
- Home screen features gone

**Requested features**

- Ensure tasks are completed within scope
- Humans can't get paid until task is marked complete by user with 5 stars
- Flat, predictable pricing plan instead of credits
- Bring back unique and useful app features
- Automate more features with agents


## Frequently asked questions

### Is Serendipity Labs free?

Serendipity Labs is free to download, with no in-app purchases.

### Is Duckbill free?

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

### Do Serendipity Labs or Duckbill have ads?

Neither Serendipity Labs nor Duckbill shows ads.

### Which is updated more often, Serendipity Labs or Duckbill?

Serendipity Labs ships an update every 3 months, and Duckbill weekly. Most recently, Serendipity Labs was updated on November 7, 2026 and Duckbill on November 3, 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.*