Moon Dog
Small, useful apps for hobbyists and makers. No subscriptions, no ads.
Available now
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Frost: Cold Plunge Care
Dosing math and maintenance reminders for chlorine or hydrogen-peroxide cold plunges — chiller or DIY.
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Soak: Hot Tub Assistant
Spa chemistry made simple. Dosing math for chlorine and bromine tubs.
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Reef: Aquarium Chemistry
Saltwater reef dosing — calcium, alkalinity, and magnesium — with safe daily-rise limits.
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Aquascape: Planted Tank Calc
Planted-aquarium fertilizer dosing — EI, PPS-Pro, PMDD, or custom, dry salts or brand-aware liquids.
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Pond: Koi Chemistry
Koi pond water chemistry — corrective doses for KH, ammonia, nitrite, with named-source warnings.
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Saline: Saltwater Pool Care
Saltwater pool dosing — salt, stabilizer, and saturation index tuned to your chlorine-generator cell.
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Splash: Chlorine Pool Care
Chlorine pool dosing — FC/CYA-aware targets, shock math, and the levels that keep water balanced.
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Crust: Pizza Dough Calculator
Style-aware dough math, a cold-ferment backtimer, and a symptom troubleshooter.
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Crop: Hydroponic Calculator
Hydroponic nutrient dosing — target ppm to salt weights or brand kits, per-crop targets, EC/pH logging.
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Press: Hard Cider Calculator
Cidermaker chemistry — apple blends, acidity and tannin balance, and YAN/nutrient math to avoid H₂S.
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Strip: USDA Jerky Safety
USDA-cited jerky safety — kill-step temperatures, cure and Prague-powder math, and safe drying.
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Seal: Home Canning Safety
USDA-tested home canning — altitude-aware processing times and pressures, with a jar-failure diagnostic.
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Flush: Mushroom Cultivation
Gourmet and medicinal mushroom cultivation — substrate hydration, biological efficiency, agar and spawn math.
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Flux: Glaze Chemistry
Pottery glaze chemistry — live UMF, per-oxide limit warnings, materials library, cone reference.
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Trace: Soap & Lye Calculator
Cold-process soap chemistry — SAP-based lye and water for any oil blend, superfat, and a cure tracker.
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Hide: Leathermaker's Calc
Leatherworking math — saddle-stitch SPI by leather weight, thread length, and edge/glue/dye amounts.
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Temper: Knife Heat Treat
Knife heat-treat schedules — quench and temper targets by steel, with a tempering color/HRC reference.
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Wick: Candle Maker's Calc
Candle-making math — wax and fragrance weights by vessel, wick sizing, and per-candle cost.
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Lumen: Red Light Calculator
Red-light therapy dosing — J/cm² by device and distance, with biphasic-window guardrails from the research.
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Marker: Longevity Bloodwork
A longevity bloodwork log — ApoB, Lp(a), hsCRP, HbA1c and more against cited optimal ranges, with trends.
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Watt: Solar for Van & RV
Off-grid solar sizing — battery bank, panel count, wire gauge, and fuse sizing for van, RV, or cabin.
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Well: Off-Grid Water Calc
Off-grid water sizing — well drawdown, pump total dynamic head, pressure-tank cycling, and UV disinfection dose.
Coming soon
More single-purpose calculators in review or on the way: Bath (sous vide), Cure (food dehydrating), Curd (cheese making), and Steam (sauna dose).