# BigDose — Vitamin D sun tracker + safety > Vitamin D sun tracker + safety (iPhone/iPad app by Grant Perry.) - Source: https://appshunter.io/ios/app/bigdose/id6781472633 (this page in markdown: same URL + `.md`) - Developer: [Grant Perry](https://appshunter.io/developer/1689489185) - Category: Health & Fitness, Reference - Price: Free - Age rating: 4+ - Requires: iOS 26.0 · 10 MB - Languages: American English - Released: 2026-07-10 - Data updated: 2026-07-28 - User reviews in markdown: https://appshunter.io/ios/app/bigdose/id6781472633/reviews.md ## What is BigDose? Most sun apps pick a lane: vitamin D or sun safety. BigDose tracks both — in real time — so you can get outside with a plan instead of a guess. DOSE YOUR D. DEFEND YOUR SKIN. BigDose is built for people who want vitamin D from the sun and still respect their skin. We combine live Apple Weather, your skin type, sunscreen habits and sun angle to show when conditions are right for UVB — and when burn risk is climbing. YOUR DAILY COMMAND CENTER • Vitamin D window today — a sun-path diagram with Apple Weather sunrise and sunset, your personal D window, total daylight and how today compares to yesterday • Live UV, humidity, cloud cover, hourly and 3-day forecast from WeatherKit at your GPS • Daily sun IU goal with progress from sessions, supplements and food logged separately — no double-counting • Sun risk today when live sessions push past your personal burn threshold • Recommended daily IU tuned to age, skin type and goals LIVE SUN SESSIONS THAT RESPECT BOTH GOALS Start a session when your window is open. BigDose tracks elapsed time, estimated vitamin D toward your daily target and MED (burn risk) used on a live dial. Alerts when session safety is on: • Turn-over near 50% — rotate exposure • Optional Nanny Mode adds wrap-up at 75%, guidance at 95% and a 98% reminder • Stop-now at 100% MED — always, Nanny on or off You always end the session. We never do it for you. DOSE DNA — YOUR PROFILE, YOUR MATH Set Fitzpatrick skin type, typical coverage, sunscreen use, supplement defaults and a blood-level goal in ng/mL. BigDose personalizes session timing, safe max duration and safety alerts to you — not a generic chart. PLAN BEFORE YOU STEP OUTSIDE Session planner shows safe max duration at today’s UV, time to reach your D goal and milestone timeline. First-session guide walks new users through the dial, alerts and how to stop on their terms. PROGRESS THAT CONNECTS INTAKE TO LEVEL Log supplements and vitamin D food sources. Import labs when you have them. Progress estimates how your 25(OH)D trend is moving toward your goal using sun, pills and diet — with honest limits: modeled estimates, not a lab result. History keeps a ledger of sun, supplements and food by day. NOTIFICATIONS THAT MATCH YOUR STYLE Solar event reminders, next D opportunity nudges, optional AM light window alerts and session safety notifications when the app is in the background. Toggle what you want during onboarding or anytime in Settings. Nanny defaults on — turn it off when you want a lighter touch. SMART GUIDANCE, NOT A LECTURE Science tab explains how BigDose thinks about D and burn risk in plain language. Info buttons throughout — tap the (i) when you want context, skip them when you do not. BUILT FOR REAL OUTDOOR DAYS Live Activities keep an active session on your Lock Screen. Home Screen widgets surface today’s plan. Optional Apple Health import. High-contrast UI designed for glare, gloves and one-handed use outside. WHAT BIGDOSE IS — AND IS NOT BigDose is wellness guidance you choose to use. It is not medical advice, not a diagnosis and not a substitute for your clinician. Blood tests remain the source of truth for vitamin D status. Use shade, clothing and sunscreen beyond what any app can model. Whether you are optimizing morning light, chasing a short mid-day window or logging a supplement on a rainy day, BigDose helps you dose your D and defend your skin — same app, same dashboard, no false tradeoff. We ship often and read every report. Thanks for helping us make BigDose sharper every build. ## Version history (last 4 releases) ### 1.28.6 — 2026-07-14 Sun Session goal editing — without stopping Change your IU goal during an active sun session with a new live slider Tap Goal in the session info row or the % / IU summary under the dial The progress ring, time remaining and Live Activity update as you adjust Quick preset chips for 600, 1000, 2000, 4000 and 5000 IU If your goal goes past burn guidance, BigDose shows a caution — MED (burn risk) still tracks separately and only you stop the session Fixed an issue where the goal editor sheet might not open during a session Have a blast and please, keep bug reports coming! Gp. ### 1.28.5 — 2026-07-12 BigDose 1.28.5 tightens the numbers you rely on for vitamin D sun tracking. • Ending a sun session from the Lock Screen or the app now saves your session first, so tracked IU is not lost • Live Activity pause, resume and end stay in sync with the timer — no inflated or missing minutes • History “Last 90 Days” totals finally match the last 90 days • Daily goal remaining minutes account for supplements (and food) when those count toward your total, and sunscreen habits lengthen remaining-time estimates • New sun sessions aim at the sun IU you still need today, not a full reset of your daily target • Sessions that cross midnight split cleanly across days • Apple Health outdoor workouts that overlap a tracked BigDose session are skipped so the same time is not counted twice • Auto daily supplements no longer stack on top of a dose you already logged • Lab reminders are anchored to your latest lab (not forever postponed on every refresh) • Profile photo removal can be saved; Clear All resets Apple Health import status; onboarding no longer dismisses before setup finishes • Active session Skin and Clouds controls work again Have a blast and please, keep bug reports coming! Gp. ### 1.28.4 — 2026-07-11 BigDose is built for vitamin D sun tracking — live UV, your D window and skin-safe session timing. This update focuses on making active sun sessions easier to read and control when you are actually outside. Active Sun Session Redesign New instrument-style dial in dark mode and a clean daylight layout in light mode Larger timer, IU progress and goal summary at the top Burn risk, MED and roll-over timing in a dedicated metrics row Bigger Pause, Resume and Stop buttons fixed at the bottom of the screen Light and Dark Mode Sun/moon toggle on the home screen and during an active session Your choice is remembered across launches Clearer Alerts Outdoors Session alerts use solid backgrounds instead of translucent glass Dark mode alerts flip to white with black text for maximum contrast in sunlight Stop confirmation shows estimated IU with comma formatting (e.g. 1,448 IU) Faster Start Flow Dashboard goal dial now shows START / NEW beneath the ring Tapping the dial goes straight to the sun session planner — no extra picker step Other Fixes Weather row no longer clips UV text on narrow layouts Safety notifications pause while your session is paused Have a blast and please, keep bug reports coming! Gp. ### 1.28 — 2026-07-10 No release notes. ## More apps by Grant Perry - [ToeSteps](https://appshunter.io/ios/app/toesteps/id6503917352) - [BigWrd](https://appshunter.io/ios/app/bigwrd/id6758681696) All apps by Grant Perry: https://appshunter.io/developer/1689489185 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-28.*