# PDF Editor vs When to Post AI

PDF Editor and When to Post AI are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. PDF Editor sells 8 in-app purchases, starting at $4.99 per 7 days and When to Post AI sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

PDF Editor ships an update every 2 days, When to Post AI daily. The most recent releases landed on September 30, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | PDF Editor | When to Post AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (6 ratings)](https://appshunter.io/ios/app/when-to-post-ai-insta/id6762572607/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 days | **Daily** |
| Monetization | — | Freemium |
| Size | 22 MB | 21 MB |
| Requires iOS | **16.0** | 17.1 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hnat Dorosh](https://appshunter.io/developer/1856609511) | [Jack Solomon](https://appshunter.io/developer/586848650) |

## What reviewers say

### PDF Editor

[App page](https://appshunter.io/ios/app/pdf-editor-files-converter/id6755830098)

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smart PDF Editor | $4.99 | per 7 days |
| Smart PDF Editor | $4.99 | per 7 days |
| Smart PDF Editor | $9.99 | per year |
| Smart PDF Editor | $14.99 | per 3 months |
| Smart PDF Editor | $19.99 | per year |
| Smart PDF Editor | $19.99 | per year |
| Smart PDF Editor | $29.99 | per year |
| Smart PDF Editor | $29.99 | per year |


### When to Post AI

[App page](https://appshunter.io/ios/app/when-to-post-ai-insta/id6762572607)

This app helps Instagram and TikTok creators optimize their posting times for maximum engagement. It uses AI to analyze audience activity and provides personalized schedules and reminders, eliminating guesswork.

**Highlights:** AI-driven audience activity analysis, Personalized weekly posting schedule, Push reminders for peak engagement, Clear reasoning for time recommendations, Privacy-first approach, no logins required, Today and Week view for posting windows

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $7.99 | per month |
| Pro Yearly | $29.99 | per year |


## Frequently asked questions

### Is PDF Editor free?

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

### Is When to Post AI free?

When to Post AI is free to download, with in-app purchases available.

### Do PDF Editor or When to Post AI have ads?

Neither PDF Editor nor When to Post AI shows ads.

### Which is updated more often, PDF Editor or When to Post AI?

PDF Editor ships an update every 2 days, and When to Post AI daily. Most recently, PDF Editor was updated on September 30, 2026 and When to Post AI on October 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.*