Comparison

Deep Tools vs Slate

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

Head to head
About

Deep Tools

This comprehensive dive toolkit helps recreational, advanced, and technical divers plan dives, log underwater adventures, and blend gases. It offers advanced planning tools, dive computer import, and essential calculations for safe and efficient diving.

Highlights
  • Advanced Deco Planner
  • Dive Log with Shearwater import
  • Gas Blender for Trimix/Nitrox
  • Maximum Operating Depth (MOD) calculator
  • No Decompression Limit (NDL) tracking
  • Metric and Imperial units
Features
Read full description

The Complete Dive Toolkit Deep Tools is a must-have application for recreational, advanced, and technical divers. Whether you are learning to dive, planning complex decompression dives, or logging your underwater adventures, Deep Tools provides reliable tools you can trust. Import dives directly from your Shearwater dive computer, plan dives using the advanced Deco Planner, or use the app as a practical learning aid during your dive training. Tools included:
 - Maximum Operating Depth (MOD) - Oxygen Partial Pressure (ppO₂) - Equivalent Air Depth (EAD) - Equivalent Narcotic Depth (END) - Equivalent Air Density Depth (EADD) - No Decompression Limit (NDL) - Best Trimix for depth - Best Nitrox for depth - Gas consumption and density - Calculator for lifting bag Dive Log: * - Import dives from Shearwater dive computers (Petrel, Perdix, NERD, Teric, etc.) - Log dive sites with name, coordinates, and custom tags - Automatically merge dives with short surface intervals - Share logged dives with your buddies - Create local backups or migrate data to another device Advanced Dive Planner: * Plan complex dives with confidence, whether on Open Circuit (OC) or Rebreather (CCR): - Repetitive dive planning - Bühlmann ZH-L16B and ZH-L16C with Gradient Factors - Gas consumption, CNS, and OTU calculations - Visual dive profile, text plan, pressure graph, and slate view - Lost gas planning - CCR Bailout planning - Multiple point dive plan with custom bailout points - Share dive plans with friends Gas Blender: * Prepare accurate breathing gas mixtures: - Trimix and Nitrox blending - Mix to desired gas - Mix with Top-off gas - Continuous flow blending Additional Features - Metric and Imperial units - Adjustable altitude and water type (EN13319, salt, fresh) - Set your altitude - Custom tank / cylinder database * Advanced features are available with a subscription or during the free trial. Special thanks to V. Paul Gordon, Serge Nelissen and Michael Heus for extensive testing and valuable contributions! Terms of Service: http://www.deepblue.si/privacy/terms-of-service.php

About

Slate

Read full description

Every dive tells a story. Slate keeps the record. Slate is a professional dive logbook for iPhone. Log dives manually, import wirelessly from your dive computer, track your career stats, and export your data whenever you want. Your logbook, your device, your data. DIVE LOGGING - Manual entry: depth, duration, temperature, gas mix, gear, buddy, rating, GPS coordinates, and notes - Air, nitrox, and trimix gas logging with full mix details - Gear configuration tracking per dive - GPS-tagged dive sites - Star rating and personal notes DIVE COMPUTER IMPORT - Wireless Bluetooth import from Shearwater, Suunto, Mares, Oceanic, and more - UDDF file import for any computer that exports the format - Depth profile data preserved from each download - Incremental sync: only new dives are transferred - Multi-computer support: one logbook, every computer you own CAREER DASHBOARD - Total dives, total bottom time, deepest dive, career milestones - Personal bests across your entire logbook - Dive frequency heatmap - Depth and temperature trend charts over time - On-device analysis surfaces patterns across your dives (iPhone 15 Pro and later) SEARCH AND EXPORT - Full-text search across your entire logbook: sites, buddies, notes, gear - CSV and UDDF export, always free, no restrictions - Backup and restore your complete logbook LOCAL-FIRST DESIGN - No account required. No cloud dependency. No server storing your dives. - Your data stays on your device. Period. - iCloud backup compatible for device migration - Works offline at any dive site FREEMIUM DONE RIGHT - Log every dive for free. No dive limit, no trial period. - Slate Premium unlocks career analytics, trends, on-device analysis, and advanced features. - Slate Premium (Annual): $29.99/year, auto-renewing. - Slate Premium (Lifetime): $79.99, one-time purchase. - No ads. No data collection. No account wall. APPLE HEALTH INTEGRATION - Imports underwater depth and water temperature data from Apple Watch dive sessions via Apple Health. - Read-only: Slate does not write data to Apple Health. Slate is agency-neutral. Whether you trained with PADI, SSI, TDI, NAUI, GUE, BSAC, or CMAS, your logbook works the same way. Available in English, Spanish, French, German, Japanese, and Italian. Privacy Policy: https://toolsfordivers.com/privacy Terms of Use: https://toolsfordivers.com/terms/ EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ A Tools for Divers, LLC product.

Screenshots

Deep Tools4 screens
Slate4 screens

Verdict

The call

The clearest difference is update cadence: Slate at weekly against Deep Tools's every 6 weeks. Deep Tools's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 26.0). On price, ads and in-app purchases 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. Deep Tools sells 3 in-app purchases, starting at $2.99 per month and Slate sells 2 in-app purchases, starting at $29.99 per year. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Deep Tools ships an update every 6 weeks, Slate weekly. The most recent releases landed on October 3, 2026 and October 7, 2026 respectively.

Scorecard3 real differences · 7 level
Deep Tools versus Slate: the parameters behind the verdict, then further details
ParameterDeep ToolsSlate
PriceFreeFree
Rating4.6 (93 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings93 — better—
Update frequencyEvery 6 weeksWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better26.0
Further details — not scored
Size12 MB16 MB
Age rating4+4+
DeveloperDeep Blue d.o.o.Tools for Divers, LLC

In-app purchases

3 purchases

Deep Tools

Subscriptions2
  • Subscription Monthly$2.991 Month
  • Subscription Yearly3 Days trial$17.991 Year
One-time1
  • Lifetime Subscription$39.99
2 purchases

Slate

Subscriptions1
  • Slate Premium Annual$29.991 Year
One-time1
  • Slate Premium Lifetime$79.99

Questions

Is Deep Tools free?
Deep Tools is free to download, with in-app purchases available.
Is Slate free?
Slate is free to download, with in-app purchases available.
Do Deep Tools or Slate have ads?
Neither Deep Tools nor Slate shows ads.
Which is updated more often, Deep Tools or Slate?
Deep Tools ships an update every 6 weeks, and Slate weekly. Most recently, Deep Tools was updated on October 3, 2026 and Slate on October 7, 2026.

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