Comparison

Blue Trails vs Interval

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

Head to head
About

Blue Trails

Read full description

Blue Trails is a free scuba diving app and digital dive log, built by divers. Log every dive, find your next dive site, explore wrecks in 3D and share your dives with your buddies. YOUR DIVE LOG, DONE RIGHT Keep a complete record of every dive: depth, bottom time, visibility, water temperature, tank, gas and nitrox mix, weights and more. Import dives from your dive computer files, add photos and videos, and export your whole logbook to PDF. GOT AN OLD PAPER LOGBOOK? Take a photo of a page and Blue Trails reads your dives and adds them to your digital logbook. Your whole diving history, finally in one place. FIND YOUR NEXT DIVE SITE Browse thousands of dive sites on the map, read reviews from other divers and rate the spots you have been to. Each site shows its depth, coordinates and the marine life you can expect to see there. EXPLORE WRECKS IN 3D Many wrecks come with a 3D model. Spin it, zoom in and plan your route before you get in the water. Filter the map to see wrecks only. KNOW WHAT LIVES THERE Photos, size, conservation status and a short description for each species, in your language. A LOGBOOK OTHER DIVERS CAN TRUST Ask instructors, dive centers or buddies to validate your dives and build a verified dive history. ALL YOUR DOCUMENTS IN YOUR POCKET Store your diving certifications, insurance and medical record in the app. Link with your dive center so they have your details before you arrive, and revoke access any time. SEE HOW YOUR DIVING ADDS UP Stats with records, yearly charts and air-consumption trends. Earn achievement badges as your logbook grows. DIVE WITH YOUR BUDDIES Follow other divers, join dive groups, share dives so your buddies can add them to their own logbook, and share your profile with a QR code. NOT TIED TO ANY BRAND Sign in with your email, Google or Apple in seconds. Blue Trails is not tied to any dive computer manufacturer. You decide who sees your dives, and your data is yours. Terms of Use (EULA): https://bluetrails.eu/policy.html?policyUUID=d7d44a2b-1df1-4d8c-ac46-3dbf7b4f3a7e

About

Interval

Features
Read full description

Your dives, beautifully remembered. Interval is a personal dive logbook for life underwater. Bring your recorded dive profiles, photos and memories together, then revisit them across your Apple devices. Free, with no subscriptions. IMPORT FROM YOUR DIVE COMPUTER. Bring recorded dives into Interval from a compatible dive computer in just a few taps. Support varies by model and connection. EXPLORE THE PROFILE. MOMENT BY MOMENT. Follow the descent and the way back up. Inspect depth, temperature and the other measurements your computer recorded, moment by moment. PHOTOS, NOTES AND DIVE BUDDIES. Add photos, videos, notes, tags and buddies to every dive. Record conditions and equipment, then choose a favourite moment as the cover. SEE YOUR STATISTICS AT A GLANCE. Look back on your dives, explore your statistics and see your time underwater add up. Return to favourite sites and see where you’ve dived on the map. FIND ANSWERS WITH APPLE INTELLIGENCE. Scan your dive logs with Apple Intelligence to find the answers you’re looking for. Beta. Requires Apple Intelligence on iOS 27, iPadOS 27 or macOS 27. ONE LOGBOOK, KEPT IN SYNC. Your dives, kept in sync across iPhone, iPad, Mac, Apple Watch and Apple TV through your own private iCloud. PRIVATE BY DESIGN. Interval has no accounts. No analytics, telemetry, advertising identifiers or tracking. YOUR LOGBOOK GOES WITH YOU. Share dive records with friends, or export your logbook as UDDF whenever you want. Free. No subscriptions. Just diving.

Screenshots

Blue Trails4 screens
Interval4 screens

Verdict

The call

The clearest difference is in-app purchases: Interval at none against Blue Trails's 3. Interval also leads on ads (none vs shown) and update cadence (every 4 days vs every 11 days). Blue Trails's advantage is iOS requirement (15.0 vs 26.0). On price there is nothing between them.

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. Blue Trails sells 3 in-app purchases, starting at $14.99 per year. Interval asks for nothing beyond the download.

UpkeepUpdate frequency

Blue Trails ships an update every 11 days, Interval every 4 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 1 level
Blue Trails versus Interval: the parameters behind the verdict, then further details
ParameterBlue TrailsInterval
PriceFreeFree
Update frequencyEvery 11 daysEvery 4 days — better
AdsYesNo — better
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPodiPhone, iPad, Mac, Apple TV, Apple Watch — better
Requires iOS15.0 — better26.0
Further details — not scored
Size121 MB87 MB
Age rating17+4+
DeveloperBlue Trails GmbHBrian Groskamp

In-app purchases

3 purchases

Blue Trails

Subscriptions3
  • Seahorse Subscription$14.991 Year
  • Turtle Subscription$54.991 Year
  • Shark Subscription$99.991 Year
None

Interval

No in-app purchases

Questions

Is Blue Trails free?
Blue Trails is free to download, with in-app purchases available.
Is Interval free?
Interval is free to download, with no in-app purchases.
Do Blue Trails or Interval have ads?
Blue Trails shows ads; Interval does not.
Which is updated more often, Blue Trails or Interval?
Blue Trails ships an update every 11 days, and Interval every 4 days. Most recently, Blue Trails was updated on October 30, 2026 and Interval on October 31, 2026.

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