MultiDeco vs Retra UWT
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MultiDeco
This app calculates dive decompression for technical scuba divers using VPM and ZHL-16 models. It supports various gas mixes, planning methods for open circuit and rebreathers, and includes tools for gas blending and depth calculations.
- VPM and ZHL-16 decompression models
- Support for nitrox and trimix
- OC and CCR planning
- Bailout planning
- Gas blending utility
- Depth calculation tools
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A dive decompression calculator for technical scuba divers. MultiDeco presents the VPM and ZHL-16 decompression model and includes VPM-B, VPM-B/E, ZHL model versions and ZHL-16 + GF. 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.
Retra UWT
This app connects to compatible flash devices, allowing users to monitor usage statistics, receive firmware updates, and access user manuals. It serves as a comprehensive tool for managing and maintaining your flash hardware.
- Connect to Retra Flash devices
- View usage statistics
- Receive firmware updates
- Access user manuals
- Device management
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The companion App for Retra Flash devices. Connect your Retra Flash via the App, check usage statistics, get firmware updates, access user manuals and more.
Screenshots
Verdict
The clearest difference is review sentiment: Retra UWT at 100% against MultiDeco's 39%. Retra UWT also leads on price (Free vs $48.99) and rating (4.7 vs 3.9). MultiDeco's advantage is chart position (#100 vs unranked) and ratings volume (11 vs 3). On update cadence, ads, 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
Retra UWT is free to download; MultiDeco costs $48.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Retra UWT holds the better App Store score, 4.7 against 3.9. Both are backed by a comparable volume of ratings — 11 and 3 respectively. Written reviews point the same way: 39% of MultiDeco's written reviews are positive against 100% of Retra UWT's.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 19, 2026 and September 16, 2026 respectively.
| Parameter | MultiDeco | Retra UWT |
|---|---|---|
| Price | $48.99 | Free — better |
| Rating | 3.9 (11 ratings) | 4.7 (3 ratings) — better |
| Positive reviews | 38.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 11 — better | 3 |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #100 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 51 MB |
| Age rating | 4+ | 17+ |
| Developer | HHS Software Corp. | Retra UWT, Ltd. |
Customer experience
MultiDeco
Retra UWT
In-app purchases
MultiDeco
No in-app purchases
Retra UWT
No in-app purchases
