The kbin/lemmy app is coming along. Here´s a little preview of the upcoming beta! Heavy inspiration from Apollo. The app will be available for both iOS and Android.
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The dev, @hariette, also has a Mastodon profile where she posts updates https://tech.lgbt/@hariette. There is also a link to the apps discord server in her bio.
Apollo did have a free tier and then a few paid tiers.
iirc, (I bought it many years ago), they had a one time Pro purchase that removed any ads and unlocked theming and such, and then the Ultimate which was a subscription to cover server costs of push notifications (although it did eventually end up having more features locked behind it).
While I personally did not go for the Ultimate subscription (didn’t really need the push notifications), I gladly paid for the Pro as it was well worth it IMO.