# Tech Dive vs Time to Surface

The clearest difference is in-app purchases: Time to Surface at none against Tech Dive's 2. Time to Surface also leads on update cadence (every 2 days vs every 4 weeks). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Tech Dive sells 2 in-app purchases, starting at $0.99 per month. Time to Surface asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Tech Dive against 5.0 for Time to Surface. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Tech Dive ships an update every 4 weeks, Time to Surface every 2 days. The most recent releases landed on September 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Tech Dive | Time to Surface |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/tech-dive/id6483004689/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/time-to-surface-deco-planner/id6803187271/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 16 MB | 4 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Skytip LLC](https://appshunter.io/developer/1569880600) | [RUSTAM ISMAILOV](https://appshunter.io/developer/6799582362) |

## What reviewers say

### Tech Dive

[App page](https://appshunter.io/ios/app/tech-dive/id6483004689)

This app helps plan scuba dives with various calculators for gas, depth, and air consumption. It supports metric and imperial units and offers advanced features through an in-app purchase.

**Highlights:** Dive planning calculators, Gas and air consumption calculations, Metric and imperial unit support, Depth and EAD calculations, Enriched Air-Nitrox mix calculation, Unit conversion tools

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $0.99 | per month |
| Plus Annual | $7.99 | per year |


### Time to Surface

[App page](https://appshunter.io/ios/app/time-to-surface-deco-planner/id6803187271)

This technical dive planner calculates staged decompression for dives up to 56 meters. It supports multiple bottom gases and one deco bottle, offering detailed gas planning, runtime tracking, and contingency solutions. The app also accounts for repetitive dives and provides a printable wetnote layout.

**Highlights:** Staged decompression planning (15-56m), Support for six bottom gases and one deco gas, Twin cylinder configuration, Bühlmann ZH-L16C model with adjustable gradient factors, Adjustable ppO2 and descent rates, Repetitive dive planning, Contingency scenario calculations

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Tech Dive free?

Tech Dive is free to download, with in-app purchases available.

### Is Time to Surface free?

Time to Surface is free to download, with no in-app purchases.

### Which has better reviews, Tech Dive or Time to Surface?

Tech Dive and Time to Surface are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Tech Dive or Time to Surface have ads?

Neither Tech Dive nor Time to Surface shows ads.

### Which is updated more often, Tech Dive or Time to Surface?

Tech Dive ships an update every 4 weeks, and Time to Surface every 2 days. Most recently, Tech Dive was updated on September 24, 2026 and Time to Surface on October 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*