Slinging.org Forum - (Free) Slinging Logbook App Project

irgendeinekiwi

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(Free) Slinging Logbook App Project
Jan 30^th, 2026 at 3:06pm

Hi guys,

I've been cobbling together an app for tracking slinging sessions and comparing slings. At the moment it's browser based, eventually I'd like to get it on the app store (if I can figure out how to)

Current features:
-Session setup with sling type, range, ammo type & weight
-Tally based tracking of dianas, hits, misses etc
-Create up to 30 different sling profiles (type, cord material, length etc) and 10 private test profiles
-Session history, sortable stats
-leaderboards with various filters to see who's the best, what sling type is giving the best results etc

You can give it a test for free over at https://blackthorn.base44.app/ It works best if you use the "save to homescreen" function on your mobile browser.

Please don't hesitate to share any suggestions or feedback

I'm also open to ideas for a proper name for the app

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« Last Edit: Oct 2^nd, 2026 at 11:44am by irgendeinekiwi »

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Slings and Glandes Moulds
https://blackthornballistics.etsy.com
-> https:/blackthornballistics.com <- New Website

Free Slinging app: https://blackthorn.base44.app/

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erricrice

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Re: Slinging App Project
Reply #1 - Jan 30^th, 2026 at 3:37pm

Hey looks great! I actually went through a process to create something like this myself using google sheets and forms, but the google forms options were too cumbersome so in the end I just have a spreadsheet where I enter the data I want using the google sheets mobile app.

This looks like it would be much better to work with Grin

I haven't had a chance to check out the app yet, but from your screenshots it looks pretty complete! I'll download it shortly and start playing with it.

A couple of things come to mind you might consider, although I certainly wouldn't say any are required:

Add a weight field to the sling profile
Add a practice/competition option for slinging sessions so you can compare how you do at home vs in competition
In addition to an accuracy percent, you might consider normalizing this calculation to an average points and dianas per 5 throws(the traditional balearic round) - so for example, an average 3.55 points and 1.25 dianas.
Maybe an option to export everything for us data nerds that like to overanalyze everything

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irgendeinekiwi Descens Offline Posts: 174 Europe Gender:	Re: Slinging App Project Reply #2 - Jan 30^th, 2026 at 7:57pm Done Added: - weight as optional profile field - D / H per 5 shot stat display - Abilty to flag a session as competition (on stats page), will have to intergrate its function better
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erricrice

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Posts: 547
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Re: Slinging App Project
Reply #3 - Feb 3^rd, 2026 at 10:47am

Alright I got to spend a couple minutes with it just now, and it's awesome! I'll try using this for a little while and see how I like it. The leaderboard is a great idea to keep people competitive.

I also have some more feedback. Some of this may be personal to me, so don't take this as law, but anyways here it is:

Allow sessions to be backdated so that you can enter them later if you forget, but they will still be reflected correctly on the charts.
Track time of day if you aren't already, and allow that to be entered for a backdated session(but by default when adding a new session, populate the current date/time). I often do multiple sessions in a row and wouldn't want to have to stop to log them in between.
Add a list view of individual sessions with the various tracked stats, sort of like a table view.
Allow total numbers to be entered directly into the session input. Keep the plus/minus, it's great for small sessions. But I usually do ~100 at a time, so clicking that plus a hundred times is no fun
Replace "Hits" with "Points". Points would include dianas(+2). I think this makes more sense to focus on rather than hits because this is how competitions are scored. Fewer individual numbers to remember when entering. I would recommend doing the same on the stats page - "points per 5" rather than "hits per 5" since that's how competitions are scored.
Add a "total throws" field in session input. Again, this may be personal but I only track three things - throws, points, dianas. The rest can be calculated from that if you want it.
That being said, I have seen some folks that keep score by misses and dianas, then tally up their actual score at the end from that. So you may want to support entry on any of the fields and then automatically do the math for all the others. Although that could lead to some complicated validation logic when submitting the session, so I'll leave that up to you whether you care enough to tackle that.

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irgendeinekiwi

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Re: Slinging App Project
Reply #4 - Feb 3^rd, 2026 at 12:12pm

Thanks for the ideas.

It should be easy enough to change the H/D per 5 to a competition points based thing. I'll see how much of the other points I work in, particularly the counter mod and backdating. In think there are already time stamps on the sessions

Fyi the "misfire" tally stems from my idea to collect reliability data on the various slings people may use. Ideally the app would serve the double purpose of providing sort of empirical data to see if there are statistically significant differences in the effect of different pouches/lengths/sling types. Of course there are a bunch of caveats, but I think it could be interesting.

I was thinking of having the option of different target types (cinder block, pumpkin/melon etc )which wouldn't flow into the above comparison stats. Not sure how best to do that without even more options on the session setup dropdown.

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Slings and Glandes Moulds
https://blackthornballistics.etsy.com
-> https:/blackthornballistics.com <- New Website

Free Slinging app: https://blackthorn.base44.app/

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irgendeinekiwi Descens Offline Posts: 174 Europe Gender:	Re: Slinging App Project Reply #5 - Feb 5^th, 2026 at 8:26am What do you think about a slider in the settings tab to toggle between tally and manual score entry?
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erricrice Funditor Offline reformed spaghetti enthusiast Posts: 547 Clearwater, FL	Re: Slinging App Project Reply #6 - Feb 5^th, 2026 at 9:58am Sure, makes sense to me! For smaller sessions, the tally is probably easier so it would be good to offer both.
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irgendeinekiwi Descens Offline Posts: 174 Europe Gender:	Re: Slinging App Project Reply #7 - Mar 2^nd, 2026 at 4:03am I've updated the app with most of those suggestions- let me know wgat you think
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erricrice Funditor Offline reformed spaghetti enthusiast Posts: 547 Clearwater, FL	Re: Slinging App Project Reply #8 - Mar 2^nd, 2026 at 9:00am Nice thanks! Yeah works great. I also like the target selection, good addition!
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irgendeinekiwi

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Re: Slinging App Project
Reply #9 - Sep 10^th, 2026 at 12:23pm

Now that I'm training regularly I've been working on decluttering the app, seen as noone ended up using the additional targets etc.
The goal is to have minimal faff before one can start logging shots.

Updated:
Target selection now Traditional(Balearic) and Other
Challenges and info tab removed
More detail on past session list

Coming soon:
Faster session setup that remenbers previous settings
Clearer Stats tab
New UI/Colour pallette
Possibly the ability to use it without signup

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Slings and Glandes Moulds
https://blackthornballistics.etsy.com
-> https:/blackthornballistics.com <- New Website

Free Slinging app: https://blackthorn.base44.app/

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erricrice Funditor Offline reformed spaghetti enthusiast Posts: 547 Clearwater, FL	Re: Slinging App Project Reply #10 - Sep 10^th, 2026 at 1:11pm Hey sorry for the gap! I'll give this new version a try. I was using this pretty regularly, but made a big technique change so I didn't bother tracking stats during that time. I'm back in my normal range now so I'll start logging here again.
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irgendeinekiwi Descens Offline Posts: 174 Europe Gender:	Re: Slinging App Project Reply #11 - Sep 10^th, 2026 at 5:16pm All good. I might add a quick way to select/note the slinging style too
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irgendeinekiwi Descens Offline Posts: 174 Europe Gender:	Re: Slinging App Project Reply #12 - Sep 16^th, 2026 at 6:55am Update: -Stats page now has a competition points projection, based on last two sessions. Now there's a small bug in the rest of the stats, but I'll fix that soon. -App can now be used without requiring sign in (guest mode)
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Pocket rock.et Descens Offline Slinging Rocks! Posts: 133 Gender:	Re: Slinging App Project Reply #13 - Sep 16^th, 2026 at 1:37pm irgendeinekiwi wrote on Sep 16^th, 2026 at 6:55am: -App can now be used without requiring sign in (guest mode) 👍👍👍 I don't know why I didn't see this topic earlier — great idea and productive work!
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irgendeinekiwi

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Re: Slinging App Project
Reply #14 - Sep 20^th, 2026 at 7:02pm

Changes:
The UI for the session setup has been reworked
+Autofills the setups of the last session to save having to set up from.scratch every time
+ added sling style as an optional extra to track
+bug fix on stats page, found a new bug with the sling list...

In terms of actually using the app, I've found tallying in 10 shot increments/rounds to be a good way to track directly into the app, without interrupting the flow of the session too much. I'll add a total shots entry to the tally counters too, so the misses will autofilled like with the manual entry screen.

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Slings and Glandes Moulds
https://blackthornballistics.etsy.com
-> https:/blackthornballistics.com <- New Website

Free Slinging app: https://blackthorn.base44.app/

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