Comparison

ZenPDF vs Relay Shortcut Trigger

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ZenPDF

Features
Read full description

ZenPDF is the all-in-one PDF toolkit that works completely offline. No account, no sign-up, no cloud uploads -- your files never leave your iPhone. Whether you're a student organizing notes, a professional handling contracts, or just trying to secure a document with a watermark, ZenPDF gives you every essential PDF tool in one clean, fast app. EVERY TOOL YOU NEED - Merge PDF -- Combine multiple PDFs into a single document. Reorder them exactly how you want before merging. Your original text and quality are preserved. - Compress PDF -- Shrink large PDFs to share them easily. Smart compression optimizes embedded images while keeping your text crisp and selectable. Pick the level that fits. - Edit Metadata -- View and update PDF document properties like Title, Author, Subject, and Keywords in a clean form. - Add Watermark -- Secure your documents with professional text watermarks on all pages. - Image to PDF -- Turn photos, screenshots, and pictures into a polished PDF in seconds. - Scan to PDF -- Use your camera to capture physical documents and save them straight to PDF. - Split PDF -- Pull out single pages or page ranges from any document. - Rotate Pages -- Fix sideways or upside-down pages, all at once or one at a time. - Built-in PDF Viewer -- Open and review your results without leaving the app. WHY ZENPDF - 100% offline -- everything is processed right on your device - No account, no login, no cloud - Text stays text -- we never flatten your PDF into a blurry image - Fast -- heavy work runs in the background so the app never freezes - Unlimited use -- no caps on how many files you merge, scan, or convert - Clean, modern interface with light and dark mode Your documents are yours. ZenPDF processes files locally and never sends their contents anywhere. Download ZenPDF and take control of your PDFs today.

About

Relay Shortcut Trigger

Features
Read full description

Relay turns a spare iPhone or iPad into a hands-free Shortcuts trigger. Run any Shortcut on a repeating interval or at specific times of day, or fire it from another device on your Wi-Fi with a simple, token-protected local web request. No subscription. No account. No cloud. Everything runs on your device and your local network. WHY RELAY Some automations only work when a device actively opens an app or runs a Shortcut — showing a camera dashboard every few minutes, rotating a status display, kicking off a sync, opening a kiosk app on a timer. iOS only allows an app to launch Shortcuts while it is in the foreground, so Relay is built to be exactly that: a reliable foreground scheduler you leave running on a dedicated device. SCHEDULER • Unlimited rules, each with its own Shortcut, interval (from 1 minute) or list of exact times • Optional active window per rule (e.g. only 8:00–17:00), overnight windows supported • Wall-clock scheduling: if a fire time passes while the schedule was paused, Relay catches up the moment it becomes active again • Live countdown to the next trigger, per rule and overall LOCAL NETWORK TRIGGER • Built-in HTTP endpoint on your Wi-Fi: GET /run?shortcut=Name — from a laptop, home server, Raspberry Pi, or any browser • Token-protected (query token or Bearer header), with one-tap token generation • Bonjour advertising (_relay._tcp) so other devices find the phone even when its IP changes • /health and /next endpoints for monitoring and scripting, plus a built-in status web page • Foreground-only and LAN-only by design — nothing is ever exposed to the internet KIOSK ESSENTIALS • Keep-awake (never lets the screen sleep) while active • Stall detection: if another app kept focus and the loop stopped, Relay shows a one-tap resume banner and can notify you • Battery level and charging state on screen, with Guided Access guidance for true kiosk setups • Live event log of every trigger, request, and state change EXTRAS • Home-screen widget with the next trigger and last run • Live Activity countdown in the Dynamic Island while the schedule runs • Diagnostics page: foreground state, listener state, address, recent triggers • Step-by-step onboarding that builds your first automation loop with you Relay is 100% free — every feature, forever. It runs the Shortcuts you created, and it never collects any data.

Screenshots

ZenPDF4 screens
Relay Shortcut Trigger4 screens

Verdict

The call

The clearest difference is ads: Relay Shortcut Trigger at none against ZenPDF's shown. ZenPDF's advantage is iOS requirement (13.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Scorecard2 real differences Ā· 4 level
ZenPDF versus Relay Shortcut Trigger: the parameters behind the verdict, then further details
ParameterZenPDFRelay Shortcut Trigger
PriceFreeFree
Update frequency—Every 2 months
AdsYesNo — better
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS13.0 — better17.0
Further details — not scored
Size62 MB5 MB
Age rating4+4+
DeveloperHaileslassie Lilay DesalegnAll Things AI, Inc

In-app purchases

None

ZenPDF

No in-app purchases

None

Relay Shortcut Trigger

No in-app purchases

Questions

Is ZenPDF free?
ZenPDF is free to download, with no in-app purchases.
Is Relay Shortcut Trigger free?
Relay Shortcut Trigger is free to download, with no in-app purchases.
Do ZenPDF or Relay Shortcut Trigger have ads?
ZenPDF shows ads; Relay Shortcut Trigger does not.

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