Comparison

Pi Relay vs Difftray

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

Head to head
About

Pi Relay

Features
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Pi Relay is a companion iPhone app for the Pi coding agent. It lets you connect securely to your own Pi remote-control server, browse active projects and sessions, and continue conversations from your phone. Pairing is simple: install the Pi remote-control extension on the machine running Pi, open the pairing QR code, and scan it with Pi Relay. Once paired, you can switch between remotes, view project sessions, read conversation history, send new prompts, abort running work, and request context compaction with /compact. Pi Relay is designed for users who already run Pi on their own computer or development environment and want a lightweight mobile companion for monitoring and continuing work away from the desktop. Key features: - QR-code pairing with your Pi remote-control server - Remote list with quick switching and unpairing - Project and session browsing - Conversation view with selectable and copyable messages - Runtime status and context usage display - Prompt sending, abort support, and /compact support - Live session updates while the app is active Pi Relay requires a running Pi remote-control extension/server. The extension is available at: https://github.com/zerray/pi-remote-control

About

Difftray

Features
Read full description

Difftray brings code review to your phone and tablet. Pair it with the open-source Difftray desktop app, then read git diffs, browse every changed file, and leave line-by-line comments โ€” all over your own local network, with no cloud in between. Difftray is a companion app. It works alongside the Difftray desktop app running on your Mac. Scan a QR code once to pair, then pick up any project from the couch, a meeting room, or the other side of the office. REVIEW DIFFS ANYWHERE Read inline diffs with real syntax highlighting, sized for small screens. See additions and deletions at a glance, move between changes, and mark each file reviewed as you go. BROWSE CHANGED FILES Step through every changed file in a project and see exactly what moved, with per-file and total added/removed line counts. HAND OFF TO YOUR CODING AGENT Leave comments on the lines that need work, then export them as an agent-ready prompt. Copy it or share it straight into your AI coding agent so the fixes are queued up before you're back at your keyboard. ALL YOUR PROJECTS Every project open on your desktop is one tap away on your phone or tablet. PAIR LOCALLY, STAY PRIVATE Connect by scanning a QR code or entering a short code โ€” no account, no sign-up. Your phone talks directly to your own computer over local Wi-Fi, or over your private Tailscale network when you're away from your desk. Pairing is end-to-end encrypted, and your code never touches a server we run. REQUIREMENTS Difftray requires the free, open-source Difftray desktop app with its companion server enabled. This mobile app is a companion to that desktop app and does not work on its own. Pair your phone, step away from your desk, and keep reviewing. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Pi Relay4 screens
Difftray4 screens

Verdict

The call

Pi Relay and Difftray are too close to call on the numbers: across 6 compared parameters โ€” price, update cadence, ads and in-app purchases among them โ€” neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

Pi Relay ships an update fortnightly, Difftray every 11 days. The most recent releases landed on September 29, 2026 and September 28, 2026 respectively.

ScorecardNo meaningful differences
Pi Relay versus Difftray: the parameters behind the verdict, then further details
ParameterPi RelayDifftray
PriceFreeFree
Update frequencyFortnightlyEvery 11 days โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhoneiPhone, iPad โ€” better
Requires iOS17.016.4 โ€” better
Further details โ€” not scored
Size2 MB70 MB
Age rating12+4+
DeveloperZerui ZhouMarco Gomiero

In-app purchases

None

Pi Relay

No in-app purchases

None

Difftray

No in-app purchases

Questions

Is Pi Relay free?
Pi Relay is free to download, with no in-app purchases.
Is Difftray free?
Difftray is free to download, with no in-app purchases.
Do Pi Relay or Difftray have ads?
Neither Pi Relay nor Difftray shows ads.
Which is updated more often, Pi Relay or Difftray?
Pi Relay ships an update fortnightly, and Difftray every 11 days. Most recently, Pi Relay was updated on September 29, 2026 and Difftray on September 28, 2026.

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