Slackwater

Slackwater shows tide curves, slack water and solunar bite windows for the spots you fish, computed on the phone so they work with no signal.

Cost / License

Freemium (Pay once or Subscription)
Proprietary

Origin

United States

Platforms

iPhone
iPad
Apple Watch

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Slackwater information

Developed by
Handler Labs
Licensing
Proprietary and Freemium product.
Pricing
One time purchase that costs $40, and / or subscription that costs $2 per month + free version with limited functionality.
Alternatives
5 alternatives listed
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Supported Languages
- English
- Portuguese
- Spanish

Apple AppStore

Updated Sep 14, 2026
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Slackwater was added to AlternativeTo by Brandon Rodrigues on Sep 4, 2026 and this page was last updated Sep 4, 2026.

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What is Slackwater?

Slackwater is a tide and solunar app for anglers, surfers and boaters. Pick the spots you actually use and it shows the tide curve, the high and low times, slack water, and the solunar windows when fish are most likely to move.

Predictions are computed on the device from NOAA harmonic data, so the app keeps working at the ramp, out on the water, and anywhere else the signal drops.

Best-day rankings, alerts before a window opens, a nearby-stations map and home screen widgets round it out, with an Apple Watch app for a glance at the tide.

Three spots are free. Premium lifts the limit and adds every feature at $24.99 a year, about $2.08 a month, with a 7-day trial, or $39.99 once for lifetime access.

Slackwater

Cost / License

Origin

Platforms

Slackwater