Comparison

V vs Slate

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

Head to head
About

V

This app is a dive decompression calculator for technical scuba divers, implementing the VPM decompression model. It supports various gas mixes, planning methods for open circuit and rebreathers, and includes detailed dive planning tools and a gas blending utility.

Highlights
  • VPM-B and VPM-B/E decompression models
  • Support for nitrox and trimix gases
  • OC and CCR planning
  • Bailout planning for CCR
  • ppO2, END, and gas consumption details
  • Dive planning tools (best mix, MOD, END, EAD)
  • Gas blending utility
Read full description

A dive decompression calculator for technical scuba divers. V-Planner presents the VPM decompression model and includes both VPM-B and VPM-B/E model versions. The diver can specify any combination of nitrox or trimix, and as many deco gases as required. Planning methods include both OC and Closed Circuit Rebreather. It includes planning for bailouts with SCR and OC legs in a CCR plan. Includes details of ppO2, END, and gas consumptions. This program includes many of the features from the desktop version such as conservatism adjustments, extended stops, adjustable last stops, the planning monitor system and extensive control over many other planning features. Also included is a set of dive planning tools for calculating best mix, maximum operating depth (MOD), END, EAD and other planning considerations. The Mixer utility for blending nitrox and trimix, is included too.

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

V4 screens
Slate4 screens

Verdict

The call

The clearest difference is price: Slate at Free against V's $48.99. Slate also leads on update cadence (weekly vs every 3 months). V's advantage is in-app purchases (none vs 2) and iOS requirement (17.6 vs 26.0). On ads and device support 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

Slate is free to download; V costs $48.99 up front. Slate sells 2 in-app purchases, starting at $29.99 per year. V asks for nothing beyond the download.

UpkeepUpdate frequency

V ships an update every 3 months, Slate weekly. The most recent releases landed on October 22, 2026 and October 7, 2026 respectively.

Scorecard4 real differences · 6 level
V versus Slate: the parameters behind the verdict, then further details
ParameterVSlate
Price$48.99Free — better
Rating4.1 (7 ratings) — better—
Positive reviews67.9% of reviews—
Number of ratings7 — better—
Update frequencyEvery 3 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPad — betteriPhone
Requires iOS17.6 — better26.0
Further details — not scored
Size3 MB16 MB
Age rating4+4+
DeveloperHHS Software Corp.Tools for Divers, LLC

In-app purchases

None

V

No in-app purchases

2 purchases

Slate

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

Questions

Is V free?
V costs $48.99, with no in-app purchases.
Is Slate free?
Slate is free to download, with in-app purchases available.
Do V or Slate have ads?
Neither V nor Slate shows ads.
Which is updated more often, V or Slate?
V ships an update every 3 months, and Slate weekly. Most recently, V was updated on October 22, 2026 and Slate on October 7, 2026.

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