# Abysner vs Time to Surface

The clearest difference is price: Time to Surface at Free against Abysner's $2.99. Time to Surface also leads on update cadence (every 2 days vs every 2 months). Abysner's advantage is device support (3 vs 1) and iOS requirement (15.3 vs 17.0). On rating, ratings volume, ads and in-app purchases there is nothing between them.

Time to Surface is free to download; Abysner costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

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

Abysner ships an update every 2 months, Time to Surface every 2 days. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Abysner | Time to Surface |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/abysner/id6636477320/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 | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Paid | **Free** |
| Size | 42 MB | 4 MB |
| Requires iOS | **15.3** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Roelof Rene Smit](https://appshunter.io/developer/1762786000) | [RUSTAM ISMAILOV](https://appshunter.io/developer/6799582362) |

## What reviewers say

### Abysner

[App page](https://appshunter.io/ios/app/abysner/id6636477320)

This app is an open-source dive planning tool designed for simplicity and ease of use. It supports various gas mixes and decompression models, allowing for accurate planning of technical and recreational dives. Its intuitive interface makes it suitable for use even in challenging conditions.

**Highlights:** Buhlmann ZHL-16 A, B, C models, Multi-gas support (Air, Nitrox, Trimix, etc.), OTU and CNS tracking, Customizable environmental settings, Intuitive gas picker, Automatic contingency plans, Multi-level dive planning

**In-app purchases:** none


### 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 Abysner free?

Abysner costs $2.99, with no in-app purchases.

### Is Time to Surface free?

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

### Which has better reviews, Abysner or Time to Surface?

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

### Do Abysner or Time to Surface have ads?

Neither Abysner nor Time to Surface shows ads.

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

Abysner ships an update every 2 months, and Time to Surface every 2 days. Most recently, Abysner was updated on October 5, 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.*