# Inbox Zero vs TopicFlow

The clearest difference is rating: TopicFlow at 5.0 against Inbox Zero's 1.0. TopicFlow also leads on monetization model (freemium vs subscription). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Inbox Zero sells 2 in-app purchases, starting at $19.99 per month and TopicFlow sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

TopicFlow holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Inbox Zero ships an update weekly, TopicFlow every 9 days. The most recent releases landed on October 3, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Inbox Zero | TopicFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/inbox-zero-ai-email-assistant/id6759736561/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/topicflow-ai-notes/id6765620478/reviews)** |
| Number of ratings | 1 | 1 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 9 days |
| Monetization | Subscription | **Freemium** |
| Size | 57 MB | 67 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Inbox Zero Inc.](https://appshunter.io/developer/1880462164) | [亦君 潘](https://appshunter.io/developer/1889920920) |

## What reviewers say

### Inbox Zero

[App page](https://appshunter.io/ios/app/inbox-zero-ai-email-assistant/id6759736561)

This AI-powered assistant helps you manage your email inbox efficiently. It prioritizes important messages, drafts replies in your style, and helps you unsubscribe from unwanted newsletters. Automate email handling with custom rules and stay in control of your communications.

**Highlights:** Prioritize important emails, Draft AI-assisted replies, Unsubscribe from newsletters, Bulk archive emails, Create custom automation rules, Manage multiple Gmail accounts

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Inbox Zero Starter Monthly | $19.99 | per month |
| Inbox Zero Starter Annual | $199.99 | per year |


### TopicFlow

[App page](https://appshunter.io/ios/app/topicflow-ai-notes/id6765620478)

This app transforms AI conversations into structured, reusable notes, plans, and summaries. It allows users to branch discussions for focused follow-ups and capture key ideas before they are lost. Organize your AI-generated content locally and export it when ready.

**Highlights:** Transform AI chats into reusable notes, Branch conversations for focused follow-ups, Capture and organize key ideas, Refocus AI discussions without re-prompting, Export and share selected content, Local topic history organization, Connect own AI provider keys

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TopicFlow Monthly Subscription | $4.99 | per month |
| TopicFlow Yearly Subscription | $29.99 | per year |
| TopicFlow Lifetime Access | $69.99 | one-time |


## Frequently asked questions

### Is Inbox Zero free?

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

### Is TopicFlow free?

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

### Which has better reviews, Inbox Zero or TopicFlow?

TopicFlow is rated higher. Inbox Zero averages 1.0 out of 5 from 1 ratings, while TopicFlow averages 5.0 from 1 ratings.

### Do Inbox Zero or TopicFlow have ads?

Neither Inbox Zero nor TopicFlow shows ads.

### Which is updated more often, Inbox Zero or TopicFlow?

Inbox Zero ships an update weekly, and TopicFlow every 9 days. Most recently, Inbox Zero was updated on October 3, 2026 and TopicFlow on September 28, 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.*