Comparison

ATMOS vs DecoPlan

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

Head to head
About

ATMOS

Easily sync and manage your dive logs wirelessly from compatible dive computers. View device information, edit log details, and export your data in UDDF format. Integrates with HealthKit to share dive-related health metrics.

Highlights
  • Wireless dive log syncing
  • Dive computer information
  • Edit dive log details
  • Export logs to UDDF
  • HealthKit integration
Read full description

ATMOS App is the best companion of Mission One and Mission2, Mission3 dive computer. You can use ATMOS App to : ● Wirelessly sync your device's divelogs. ● Check device information. ● Edit divelog information. ● Export divelog to UDDF format. ATMOS use HealthKit to export your Mission2 health data (Steps, Calories, Sleep, Heart rate) into the Health app. Official website : https://www.atmos.app FaceBook fan page: https://www.facebook.com/atmosocean/ Follow us on Instagram : @atmos_ocean

About

DecoPlan

Features
Read full description

DecoPlan is a universal dive planner for open-circuit and rebreather (CCR) divers, built around two published decompression models: VPM-B with the critical-volume algorithm and Bühlmann ZHL-16C with gradient factors. NO-DECO PLANNER • No-decompression limits for air and nitrox, safety stop, gas needed • Repetitive dives with surface intervals, altitude and fresh water • NDL table for every mix at a glance TECHNICAL PLANNER • Multi-level profiles, any number of gases (nitrox, trimix, oxygen) • Automatic deco-gas switches by ppO₂, last stop at 3 or 6 m, air breaks on O₂ • Runtime table with ppO₂, END, ceiling; depth profile with the ceiling band • Tissue loading graph, CNS/OTU, gas consumption per cylinder, minimum gas, turn pressure • Model comparison: the same dive through six model settings side by side • Contingency grid: what happens 3/6/9 m deeper or 5/10/15 min longer • Lost-gas scenarios, wet-notes text export REBREATHER (CCR) · PRO • Setpoints for bottom and deco, setpoint switching by depth • Diluent plus up to ten bailout cylinders with their own mixes • Open-circuit bailout: a failure at the turn point (half the bottom time) with the swim back, or at the end of the bottom time • Bailout advisor: how many cylinders, which mixes, switch depths and sizes for the planned depth TOOLS • MOD, END, EAD, gas density, best mix, partial-pressure blending, SAC calculator Six languages: English, Russian, German, Spanish, Simplified and Traditional Chinese. All features, including the Pro feature set (CCR and SCR, VPM-B and VPM-B/GFS, multi-level profiles, more than two deco gases, oxygen breaks, contingency and lost-gas plans, model comparison, team planning, sync between devices), are free for 30 days from download, or from first launch if the download date is unavailable. No in-app purchase or subscription can be bought at this time, and the app contains no advertising. A genuine paid annual subscription continues until the end of the term already paid for, and a lifetime purchase remains valid. Any other access previously granted to an existing account is honored only for the period already granted and does not become unlimited. Existing plans, dive logs, equipment, trips, photos and account data are preserved. IMPORTANT DecoPlan is a planning tool for trained divers. Every decompression model is an approximation; verify plans with another planner and your dive computer, keep gas reserves, and never dive beyond your training. The app is not a medical device and does not guarantee safety. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://decoplan.dvpdnsca.org/privacy.html © 2026 Dmitri Plotnikov (dvp)

Screenshots

ATMOS4 screens
DecoPlan3 screens

Verdict

The call

The clearest difference is ads: ATMOS at none against DecoPlan's shown. ATMOS also leads on iOS requirement (15.0 vs 17.0). DecoPlan's advantage is update cadence (every 2 days vs every 6 weeks). On price, in-app purchases 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

ATMOS ships an update every 6 weeks, DecoPlan every 2 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
ATMOS versus DecoPlan: the parameters behind the verdict, then further details
ParameterATMOSDecoPlan
PriceFreeFree
Rating1.7 (23 ratings) — better—
Positive reviews7.7% of reviews—
Number of ratings23 — better—
Update frequencyEvery 6 weeksEvery 2 days — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size119 MB76 MB
Age rating4+9+
DeveloperATMOS CO., LTD.Dmitri Plotnikov

In-app purchases

None

ATMOS

No in-app purchases

None

DecoPlan

No in-app purchases

Questions

Is ATMOS free?
ATMOS is free to download, with no in-app purchases.
Is DecoPlan free?
DecoPlan is free to download, with no in-app purchases.
Do ATMOS or DecoPlan have ads?
DecoPlan shows ads; ATMOS does not.
Which is updated more often, ATMOS or DecoPlan?
ATMOS ships an update every 6 weeks, and DecoPlan every 2 days. Most recently, ATMOS was updated on November 2, 2026 and DecoPlan on October 31, 2026.

Other comparisons