Your spots stay secret. There is no account and no upload; the log is saved in this browser only, with CSV export and a backup file you can restore on another device.
How the stats work
Every catch you log feeds the stats panel. Baits, spots and times of day are counted case-insensitively, so “Jig” and “jig” are the same bait, and the top three of each are shown with their counts. Time of day is grouped into early morning, late morning, afternoon, evening and night. Personal bests keep the heaviest fish of each species, using length to break ties, and a trip is any unique combination of date and spot. Release rate is simply the share of logged fish marked as released.
The numbers become useful surprisingly quickly. After a dozen outings most anglers find that one or two baits account for most of their fish and that their best spot is not the one they visit most. Keep notes on depth, retrieve, wind and tide in the notes field and you will know how to repeat a good day.
Estimating weight without a scale
The girth formula, length × girth² ÷ 800 in inches and pounds, has been used by anglers and guides for decades and works for most fish shapes. When you only have a length, CatchLogBook uses a cube-of-length rule with a divisor set by body shape: about 1,600 for chunky fish such as bass and panfish, 2,700 for trout, walleye and salmon, and 3,500 for long, slender pike and muskie. In metric the calculator converts centimetres to inches, applies the formula and converts the result back to kilograms.
Your spots stay yours
CatchLogBook has no accounts and no server-side storage. Catches are saved in local storage in this browser, so nobody else can see where you fish. Use Download backup to keep a copy or move the log to another device, and Export CSV to open it in a spreadsheet.
Frequently asked questions
What should I record in a fishing log?
At minimum the date, spot, species and bait. Length, weight, weather, water temperature and time of day are what turn a log into useful patterns.
Can other people see my spots?
No. Nothing is uploaded. The log lives in your browser and only leaves it if you export it.
Does it work on my phone at the water?
Yes. The page works offline once loaded, so you can log catches with no signal and they are saved on the phone.
Is CatchLogBook free?
Yes. The fishing log, weight calculator and printable sheets are free with no account.
Where is my log stored?
Only in this browser on this device. Download a backup now and then so you never lose a season.