# postalk vs Source Browser for Research

The clearest difference is ads: Source Browser for Research at none against postalk's shown. Source Browser for Research also leads on update cadence (every 3 days vs monthly). postalk's advantage is iOS requirement (15.6 vs 17.2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. postalk sells 2 in-app purchases, starting at $5.99 per month and Source Browser for Research sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

postalk ships an update monthly, Source Browser for Research every 3 days. The most recent releases landed on October 12, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | postalk | Source Browser for Research |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 3 days** |
| Size | 90 MB | 6 MB |
| Requires iOS | **15.6** | 17.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [postalk株式会社](https://appshunter.io/developer/1660710551) | [YUKIYA SHIMODA](https://appshunter.io/developer/6804373908) |

## What reviewers say

### postalk

[App page](https://appshunter.io/ios/app/postalk/id1660710549)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 使い放題プラン | $5.99 | per month |
| 年額8,980円 | $59.99 | per year |


### Source Browser for Research

[App page](https://appshunter.io/ios/app/source-browser-for-research/id6806154744)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TEXT MAP | $1.99 | one-time |


## Frequently asked questions

### Is postalk free?

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

### Is Source Browser for Research free?

Source Browser for Research is free to download, with in-app purchases available.

### Do postalk or Source Browser for Research have ads?

postalk shows ads; Source Browser for Research does not.

### Which is updated more often, postalk or Source Browser for Research?

postalk ships an update monthly, and Source Browser for Research every 3 days. Most recently, postalk was updated on October 12, 2026 and Source Browser for Research on October 11, 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.*