Comparison

TrailLink vs SYNC

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

Head to head
About

TrailLink

Features
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TrailLink is the ultimate offline communication app for hiking, camping, mountaineering, and outdoor adventures. When you are off the grid with no Wi-Fi or cellular signal, TrailLink keeps your team connected — or lets you adventure solo. How It Works TrailLink uses Bluetooth Mesh technology to create a decentralized peer-to-peer network between nearby devices. Messages hop from phone to phone, extending your reach far beyond Bluetooth range. Key Features Offline Mesh Messaging Send text messages to your group without internet, cellular, or Wi-Fi. Perfect for remote trails, mountains, and wilderness areas. Real-Time Location Sharing See your teammates' positions on an offline map. Know exactly where everyone is, even in the most remote locations. Share your location automatically or manually with one tap. New: Solo Mode Hiking alone? Start a solo trip with one tap — no group needed. Your location is never broadcast, while offline track recording still works. Your trip is restored automatically if the app relaunches. New: Track Recording & Sharing Record your route offline with distance, duration and elevation stats. Share a beautiful track card with your nickname, or export your track as a GPX file for OsmAnd and other outdoor apps. One-Tap SOS Alert In an emergency, press and hold the SOS button. Your location is instantly broadcast to all team members with full-screen alerts, vibration, and sound. Help finds you faster. Offline Maps Download maps before your trip and use them completely offline. No signal? No problem. Your team's locations are always visible on the map. Lock Screen & Widgets See teammates' status on your Lock Screen with Live Activity and Dynamic Island, and check online count and nearest teammate right from your home screen widgets. Group Management Create a hiking team, share a unique group ID and password, and invite members via QR code. Everyone stays in sync. Private and Secure All communication is encrypted. No personal data is collected, no servers involved, your privacy is protected. Free vs Pro Free Version - Up to 5 team members - Manual location sharing - 100 message history limit - Basic SOS alerts - Track recording & sharing TrailLink Pro (One-Time Purchase 9.99 USD) - Unlimited team members - Auto location sharing with adjustable frequency - Unlimited message history - Offline map downloads - Hybrid relay for extended range - Priority SOS broadcast - Track replay with speed control - GPX track export TrailLink Pro (Monthly Subscription 0.99 USD per month) - All Pro features - Cancel anytime Download TrailLink today and never lose connection with your team, even when the signal does. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

SYNC

Features
Read full description

Half game, half chat. Seven questions a day, the same for everyone: answer, guess what share of people answered like you, and from 21:00 see how well you read them. Then talk with other players in rooms for your game and language, or one to one. Each time you open SYNC, you choose a half. THE GAME Most of the time your guess is wrong. That is the whole point. - Seven questions land at midnight: how you hang the toilet roll, whether you rinse pasta, what you would do with a wallet you found - Tap your answer, predict the split, and change your choice until you tap “Lock it in” - From 21:00, once the reveal is published, your summary is free: majority, minority or split, how close your guess was, your streak and day grid - Wednesday is Civil War day: one question that splits people close to fifty-fifty - Duo: after your first viewed reveal, invite one person and guess each other - The deeper answers are never shown next to your name, to anyone THE PLAYER CHAT (ADULTS ONLY) The chat is the same in every Erek Studio game that has it: one account, made with Sign in with Apple, for adults only (18+, 19+ in Korea). The questions need no sign-in. - Rooms for each game and language, and one-to-one messages; a first message from someone new arrives as a request - You choose who to talk to: there is no matching - Report or block anyone from their message or profile; what you report is hidden for you at once - Messages are checked for safety by Anthropic's AI; you agree to this before you join - Text only, no photos or links; a profile photo comes with Chat+ and is checked by AI before anyone sees it - With notifications on, you know when a message or a chat request arrives; they never show what it says - In Korea, the chat is SYNC's Korean room, and one-to-one messages go only between people who both wrote there - Delete your chat account in the app at any time SYNC PREMIUM AND CHAT+ SYNC Premium adds exact percentages with 20+ answers, your region vs the world when comparable data exists, calibration and rarity detail, Editors vs you where an editorial guess is available, week and month numbers when there is enough history, and every day you have played in the archive. SYNC Premium is an auto-renewing subscription, monthly or yearly. Eligible new subscribers can try its yearly plan free for 7 days where offered. Chat+ is an auto-renewing subscription, monthly or yearly. Bought in SYNC, it also gives everything SYNC Premium gives. In the chat: - Unlimited direct messages - Looks and a profile photo - Contact sharing: only in an accepted one-to-one chat, once the other person has written 3 times; they can turn it off. Never in rooms or profiles - Outside Korea: create your own rooms, public or invite-only, and find players by country and language Chat+ works in every Erek Studio game where you sign into the chat. Bought in SYNC without a chat account, it unlocks SYNC's perks on this device; signing into the chat later moves it to your account. Restore purchases brings back both. Payment is charged to your Apple ID when you confirm the purchase, or after an applicable free trial ends. Subscriptions renew automatically at the same price unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel them anytime in your Apple ID settings. Terms of Use: https://mustafasalimerek-bit.github.io/sync-legal/terms.html Privacy Policy: https://mustafasalimerek-bit.github.io/sync-legal/privacy.html

Screenshots

TrailLink4 screens
SYNC4 screens

Verdict

The call

TrailLink and SYNC are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. TrailLink sells 2 one-off in-app purchases and SYNC sells 4 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

TrailLink ships an update every 6 weeks, SYNC every 5 weeks. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

ScorecardNo meaningful differences
TrailLink versus SYNC: the parameters behind the verdict, then further details
ParameterTrailLinkSYNC
PriceFreeFree
Update frequencyEvery 6 weeksEvery 5 weeks — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.015.0
Further details — not scored
Size41 MB71 MB
Age rating4+9+
Developer孝桂 张Mustafa Salim Erek

In-app purchases

2 purchases

TrailLink

One-time2
  • TrailLink Pro (Monthly)$0.99
  • TrailLink Pro$9.99
4 purchases

SYNC

Subscriptions4
  • Chat+ Monthly$4.991 Month
  • SYNC Premium Monthly$4.991 Month
  • Chat+ Yearly$29.991 Year
Show 1 more
  • SYNC Premium Yearly7 Days trial$29.991 Year

Questions

Is TrailLink free?
TrailLink is free to download, with in-app purchases available.
Is SYNC free?
SYNC is free to download, with in-app purchases available.
Do TrailLink or SYNC have ads?
Neither TrailLink nor SYNC shows ads.
Which is updated more often, TrailLink or SYNC?
TrailLink ships an update every 6 weeks, and SYNC every 5 weeks. Most recently, TrailLink was updated on November 5, 2026 and SYNC on November 10, 2026.

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