ChronoLog vs SpawnLog
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ChronoLog
This app provides professional-grade tools to track the accuracy of mechanical watches. It offers audio timegraphing, photo offset measurement, and tap timing, along with detailed analytics and atomic time synchronization for collectors and enthusiasts.
- Audio timegrapher for rate, beat error, and amplitude
- Photo offset measurement against atomic time
- Tap timing for quick offset logging
- Track accuracy trends over time
- Atomic time synchronization
- Detailed performance graphs and analytics
- Manage and organize watch collection
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ChronoLog — Watch Accuracy Tracker & Audio Timegrapher for Mechanical Watches Track the accuracy of your mechanical watches with professional-grade tools. ChronoLog combines an audio timegrapher, offset measurement logging, and atomic time synchronization into one app — purpose-built for watch collectors and horology enthusiasts who care about precision. No subscription. No account. One-time purchase unlocks everything. MEASURE WATCH ACCURACY — THREE WAYS • Audio Timegrapher: Use your device's microphone to listen to your watch's tick and measure rate (seconds per day), beat error, and amplitude — the same metrics a professional timegrapher provides. • Photo Offset: Photograph your watch dial against atomic time, enter the displayed time, and ChronoLog calculates the exact offset. The most precise manual method for measuring watch accuracy. • Tap Timing: Tap when your watch hits a specific second to quickly log an offset. Fast, simple, and works with any watch. TRACK ACCURACY OVER TIME Each measurement is logged to a timing run — a series of readings that ChronoLog analyzes together. Monitor your watch's daily rate, see how accuracy changes day to day, and spot regulation issues before they become problems. Tag measurements with conditions like position, temperature, or wear pattern to understand what affects your watch's performance. ATOMIC TIME SYNCHRONIZATION ChronoLog syncs with NTP atomic time servers so every measurement is referenced against true time — not your phone's clock. View the live atomic time, compare it to your device, and use it as a precision reference when setting your watches. DETAILED ANALYTICS & VISUALIZATIONS Dive into performance graphs that show rate trends, offset history, and accuracy patterns across your entire collection. See at a glance which watches in your collection are your most accurate daily wearers and which need regulation or service. BUILT FOR WATCH COLLECTORS • Add unlimited watches with photos, brand, model, serial number, caliber, and notes • Organize your collection with archive support • Export all measurement data to CSV for your records or your watchmaker • Back up and restore your full database across devices WHY CHRONOLOG? Whether you're a seasoned collector checking COSC-grade accuracy, a hobbyist curious about your Seiko's daily rate, or a watchmaker tracking regulation results — ChronoLog gives you the tools to measure, log, and understand your watch's timekeeping performance. Built by a watch enthusiast in Boulder, Colorado. Download ChronoLog and start measuring your watch accuracy today.
SpawnLog
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The mushroom grow tracker built to replace your spreadsheet — and fix everything wrong with the other apps. Every flush logged. Every harvest weighed. BE% calculated automatically. No locked logs, no subscription, no cloud required. 【What You Can Do】 ▷ Batch Tracking Log every batch from inoculation day: species, strain, substrate type and weight, inoculation date, notes, and photos. The batch card shows total harvest, flush count, days running, and current BE% at a glance. Free up to 5 active batches. ▷ Flush Log & BE% — Always Free Record flush number, harvest date, wet weight, and dry weight. SpawnLog calculates BE% (biological efficiency = wet weight ÷ dry substrate weight × 100) automatically — the metric every serious grower tracks. Every log is fully editable and deletable. No locked entries, ever. ▷ Contamination Log Record contamination type (green mold / wet rot / bacterial blotch / cobweb mold), stage (grain or bulk), date, discard status, and photos. Stay on top of what's failing and why. ▷ Harvest Share Cards — Free (with watermark) Tap share on any flush. A stats card is generated instantly: strain name, flush number, wet weight, dry weight, BE%, days since inoculation, and your harvest photo. Share it to Reddit, Discord, or Instagram. This is the card that makes other growers ask "what app is that?" SpawnLog Pro removes the watermark. ▷ Substrate Calculator — Always Free Two calculators built in: (1) Water Calculator — enter dry substrate weight and target moisture %, get exact water to add. (2) Spawn Rate Calculator — enter substrate weight and spawn rate %, get spawn weight. No more running Shroomery spreadsheets. ▷ Stats Charts (Pro) Bar charts for total harvest by batch, BE% by batch, and flush-by-flush yield trends. Contamination rate breakdown. See which strains and methods consistently win. ▷ Recipe Library (Pro) Save your substrate mixes with ingredient list and spawn rate. Link recipes to batches. Never forget what you used in that record-breaking run. ▷ Export & Import — Always Free Export batch and flush data as CSV, or as a ZIP that includes photos, notes, contamination logs, and recipes. Import a CSV or ZIP anytime from Settings → Data to add records back. Compatible with Sheets, Excel, and Obsidian. 【Who It's For】 · Home growers managing multiple batches who've outgrown paper and spreadsheets · Anyone who's ever asked "what was my BE% on that oyster run last month?" · Growers who post harvest results on r/MushroomGrowers, r/unclebens, or Shroomery · Growers who want their logs on their phone, not in some startup's cloud 【Your Data Stays on Your Device】 Everything is stored locally on your iPhone using SQLite. Nothing is sent to external servers. No account required. No subscription. No risk of losing your grow history if a service shuts down. 【Pricing】 · Free: 5 active batches, flush logs, contamination logs, BE% calculation, substrate calculator, CSV/ZIP export & import, and share cards (with SpawnLog watermark). · SpawnLog Pro (one-time $6.99): Unlimited active batches + stats charts + recipe library + watermark-free share cards. Pay once, yours forever. ---------------------- Developer: Kore Apps Contact: support@kore-apps.com ----------------------
Screenshots
Verdict
The clearest difference is update cadence: SpawnLog at every 9 days against ChronoLog's every 3 weeks. ChronoLog's advantage is iOS requirement (13.0 vs 16.0). 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. ChronoLog sells 2 one-off in-app purchases and SpawnLog sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
ChronoLog ships an update every 3 weeks, SpawnLog every 9 days. The most recent releases landed on October 13, 2026 and October 1, 2026 respectively.
| Parameter | ChronoLog | SpawnLog |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (204 ratings) — better | — |
| Positive reviews | 84.8% of reviews | — |
| Number of ratings | 204 — better | — |
| Update frequency | Every 3 weeks | Every 9 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 49 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | tyler wood | kazuki korenori |
In-app purchases
ChronoLog
- Premium$5.99
- Premium$6.99
SpawnLog
- SpawnLog Pro$6.99
Questions
Is ChronoLog free?
Is SpawnLog free?
Do ChronoLog or SpawnLog have ads?
Which is updated more often, ChronoLog or SpawnLog?
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