# Duckbill vs Theo

Duckbill and Theo both sit at 4.3 stars, but that hides the real split: 74% of Duckbill's written reviews are positive against 0% of Theo's. Duckbill also leads on in-app purchases (none vs 9) and ads (none vs shown). On price, rating and iOS requirement there is nothing between them.

Both are free to download. Theo sells 9 in-app purchases, starting at $4.99 per 7 days. Duckbill asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.3 for Duckbill against 4.2 for Theo. Both are backed by a comparable volume of ratings — 70 and 16 respectively. Written reviews are what separate them: 74% of Duckbill's written reviews are positive against 0% of Theo's.

Duckbill ships an update weekly, Theo every 2 weeks. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Duckbill | Theo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (70 ratings)](https://appshunter.io/ios/app/duckbill/id6455085338/reviews)** | [4.2 (16 ratings)](https://appshunter.io/ios/app/theo-stop-overthinking/id6759104892/reviews) |
| Number of ratings | **70** | 16 |
| Positive reviews | **74.4% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 116 MB | 42 MB |
| Requires iOS | **15.1** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [Duckbill Technologies, Inc.](https://appshunter.io/developer/1699836267) | [Kilby Labs Inc.](https://appshunter.io/developer/6778542781) |

## What reviewers say

### 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


### Theo

[App page](https://appshunter.io/ios/app/theo-stop-overthinking/id6759104892)

This app helps you stop overthinking by guiding you through a structured analysis of your worries and decisions. It uses evidence-based reasoning to show you the actual probabilities of your concerns, replacing feelings with clarity.

**Highlights:** Structured journaling for worries, Evidence-based probability analysis, Interactive what-if sliders, Sensitivity analysis of evidence, Private thinking journal, Bayesian reasoning framework

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Theo Plus - Weekly Subscription | $4.99 | per 7 days |
| Theo Plus - Monthly Subscription | $9.99 | per month |
| Theo Plus - 3 Month Subscription | $12.99 | per 3 months |
| Theo Plus - Semiannual Subscription | $39.99 | per 6 months |
| Theo Plus - Annual Subscription | $39.99 | per year |
| Theo Plus - Semiannual Subscription | $39.99 | per 6 months |
| Theo Plus - Semiannual Subscription | $59.99 | per 6 months |
| Theo Plus - Annual Subscription | $69.99 | per year |
| Theo Plus - Annual Subscription | $99.99 | per year |


## Frequently asked questions

### Is Duckbill free?

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

### Is Theo free?

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

### Which has better reviews, Duckbill or Theo?

Duckbill is rated higher. Duckbill averages 4.3 out of 5 from 70 ratings, while Theo averages 4.2 from 16 ratings.

### Do Duckbill or Theo have ads?

Theo shows ads; Duckbill does not.

### Which is updated more often, Duckbill or Theo?

Duckbill ships an update weekly, and Theo every 2 weeks. Most recently, Duckbill was updated on October 24, 2026 and Theo on October 20, 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.*