▲Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing(numpad.io)
36 points by tonyonodi 4 days ago | 8 comments
▲shepik 19 minutes ago
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

▲johncosta27 3 days ago
This is very cool. I was able to so some a small budget to see what my expenses are monthly, it's quite nice. I can see myself using it anytime I need something more than paper, and less than a full spreadsheet. Very cool.
▲eps 9 hours ago
[flagged]
▲jasonjmcghee 9 hours ago
Clearly he likes notepad calculators.
▲kragen 7 hours ago
Was the other one by a different author?
▲zamadatix 4 hours ago
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 trade local for concurrent usage)

▲abfar 7 hours ago
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?
▲bobeboph 6 hours ago
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..."

▲zamadatix 4 hours ago
Maybe the author did intentionally break order of operations for shorthand on other roots, maybe they just forgot that's not how it's normally parsed. 152 doesn't comment on intent one way or the other, it just demonstrates how it currently is.
▲ 5 hours ago
▲kragen 7 hours ago
That's pretty nice; I've made a few attempts at such things myself, but the UI flow seems pretty smooth.

What's the license? I wouldn't want to use your code if copyright law poses a threat.

▲eviks 5 hours ago
Unfortunately doesn't support superscripts 6²

Also is it possible to use CRDT as rich undo history, not only syncing?

▲ajjenkins 7 hours ago
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.
▲wslh 8 hours ago
Looking for other notepad calculators I found odd products like this: https://www.ubuy.com.ar/en/product/IP17JM9X0-calculator-with...