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Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing

numpad.io

21–30 of 31 posts

Re: Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing

#21
post #20

Earlier quoted context omitted.

Mate this is a show HN post, not a "recommend me something" post. Don't be rude.

It doesn't hurt to list alternative products, right? Understanding the competition and lacking features. Mine isn't the only post in this thread mentioning other products that do roughly the same thing.

> It doesn't hurt to list alternative products, right?

Yes it does. Show HN is a very small opportunity for normal ppl to talk about their things.

Re: Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing

#23

Super clean style of interaction regarding the units and general syntax. Regarding the CRDT side of things what's the main driver? Syncing is probably better off without CRDT (I'd rather know a note had 2 copies significantly edited differently and now I have a sync conflict rather than no sync conflict but a hacked up note) so I'm assuming paid customers get (or will soon get) live multi user editing (i.e. you can t…

Yes exactly, I had live multi-user editing as a feature until just before launch. In the end it needed a bit more work though, so I had to pull it.

Re: Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing

#24
post #16

I use Numerals(1) in Obsidian for this, and it works great. It's built on mathjs(2) and has things like @total functions which automatically sum all uninterrupted lines above it. 1 https://github.com/gtg922r/obsidian-numerals 2 https://mathjs.org/

Mate this is a show HN post, not a "recommend me something" post. Don't be rude.

Honestly, I don't mind. It's useful to know about alternative products, and I hadn't heard about this one. Thanks all the same though :)

Re: Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing

#26

How do I do get the right result when trying: 200Mbps * 2hours? I get "400 Mbits/s hr" and that's not what I'm looking for. It seems to be working if I use seconds instead. 200Mbps*2s=400 megabits

`200 Mbps * 2 hours in Mb` the second one works because the derived unit of the calculation works out to be exactly the same as a megabit, but that's not the case for the first one so you have to convert manually.

Re: Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing

#28
post #15

The interface looks great. Handling of "to" is a bit odd though. 150 kn in km/h [277.79976 kph] - this is unit convertion 150 kn to km/h [-276.79976 kph] - this is unexpectedly subtraction. I expected the unit conversion here, because of Raycast and Google

Yeah, this was a deliberate decision, but a tough one and I can see why you might find it annoying. I think it makes date and time calculations more readable:

09:11 to 15:46

Re: Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing

#29
post #6

Nice tool, but the calculator executes division before exponentiation. E.g. 2^4/2 is evaluated to 4, not 8. However, it executes exponentiation first before multiplication (e.g. 2^2*3 is evaluated to 12). Is this intentional?

This is intentional, even if unexpected, as shown in line 152 of the link (turn on line numbers in the settings menu). I agree that following PEMDAS would make more sense. Edit: it's the equation below "Although if you want to find roots higher than 3..."

Yeah, you're correct, it's intentional. Though it's pretty gross to be honest.

Re: Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing

#30

This is really cool. I’m not sure what I would ever use it for, but it’s a cool idea and seems well executed.

I don't mean this as a knock on OP, but it's not a new idea — I think the best known apps in this category are Soulver and Numi. I find them super useful. Using natural language and storing the context along with the calculations helps me to sort of think through problems. Being able to define variables on the fly is also very useful — I often use them for pricing out materials for projects. E.g.: "8ft 4 × 4" = $15 "…

There's a shout out to Soulver in the FAQ https://docs.numpad.io/#did-you-invent-the-notepad-calculato.... It's a great app, but Mac/iOS exclusive, and I think NumPad handles unit calculations a bit better (though I'm biased).
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