ReadSync
Pick up exactly where you left off.
Open a PDF on your Mac, read to page 120, then pick up your iPhone. ReadSync opens the same document on the same page — with your highlights, notes and bookmarks already there.
No account. No subscription. No server.
Every reader has the same small daily annoyance: you close a document, open it again tomorrow, and you're back at page 1.
ReadSync remembers. Not just on this device — on all of them.
What You Get
Your page, everywhere
Your reading position syncs through your own iCloud. No account to create, nothing to set up.
Highlights and notes
Five highlight colours and a note on any passage — all synced, all in one list you can tap to jump.
A reader that gets out of the way
Controls hide while you read. Night mode darkens the page without draining the colour from your highlights.
Find your place fast
Full-text search, the PDF's own table of contents, and bookmarks for the pages you return to.
Your files stay yours
Nothing is written into the PDF. Nothing is uploaded to anyone's server. Works fully offline.
Reading stats
Total reading time, the last seven days, and progress on everything you've started.
ProHow It Works
Add a document
From Files or iCloud Drive. Leave it where it is, or copy it into ReadSync to sync it across devices.
Read
Highlight, note, bookmark. Everything saves as you go.
Switch device
Open ReadSync on your other Mac or iPhone. Same document, same page.
Your files never leave your iCloud
Built entirely on Apple's own frameworks. Your documents and notes live in your private iCloud database — not on a server I own, because there isn't one. No account, no tracking of what you read, no ads.
Your original PDF is never modified — highlights are stored separately and drawn back on top. No internet? Everything works offline; syncing is a layer on top, never a requirement.
Pricing
Syncing is free for everyone. It costs me nothing, so it costs you nothing.
Free
Everything the app does, with two limits.
- Sync across all your devices
- Up to 5 documents
- 10 highlights or notes per document
- Everything else, in full
ReadSync Pro
One-time purchase. No subscription.
- Unlimited documents
- Unlimited highlights and notes
- Reading statistics
- One payment, on all your devices
Limits only apply to adding new things. Everything already in your library stays fully readable.