Comparison

Mares App vs FishLock

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

Head to head
About

Mares App

Transform your Apple Watch Ultra into a dive computer, recording dives directly on your wrist. Log scuba, freediving, and technical dives, manage dive sites, and track underwater wildlife sightings. Share your adventures with dive buddies and keep your equipment details organized.

Highlights
  • Apple Watch Ultra dive computer integration
  • Digital dive logbook
  • Dive site database and management
  • Underwater wildlife tracking
  • Dive buddy sharing
  • Dive equipment management
  • Firmware updates
Features
Read full description

APPLE WATCH ULTRA DIVE COMPUTER Transform your Ultra into a dive computer. Record dives directly on your wrist and sync automatically to the Mares App. (In-app purchase required.) DIGITAL LOGBOOK: Log your Scuba, Freediving, Extended Range and Rebreather (SCR/CCR) dives in seconds via Bluetooth. Easily share your dives via QR code. Add new dives with your device’s GPS and download your dives from selected dive computers (1*). DIVE SITES: With the help of the Mares dive site database, you can immediately assign a dive site to your logged dives. You can also add your own private dive sites and share them with your dive buddies using a QR code. You can download your dive data directly from selected Mares dive computers . WILDLIFE: A variety of local wildlife is already stored in the app for individual dive sites. This means you can immediately assign the highlights of your underwater encounters to your logged dives. Your sightings are displayed on your personal world map. DIVE BUDDIES: Easily add your dive buddies via QR code or manually in the app. Share your best dives and most exciting animal encounters with friends using the Mares app. STATISTICS: All your dives and data can be seen at a glance, including your longest or deepest dive, your average dive time and more! DIGITAL EQUIPMENT: Store important dive equipment details, including serial numbers, photos and invoices. Enter maintenance dates and keep track of when your equipment needs to be serviced. NEWS AND VIDEOS: Stay up-to-date with all the latest news and videos from the world of water sports and diving. FIRMWARE: When you connect your dive computer to the app, you will be able to confirm if you have the latest firmware. As soon as it is outdated, you will receive a message regarding the newest firmware to download. TABLES: Here you will find useful information such as decompression tables and emergency scenarios. 1* Currently available for MARES Sirius, Sirius L, Sirius Hunter, Horizon, Genius, Quad CI, Quad 2, Quad Air, Quad, Puck 4, Puck Pro EZ, Puck lite, Puck Pro, Puck Pro Plus, Puck Air 2, Smart, Smart Apnea, Smart Air Terms of Use (EULA) Mares App for Apple Watch Ultra: https://my.divessi.com/published/viewhls/awu_terms_v1/2

About

FishLock

Read full description

FishLock - Identify and measure fish in seconds, completely offline. FishLock identifies 640 species, measures catches to ±0.25", and keeps your photos and catch log private on your phone. Try it free with 5 fish identifications. Like it? Unlock unlimited use with one one-time purchase. No subscription. No account. No cloud. FishLock uses advanced computer vision to identify and measure fish in real time, with no reference object required. Species identification is powered by world-class Fishial.ai technology, developed by the Wye Foundation and adapted to run directly on your device. * Identify 640 of the most commonly fished species in seconds * Measure fish to ±0.25" with no reference object needed * Get 5 fish identifications free * Unlock unlimited use with a one-time purchase * Save photos and catches to your private logbook * Works without cell service, Wi-Fi, or an internet connection * No subscription and no account required * Simple to use and suitable for all ages FishLock is a fully offline, on-device app built for wherever you fish, from backwaters and mountains to offshore waters.Identification, measurement, photos, and catch data stay on your device. Your fishing data never leaves your phone. FishLock - Cloud-Free Fishing Thank you for supporting an independent app developer.

Screenshots

Mares App4 screens
FishLock4 screens

Verdict

The call

The clearest difference is in-app purchases: FishLock at none against Mares App's 8. FishLock also leads on update cadence (every 5 days vs every 3 weeks). On price, ads, device support and iOS requirement 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. Mares App sells 8 in-app purchases, starting at $2.99 per month. FishLock asks for nothing beyond the download.

UpkeepUpdate frequency

Mares App ships an update every 3 weeks, FishLock every 5 days. The most recent releases landed on October 14, 2026 and September 30, 2026 respectively.

Scorecard2 real differences · 8 level
Mares App versus FishLock: the parameters behind the verdict, then further details
ParameterMares AppFishLock
PriceFreeFree
Rating4.5 (189 ratings) — better—
Positive reviews46.7% of reviews—
Number of ratings189 — better—
Update frequencyEvery 3 weeksEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS16.615.1 — better
Further details — not scored
Size247 MB220 MB
Age rating4+4+
DeveloperHead Watersports S.p.A.Matthew Berlin

In-app purchases

8 purchases

Mares App

Subscriptions8
  • Snorkel Only$2.991 Month
  • Full Featured Month (Housing Only)3 Days trial$6.991 Month
  • Full Featured Month (Ultra Only)3 Days trial$6.991 Month
Show 5 more
  • MARES Fully Featured Monthly3 Days trial$8.991 Month
  • Full Featured Yearly (Housing Only)3 Days trial$49.991 Year
  • Full Featured Yearly (Ultra Only)3 Days trial$49.991 Year
  • MARES Fully Featured Yearly3 Days trial$69.991 Year
  • MARES Fully Featured Yearly Family3 Days trial$119.991 Year
None

FishLock

No in-app purchases

Questions

Is Mares App free?
Mares App is free to download, with in-app purchases available.
Is FishLock free?
FishLock is free to download, with no in-app purchases.
Do Mares App or FishLock have ads?
Neither Mares App nor FishLock shows ads.
Which is updated more often, Mares App or FishLock?
Mares App ships an update every 3 weeks, and FishLock every 5 days. Most recently, Mares App was updated on October 14, 2026 and FishLock on September 30, 2026.

Other comparisons