# TopicFlow vs SignBack

The clearest difference is in-app purchases: SignBack at none against TopicFlow's 3. TopicFlow's advantage is iOS requirement (15.0 vs 18.0). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. TopicFlow sells 3 in-app purchases, starting at $4.99 per month. SignBack asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for TopicFlow against 5.0 for SignBack. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

TopicFlow ships an update every 9 days, SignBack every 5 days. The most recent releases landed on September 28, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | TopicFlow | SignBack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/topicflow-ai-notes/id6765620478/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/signback-sign-pdf-documents/id6779878583/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 5 days** |
| Monetization | Freemium | **Free** |
| Size | 67 MB | 8 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [亦君 潘](https://appshunter.io/developer/1889920920) | [Silvergrove Labs LLC](https://appshunter.io/developer/6779878585) |

## What reviewers say

### 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 |


### SignBack

[App page](https://appshunter.io/ios/app/signback-sign-pdf-documents/id6779878583)

Effortlessly sign and fill out documents on your device without printing or scanning. Create multiple identities for different roles and use the smart assistant to quickly complete forms. All processing is done locally for maximum privacy.

**Highlights:** 100% free access, Secure local processing, Multiple identities, Smart fast fill assistant, Multi-format support, Sign and send back in one tap, Scan paper documents

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

**In-app purchases:** none


## Frequently asked questions

### Is TopicFlow free?

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

### Is SignBack free?

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

### Which has better reviews, TopicFlow or SignBack?

TopicFlow and SignBack are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do TopicFlow or SignBack have ads?

Neither TopicFlow nor SignBack shows ads.

### Which is updated more often, TopicFlow or SignBack?

TopicFlow ships an update every 9 days, and SignBack every 5 days. Most recently, TopicFlow was updated on September 28, 2026 and SignBack on September 17, 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.*