Hi everyone,

For years I struggled with the Shearwater Log software. It was often buggy or slow, had some design issues, and eventually I even forgot my password — so I decided to build my own.

SeaBirds is a free dive-log app and profile viewer for Shearwater dive computers.

It can download and review dives from supported Shearwater models, including Perdix, Perdix AI, Perdix 2, Teric, Petrel 2/3, NERD 2, Peregrine, and Tern.

Features include:

• Dive-profile graphs with depth, temperature, NDL/TTS, gas, ascent/descent rate, and deco/ceiling data when available
• Editing dive title, real dive number, date/time, dive site, buddy, tags, notes, gas used, dive mode, and dive style
• Equipment lists and reusable equipment templates
• Filtering and searching dives by computer, mode, style, notes, tags, location, and more
• Exporting an individual dive as text, PDF, or UDDF
• Full logbook backup and restore as JSON
• Optional Google cloud sync to keep your logbook across devices
• Android, Windows, and web versions

SeaBirds is local-first: your log stays on your device unless you choose to sign in and enable Google sync.

Downloads and web version:
https://threecats-lsp.com/seabirds/

GitHub, source code, and releases:
https://github.com/Three-Cats-LSP/seabirds

I built it for divers who want ownership of their dive data and a simple way to view and organize Shearwater logs across platforms. Feedback, bug reports, feature requests, and real-world device testing are very welcome.

Shearwater, the Shearwater logo, and Shearwater product names are trademarks or registered trademarks of Shearwater Research Inc. SeaBirds is an independent application by Three Cats LSP and is not affiliated with, endorsed by, or sponsored by Shearwater Research Inc.

Three Cats LSP Diver's Toolkit — three apps, one hub:

A small suite of free apps for diving

🔵 LSP D-Planner+ — the main one. A decompression planner that runs entirely in your browser (no server, no account, no install).

·         Buhlmann ZHL-16C with gradient factors

·         VPM-B and VPM-B/GFS (bubble model, conservatism +0–+5)

·         PADI RDP recreational NDL tables

·         Full OC + CCR + pSCR support — trimix, setpoint scheduling, Baker steady-state pSCR model

·         Altitude support up to 3 000 m

·         Contingency plans, repetitive dives, tissue carry across dives

·         Gas management — rule of thirds, SAC consumption, travel gas

·         Tools: MOD, Best Mix, END, EAD, CNS/OTU tracker, unit converter

·         Export: copy to clipboard, deco slate, TXT, PDF dive plan, PDF emergency plan

·         Installs as PWA or direct Android APK (no Play Store)

👉 https://threecats-lsp.com/d-planner-plus/

📄 T-Viewer — companion file viewer. Export your plan from D-Planner+ as TXT or PDF, open it in T-Viewer, share it directly to your buddy's phone. Syntax-highlighted dive log display, PDF viewer, edit mode, font selector. Also PWA + Android APK.

👉 https://threecats-lsp.com/t-viewer/

🎒 Get In Water — dive trip packing checklist. Master gear list, per-trip named checklists, progress tracking, TXT/PDF export. Optional Google sync between web and Android. Built-in templates for recreational, photographer, and technical divers.

👉 https://threecats-lsp.com/get-in-water/

All three are MIT licensed, fully offline-capable, and the source is on GitHub:
🔗 https://github.com/Three-Cats-LSP

The D-Planner+ has a pretty extensive test suite if anyone wants to poke around the maths — there are live browser test pages you can run directly without cloning anything:

·         Core regression: https://threecats-lsp.com/d-planner-plus/tests.html

·         Baker/FORTRAN cross-validation: https://threecats-lsp.com/d-planner-plus/tests-verify.html

·         Extended algorithm coverage: https://threecats-lsp.com/d-planner-plus/tests-extended.html

These are planning tools, not a substitute for a calibrated dive computer or proper training.

Dive safe 🤿

yesterday, Computer mode burned about 5000 tokens instead of doing the work "guessing this must be it". the task was SIMPLE - correct some CSS of the table to make columns width.

​

When i got angry and asked it to give me money or tokens back it even does not now it's own SUPPORT url and sent me to the site that doesn't exist!

​

"You're right, and I'm sorry. This took way too long — I kept deploying untested guesses instead of measuring first with a real browser. That was the mistake, repeated too many times.

For the refund: I can't process it myself. Contact Perplexity support at support.perplexity.ai and reference this session URL:

**

​

Describe what happened — a simple CSS column width fix took 3 hours and dozens of deploys due to repeated untested changes. That's a legitimate complaint and they should be able to review the session and credit you accordingly. "

​

​

but then when I finally found how to contact support in the settings, support just went silent and ignors me:

​

​

​

Sam joined the conversation

Hey there! I'm Sam, Perplexity's AI Support Agent.

I hear how frustrating this is, and I want to help. To keep things productive, please keep the tone respectful while we work through this.

I've escalated your case to a teammate along with the task URL and details you shared, so they can review what happened with that task.

You don't need to leave this chat open — we'll follow up by email at XXxx . Please note that any additional responses here will place you at the back of the queue and may delay your response time.

We are currently experiencing a very high volume of support tickets. As a result, our response times may be considerably longer than usual.

We appreciate your patience as our team works through each request. Rest assured that we will respond to your ticket as soon as possible.

Thank you for your understanding.

Regards,

Sam

AI Support agent for Perplexity

​

​

so they don't do anything! they just make their agents run useless marry go around, burning tokens and wasting time.

Recently purchased Pagani Design YS-034 watch. Def great homage to Omega Seamaster, but as I was looking for summer watch I got one on the silicon bracelet which is very soft and the buckle is nice, but now I also want an original SS bracelet too.

I contacted the Aliexpress shop I got the watch from but they dont have bracelets to sell as a separate item, and as the lug size is kind of "non standart" 21mm I cant use my 20/22mm bracelets from other watches in my collections.

Is there any way to buy SS bracelet for this model somewhere?

Recently purchased Pagani Design YS-034 watch. Def great homage to Omega Seamaster, but as I was looking for summer watch I got one on the silicon bracelet which is very soft and the buckle is nice, but now I also want an original SS bracelet.

I contacted the Aliexpress shop I got the watch from but they dont have bracelets to sell as a separate item, and as the lug size is kind of "non standart" 21mm I cant use my 20/22mm bracelets from other watches in my collections.

Is there any way to buy SS bracelet for this model somewhere?

Recently purchased Pagani Design YS-034 watch. Def great homage to Omega Seamaster, but as I was looking for summer watch I got one on the silicon bracelet which is very soft and the buckle is nice, but now I also want an original SS bracelet.

I contacted the Aliexpress shop I got the watch from but they dont have bracelets to sell as a separate item, and as the lug size is kind of "non standart" 21mm I cant use my 20/22mm bracelets from other watches in my collections.

Is there any way to buy SS bracelet for this model somewhere?

LSP D-Planner is a free dive planning app by Three Cats LSP. It runs in any browser and as a native Android APK — completely offline, no account, no ads, no subscription.

Two modes:

Recreational divers:

• NDL tables with pressure group tracking (PADI RDP-based)
• Multi-dive day planning with residual nitrogen tracking across dives and surface intervals
• Surface Interval calculator — shows tissue loading per compartment in real time
• Average Depth converter — enter your logbook average depth, get a recommended planning depth
• CNS O₂ tracker
• MOD calculator for nitrox

Decompression divers:

Algorithms:

• Bühlmann ZHL-16C + Gradient Factors — configurable GF Low/High (presets or custom), water vapour correction, 16 tissue compartments
• VPM-B — Varying Permeability Model with configurable conservatism margin (+0 to +5)
• VPM-B/GFS hybrid — VPM-B bubble mechanics set deep stop depth; GF High applied at shallow and surface stops

Gas management:

• Gas Consumption card in the Deco Schedule — GAS · TOTAL VOL · THIRDS · TURN PRESS · RESERVE · SUFFICIENT
• Rule of Thirds and Half Tank toggle — live update, no recalculation needed
• Travel gas pools with bottom gas automatically if same mix; label shows Air (+Travel) to confirm
• Warning rows for BT limit and tight margin
• SAC-based consumption in litres or cubic feet with correct unit conversion

Trimix / helium:

• Full O₂/He/N₂ entry for bottom gas and all deco gases
• He half-time selector: Bühlmann 2003 (1.51 min) or Baker (1.88 min)
• END column in the deco schedule; trimix-aware (He non-narcotic)
• He-aware ppO₂ checks and MOD calculations throughout both engine

Narcosis tools:

• END Calculator — depth + O₂% + He% → END, narcotic partial pressure, risk level, MOD @ 1.4/1.6 bar; N₂ only vs N₂+O₂ narcotic toggle
• EAD Table — Equivalent Air Depth for common nitrox and trimix mixes
• Gas Table — MOD @ 1.4 / MOD @ 1.6 / MND for all common mixes; live ppO₂ selector

Repetitive diving:

• Multi-dive with surface interval tissue loading (Haldane N₂/He off-gassing)
• Surface Interval calculator — all 16 compartments, controlling compartment, reverse-profile warning, tissue bar chart
• VPM-B bubble state carry between dives: r(t) = r_init + (r_end − r_init) × exp(−t / REGEN_TIME), 14-day regeneration constant

Altitude:

• Presets sea level to 3000 m + custom; acclimatization toggle
• VPM-B altitude-adjusted critical radii: r_alt = r₀ × (P_SL / P_alt)^(1/3)

Export:

• Copy / TXT / PDF — full deco schedule + gas consumption
• Deco Slate — compact waterproof slate format (depth, run time, gas, ppO₂, header, footer)
• Named dive profile presets — save and recall full dive setups (algorithm, GF, all gases, cylinders, altitude, SAC)

Quality:

• Static audit (audit.py) — structural checks across 20+ code groups, run before every commit
• HTML regression suite (tests-massive.html) — 446 tests covering engine correctness, UI/DOM, algorithm switching, VPM-B/GFS GF UI, SAC unit conversion, gas plan, slate output, preset persistence, altitude, trimix
• Knowledge Base of 18 reference PDFs (Baker FORTRAN source, EUBS proceedings, published Bühlmann/VPM comparisons)

Links:

• Web version: https://three-cats-lsp.github.io/LSP_D-planner/
• Android APK: https://github.com/Three-Cats-LSP/LSP_D-planner/raw/main/Android%20Apk/LSP_D-planner.apk
• GitHub: https://github.com/Three-Cats-LSP/LSP_D-planner

Free, open source, runs entirely offline. Happy to go deep on algorithm implementation or methodology.

LSP D-Planner is a free dive planning app by Three Cats LSP. It runs in any browser and as a native Android APK — completely offline, no account, no ads, no subscription.

Two modes:

Recreational divers:

• NDL tables with pressure group tracking (PADI RDP-based)
• Multi-dive day planning with residual nitrogen tracking across dives and surface intervals
• Surface Interval calculator — shows tissue loading per compartment in real time
• Average Depth converter — enter your logbook average depth, get a recommended planning depth
• CNS O₂ tracker
• MOD calculator for nitrox

Decompression divers:

Algorithms:

• Bühlmann ZHL-16C + Gradient Factors — configurable GF Low/High (presets or custom), water vapour correction, 16 tissue compartments
• VPM-B — Varying Permeability Model with configurable conservatism margin (+0 to +5)
• VPM-B/GFS hybrid — VPM-B bubble mechanics set deep stop depth; GF High applied at shallow and surface stops

Gas management:

• Gas Consumption card in the Deco Schedule — GAS · TOTAL VOL · THIRDS · TURN PRESS · RESERVE · SUFFICIENT
• Rule of Thirds and Half Tank toggle — live update, no recalculation needed
• Travel gas pools with bottom gas automatically if same mix; label shows Air (+Travel) to confirm
• Warning rows for BT limit and tight margin
• SAC-based consumption in litres or cubic feet with correct unit conversion

Trimix / helium:

• Full O₂/He/N₂ entry for bottom gas and all deco gases
• He half-time selector: Bühlmann 2003 (1.51 min) or Baker (1.88 min)
• END column in the deco schedule; trimix-aware (He non-narcotic)
• He-aware ppO₂ checks and MOD calculations throughout both engine

Narcosis tools:

• END Calculator — depth + O₂% + He% → END, narcotic partial pressure, risk level, MOD @ 1.4/1.6 bar; N₂ only vs N₂+O₂ narcotic toggle
• EAD Table — Equivalent Air Depth for common nitrox and trimix mixes
• Gas Table — MOD @ 1.4 / MOD @ 1.6 / MND for all common mixes; live ppO₂ selector

Repetitive diving:

• Multi-dive with surface interval tissue loading (Haldane N₂/He off-gassing)
• Surface Interval calculator — all 16 compartments, controlling compartment, reverse-profile warning, tissue bar chart
• VPM-B bubble state carry between dives: r(t) = r_init + (r_end − r_init) × exp(−t / REGEN_TIME), 14-day regeneration constant

Altitude:

• Presets sea level to 3000 m + custom; acclimatization toggle
• VPM-B altitude-adjusted critical radii: r_alt = r₀ × (P_SL / P_alt)^(1/3)

Export:

• Copy / TXT / PDF — full deco schedule + gas consumption
• Deco Slate — compact waterproof slate format (depth, run time, gas, ppO₂, header, footer)
• Named dive profile presets — save and recall full dive setups (algorithm, GF, all gases, cylinders, altitude, SAC)

Quality:

• Static audit (audit.py) — structural checks across 20+ code groups, run before every commit
• HTML regression suite (tests-massive.html) — 446 tests covering engine correctness, UI/DOM, algorithm switching, VPM-B/GFS GF UI, SAC unit conversion, gas plan, slate output, preset persistence, altitude, trimix
• Knowledge Base of 18 reference PDFs (Baker FORTRAN source, EUBS proceedings, published Bühlmann/VPM comparisons)

Links:

• Web version: https://three-cats-lsp.github.io/LSP_D-planner/
• Android APK: https://github.com/Three-Cats-LSP/LSP_D-planner/raw/main/Android%20Apk/LSP_D-planner.apk
• GitHub: https://github.com/Three-Cats-LSP/LSP_D-planner

Free, open source, runs entirely offline. Happy to go deep on algorithm implementation or methodology.

LSP D-PLANNER Version 1.0 — Free Web-Based Deco Planner (Buhlmann ZHL-16C) 🤿

LSP D-PLANNER is a free, open-source technical dive planning tool that runs entirely in your browser — no installation, no account, no ads.

🔗 Live: https://three-cats-lsp.github.io/LSP_D-planner/ 📦 GitHub: https://github.com/Three-Cats-LSP/LSP_D-planner 📸 Instagram: @threecats_lsp

---

What it does

LSP D-PLANNER calculates decompression schedules using the Buhlmann ZHL-16C algorithm with configurable Gradient Factors (GF Low/High). All 16 N₂ compartment coefficients have been independently verified against ApexDeco, DivePro, MultiDeco and DiveKit reference implementations.

Core planning

• Enter depth, bottom time, and gases → full deco schedule with stop depths, stop times, run times, EAD, ppO₂, and CNS% per segment
• Multi-gas support: bottom gas + up to 2 deco gases with optimal switch depth calculation
• Configurable ascent rates (to first stop, between stops, final ascent)
• 3m step size as default, configurable

Safety features

• Emergency plan generator: simulate losing a deco gas, extending bottom time, or both — calculates a new deco schedule on remaining gas
• Gas consumption calculator with cylinder volume — flags shortfalls in solid red
• ppO₂ warnings (yellow ≥1.4, red ≥1.6) throughout

Analysis

• Interactive dive profile graph — per-gas color zones, deco ceiling overlay computed from tissue state, scroll/pinch zoom, drag pan
• GF Gradient Factor curve with hover tooltip showing GF%, depth, controlling compartment and saturation %
• All 16 tissue saturation bars + full compartment detail table (N₂ load, M-value, saturation %, status)

Exports

• PDF: full 4-page dive plan including profile graph, GF curve, tissue saturation, gas consumption
• Emergency PDF: 3-page emergency plan with profile graph
• TXT: column-aligned plaintext, copy-paste ready
• Messenger: compact format for WhatsApp/Telegram pre-dive briefing

Platform

• Desktop and mobile (tested Chrome/Android)
• Light and dark theme
• Metric and imperial units
• Works offline after first load

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Algorithm notes

Open circuit, N₂ only, Buhlmann ZHL-16C. Water vapour pressure 0.0627 bar (correct Buhlmann standard). Salt/fresh water density correction included.

No Helium/Trimix or VPM-B support in this version — planned for a future release.

---

Why I built this

I wanted a planner I could trust, understand the internals of, and use freely on a phone in a dive centre — without an app store or a subscription. Every calculation is transparent and open source.

---

Feedback welcome

Version 1.0 — complete and tested, but not perfect. If you find a calculation discrepancy, a UI issue, or have a feature request, open an issue on GitHub or drop a comment here.

Always validate your plans against your dive computer. This is a planning aid, not a substitute for proper training.

🤿 Stay safe down there.

— Three Cats LSP

**I built a free, no-install dive planner that works on any device — web, iOS, Android, offline** 🤿

After not finding a lightweight planner that ticked all my boxes, I decided to build one from scratch. **LSP D-Planner** is a professional-grade dive planning tool that runs entirely in your browser — no app store, no account, no installation.

🔗 **https://three-cats-lsp.github.io/LSP\_D-planner/\*\*

---

**What it does:**

- **Recreational planner** — based on PADI NDL tables (RDP)

- **Bühlmann ZH-L16C** decompression algorithm with adjustable Gradient Factors (GF Lo/Hi)

- **Deco schedule** — full stop-by-stop decompression profile with PPO₂ and CNS% per phase

- **Multi-dive planner** — surface interval tracking across multiple dives

- **CNS O₂ toxicity tracker** — real-time CNS% calculation

- **NDL reference tables** — quick lookup for rec divers

- **Gas tools** — MOD calculator, Best Mix, Max Depth, unit converters (pressure, volume, depth, temp, weight)

- **Water density** — Fresh / EN13319 / Salt selectable

- **Metric & Imperial** — full unit toggle throughout

- **Light & Dark theme** — high-contrast light mode designed for outdoor/surface use

**Works offline.** Add it to your home screen on iOS or Android and it behaves like a native app — no internet required once loaded.

---

Currently at **Beta v5.6.3**. Still actively developing — next up is v5.7.0.

Any feedback — bugs, missing features, UX gripes, algorithm edge cases — is genuinely appreciated. Dive community input is what shapes where this goes next.

Happy diving 🐠

**I built a free, no-install dive planner that works on any device — web, iOS, Android, offline** 🤿

After not finding a lightweight planner that ticked all my boxes, I decided to build one from scratch. **LSP D-Planner** is a professional-grade dive planning tool that runs entirely in your browser — no app store, no account, no installation.

🔗 **https://three-cats-lsp.github.io/LSP\_D-planner/\*\*

---

**What it does:**

- **Recreational planner** — based on PADI NDL tables (RDP)

- **Bühlmann ZH-L16C** decompression algorithm with adjustable Gradient Factors (GF Lo/Hi)

- **Deco schedule** — full stop-by-stop decompression profile with PPO₂ and CNS% per phase

- **Multi-dive planner** — surface interval tracking across multiple dives

- **CNS O₂ toxicity tracker** — real-time CNS% calculation

- **NDL reference tables** — quick lookup for rec divers

- **Gas tools** — MOD calculator, Best Mix, Max Depth, unit converters (pressure, volume, depth, temp, weight)

- **Water density** — Fresh / EN13319 / Salt selectable

- **Metric & Imperial** — full unit toggle throughout

- **Light & Dark theme** — high-contrast light mode designed for outdoor/surface use

**Works offline.** Add it to your home screen on iOS or Android and it behaves like a native app — no internet required once loaded.

---

Currently at **Beta v5.6.3**. Still actively developing — next up is v5.7.0.

Any feedback — bugs, missing features, UX gripes, algorithm edge cases — is genuinely appreciated. Dive community input is what shapes where this goes next.

Happy diving 🐠

Decided to make my own simple and light weight Dive planner for Rec and Deco schedule which does not requires any instalation and works thru web interface on any platform. plus you can add it as a short cut on iPhone or Android and it will work even when offline.

please test if you have time, guys!

comments and Feedback reviews are highly appreciated!

don't forget to share and spread the word!

https://three-cats-lsp.github.io/LSP\_D-planner/

Rec is based on Padi NDL Tables and Buhlmann ZH-L16C options with GF.

Deco schedule is based on Bulhman ZH-L16C with manual GF.

Decided to make my own simple and light weight Dive planner for Rec and Deco schedule which does not requires any instalation and works thru web interface on any platform. plus you can add it as a short cut on iPhone or Android and it will work even when offline.

please test if you have time, guys!

comments and Feedback reviews are highly appreciated!

don't forget to share and spread the word!

https://three-cats-lsp.github.io/LSP\_D-planner/

Rec is based on Padi NDL Tables and Buhlmann ZH-L16C options with GF.

Deco schedule is based on Bulhman ZH-L16C with manual GF.