@michaelredmond Mastodon is the open source software that CoSo is based on. It's also the name of a bunch of affiliated sites that all use Mastodon software and integrate with each other (so users on one can read the posts of users on the others), but CoSo is independent and non-affiliated. However, any smartphone app that says it works to access Mastodon will also work to let you use CoSo
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@michaelredmond I think the plan is ultimately to build a CoSo specific smartphone app, but that takes time. In the meantime, the Mastodon ones work nicely! But it looks like Tootdon might have better search features than the one I currently use.