Privacy-first Mac & iPhone apps, free browser tools, and practical guides.
Everything works on your device: the apps keep your files local, the tools run inside the page, and each guide answers one question with steps we checked.
What can we help with?
Plain answers to practical problems, and the tool or app that does the job.
Compress and convert photos and video
Make files small enough to send or publish, without uploading them anywhere.
Guides
- What is CRF in video compression? CRF values explained (H.264 & HEVC)
- 'iMessage attachment too big' — how to fix it on Mac and iPhone
Apps
Photo privacy and backup
See what a photo gives away, strip the location, and back up originals without iCloud.
Guides
- Remove GPS location from photos before sharing — the iPhone guide
- How to view photo EXIF data on iPhone — GPS, camera settings, and every hidden tag
Apps
Files, images and PDFs on a Mac
Rename in bulk, convert from Terminal, and merge pages into one PDF with what macOS already has.
Guides
Apps
Caffeine and sleep
How long caffeine stays in you, how much is in what you drink, and how to cut back.
Guides
- Caffeine half-life and sleep — when to stop drinking coffee
- How much caffeine is safe during pregnancy? A 2026 guide
Apps
Shipping apps to the App Store
Why App Review rejects small apps and what actually worked for us, plus Apple's own announcements as they happen.
Guides
Free tools in your browser
Nothing is uploaded: files are read and rewritten inside the page.
- Remove photo location and EXIFSee what a photo reveals and download a clean copy.
- Compress and convert imagesShrink photos and convert to WebP, AVIF or JPEG.
- Batch rename plannerPreview new file names, catch clashes, then copy a safe zsh script.
- Combine images into a PDFPhotos and screenshots in one PDF, no watermark.
- Video size calculatorFind the bitrate that fits Discord, email or any size limit.
- Passport photo cropperCrop to ID sizes and make a 300 dpi print sheet.
Latest guides
Each one answers one question first, then shows the steps, with commands and numbers we checked.
- App Review asks "does your app include VPN functionality?": scan the build first, then answerAn automated pre-review message that stops a submission and asks what user information a VPN collects and why. It is a questionnaire, not a rejection. How to scan your binary and write an answer you can verify.
- App Review Guideline 5.6 "Review Suspended": why the date is a schedule, not a bugA Guideline 5.6 suspension names no defect, only a quality standard and a date before which replies and resubmissions are not read. What we do with the window, and why resubmitting early only hurts.
- App Store Guideline 4.3 (Spam) rejection: what it measures and how we got past itGuideline 4.3 and 4.2.6 rejections do not say your app is broken. They say it is hard to tell apart from what is already on the App Store. The order that worked for us: read which of the three similarity tests you hit, change the product, then the store page, then resubmit.
- App Review Guideline 2.5.4 rejection: every background mode is a promiseRejected under 2.5.4 for a background mode the user cannot see being used. Why no local check catches it, and why a scheduled local notification is usually what you wanted instead.
- App Review Guideline 2.3.8 rejection: the store name and the home-screen name do not matchA 2.3.8 (Accurate Metadata) rejection because the name on the store page and the name under the icon differ. Why every build passes, and the order that fixes it: one source, every place, a diff.
- App Review Guideline 2.3.3 rejection: screenshots are metadata that driftsRejected under 2.3.3 (Accurate Metadata) because a screenshot set does not show the app as it really looks on that device. Why uploads pass and review does not, and the order that fixes it.
Apps
Native Mac and iPhone apps that work on your device. Most are free to download with an optional one-time unlock.
Reference
Look-up pages for one specific question: how much caffeine is in a drink, the video size limit of an app, which of our apps fits a task.
- TopicsOne page per task, with the guides, tools, apps and comparisons for it.37 pages
- Caffeine in drinksCaffeine per serving for coffee, tea, energy drinks and milk tea.49 pages
- Video size limits by appThe upload limit for each destination and how to get a video under it.12 pages
- Stickers for messaging appsThe size and format each app needs for stickers, and how to make one.6 pages
For App Store developers: rank checker
Look up where any app places in the App Store top charts, by country and category, updated daily.
- Top free charts in 12 countries, refreshed daily
- Movers, rising apps and weekly reports
- A corner for apps from small developers
How we build
One developer, a small set of rules, applied to every app and tool on this site.
- Your files stay on your device; the browser tools upload nothing
- No trackers and no accounts
- Paid features are mostly a one-time unlock, not a subscription