You can use Tasker to schedule messages

Pulse can do scheduled messages (haven't used it personally) and has online services for $6/year or $11 lifetime. You can also easily see media sent in a conversation. I just switched from the stock messages app and am loving it so far.

Textto.io can do messaging from the web and is free / ad-supported.

WANT THIS FEATURE

I had been using Textra in the past.. then Do It Later... Unfortunately now, I don't text some things or people because I don't want to wake them. Then I forget later. I am committed to Android Messages now with the web feature. I hope a scheduled SMS/MMS is coming.

I mainly use it to schedule stuff I'm thinking of before bed. I go to bed super late and don't want to be pinging my friends' or family's phones at 4am.

I also send stuff to my brother-in-law often and he goes to bed at like 9 since he works early, so I don't want to wake him up.

I used to send my conservative friend pictures of Obama every day at 6am. I had it scheduled out months in advance. 6 o'clock Barack was good times

I second Signal. It's reccomended by Snowden too

I really like Pulse SMS

I recommend QKSMS.

Fine solid features, good design. And respects privacy (download on f-droid.org).

Textra e.g. has unwanted data trackers in background.

SMS Organizer by Microsoft has many unique features and I found it to be the most useful SMS app.

Signal if you are interested in privacy.

No, but I wish it did!

Nope

I think you can do it with KDE Connect. I've received sms notifications on my laptop, but i haven't tried sending/replying.

You should check out https://github.com/Genymobile/scrcpy Although you need the phone to be connected via cable or network, I think you can still use it to send sms "from your pc"

Something to keep your eye on if you're a Nextcloud user is their Phonesync app. Currently, it only lets you see your sms, but maybe adding the ability to send in a later release.

Are there any that would work while still using RCS on the Google message app?

Textra. Best text message app I've used. It's free with an advert, or a cheap pro upgrade for adfree. I don't remember if there are features locked behind the pro purchase, but scheduled messages are certainly available free.

Tasker if you're technically minded and don't mind creating your own scripts, which is better for truly automated (as opposed to just 'send this at this time').

Pulse SMS

I'm able to do that with my default texting app.

Samsung Galaxy S10

I've scheduled texts using tasker to fire one off when I get within a location range, you could probably do the same with date/time

Such a thing would require an API to be used with those services, or have them all open sourced.

But there aren't any.

So whatever you find will not be working well.

The only similar thing I know of is Drupe, but even then it's nothing compared to what would have been possible...

Try matrix bridges. It's a protocol that can help with all messages in one place.

https://matrix.org/

Used to be (see ebuddy chat) then all Im providers started forcing everyone to use their own app

They may start to come back thanks to the EU https://www.theverge.com/2022/3/24/22995431/european-union-digital-markets-act-imessage-whatsapp-interoperable

Beeeper

Disa can't do WhatsApp anymore though

Better late than never. I still don’t understand why they removed it without waiting for their new design to be ready.

Ironically, they brought it back for Teams for Personal in some half-measure before pulling it again. When I click on Saved in Teams Personal it tells me it will be sunset on 11 September.

If there's a particular SMS app you like that doesn't have sync or backup, you could use Join. It lets you send/receive SMS from any platform and backups up your messages, but you can use whatever SMS client you want.

(It also does many other cross-device things like sending files, mirroring notifications, opening links, typing from your desktop onto your phone, etc. But you can just use the SMS part if you want.)

It's cheaper than a subscription to Pulse, too.

Linkme: Join

Mood Messenger meets all of your criteria except for desktop. I use AirDroid and mighty text for sms on the desktop

Been using Pulse SMS for some time, it works well apart from that I've had some smaller troubles getting contacts to sync directly in the web version, but nothing big.

The front end is also open source and you can find this code on github (and thus actually report issues properly if there are any). Also the dev is nice and actually answered my emails.

Its simple, its clean. Oh, you can also set messages as unread which is nice!

Microsoft sms organizer. Has all the features listed above except for chrome sync

I like pulse but I really didn't know it had a desktop version.

QKSMS or, if you're willing to give up a bit of privacy, you can actually use Facebook Messenger for SMS and it makes your chats conveniently in one place.

Also, why do you want to ditch Google Messages? It's currently the best messaging app on the market and basically no app can compete

I will be messaging you in 10 days on 2023-05-09 19:49:00 UTC to remind you of this link

CLICK THIS LINK to send a PM to also be reminded and to reduce spam.

^(Parent commenter can ) ^(delete this message to hide from others.)

I've been using Textra forever, I try others and go right back to it. Very customizable and never fails me.

Some like QKSMS, or Microsoft's SMS Organizer. You lose RCS (aka Chat) by not using Google Messages, since Google hasn't provided an API that 3rd parties can use.