Comparison

Twixt Time vs Slate

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Twixt Time

This app helps you track the long-term accuracy of your watches and clocks. By taking precisely timed photos of your timepiece's dial, it analyzes the time displayed against internet-accurate servers to calculate its rate and cumulative gain or loss.

Highlights
  • Track watch and clock accuracy
  • Precisely timed dial snapshots
  • Analyze rate and cumulative gain/loss
  • Supports various dial configurations
  • Automatic timezone monitoring
  • Works with GMT and chronograph watches
Features
Read full description

Twixt Time helps track the longterm accuracy of watches and clocks, by collecting & analyzing precisely timed snapshots of their dials. Use Twixt Time to take a picture of the dial of an analog clock or watch. Each picture captures the exact time displayed on the dial. Twixt also notes the precise instant that the each snapshot was taken, by communicating with highly accurate NTP timeservers on the Internet. A new snapshot of each timepiece can be added everyday. Using the information from 2 or more snapshots of the same timepiece, Twixt will calculate and show you how precisely the watch or clock is keeping time. Twixt tracks the most recent rate, overall average rate, and cumulative gain or loss for each timepiece. Supported dial configurations: * Hour & minute hands with a central seconds hand * Hour & minute hands with seconds displayed in a subdial * Hour & minute hands only Does Twixt Time work with GMT watches? Yes. Twixt Time does not need to track the 24 hour hand of GMT watches to measure their precision. It is only necessary to track the hour, minute, and second hands. For GMT watches with central seconds, select the "central seconds" layout. For GMT watches with an offset or subdial seconds hand, select the "subdial seconds" layout. Twixt Time automatically monitors timezone changes based on the timezone setting of the iPhone or iPod touch. Does Twixt Time work with chronograph watches? Yes. The chronograph functions of a watch do not need to be measured to track the precision of the watch. Twixt Time tracks the precision of chronographs, as well as watches with other complications, in the exact same way that it tracks the precision of a normal, time-only watch. If the central seconds hand can be stopped and reset with the chronograph function, select the "subdial seconds" layout to track the small seconds hand with Twixt Time. If the central seconds hand continues to move when the chronograph is stopped, but the small seconds hand stops, select the "central seconds" layout to track the central seconds hand with Twixt Time. Most chronographs will use a subdial seconds layout. Does Twixt Time work with watches that have an offset seconds hand? Yes. For watches with a second hand that is not concentric with the hour and minute hands, select the "subdial seconds" layout. Does Twixt Time work with quartz watches and clocks? Or other watches and clocks that are powered by batteries? Yes. Twixt Time works with battery powered watches and clocks that display the time with an hour, minute, and/or second hand. It does not work with watches or clocks that only display the time digitally. ---------- Twixt Time is not affiliated with or endorsed by any watch or clock brand. The timepieces shown are for demonstration purposes only.

About

Slate

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Every dive tells a story. Slate keeps the record. Slate is a professional dive logbook for iPhone. Log dives manually, import wirelessly from your dive computer, track your career stats, and export your data whenever you want. Your logbook, your device, your data. DIVE LOGGING - Manual entry: depth, duration, temperature, gas mix, gear, buddy, rating, GPS coordinates, and notes - Air, nitrox, and trimix gas logging with full mix details - Gear configuration tracking per dive - GPS-tagged dive sites - Star rating and personal notes DIVE COMPUTER IMPORT - Wireless Bluetooth import from Shearwater, Suunto, Mares, Oceanic, and more - UDDF file import for any computer that exports the format - Depth profile data preserved from each download - Incremental sync: only new dives are transferred - Multi-computer support: one logbook, every computer you own CAREER DASHBOARD - Total dives, total bottom time, deepest dive, career milestones - Personal bests across your entire logbook - Dive frequency heatmap - Depth and temperature trend charts over time - On-device analysis surfaces patterns across your dives (iPhone 15 Pro and later) SEARCH AND EXPORT - Full-text search across your entire logbook: sites, buddies, notes, gear - CSV and UDDF export, always free, no restrictions - Backup and restore your complete logbook LOCAL-FIRST DESIGN - No account required. No cloud dependency. No server storing your dives. - Your data stays on your device. Period. - iCloud backup compatible for device migration - Works offline at any dive site FREEMIUM DONE RIGHT - Log every dive for free. No dive limit, no trial period. - Slate Premium unlocks career analytics, trends, on-device analysis, and advanced features. - Slate Premium (Annual): $29.99/year, auto-renewing. - Slate Premium (Lifetime): $79.99, one-time purchase. - No ads. No data collection. No account wall. APPLE HEALTH INTEGRATION - Imports underwater depth and water temperature data from Apple Watch dive sessions via Apple Health. - Read-only: Slate does not write data to Apple Health. Slate is agency-neutral. Whether you trained with PADI, SSI, TDI, NAUI, GUE, BSAC, or CMAS, your logbook works the same way. Available in English, Spanish, French, German, Japanese, and Italian. Privacy Policy: https://toolsfordivers.com/privacy Terms of Use: https://toolsfordivers.com/terms/ EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ A Tools for Divers, LLC product.

Screenshots

Twixt Time4 screens
Slate4 screens

Verdict

The call

The clearest difference is price: Slate at Free against Twixt Time's $9.99. Slate also leads on update cadence (weekly vs every 2 months). Twixt Time's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 26.0). On ads 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

CostPrice · In-app purchases · Ads · Monetization

Slate is free to download; Twixt Time costs $9.99 up front. Slate sells 2 in-app purchases, starting at $29.99 per year. Twixt Time asks for nothing beyond the download.

UpkeepUpdate frequency

Twixt Time ships an update every 2 months, Slate weekly. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
Twixt Time versus Slate: the parameters behind the verdict, then further details
ParameterTwixt TimeSlate
Price$9.99Free — better
Rating3.9 (14 ratings) — better—
Positive reviews39.0% of reviews—
Number of ratings14 — better—
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPod — betteriPhone
Requires iOS12.0 — better26.0
Further details — not scored
Size3 MB16 MB
Age rating4+4+
DeveloperColdflower Design Corp.Tools for Divers, LLC

Bugs and requests

Twixt Time

Reported bugs

19 issues
  • Always displays 12+ hrs
  • Crashes constantly
  • App crashes every time you try to take a picture
  • App crashes when resizing a picture
  • Camera takes forever to come on or just does not
Show 14 more
  • Errors: hands not synchronized, internet not available
  • Unable to verify time errors
  • Camera function works much slower than native
  • Shutter does not open for the first picture
  • App cannot associate the correct time
  • App is fiddly to align hands manually
  • App reports variances of several minutes on watches running +/- 6 secs
  • App reports losing 1.2 minutes per day when actual is -1s/day
  • App does not work with separate second face
  • App has regressed, used to work
  • App struggles to discern minute points
  • App doesn't seem to be able to access camera
  • App accuracy affected by Daylight Savings Time changes
  • App averages +/- seconds by accumulated days instead of total running hours

Requested features

12 requests
  • Ability to export/import timelines
  • Delete a separate timeline
  • Reset button for manual time changes
  • Remove restriction on one snapshot a day
  • Allow manual entry of time
Show 7 more
  • Zoom in for better accuracy
  • Slider to move hands
  • 10-minute spread for marking noon
  • Ditch cute lens effects for speed
  • Allow deletion of individual snapshots
  • Faster entry process
  • Improve screen layout for iPad

Slate

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Twixt Time

No in-app purchases

2 purchases

Slate

Subscriptions1
  • Slate Premium Annual$29.991 Year
One-time1
  • Slate Premium Lifetime$79.99

Questions

Is Twixt Time free?
Twixt Time costs $9.99, with no in-app purchases.
Is Slate free?
Slate is free to download, with in-app purchases available.
Do Twixt Time or Slate have ads?
Neither Twixt Time nor Slate shows ads.
Which is updated more often, Twixt Time or Slate?
Twixt Time ships an update every 2 months, and Slate weekly. Most recently, Twixt Time was updated on October 23, 2026 and Slate on October 24, 2026.

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