Spool vs Sol Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Spool
Manage your 3D printing filament inventory with detailed tracking of materials, costs, and stock levels. Log print details, monitor printer maintenance, and gain insights into your printing habits. Integrates with Bambu Lab printers for automatic data logging.
- Filament spool tracking
- Cost and weight logging
- Low-stock warnings
- Print logging and analysis
- Bambu Lab printer integration
- Printer maintenance schedules
- NFC/QR code spool tagging
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You have 40 spools. You're about to start a 12-hour print. How much PETG do you actually have? Spool is precision filament inventory for 3D printing enthusiasts. Track what you have, what things cost, and what's running low. Built by a maker who got tired of guessing. TRACK YOUR COLLECTION Lightning-fast spool entry with auto-fill from screenshots and product URLs. Material, brand, colour, weight, cost, purchase date, storage. Real remaining-weight tracking down to the gram. Low-stock warnings before you find out mid-print. THE HUB Tap the centre tab and a glass command centre opens over any screen. Every major action (add spool, log print, scan SpoolTag, analytics, printers) is two taps away. PRINT LOG & PRINT STORY Every print captures 24 process fields. 20 decoded automatically from your Bambu data: nozzle, layer height, infill, walls, speeds, temperatures, plate, adhesion, supports. Rate every print with 11 failure types, down to the exact layer. Tap any print and a full-screen story opens: costs, telemetry, spool gauges, and every previous attempt side by side. 19 insight cards surface temperature sweet spots, speed ceilings, drying impact, personal bests, and failure patterns. BAMBU LAB INTEGRATION Bambu printers log prints automatically via Bambu Cloud. Free for everyone, no manual entry. AMS multi-material tracked correctly. Smart spool matching learns and auto-selects on future imports. CATEGORIES 17 built-in, unlimited custom. Spool suggests one for every print and learns every override. Category Insights show success rates, costs, and trends so you see which kinds of prints are worth your filament. PRINTER MAINTENANCE Schedules from manufacturer guides for Bambu Lab, Prusa, Creality, Anycubic, Elegoo, Artillery, Flashforge, Sovol, AnkerMake, Qidi Tech, RatRig, and Voron. A live health score per printer. Overdue tasks turn red. Complete one and watch it climb. SPOOLTAG Tap your iPhone to an NFC-tagged spool and everything opens instantly. QR codes work from any camera app. Scan, log print, spool pre-selected. Label Studio designs and prints labels to Dymo, Brother, sticker sheets, or A4. AR Inventory overlays live data above every tagged spool, with Searchlight filtering by brand, material, colour, or status. ANALYTICS & INTELLIGENCE Five dashboards: Pulse, Economics, Energy, Material, and Hardware. Add your electricity rate once and every print shows its true cost, materials and energy combined, to the penny. Nozzle breakdowns, plate comparisons, quality-weighted grades, and variant-aware palettes for matte and silk filaments. WORKSHOP MANAGEMENT Six storage types (shelf, dryer, AMS, box, airtight case, vacuum bag) with humidity and seal date tracking. Shopping list and batch management for multi-packs. START FREE 20 spools, 2 printers, 4 storage locations. 30 days of analytics. Bambu Cloud sync, SpoolTag, AR Inventory, Print Story, Categories, and Printer Maintenance included. No card required. Live counters show where you stand against your limits. GO PRO, £4.99/month or £49.99/year Unlimited spools, printers, and storage. Lifetime analytics. CSV import. Label Studio with thermal exports and sticker sheets. Print Queue for batch production. Plus: full cross-print insight tray, category customisation, maintenance notifications, Home Screen and Lock Screen widgets, and Live Activities. The annual plan works out at £4.16/month and pays for itself in the waste it helps you avoid. SPOOL PACKS Not ready to subscribe? A one-time Spool Pack permanently adds 10 slots to your free account. SUBSCRIPTION & PURCHASE INFO Spool offers a one-time Spool Pack and two auto-renewing subscriptions: Spool Pro Monthly and Yearly. Payment charged to iTunes Account at confirmation. Auto-renews unless cancelled 24 hours before the period ends. Manage in Account Settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://lance-studio.com/privacy.html
Sol Clock
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Sol Clock is a solar time clock connecting you to the rhythm of the sun and moon. Sol Clock shows you where the sun actually is, from nautical dawn through solar noon to deep night. Displayed on a beautifully crafted astronomical clock face inspired by the medieval clocks of Venice and Prague. Sol Clock displays true solar time alongside standard and UTC, so you always know where you stand in the actual solar day, not just the civil one. The Clock The clock face renders a full 24-hour solar day. The hand tracks the sun's position through the light spectrum of the day. The orbital ring shows the complete sky color spectrum for the day. Computed dynamically based on your location and the day's sunrise and sunset times. Sky Map The Sky Map shows an equidistant northern projection center on the North Pole with a live terminator line showing the boundary between day and night. Solar Compass The Solar Compass tracks the sun and moon in real time and shows their current relationship to the Equator and Tropics of Cancer and Capricorn. Events & Alarms Enable notifications for any point in the solar day: Nautical Dawn, Civil Dawn, Sunrise, Golden Hour End, Morning Light, Solar Noon, Afternoon Light, Golden Dusk, Sunset, Civil Dusk, Nautical Dusk, and Night. Each alarm fires at its precise solar time for your location, rescheduling automatically every day.
Screenshots
Verdict
The clearest difference is update cadence: Sol Clock at every 3 days against Spool's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Spool sells 3 in-app purchases, starting at $4.99 per month and Sol Clock sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
Spool ships an update every 2 weeks, Sol Clock every 3 days. The most recent releases landed on July 24, 2026 and September 11, 2026 respectively.
| Parameter | Spool | Sol Clock |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 weeks | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.1 | 26.0 — better |
| Further details — not scored | ||
| Size | 76 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Lucas Melo | Mark Zigadlo |
In-app purchases
Spool
- Spool Pro Monthly$4.991 Month
- Spool Pro Yearly$49.991 Year
- +10 Spool Capacity$0.99
Sol Clock
- Pro Monthly7 Days trial$0.991 Month
- Pro Annual7 Days trial$7.991 Year





