PicZip vs When to Post
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PicZip
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PicZip is a simple, efficient image compression tool that helps you reduce photo file sizes, save storage space, and prepare images for uploading and sharing. Choose a target file size Set your target in KB or MB, or start with the default settings. Apply the same configuration to a single image or an entire batch. Resize when you need to Manual resizing is off by default. Enable it to set a custom width and height and give a group of images consistent pixel dimensions. Select one or more images and compress them with the same settings. Review the original and compressed sizes and the space saved, then save the processed images to Photos in one batch. Useful for organizing photos, preparing images for upload, adjusting ID photo file sizes, and reducing the size of pictures you share. Supports common image formats including JPG, PNG, and HEIF. Output size, format, and image quality depend on the original image and your settings.
When to Post
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Know the best time to post on social media, anywhere in the world. When to Post instantly tells you whether now is a peak posting window for your audience, even if they're in a different timezone. A single colored dot gives you the answer at a glance. Green means a peak posting window is happening right now. Orange means it isn't, and the app tells you exactly what's next: "Ends in 18m", "Today 9PM", or "Tomorrow 3AM". -- SEVEN SOCIAL MEDIA PLATFORMS See the best posting times for: • Facebook • Instagram • LinkedIn • TikTok • X • YouTube • YouTube Shorts Each platform includes its own weekly schedule based on peak engagement times. Hide the platforms you don't use to keep the menu clean and focused. -- BUILT AROUND YOUR AUDIENCE, NOT YOUR CLOCK The best time to post depends on where your audience is, not where you are. Choose your audience's location once, and every posting window is automatically converted to your local time. Search by city, country, timezone, or GMT. Whether you're posting from Paris for New York, Sydney for London, or Tokyo for Los Angeles, the app does the timezone math for you. -- WIDGETS AND NOTIFICATIONS Keep the next posting window on your phone (directly on your lock and apps screens) with small and medium widgets. Prefer not to keep checking? Get notified the moment a peak window begins. -- RESEARCH-BASED RECOMMENDATIONS Posting windows are based on published engagement research across billions of social media posts. Studies identify the strongest hours and weekdays for each platform using the audience's local timezone. These are population averages, not guarantees. Every audience is different, so use the suggested windows as a starting point and refine them with your own analytics over time. -- PRIVATE BY DESIGN No account. No sign in. No tracking. Everything ships inside the app, works completely offline, and never sends your data anywhere.
Screenshots
Verdict
PicZip and When to Post are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | PicZip | When to Post |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | — |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, Mac |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 3 MB | 1 MB |
| Age rating | +4 | 4+ |
| Developer | 利龙 张 | Rebels |
In-app purchases
PicZip
No in-app purchases
When to Post
No in-app purchases









