Offline reference for watch enthusiasts
DialTrue Watch Lab turns complications into hands-on practice. Twelve illustrated lesson packs, a draggable dial bench, a horology glossary, wrist-fit and water-resistance desks, a service-interval planner and a shuffled mastery quiz — all seeded on the device and working with the network switched off.
Section 02 — What the app is
Most watch apps show you pictures of watches. DialTrue Watch Lab teaches you to read them. Every module is built around one idea: you understand a complication when you can point at each element on the dial, name it, and explain the reading order out loud. The app gives you four tabs that walk that path from first glance to confident mastery.
Seeded lesson packs for chronograph, GMT, dive, moonphase, annual calendar, field, dress and core three-hand layouts. Filter by family or difficulty, bookmark what you are working on, open full-text search across lessons and glossary.
A drawn dial stage where you drag labelled callouts onto hands, subdials, bezel pips and moon apertures. Grid snap, scale and rotate sliders, z-order control, undo/redo and a plain-text export of your layout.
Architecture cards for quartz, automatic, hacking seconds, power reserve and GMT modules, plus the glossary, illustrated care guide, water & crystal desk, wrist-fit advisor and service-interval planner.
Shuffled question banks with instant rationales after every answer and a score breakdown per complication family, so you see exactly which topic needs another pass.
Start from the family you actually own or want to buy next.
Summary, difficulty, highlighted dial elements and a short body text with reading order.
Place callouts yourself until the layout is muscle memory.
Rationales explain the “why”, not just the right option.
Section 03 — Interactive benches
The bench is the heart of the app. Each lesson opens a hand-drawn dial matching its type — chronograph, GMT, diver, moonphase or a plain three-hand plate — with default markers seeded in the anatomically correct positions. You can move them, add new ones, scale and rotate, then reset to the seeded layout whenever you want to compare your reading with the reference.
Section 04 — Lesson packs & movement library
Each pack carries a family tag, a difficulty level, the list of highlighted dial elements and a compact body text you can read in under a minute. Bookmarks keep your current curriculum on top; search matches both lesson bodies and glossary definitions.
| Lesson pack | Family | Level | What you take away |
|---|---|---|---|
| Three-hand automatic readout | Core | Beginner | Read minutes first, then hours; running seconds confirm the movement is alive. |
| Chronograph subdials | Chronograph | Intermediate | Sweep seconds, 30-minute counter, 12-hour totalizer, tachymeter conversions. |
| GMT dual-time | GMT | Intermediate | Local vs home hour, 24-hour scales, jump-hour modules for travel. |
| World-time city rings | GMT | Advanced | Aligning the city disc and avoiding AM/PM mistakes on long-haul flights. |
| Rotating dive bezel | Dive | Beginner | Why unidirectional rings can only shorten remaining time. |
| Moonphase disk | Calendar | Beginner | Aperture windows, 29.5-day gearing, setting after long stops. |
| Annual calendar overview | Calendar | Advanced | Month, date and day windows that need one correction after February. |
| Field tritium markers | Field | Beginner | Fixed lume plots, railroad tracks, matte anti-glare dial grammar. |
| Dress regulation basics | Dress | Advanced | Beat error and amplitude cues; track rate trends, not single days. |
| Quartz vs automatic | Movement | Beginner | Stepper seconds, rotor winding, 38–72 h reserves, service cadence. |
| Hacking seconds & sync | Movement | Intermediate | Stop-seconds crowns and clean multi-watch synchronisation. |
| Power-reserve indicators | Utility | Intermediate | Arc and linear gauges that warn before a mechanical watch stops. |
Fourteen searchable definitions — lug-to-lug, tachymeter, hacking seconds, unidirectional bezel, sapphire, mineral and acrylic crystals, power reserve, ISO 6425, screw-down crown, amplitude, annual calendar, moonphase and the GMT hand. Long-press any term to copy it or share a study sheet; tapping jumps straight to the related lesson.
Five habit cards on magnetism awareness, correct crown operation order, spring-bar safety during strap changes, storage orientation after a full wind, and travel routine — hack and sync before a flight, then pack in a padded roll away from magnets.
Section 05 — Practical desks
Three calculators and reference desks cover the questions that come up before a purchase and after it: will this case sit on my wrist, can I take it in the water, and how often should it be looked at.
Set your wrist circumference (140–210 mm) and how much overhang you tolerate (0–12 mm). The advisor returns a target lug-to-lug band, a case-diameter range and a strap or bracelet note — tapered straps and micro-adjust clasps for smaller wrists, rubber or NATO for sports use on larger ones. Profiles are saved locally and can be shared as plain text.
Four depth classes explained in plain language, three crystal materials with their honest trade-offs, three crown types, and a scenario helper for desk day, hot shower, pool swim and ocean day. The desk is explicit that consumer “swim” ratings are not diver certification.
Choose a usage profile, name the plan, and get an inspection window plus a checklist. Desk weekdays run 48–72 months with rate, crown, gasket and magnetism checks; dive weekends tighten to 12–24 months with pressure test, crown seating, bezel clicks and a salt rinse.
| Water class | Rating | Meaning in the app |
|---|---|---|
| Splash | 30 m | Hand wash is fine; not for swimming. |
| Swim | 50–100 m | Recreational swimming with the crown secured — not diving. |
| Snorkel | 150–200 m | Surface water sports; still not an ISO 6425 diver. |
| Diver ISO 6425 | 200 m + | Certified dive use with sealed crown and tested gaskets. |
| Usage profile | Interval | Checklist theme |
|---|---|---|
| Desk weekdays | 48–72 months | Rate check · crown feel · gasket visual · magnetism sweep |
| Commute automatic | 36–60 months | Bracelet stretch · clasp security · crystal inspection · accuracy log |
| Field hobby | 24–48 months | Shock check · spring-bar safety · lume integrity · dust under crystal |
| Dive weekends | 12–24 months | Pressure test · screw-down crown · bezel clicks · rinse after salt |
Section 06 — Mastery quizzes & daily tips
The quiz bank is shuffled on every run and spans chronograph, GMT, dive, calendar, fit, water, movement, materials and service topics. Correctness is never the end of the interaction: each question reveals a short rationale that explains the mechanism behind the answer, and the results screen breaks your score down per family so revision is targeted rather than generic.
“On a classic tri-compax, which counter usually tracks elapsed minutes?”
Rationale: the larger subdial marked to 30 accumulates chrono minutes while the central hand sweeps seconds.
Overall score plus per-family accuracy, so a weak Calendar section stands out immediately.
Chronograph
GMT
Calendar
Materials
A daily dial-reading tip rotates on your home screen through scheduled background work — no foreground service, no battery drain, no network call.
From “read chronograph minutes before hours” to the difference between an ISO 22810 swim rating and ISO 6425 diver certification.
Settings can restore the original seed pack in one tap if you want a clean slate for benches, plans and bookmarks.
Section 07 — Offline design, appearance & accessibility
The app ships without internet access. Content is seeded into a local database on first launch, so lessons, benches, glossary and quizzes work in a plane, a basement or on airplane mode.
There is no sign-up, no email capture, no analytics identifier and no advertising SDK. Nothing about your reading habits leaves the phone.
Saved fit profiles, service plans, bookmarks and bench layouts live in the app’s private storage. Delete individual entries, reset the seed pack, or uninstall to remove everything.
System, light and dark modes with a charcoal-and-brass palette tuned for contrast. Screen elements carry accessibility labels, and layouts scale with the system font size.
Section 08 — Support
DialTrue Watch Lab is maintained by a small independent team, and support is handled directly by the developer — no ticket queues, no chatbots. Write to us in English or Ukrainian and you will normally hear back within one business day, and always within three. Bug reports, feature requests, content corrections and horology nitpicks are all genuinely welcome; several lesson packs exist because a user asked for them.
No to both. All lesson packs, glossary terms, quiz questions, default bench markers and daily tips are seeded into a local database the first time you open the app, and it requests no network access whatsoever. There is no registration, no login and no cloud sync, which also means nothing to leak and nothing to subscribe to.
Each lesson has a seeded set of markers placed in anatomically correct positions. If you have dragged things around and want the reference back, open Settings and tap “Reset offline seed pack”; this restores the original lesson packs, glossary, quiz bank and default bench markers. Note that the reset also clears your own bookmarks, saved fit profiles and service plans, so export or note anything you want to keep first. Inside a bench session you can also step backwards through your changes with undo instead of doing a full reset.
The advisor gives a comfort band derived from your wrist circumference and your stated overhang tolerance, and it deliberately weights lug-to-lug over case diameter, because the distance between strap attachment tips is what pushes past the edge of your wrist. Treat the output as a starting range for shortlisting, not a verdict: wrist shape (flat versus round), case-back curvature and strap thickness all shift the real result. If a watch feels right on the wrist, it is right, whatever the numbers say.
Use it as education, not as certification. The Water & crystal desk explains what the common rating classes normally allow and highlights the difference between a consumer ISO 22810 “swim” rating and a genuine ISO 6425 diver’s watch, but the actual condition of your gaskets, crown and crystal matters more than any printed number. Heat and soap in a shower stress seals even on a highly rated case, and only a pressure test at a service centre can confirm a specific watch is still sealed. Always follow your manufacturer’s instructions.
The bank is reshuffled on every run, so the order and sequence change each time. After each answer you get an immediate rationale explaining the mechanism behind the correct option, and the results screen shows both your overall score and a per-family breakdown across chronograph, GMT, dive, calendar, fit, water, movement, materials and service topics. You can retake it as often as you like from the Quiz tab; scores are for your own orientation and are not uploaded anywhere.
More complications and glossary terms — yes, that is the main direction of development, and requests genuinely shape the roadmap. Brand catalogues, market valuations and price guides — no. The app stays a neutral educational reference about how dials and movements work, with no shopping links, no affiliate content and no advertising, which is also why it can remain fully offline.
Please tell us. Send the exact lesson or term name, the sentence you believe is wrong and, if possible, the correct wording with a reason. Horology terminology varies between traditions and manufacturers, so we review each report carefully and credit corrections in the release notes when a change ships. Content fixes are usually the fastest updates we make.